/symm/xsalsa208.h
/symm/stubs.gen-stamp
/symm/t/salsa20
+/symm/xchacha12.h
+/symm/xchacha20.h
+/symm/xchacha8.h
+/symm/chacha12.h
+/symm/chacha20.h
+/symm/chacha8.h
+/symm/xchacha.h
} >t/salsa20.new && \
mv t/salsa20.new t/salsa20
+## Bernstein's `ChaCha' stream cipher.
+pkginclude_HEADERS += chacha.h chacha-core.h
+libsymm_la_SOURCES += chacha.c
+TESTS += chacha.$t
+EXTRA_DIST += t/chacha
+ALL_CIPHERS += chacha20 chacha12 chacha8
+ALL_CIPHERS += xchacha20 xchacha12 xchacha8
+STUBS_HDR += ChaCha20,chacha20,chacha
+STUBS_HDR += ChaCha12,chacha12,chacha
+STUBS_HDR += ChaCha8,chacha8,chacha
+STUBS_HDR += XChaCha20,xchacha20,chacha
+STUBS_HDR += XChaCha12,xchacha12,chacha
+STUBS_HDR += XChaCha8,xchacha8,chacha
+
###--------------------------------------------------------------------------
### Autogenerated mode implementations.
--- /dev/null
+/* -*-c-*-
+ *
+ * ChaCha core definitions
+ *
+ * (c) 2015 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#ifndef CATACOMB_CHACHA_CORE_H
+#define CATACOMB_CHACHA_CORE_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/bits.h>
+#include <mLib/macros.h>
+
+#ifndef CATACOMB_CHACHA_H
+# include "chacha.h"
+#endif
+
+#ifndef CATACOMB_SALSA20_CORE_H
+# include "salsa20-core.h"
+#endif
+
+/*----- Magic constants ---------------------------------------------------*/
+
+/* The magic ChaCha constants are the same as the Salsa20 ones. For 256-bit
+ * keys ...
+ */
+#define CHACHA_A256 SALSA20_A256 /* e x p a */
+#define CHACHA_B256 SALSA20_B256 /* n d 3 */
+#define CHACHA_C256 SALSA20_C256 /* 2 - b y */
+#define CHACHA_D256 SALSA20_D256 /* t e k */
+
+/* ... and for 128-bit keys ... */
+#define CHACHA_A128 SALSA20_A128 /* e x p a */
+#define CHACHA_B128 SALSA20_B128 /* n d 1 */
+#define CHACHA_C128 SALSA20_C128 /* 6 - b y */
+#define CHACHA_D128 SALSA20_D128 /* t e k */
+
+/* ... and for 80-bit keys, for completeness's sake. */
+#define CHACHA_A80 SALSA20_A80 /* e x p a */
+#define CHACHA_B80 SALSA20_B80 /* n d 1 */
+#define CHACHA_C80 SALSA20_C80 /* 0 - b y */
+#define CHACHA_D80 SALSA20_D80 /* t e k */
+
+/*----- The ChaCha core function ------------------------------------------*/
+
+/* The ChaCha quarter round. Read from the matrix @y@ at indices @a@, @b@,
+ * @c@, and @d@; and write to the corresponding elements of @z@.
+ */
+#define CHACHA_QR(z, y, a, b, c, d) do { \
+ (z)[a] = (y)[a] + (y)[b]; (z)[d] = ROL32((y)[d] ^ (z)[a], 16); \
+ (z)[c] = (y)[c] + (z)[d]; (z)[b] = ROL32((y)[b] ^ (z)[c], 12); \
+ (z)[a] = (z)[a] + (z)[b]; (z)[d] = ROL32((z)[d] ^ (z)[a], 8); \
+ (z)[c] = (z)[c] + (z)[d]; (z)[b] = ROL32((z)[b] ^ (z)[c], 7); \
+} while (0)
+
+/* The ChaCha double-round. Read from matrix @y@, writing the result to
+ * @z@.
+ */
+#define CHACHA_DR(z, y) do { \
+ CHACHA_QR(z, y, 0, 4, 8, 12); \
+ CHACHA_QR(z, y, 1, 5, 9, 13); \
+ CHACHA_QR(z, y, 2, 6, 10, 14); \
+ CHACHA_QR(z, y, 3, 7, 11, 15); \
+ CHACHA_QR(z, z, 0, 5, 10, 15); \
+ CHACHA_QR(z, z, 1, 6, 11, 12); \
+ CHACHA_QR(z, z, 2, 7, 8, 13); \
+ CHACHA_QR(z, z, 3, 4, 9, 14); \
+} while (0)
+
+/* The ChaCha feedforward step, used at the end of the core function. Here,
+ * @y@ contains the original input matrix; @z@ contains the final one, and is
+ * updated. This is the same as Salsa20.
+ */
+#define CHACHA_FFWD(z, y) SALSA20_FFWD(z, y)
+
+/* Various numbers of rounds, unrolled. Read from @y@, and write to @z@. */
+#define CHACHA_4R(z, y) \
+ do { CHACHA_DR(z, y); CHACHA_DR(z, z); } while (0)
+#define CHACHA_8R(z, y) \
+ do { CHACHA_4R(z, y); CHACHA_4R(z, z); } while (0)
+#define CHACHA_12R(z, y) \
+ do { CHACHA_8R(z, y); CHACHA_4R(z, z); } while (0)
+#define CHACHA_20R(z, y) \
+ do { CHACHA_12R(z, y); CHACHA_8R(z, z); } while (0)
+
+/* Apply @n@ (must be even) rounds, rolled. (This seems to be faster,
+ * probably because it fits in cache better). Read from @y@, and write to
+ * @z@.
+ */
+#define CHACHA_nR(z, y, n) do { \
+ int _i; \
+ CHACHA_DR(z, y); \
+ for (_i = 0; _i < (n)/2 - 1; _i++) CHACHA_DR(z, z); \
+} while (0)
+
+/* Step the counter in the Chacha state matrix @a@. */
+#define CHACHA_STEP(a) \
+ do { (a)[12] = U32((a)[12] + 1); (a)[13] += !(a)[12]; } while (0)
+
+/*----- Variants and naming -----------------------------------------------*/
+
+/* Common numbers of rounds, for which we generate definitions. */
+#define CHACHA_VARS(_) _(8) _(12) _(20)
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
--- /dev/null
+/* -*-c-*-
+ *
+ * ChaCha stream cipher
+ *
+ * (c) 2015 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stdarg.h>
+
+#include <mLib/bits.h>
+
+#include "arena.h"
+#include "chacha.h"
+#include "chacha-core.h"
+#include "gcipher.h"
+#include "grand.h"
+#include "keysz.h"
+#include "paranoia.h"
+
+/*----- Global variables --------------------------------------------------*/
+
+const octet chacha_keysz[] = { KSZ_SET, 32, 16, 10, 0 };
+
+/*----- The ChaCha core function and utilities ----------------------------*/
+
+/* --- @core@ --- *
+ *
+ * Arguments: @unsigned r@ = number of rounds
+ * @const chacha_matrix src@ = input matrix
+ * @chacha_matrix dest@ = where to put the output
+ *
+ * Returns: ---
+ *
+ *
+ * Use: Apply the ChaCha/r core function to @src@, writing the
+ * result to @dest@. This consists of @r@ rounds followed by
+ * the feedforward step.
+ */
+
+static void core(unsigned r, const chacha_matrix src, chacha_matrix dest)
+ { CHACHA_nR(dest, src, r); CHACHA_FFWD(dest, src); }
+
+/* --- @populate@ --- *
+ *
+ * Arguments: @chacha_matrix a@ = a matrix to fill in
+ * @const void *key@ = pointer to key material
+ * @size_t ksz@ = size of key
+ *
+ * Returns: ---
+ *
+ * Use: Fills in a ChaCha matrix from the key, setting the
+ * appropriate constants according to the key length. The nonce
+ * and position words are left uninitialized.
+ */
+
+static void populate(chacha_matrix a, const void *key, size_t ksz)
+{
+ const octet *k = key;
+
+ KSZ_ASSERT(chacha, ksz);
+
+ a[ 4] = LOAD32_L(k + 0);
+ a[ 5] = LOAD32_L(k + 4);
+ if (ksz == 10) {
+ a[ 6] = LOAD16_L(k + 8);
+ a[ 7] = 0;
+ } else {
+ a[ 6] = LOAD32_L(k + 8);
+ a[ 7] = LOAD32_L(k + 12);
+ }
+ if (ksz <= 16) {
+ a[ 8] = a[ 4];
+ a[ 9] = a[ 5];
+ a[10] = a[ 6];
+ a[11] = a[ 7];
+ a[ 0] = CHACHA_A128;
+ a[ 1] = CHACHA_B128;
+ a[ 2] = ksz == 10 ? CHACHA_C80 : CHACHA_C128;
+ a[ 3] = CHACHA_D128;
+ } else {
+ a[ 8] = LOAD32_L(k + 16);
+ a[ 9] = LOAD32_L(k + 20);
+ a[10] = LOAD32_L(k + 24);
+ a[11] = LOAD32_L(k + 28);
+ a[ 0] = CHACHA_A256;
+ a[ 1] = CHACHA_B256;
+ a[ 2] = CHACHA_C256;
+ a[ 3] = CHACHA_D256;
+ }
+}
+
+/*----- ChaCha implementation ---------------------------------------------*/
+
+/* --- @chacha_init@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = context to fill in
+ * @const void *key@ = pointer to key material
+ * @size_t ksz@ = size of key (either 32 or 16)
+ * @const void *nonce@ = initial nonce, or null
+ *
+ * Returns: ---
+ *
+ * Use: Initializes a ChaCha context ready for use.
+ */
+
+void chacha_init(chacha_ctx *ctx, const void *key, size_t ksz,
+ const void *nonce)
+{
+ static const octet zerononce[CHACHA_NONCESZ];
+
+ populate(ctx->a, key, ksz);
+ chacha_setnonce(ctx, nonce ? nonce : zerononce);
+}
+
+/* --- @chacha_setnonce@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ * @const void *nonce@ = the nonce (@CHACHA_NONCESZ@ bytes)
+ *
+ * Returns: ---
+ *
+ * Use: Set a new nonce in the context @ctx@, e.g., for processing a
+ * different message. The stream position is reset to zero (see
+ * @chacha_seek@ etc.).
+ */
+
+void chacha_setnonce(chacha_ctx *ctx, const void *nonce)
+{
+ const octet *n = nonce;
+
+ ctx->a[14] = LOAD32_L(n + 0);
+ ctx->a[15] = LOAD32_L(n + 4);
+ chacha_seek(ctx, 0);
+}
+
+/* --- @chacha_seek@, @chacha_seeku64@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ * @unsigned long i@, @kludge64 i@ = new position to set
+ *
+ * Returns: ---
+ *
+ * Use: Sets a new stream position, in units of Chacha output
+ * blocks, which are @CHACHA_OUTSZ@ bytes each. Byte
+ * granularity can be achieved by calling @chachaR_encrypt@
+ * appropriately.
+ */
+
+void chacha_seek(chacha_ctx *ctx, unsigned long i)
+ { kludge64 ii; ASSIGN64(ii, i); chacha_seeku64(ctx, ii); }
+
+void chacha_seeku64(chacha_ctx *ctx, kludge64 i)
+{
+ ctx->a[12] = LO64(i); ctx->a[13] = HI64(i);
+ ctx->bufi = CHACHA_OUTSZ;
+}
+
+/* --- @chacha_tell@, @chacha_tellu64@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ *
+ * Returns: The current position in the output stream, in blocks,
+ * rounding upwards.
+ */
+
+unsigned long chacha_tell(chacha_ctx *ctx)
+ { kludge64 i = chacha_tellu64(ctx); return (GET64(unsigned long, i)); }
+
+kludge64 chacha_tellu64(chacha_ctx *ctx)
+ { kludge64 i; SET64(i, ctx->a[9], ctx->a[8]); return (i); }
+
+/* --- @chacha{,12,8}_encrypt@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ * @const void *src@ = source buffer (or null)
+ * @void *dest@ = destination buffer (or null)
+ * @size_t sz@ = size of the buffers
+ *
+ * Returns: ---
+ *
+ * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
+ * ChaCha works by XORing plaintext with a keystream, so
+ * encryption and decryption are the same operation. If @dest@
+ * is null then ignore @src@ and skip @sz@ bytes of the
+ * keystream. If @src@ is null, then just write the keystream
+ * to @dest@.
+ */
+
+#define CHACHA_ENCRYPT(r, ctx, src, dest, sz) \
+ chacha##r##_encrypt(ctx, src, dest, sz)
+#define DEFENCRYPT(r) \
+ void CHACHA_ENCRYPT(r, chacha_ctx *ctx, const void *src, \
+ void *dest, size_t sz) \
+ { \
+ chacha_matrix b; \
+ const octet *s = src; \
+ octet *d = dest; \
+ size_t n; \
+ kludge64 pos, delta; \
+ \
+ SALSA20_OUTBUF(ctx, d, s, sz); \
+ if (!sz) return; \
+ \
+ if (!dest) { \
+ n = sz/CHACHA_OUTSZ; \
+ pos = chacha_tellu64(ctx); \
+ ASSIGN64(delta, n); \
+ ADD64(pos, pos, delta); \
+ chacha_seeku64(ctx, pos); \
+ sz = sz%CHACHA_OUTSZ; \
+ } else if (!src) { \
+ while (sz >= CHACHA_OUTSZ) { \
+ core(r, ctx->a, b); \
+ CHACHA_STEP(ctx->a); \
+ SALSA20_GENFULL(b, d); \
+ sz -= CHACHA_OUTSZ; \
+ } \
+ } else { \
+ while (sz >= CHACHA_OUTSZ) { \
+ core(r, ctx->a, b); \
+ CHACHA_STEP(ctx->a); \
+ SALSA20_MIXFULL(b, d, s); \
+ sz -= CHACHA_OUTSZ; \
+ } \
+ } \
+ \
+ if (sz) { \
+ core(r, ctx->a, b); \
+ CHACHA_STEP(ctx->a); \
+ SALSA20_PREPBUF(ctx, b); \
+ SALSA20_OUTBUF(ctx, d, s, sz); \
+ assert(!sz); \
+ } \
+ }
+CHACHA_VARS(DEFENCRYPT)
+
+/*----- HChaCha implementation --------------------------------------------*/
+
+#define HCHACHA_RAW(r, ctx, src, dest) hchacha##r##_raw(ctx, src, dest)
+#define HCHACHA_PRF(r, ctx, src, dest) hchacha##r##_prf(ctx, src, dest)
+
+/* --- @hchacha{20,12,8}_prf@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ * @const void *src@ = the input (@HCHACHA_INSZ@ bytes)
+ * @void *dest@ = the output (@HCHACHA_OUTSZ@ bytes)
+ *
+ * Returns: ---
+ *
+ * Use: Apply the HChacha/r pseudorandom function to @src@, writing
+ * the result to @out@.
+ */
+
+#define DEFHCHACHA(r) \
+ static void HCHACHA_RAW(r, chacha_matrix k, \
+ const uint32 *src, uint32 *dest) \
+ { \
+ chacha_matrix a; \
+ int i; \
+ \
+ /* --- HChaCha, computed from full ChaCha --- * \
+ * \
+ * The security proof makes use of the fact that HChaCha (i.e., \
+ * without the final feedforward step) can be computed from full \
+ * ChaCha using only knowledge of the non-secret input. I don't \
+ * want to compromise the performance of the main function by \
+ * making the feedforward step separate, but this operation is less \
+ * speed critical, so we do it the harder way. \
+ */ \
+ \
+ for (i = 0; i < 4; i++) k[12 + i] = src[i]; \
+ core(r, k, a); \
+ for (i = 0; i < 8; i++) dest[i] = a[(i + 4)^4] - k[(i + 4)^4]; \
+ } \
+ \
+ void HCHACHA_PRF(r, chacha_ctx *ctx, const void *src, void *dest) \
+ { \
+ const octet *s = src; \
+ octet *d = dest; \
+ uint32 in[4], out[8]; \
+ int i; \
+ \
+ for (i = 0; i < 4; i++) in[i] = LOAD32_L(s + 4*i); \
+ HCHACHA_RAW(r, ctx->a, in, out); \
+ for (i = 0; i < 8; i++) STORE32_L(d + 4*i, out[i]); \
+ }
+CHACHA_VARS(DEFHCHACHA)
+
+/*----- XChaCha implementation -------------------------------------------*/
+
+/* --- Some convenient macros for naming functions --- *
+ *
+ * Because the crypto core is involved in XChaCha/r's per-nonce setup, we
+ * need to take an interest in the number of rounds in most of the various
+ * functions, and it will probably help if we distinguish the context
+ * structures for the various versions.
+ */
+
+#define XCHACHA_CTX(r) xchacha##r##_ctx
+#define XCHACHA_INIT(r, ctx, k, ksz, n) xchacha##r##_init(ctx, k, ksz, n)
+#define XCHACHA_SETNONCE(r, ctx, n) xchacha##r##_setnonce(ctx, n)
+#define XCHACHA_SEEK(r, ctx, i) xchacha##r##_seek(ctx, i)
+#define XCHACHA_SEEKU64(r, ctx, i) xchacha##r##_seeku64(ctx, i)
+#define XCHACHA_TELL(r, ctx) xchacha##r##_tell(ctx)
+#define XCHACHA_TELLU64(r, ctx) xchacha##r##_tellu64(ctx)
+#define XCHACHA_ENCRYPT(r, ctx, src, dest, sz) \
+ xchacha##r##_encrypt(ctx, src, dest, sz)
+
+/* --- @xchacha{20,12,8}_init@ --- *
+ *
+ * Arguments: @xchachaR_ctx *ctx@ = the context to fill in
+ * @const void *key@ = pointer to key material
+ * @size_t ksz@ = size of key (either 32 or 16)
+ * @const void *nonce@ = initial nonce, or null
+ *
+ * Returns: ---
+ *
+ * Use: Initializes an XChaCha/r context ready for use.
+ *
+ * There is a different function for each number of rounds,
+ * unlike for plain ChaCha.
+ */
+
+#define DEFXINIT(r) \
+ void XCHACHA_INIT(r, XCHACHA_CTX(r) *ctx, \
+ const void *key, size_t ksz, const void *nonce) \
+ { \
+ static const octet zerononce[XCHACHA_NONCESZ]; \
+ \
+ populate(ctx->k, key, ksz); \
+ ctx->s.a[ 0] = CHACHA_A256; \
+ ctx->s.a[ 1] = CHACHA_B256; \
+ ctx->s.a[ 2] = CHACHA_C256; \
+ ctx->s.a[ 3] = CHACHA_D256; \
+ XCHACHA_SETNONCE(r, ctx, nonce ? nonce : zerononce); \
+ }
+CHACHA_VARS(DEFXINIT)
+
+/* --- @xchacha{20,12,8}_setnonce@ --- *
+ *
+ * Arguments: @xchachaR_ctx *ctx@ = pointer to context
+ * @const void *nonce@ = the nonce (@XCHACHA_NONCESZ@ bytes)
+ *
+ * Returns: ---
+ *
+ * Use: Set a new nonce in the context @ctx@, e.g., for processing a
+ * different message. The stream position is reset to zero (see
+ * @chacha_seek@ etc.).
+ *
+ * There is a different function for each number of rounds,
+ * unlike for plain ChaCha.
+ */
+
+#define DEFXNONCE(r) \
+ void XCHACHA_SETNONCE(r, XCHACHA_CTX(r) *ctx, const void *nonce) \
+ { \
+ const octet *n = nonce; \
+ uint32 in[4]; \
+ int i; \
+ \
+ for (i = 0; i < 4; i++) in[i] = LOAD32_L(n + 4*i); \
+ HCHACHA_RAW(r, ctx->k, in, ctx->s.a + 4); \
+ chacha_setnonce(&ctx->s, n + 16); \
+ }
+CHACHA_VARS(DEFXNONCE)
+
+/* --- @xchacha{20,12,8}_seek@, @xchacha{20,12,8}_seeku64@ --- *
+ *
+ * Arguments: @xchachaR_ctx *ctx@ = pointer to context
+ * @unsigned long i@, @kludge64 i@ = new position to set
+ *
+ * Returns: ---
+ *
+ * Use: Sets a new stream position, in units of ChaCha output
+ * blocks, which are @XCHACHA_OUTSZ@ bytes each. Byte
+ * granularity can be achieved by calling @xchachaR_encrypt@
+ * appropriately.
+ *
+ * There is a different function for each number of rounds,
+ * unlike for plain ChaCha, because the context structures are
+ * different.
+ */
+
+/* --- @xchacha{20,12,8}_tell@, @xchacha{20,12,8}_tellu64@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ *
+ * Returns: The current position in the output stream, in blocks,
+ * rounding upwards.
+ *
+ * There is a different function for each number of rounds,
+ * unlike for plain ChaCha, because the context structures are
+ * different.
+ */
+
+/* --- @xchacha{,12,8}_encrypt@ --- *
+ *
+ * Arguments: @xchachaR_ctx *ctx@ = pointer to context
+ * @const void *src@ = source buffer (or null)
+ * @void *dest@ = destination buffer (or null)
+ * @size_t sz@ = size of the buffers
+ *
+ * Returns: ---
+ *
+ * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
+ * XChaCha works by XORing plaintext with a keystream, so
+ * encryption and decryption are the same operation. If @dest@
+ * is null then ignore @src@ and skip @sz@ bytes of the
+ * keystream. If @src@ is null, then just write the keystream
+ * to @dest@.
+ */
+
+#define DEFXPASSTHRU(r) \
+ void XCHACHA_SEEK(r, XCHACHA_CTX(r) *ctx, unsigned long i) \
+ { chacha_seek(&ctx->s, i); } \
+ void XCHACHA_SEEKU64(r, XCHACHA_CTX(r) *ctx, kludge64 i) \
+ { chacha_seeku64(&ctx->s, i); } \
+ unsigned long XCHACHA_TELL(r, XCHACHA_CTX(r) *ctx) \
+ { return chacha_tell(&ctx->s); } \
+ kludge64 XCHACHA_TELLU64(r, XCHACHA_CTX(r) *ctx) \
+ { return chacha_tellu64(&ctx->s); } \
+ void XCHACHA_ENCRYPT(r, XCHACHA_CTX(r) *ctx, \
+ const void *src, void *dest, size_t sz) \
+ { CHACHA_ENCRYPT(r, &ctx->s, src, dest, sz); }
+CHACHA_VARS(DEFXPASSTHRU)
+
+/*----- Generic cipher interface ------------------------------------------*/
+
+typedef struct gctx { gcipher c; chacha_ctx ctx; } gctx;
+
+static void gsetiv(gcipher *c, const void *iv)
+ { gctx *g = (gctx *)c; chacha_setnonce(&g->ctx, iv); }
+
+static void gdestroy(gcipher *c)
+ { gctx *g = (gctx *)c; BURN(*g); S_DESTROY(g); }
+
+#define DEFGCIPHER(r) \
+ \
+ static const gcipher_ops gops_##r; \
+ \
+ static gcipher *ginit_##r(const void *k, size_t sz) \
+ { \
+ gctx *g = S_CREATE(gctx); \
+ g->c.ops = &gops_##r; \
+ chacha_init(&g->ctx, k, sz, 0); \
+ return (&g->c); \
+ } \
+ \
+ static void gencrypt_##r(gcipher *c, const void *s, \
+ void *t, size_t sz) \
+ { gctx *g = (gctx *)c; CHACHA_ENCRYPT(r, &g->ctx, s, t, sz); } \
+ \
+ static const gcipher_ops gops_##r = { \
+ &chacha##r, \
+ gencrypt_##r, gencrypt_##r, gdestroy, gsetiv, 0 \
+ }; \
+ \
+ const gccipher chacha##r = { \
+ "chacha" #r, chacha_keysz, \
+ CHACHA_NONCESZ, ginit_##r \
+ };
+
+CHACHA_VARS(DEFGCIPHER)
+
+#define DEFGXCIPHER(r) \
+ \
+ typedef struct { gcipher c; XCHACHA_CTX(r) ctx; } gxctx_##r; \
+ \
+ static void gxsetiv_##r(gcipher *c, const void *iv) \
+ { gxctx_##r *g = (gxctx_##r *)c; XCHACHA_SETNONCE(r, &g->ctx, iv); } \
+ \
+ static void gxdestroy_##r(gcipher *c) \
+ { gxctx_##r *g = (gxctx_##r *)c; BURN(*g); S_DESTROY(g); } \
+ \
+ static const gcipher_ops gxops_##r; \
+ \
+ static gcipher *gxinit_##r(const void *k, size_t sz) \
+ { \
+ gxctx_##r *g = S_CREATE(gxctx_##r); \
+ g->c.ops = &gxops_##r; \
+ XCHACHA_INIT(r, &g->ctx, k, sz, 0); \
+ return (&g->c); \
+ } \
+ \
+ static void gxencrypt_##r(gcipher *c, const void *s, \
+ void *t, size_t sz) \
+ { \
+ gxctx_##r *g = (gxctx_##r *)c; \
+ XCHACHA_ENCRYPT(r, &g->ctx, s, t, sz); \
+ } \
+ \
+ static const gcipher_ops gxops_##r = { \
+ &xchacha##r, \
+ gxencrypt_##r, gxencrypt_##r, gxdestroy_##r, gxsetiv_##r, 0 \
+ }; \
+ \
+ const gccipher xchacha##r = { \
+ "xchacha" #r, chacha_keysz, \
+ CHACHA_NONCESZ, gxinit_##r \
+ };
+
+CHACHA_VARS(DEFGXCIPHER)
+
+/*----- Generic random number generator interface -------------------------*/
+
+typedef struct grops {
+ size_t noncesz;
+ void (*seek)(void *, kludge64);
+ kludge64 (*tell)(void *);
+ void (*setnonce)(void *, const void *);
+ void (*generate)(void *, void *, size_t);
+} grops;
+
+typedef struct grbasectx {
+ grand r;
+ const grops *ops;
+} grbasectx;
+
+static int grmisc(grand *r, unsigned op, ...)
+{
+ octet buf[XCHACHA_NONCESZ];
+ grbasectx *g = (grbasectx *)r;
+ grand *rr;
+ const octet *p;
+ size_t sz;
+ uint32 i;
+ unsigned long ul;
+ kludge64 pos;
+ va_list ap;
+ int rc = 0;
+
+ va_start(ap, op);
+
+ switch (op) {
+ case GRAND_CHECK:
+ switch (va_arg(ap, unsigned)) {
+ case GRAND_CHECK:
+ case GRAND_SEEDINT:
+ case GRAND_SEEDUINT32:
+ case GRAND_SEEDBLOCK:
+ case GRAND_SEEDRAND:
+ case CHACHA_SEEK:
+ case CHACHA_SEEKU64:
+ case CHACHA_TELL:
+ case CHACHA_TELLU64:
+ rc = 1;
+ break;
+ default:
+ rc = 0;
+ break;
+ }
+ break;
+
+ case GRAND_SEEDINT:
+ i = va_arg(ap, unsigned); STORE32_L(buf, i);
+ memset(buf + 4, 0, g->ops->noncesz - 4);
+ g->ops->setnonce(g, buf);
+ break;
+ case GRAND_SEEDUINT32:
+ i = va_arg(ap, uint32); STORE32_L(buf, i);
+ memset(buf + 4, 0, g->ops->noncesz - 4);
+ g->ops->setnonce(g, buf);
+ break;
+ case GRAND_SEEDBLOCK:
+ p = va_arg(ap, const void *);
+ sz = va_arg(ap, size_t);
+ if (sz < g->ops->noncesz) {
+ memcpy(buf, p, sz);
+ memset(buf + sz, 0, g->ops->noncesz - sz);
+ p = buf;
+ }
+ g->ops->setnonce(g, p);
+ break;
+ case GRAND_SEEDRAND:
+ rr = va_arg(ap, grand *);
+ rr->ops->fill(rr, buf, g->ops->noncesz);
+ g->ops->setnonce(g, buf);
+ break;
+ case CHACHA_SEEK:
+ ul = va_arg(ap, unsigned long); ASSIGN64(pos, ul);
+ g->ops->seek(g, pos);
+ break;
+ case CHACHA_SEEKU64:
+ pos = va_arg(ap, kludge64);
+ g->ops->seek(g, pos);
+ break;
+ case CHACHA_TELL:
+ pos = g->ops->tell(g);
+ *va_arg(ap, unsigned long *) = GET64(unsigned long, pos);
+ break;
+ case CHACHA_TELLU64:
+ *va_arg(ap, kludge64 *) = g->ops->tell(g);
+ break;
+ default:
+ GRAND_BADOP;
+ break;
+ }
+
+ return (rc);
+}
+
+static octet grbyte(grand *r)
+{
+ grbasectx *g = (grbasectx *)r;
+ octet o;
+ g->ops->generate(g, &o, 1);
+ return (o);
+}
+
+static uint32 grword(grand *r)
+{
+ grbasectx *g = (grbasectx *)r;
+ octet b[4];
+ g->ops->generate(g, b, sizeof(b));
+ return (LOAD32_L(b));
+}
+
+static void grfill(grand *r, void *p, size_t sz)
+{
+ grbasectx *g = (grbasectx *)r;
+ g->ops->generate(r, p, sz);
+}
+
+typedef struct grctx {
+ grbasectx r;
+ chacha_ctx ctx;
+} grctx;
+
+static void gr_seek(void *r, kludge64 pos)
+ { grctx *g = r; chacha_seeku64(&g->ctx, pos); }
+
+static kludge64 gr_tell(void *r)
+ { grctx *g = r; return (chacha_tellu64(&g->ctx)); }
+
+static void gr_setnonce(void *r, const void *n)
+ { grctx *g = r; chacha_setnonce(&g->ctx, n); }
+
+static void grdestroy(grand *r)
+ { grctx *g = (grctx *)r; BURN(*g); S_DESTROY(g); }
+
+#define DEFGRAND(rr) \
+ \
+ static void gr_generate_##rr(void *r, void *b, size_t sz) \
+ { grctx *g = r; CHACHA_ENCRYPT(rr, &g->ctx, 0, b, sz); } \
+ \
+ static const grops grops_##rr = \
+ { CHACHA_NONCESZ, gr_seek, gr_tell, \
+ gr_setnonce, gr_generate_##rr }; \
+ \
+ static const grand_ops grops_rand_##rr = { \
+ "chacha" #rr, GRAND_CRYPTO, 0, \
+ grmisc, grdestroy, grword, \
+ grbyte, grword, grand_range, grfill \
+ }; \
+ \
+ grand *chacha##rr##_rand(const void *k, size_t ksz, const void *n) \
+ { \
+ grctx *g = S_CREATE(g); \
+ g->r.r.ops = &grops_rand_##rr; \
+ g->r.ops = &grops_##rr; \
+ chacha_init(&g->ctx, k, ksz, n); \
+ return (&g->r.r); \
+ }
+CHACHA_VARS(DEFGRAND)
+
+#define DEFXGRAND(rr) \
+ \
+ typedef struct grxctx_##rr { \
+ grbasectx r; \
+ XCHACHA_CTX(rr) ctx; \
+ } grxctx_##rr; \
+ \
+ static void grx_seek_##rr(void *r, kludge64 pos) \
+ { grxctx_##rr *g = r; XCHACHA_SEEKU64(rr, &g->ctx, pos); } \
+ \
+ static kludge64 grx_tell_##rr(void *r) \
+ { grxctx_##rr *g = r; return (XCHACHA_TELLU64(rr, &g->ctx)); } \
+ \
+ static void grx_setnonce_##rr(void *r, const void *n) \
+ { grxctx_##rr *g = r; XCHACHA_SETNONCE(rr, &g->ctx, n); } \
+ \
+ static void grxdestroy_##rr(grand *r) \
+ { grxctx_##rr *g = (grxctx_##rr *)r; BURN(*g); S_DESTROY(g); } \
+ \
+ static void grx_generate_##rr(void *r, void *b, size_t sz) \
+ { grxctx_##rr *g = r; XCHACHA_ENCRYPT(rr, &g->ctx, 0, b, sz); } \
+ \
+ static const grops grxops_##rr = \
+ { XCHACHA_NONCESZ, grx_seek_##rr, grx_tell_##rr, \
+ grx_setnonce_##rr, grx_generate_##rr }; \
+ \
+ static const grand_ops grxops_rand_##rr = { \
+ "xchacha" #rr, GRAND_CRYPTO, 0, \
+ grmisc, grxdestroy_##rr, grword, \
+ grbyte, grword, grand_range, grfill \
+ }; \
+ \
+ grand *xchacha##rr##_rand(const void *k, size_t ksz, const void *n) \
+ { \
+ grxctx_##rr *g = S_CREATE(g); \
+ g->r.r.ops = &grxops_rand_##rr; \
+ g->r.ops = &grxops_##rr; \
+ XCHACHA_INIT(rr, &g->ctx, k, ksz, n); \
+ return (&g->r.r); \
+ }
+CHACHA_VARS(DEFXGRAND)
+
+/*----- Test rig ----------------------------------------------------------*/
+
+#ifdef TEST_RIG
+
+#include <stdio.h>
+#include <string.h>
+
+#include <mLib/quis.h>
+#include <mLib/testrig.h>
+
+#define DEFVCORE(r) \
+ static int v_core_##r(dstr *v) \
+ { \
+ chacha_matrix a, b; \
+ dstr d = DSTR_INIT; \
+ int i, n; \
+ int ok = 1; \
+ \
+ DENSURE(&d, CHACHA_OUTSZ); d.len = CHACHA_OUTSZ; \
+ n = *(int *)v[0].buf; \
+ for (i = 0; i < CHACHA_OUTSZ/4; i++) \
+ a[i] = LOAD32_L(v[1].buf + 4*i); \
+ for (i = 0; i < n; i++) { \
+ core(r, a, b); \
+ memcpy(a, b, sizeof(a)); \
+ } \
+ for (i = 0; i < CHACHA_OUTSZ/4; i++) STORE32_L(d.buf + 4*i, a[i]); \
+ \
+ if (d.len != v[2].len || memcmp(d.buf, v[2].buf, v[2].len) != 0) { \
+ ok = 0; \
+ printf("\nfail core:" \
+ "\n\titerations = %d" \
+ "\n\tin = ", n); \
+ type_hex.dump(&v[1], stdout); \
+ printf("\n\texpected = "); \
+ type_hex.dump(&v[2], stdout); \
+ printf("\n\tcalculated = "); \
+ type_hex.dump(&d, stdout); \
+ putchar('\n'); \
+ } \
+ \
+ dstr_destroy(&d); \
+ return (ok); \
+ }
+CHACHA_VARS(DEFVCORE)
+
+#define CHACHA_CTX(r) chacha_ctx
+#define CHACHA_INIT(r, ctx, k, ksz, n) chacha_init(ctx, k, ksz, n)
+#define CHACHA_SEEKU64(r, ctx, i) chacha_seeku64(ctx, i)
+#define XCHACHA_SEEKU64(r, ctx, i) xchacha##r##_seeku64(ctx, i)
+
+#define DEFxVENC(base, BASE, r) \
+ static int v_encrypt_##base##_##r(dstr *v) \
+ { \
+ BASE##_CTX(r) ctx; \
+ dstr d = DSTR_INIT; \
+ kludge64 pos; \
+ const octet *p, *p0; \
+ octet *q; \
+ size_t sz, sz0, step; \
+ unsigned long skip; \
+ int ok = 1; \
+ \
+ if (v[4].len) { p0 = (const octet *)v[4].buf; sz0 = v[4].len; } \
+ else { p0 = 0; sz0 = v[5].len; } \
+ DENSURE(&d, sz0); d.len = sz0; \
+ skip = *(unsigned long *)v[3].buf; \
+ \
+ step = 0; \
+ while (step < sz0 + skip) { \
+ step = step ? 3*step + 4 : 1; \
+ if (step > sz0 + skip) step = sz0 + skip; \
+ BASE##_INIT(r, &ctx, v[0].buf, v[0].len, v[1].buf); \
+ if (v[2].len) { \
+ LOAD64_(pos, v[2].buf); \
+ BASE##_SEEKU64(r, &ctx, pos); \
+ } \
+ \
+ for (sz = skip; sz >= step; sz -= step) \
+ BASE##_ENCRYPT(r, &ctx, 0, 0, step); \
+ if (sz) BASE##_ENCRYPT(r, &ctx, 0, 0, sz); \
+ for (p = p0, q = (octet *)d.buf, sz = sz0; \
+ sz >= step; \
+ sz -= step, q += step) { \
+ BASE##_ENCRYPT(r, &ctx, p, q, step); \
+ if (p) p += step; \
+ } \
+ if (sz) BASE##_ENCRYPT(r, &ctx, p, q, sz); \
+ \
+ if (d.len != v[5].len || memcmp(d.buf, v[5].buf, v[5].len) != 0) { \
+ ok = 0; \
+ printf("\nfail encrypt:" \
+ "\n\tstep = %lu" \
+ "\n\tkey = ", (unsigned long)step); \
+ type_hex.dump(&v[0], stdout); \
+ printf("\n\tnonce = "); \
+ type_hex.dump(&v[1], stdout); \
+ printf("\n\tposition = "); \
+ type_hex.dump(&v[2], stdout); \
+ printf("\n\tskip = %lu", skip); \
+ printf("\n\tmessage = "); \
+ type_hex.dump(&v[4], stdout); \
+ printf("\n\texpected = "); \
+ type_hex.dump(&v[5], stdout); \
+ printf("\n\tcalculated = "); \
+ type_hex.dump(&d, stdout); \
+ putchar('\n'); \
+ } \
+ } \
+ \
+ dstr_destroy(&d); \
+ return (ok); \
+ }
+#define DEFVENC(r) DEFxVENC(chacha, CHACHA, r)
+#define DEFXVENC(r) DEFxVENC(xchacha, XCHACHA, r)
+CHACHA_VARS(DEFVENC)
+CHACHA_VARS(DEFXVENC)
+
+static test_chunk defs[] = {
+#define DEFxTAB(base, r) \
+ { #base #r, v_encrypt_##base##_##r, \
+ { &type_hex, &type_hex, &type_hex, &type_ulong, \
+ &type_hex, &type_hex, 0 } },
+#define DEFTAB(r) \
+ { "chacha" #r "-core", v_core_##r, \
+ { &type_int, &type_hex, &type_hex, 0 } }, \
+ DEFxTAB(chacha, r)
+#define DEFXTAB(r) DEFxTAB(xchacha, r)
+CHACHA_VARS(DEFTAB)
+CHACHA_VARS(DEFXTAB)
+ { 0, 0, { 0 } }
+};
+
+int main(int argc, char *argv[])
+{
+ test_run(argc, argv, defs, SRCDIR"/t/chacha");
+ return (0);
+}
+
+#endif
+
+/*----- That's all, folks -------------------------------------------------*/
--- /dev/null
+/* -*-c-*-
+ *
+ * ChaCha stream cipher
+ *
+ * (c) 2015 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#ifndef CATACOMB_CHACHA_H
+#define CATACOMB_CHACHA_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/bits.h>
+
+#ifndef CATACOMB_GCIPHER_H
+# include "gcipher.h"
+#endif
+
+#ifndef CATACOMB_GRAND_H
+# include "grand.h"
+#endif
+
+/*----- Constants ---------------------------------------------------------*/
+
+#define CHACHA_NONCESZ 8u
+#define CHACHA_KEYSZ 32u
+#define CHACHA_OUTSZ 64u
+
+#define HCHACHA_INSZ 16u
+#define HCHACHA_OUTSZ 32u
+
+#define XCHACHA_NONCESZ 24u
+#define XCHACHA_KEYSZ CHACHA_KEYSZ
+#define XCHACHA_OUTSZ CHACHA_OUTSZ
+
+/*----- Data structures ---------------------------------------------------*/
+
+typedef uint32 chacha_matrix[16];
+
+typedef struct chacha_ctx {
+ chacha_matrix a;
+ octet buf[CHACHA_OUTSZ];
+ size_t bufi;
+} chacha_ctx;
+
+#define XCHACHA_DEFCTX(name) \
+ typedef struct name { chacha_ctx s; chacha_matrix k; } name
+XCHACHA_DEFCTX(xchacha20_ctx);
+XCHACHA_DEFCTX(xchacha12_ctx);
+XCHACHA_DEFCTX(xchacha8_ctx);
+
+/*----- The ChaCha stream cipher ------------------------------------------*/
+
+/* --- @chacha_init@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = context to fill in
+ * @const void *key@ = pointer to key material
+ * @size_t ksz@ = size of key (either 32 or 16)
+ * @const void *nonce@ = initial nonce, or null
+ *
+ * Returns: ---
+ *
+ * Use: Initializes a ChaCha context ready for use.
+ */
+
+extern void chacha_init(chacha_ctx */*ctx*/,
+ const void */*key*/, size_t /*ksz*/,
+ const void */*nonce*/);
+
+/* --- @chacha_setnonce@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ * @const void *nonce@ = the nonce (@CHACHA_NONCESZ@ bytes)
+ *
+ * Returns: ---
+ *
+ * Use: Set a new nonce in the context @ctx@, e.g., for processing a
+ * different message. The stream position is reset to zero (see
+ * @chacha_seek@ etc.).
+ */
+
+extern void chacha_setnonce(chacha_ctx */*ctx*/, const void */*nonce*/);
+
+/* --- @chacha_seek@, @chacha_seeku64@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ * @unsigned long i@, @kludge64 i@ = new position to set
+ *
+ * Returns: ---
+ *
+ * Use: Sets a new stream position, in units of ChaCha output
+ * blocks, which are @CHACHA_OUTSZ@ bytes each. Byte
+ * granularity can be achieved by calling @chacha_encrypt@
+ * appropriately.
+ */
+
+extern void chacha_seek(chacha_ctx */*ctx*/, unsigned long /*i*/);
+extern void chacha_seeku64(chacha_ctx */*ctx*/, kludge64 /*i*/);
+
+/* --- @chacha_tell@, @chacha_tellu64@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ *
+ * Returns: The current position in the output stream, in blocks,
+ * rounding upwards.
+ */
+
+extern unsigned long chacha_tell(chacha_ctx */*ctx*/);
+extern kludge64 chacha_tellu64(chacha_ctx */*ctx*/);
+
+/* --- @chacha{20,12,8}_encrypt@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ * @const void *src@ = source buffer (or null)
+ * @void *dest@ = destination buffer (or null)
+ * @size_t sz@ = size of the buffers
+ *
+ * Returns: ---
+ *
+ * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
+ * ChaCha works by XORing plaintext with a keystream, so
+ * encryption and decryption are the same operation. If @dest@
+ * is null then ignore @src@ and skip @sz@ bytes of the
+ * keystream. If @src@ is null, then just write the keystream
+ * to @dest@.
+ */
+
+extern void chacha20_encrypt(chacha_ctx */*ctx*/,
+ const void */*src*/, void */*dest*/,
+ size_t /*sz*/);
+extern void chacha12_encrypt(chacha_ctx */*ctx*/,
+ const void */*src*/, void */*dest*/,
+ size_t /*sz*/);
+extern void chacha8_encrypt(chacha_ctx */*ctx*/,
+ const void */*src*/, void */*dest*/,
+ size_t /*sz*/);
+
+/*----- The HChaCha pseudorandom function ---------------------------------*/
+
+/* --- @hchacha{20,12,8}_prf@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ * @const void *src@ = the input (@HCHACHA_INSZ@ bytes)
+ * @void *dest@ = the output (@HCHACHA_OUTSZ@ bytes)
+ *
+ * Returns: ---
+ *
+ * Use: Apply the HChaCha/r pseudorandom function to @src@, writing
+ * the result to @out@.
+ */
+
+extern void hchacha20_prf(chacha_ctx */*ctx*/,
+ const void */*src*/, void */*dest*/);
+extern void hchacha12_prf(chacha_ctx */*ctx*/,
+ const void */*src*/, void */*dest*/);
+extern void hchacha8_prf(chacha_ctx */*ctx*/,
+ const void */*src*/, void */*dest*/);
+
+/*----- The XChaCha stream cipher ----------------------------------------*/
+
+/* --- @xchacha{20,12,8}_init@ --- *
+ *
+ * Arguments: @xchachaR_ctx *ctx@ = the context to fill in
+ * @const void *key@ = pointer to key material
+ * @size_t ksz@ = size of key (either 32 or 16)
+ * @const void *nonce@ = initial nonce, or null
+ *
+ * Returns: ---
+ *
+ * Use: Initializes an XChaCha/r context ready for use.
+ *
+ * There is a different function for each number of rounds,
+ * unlike for plain ChaCha.
+ */
+
+extern void xchacha20_init(xchacha20_ctx */*ctx*/,
+ const void */*key*/, size_t /*ksz*/,
+ const void */*nonce*/);
+extern void xchacha12_init(xchacha12_ctx */*ctx*/,
+ const void */*key*/, size_t /*ksz*/,
+ const void */*nonce*/);
+extern void xchacha8_init(xchacha8_ctx */*ctx*/,
+ const void */*key*/, size_t /*ksz*/,
+ const void */*nonce*/);
+
+/* --- @xchacha{20,12,8}_setnonce@ --- *
+ *
+ * Arguments: @xchachaR_ctx *ctx@ = pointer to context
+ * @const void *nonce@ = the nonce (@XCHACHA_NONCESZ@ bytes)
+ *
+ * Returns: ---
+ *
+ * Use: Set a new nonce in the context @ctx@, e.g., for processing a
+ * different message. The stream position is reset to zero (see
+ * @chacha_seek@ etc.).
+ *
+ * There is a different function for each number of rounds,
+ * unlike for plain ChaCha.
+ */
+
+extern void xchacha20_setnonce(xchacha20_ctx */*ctx*/,
+ const void */*nonce*/);
+extern void xchacha12_setnonce(xchacha12_ctx */*ctx*/,
+ const void */*nonce*/);
+extern void xchacha8_setnonce(xchacha8_ctx */*ctx*/,
+ const void */*nonce*/);
+
+/* --- @xchacha{20,12,8}_seek@, @xchacha{20,12,8}_seeku64@ --- *
+ *
+ * Arguments: @xchachaR_ctx *ctx@ = pointer to context
+ * @unsigned long i@, @kludge64 i@ = new position to set
+ *
+ * Returns: ---
+ *
+ * Use: Sets a new stream position, in units of ChaCha output
+ * blocks, which are @XCHACHA_OUTSZ@ bytes each. Byte
+ * granularity can be achieved by calling @xchachaR_encrypt@
+ * appropriately.
+ *
+ * There is a different function for each number of rounds,
+ * unlike for plain ChaCha, because the context structures are
+ * different.
+ */
+
+extern void xchacha20_seek(xchacha20_ctx */*ctx*/, unsigned long /*i*/);
+extern void xchacha12_seek(xchacha12_ctx */*ctx*/, unsigned long /*i*/);
+extern void xchacha8_seek(xchacha8_ctx */*ctx*/, unsigned long /*i*/);
+extern void xchacha20_seeku64(xchacha20_ctx */*ctx*/, kludge64 /*i*/);
+extern void xchacha12_seeku64(xchacha12_ctx */*ctx*/, kludge64 /*i*/);
+extern void xchacha8_seeku64(xchacha8_ctx */*ctx*/, kludge64 /*i*/);
+
+/* --- @xchacha{20,12,8}_tell@, @xchacha{20,12,8}_tellu64@ --- *
+ *
+ * Arguments: @chacha_ctx *ctx@ = pointer to context
+ *
+ * Returns: The current position in the output stream, in blocks,
+ * rounding upwards.
+ *
+ * There is a different function for each number of rounds,
+ * unlike for plain ChaCha, because the context structures are
+ * different.
+ */
+
+extern unsigned long xchacha20_tell(xchacha20_ctx */*ctx*/);
+extern unsigned long xchacha12_tell(xchacha12_ctx */*ctx*/);
+extern unsigned long xchacha8_tell(xchacha8_ctx */*ctx*/);
+extern kludge64 xchacha20_tellu64(xchacha20_ctx */*ctx*/);
+extern kludge64 xchacha12_tellu64(xchacha12_ctx */*ctx*/);
+extern kludge64 xchacha8_tellu64(xchacha8_ctx */*ctx*/);
+
+/* --- @xchacha{20,12,8}_encrypt@ --- *
+ *
+ * Arguments: @xchachaR_ctx *ctx@ = pointer to context
+ * @const void *src@ = source buffer (or null)
+ * @void *dest@ = destination buffer (or null)
+ * @size_t sz@ = size of the buffers
+ *
+ * Returns: ---
+ *
+ * Use: Encrypts or decrypts @sz@ bytes of data from @src@ to @dest@.
+ * XChaCha works by XORing plaintext with a keystream, so
+ * encryption and decryption are the same operation. If @dest@
+ * is null then ignore @src@ and skip @sz@ bytes of the
+ * keystream. If @src@ is null, then just write the keystream
+ * to @dest@.
+ */
+
+extern void xchacha20_encrypt(xchacha20_ctx */*ctx*/,
+ const void */*src*/, void */*dest*/,
+ size_t /*sz*/);
+extern void xchacha12_encrypt(xchacha12_ctx */*ctx*/,
+ const void */*src*/, void */*dest*/,
+ size_t /*sz*/);
+extern void xchacha8_encrypt(xchacha8_ctx */*ctx*/,
+ const void */*src*/, void */*dest*/,
+ size_t /*sz*/);
+
+/*----- Generic cipher interface ------------------------------------------*/
+
+extern const octet chacha_keysz[];
+#define chacha20_keysz chacha_keysz
+#define chacha12_keysz chacha_keysz
+#define chacha8_keysz chacha_keysz
+#define xchacha_keysz chacha_keysz
+#define xchacha20_keysz chacha_keysz
+#define xchacha12_keysz chacha_keysz
+#define xchacha8_keysz chacha_keysz
+
+const gccipher chacha20, chacha12, chacha8;
+const gccipher xchacha20, xchacha12, xchacha8;
+
+/*----- Generic random number generator interface -------------------------*/
+
+/* --- @chacha{,12,8}_rand@, @xchacha{,12,8}_rand@ --- *
+ *
+ * Arguments: @const void *k@ = pointer to key material
+ * @size_t ksz@ = size of key material
+ * @const void *n@ = pointer to nonce or null
+ * (@CHACHA_NONCESZ@ or @XCHACHA_NONCESZ@)
+ *
+ * Returns: Pointer to generic random number generator instance.
+ *
+ * Use: Creates a random number interface wrapper around
+ * the ChaCha or XChaCha stream ciphers.
+ */
+
+extern grand *chacha20_rand(const void */*k*/, size_t /*ksz*/,
+ const void */*n*/);
+extern grand *chacha12_rand(const void */*k*/, size_t /*ksz*/,
+ const void */*n*/);
+extern grand *chacha8_rand(const void */*k*/, size_t /*ksz*/,
+ const void */*n*/);
+extern grand *xchacha20_rand(const void */*k*/, size_t /*ksz*/,
+ const void */*n*/);
+extern grand *xchacha12_rand(const void */*k*/, size_t /*ksz*/,
+ const void */*n*/);
+extern grand *xchacha8_rand(const void */*k*/, size_t /*ksz*/,
+ const void */*n*/);
+
+enum {
+ CHACHA_SEEK = GRAND_SPECIFIC('S'), /* @unsigned long pos@ */
+ CHACHA_SEEKU64, /* @kludge64 pos@ */
+ CHACHA_TELL, /* @unsigned long *pos@ */
+ CHACHA_TELLU64 /* @kludge64 *pos@ */
+};
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
--- /dev/null
+### ChaCha stream cipher
+
+## These test vectors are from
+## https://tools.ietf.org/html/draft-strombergson-chacha-test-vectors-01 and
+## http://datatracker.ietf.org/doc/draft-irtf-cfrg-chacha20-poly1305/
+## Note that the latter messes up ChaCha's nonce/counter split, so we
+## compensate.
+
+chacha20-core {
+ 1
+ 657870616e642033322d62797465206b000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+ 76b8e0ada0f13d90405d6ae55386bd28bdd219b8a08ded1aa836efcc8b770dc7da41597c5157488d7724e03fb8d84a376a43b8f41518a11cc387b669b2ee6586;
+
+ 1
+ 657870616e642033322d62797465206b000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f01000000000000090000004a00000000
+ 10f1e7e4d13b5915500fdd1fa32071c4c7d1f4c733c068030422aa9ac3d46c4ed2826446079faa0914c2d705d98b02a2b5129cd1de164eb9cbd083e8a2503c4e;
+}
+
+chacha20 {
+ 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
+ 0000004a00000000 0000000000000001 0
+ 4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e
+ 6e2e359a2568f98041ba0728dd0d6981e97e7aec1d4360c20a27afccfd9fae0bf91b65c5524733ab8f593dabcd62b3571639d624e65152ab8f530c359f0861d807ca0dbf500d6a6156a38e088a22b65e52bc514d16ccf806818ce91ab77937365af90bbf74a35be6b40b8eedf2785e42874d;
+}
+
+chacha8-core {
+ 1
+ 657870616e642031362d62797465206b000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+ e28a5fa4a67f8c5defed3e6fb7303486aa8427d31419a729572d777953491120b64ab8e72b8deb85cd6aea7cb6089a101824beeb08814a428aab1fa2c816081b;
+}
+
+xchacha20 {
+ ## Unfortunately, XChaCha isn't actually defined anyway, even though it's
+ ## obvious how to do it. These test vectors are from
+ ## https://github.com/DaGenix/rust-crypto/blob/master/src/chacha20.rs
+
+ 1b27556473e985d462cd51197a9a46c76009549eac6474f206c4ee0844f68389
+ 69696ee955b62b73cd62bda875fc73d68219e0036b7a0b37 "" 0 ""
+ 4febf2fe4b359c508dc5e8b5980c88e38946d8f18f313465c862a08782648248018dacdcb904178853a46dca3a0eaaee747cba97434eaffad58fea8222047e0de6c3a6775106e0331ad714d2f27a55641340a1f1dd9f94532e68cb241cbdd150970d14e05c5b173193fb14f51c41f393835bf7f416a7e0bba81ffb8b13af0e21691d7ecec93b75e6e4183a;
+}
+
+chacha8 {
+ 00000000000000000000000000000000
+ 0000000000000000 "" 0 ""
+ e28a5fa4a67f8c5defed3e6fb7303486aa8427d31419a729572d777953491120b64ab8e72b8deb85cd6aea7cb6089a101824beeb08814a428aab1fa2c816081b8a26af448a1ba906368fd8c83831c18cec8ced811a028e675b8d2be8fce081165ceae9f1d1b7a975497749480569ceb83de6a0a587d4984f19925f5d338e430d;
+ 0000000000000000000000000000000000000000000000000000000000000000
+ 0000000000000000 "" 0 ""
+ 3e00ef2f895f40d67f5bb8e81f09a5a12c840ec3ce9a7f3b181be188ef711a1e984ce172b9216f419f445367456d5619314a42a3da86b001387bfdb80e0cfe42d2aefa0deaa5c151bf0adb6c01f2a5adc0fd581259f9a2aadcf20f8fd566a26b5032ec38bbc5da98ee0c6f568b872a65a08abf251deb21bb4b56e5d8821e68aa;
+ 01000000000000000000000000000000
+ 0000000000000000 "" 0 ""
+ 03a7669888605a0765e8357475e58673f94fc8161da76c2a3aa2f3caf9fe5449e0fcf38eb882656af83d430d410927d55c972ac4c92ab9da3713e19f761eaa147138c25c8a7ce3d5e7546746ffd2e3515ce6a4b1b2d3f380138668ed39fa92f8a1aee36258e05fae6f566673511765fdb59e05163d55a708c5f9bc45045124cb;
+ 0100000000000000000000000000000000000000000000000000000000000000
+ 0000000000000000 "" 0 ""
+ cf5ee9a0494aa9613e05d5ed725b804b12f4a465ee635acc3a311de8740489ea289d04f43c7518db56eb4433e498a1238cd8464d3763ddbb9222ee3bd8fae3c8b4355a7d93dd8867089ee643558b95754efa2bd1a8a1e2d75bcdb32015542638291941feb49965587c4fdfe219cf0ec132a6cd4dc067392e67982fe53278c0b4;
+ 00000000000000000000000000000000
+ 0100000000000000 "" 0 ""
+ 25f5bec6683916ff44bccd12d102e692176663f4cac53e719509ca74b6b2eec85da4236fb29902012adc8f0d86c8187d25cd1c486966930d0204c4ee88a6ab355a6c9976c7bc6e78baf3108c5364ef42b93b35d2694d2ddf72a4fc7ecdb968fcfe16bedb8d48102fb54f1ce3636e914c0e2dadc7caa2ab1929733a9263325e72;
+ 0000000000000000000000000000000000000000000000000000000000000000
+ 0100000000000000 "" 0 ""
+ 2b8f4bb3798306ca5130d47c4f8d4ed13aa0edccc1be6942090faeeca0d7599b7ff0fe616bb25aa0153ad6fdc88b954903c22426d478b97b22b8f9b1db00cf06470bdffbc488a8b7c701ebf4061d75c5969186497c95367809afa80bd843b040a79abc6e73a91757f1db73c8eacfa543b38f289d065ab2f3032d377b8c37fe46;
+ ffffffffffffffffffffffffffffffff
+ ffffffffffffffff "" 0 ""
+ 2204d5b81ce662193e00966034f91302f14a3fb047f58b6e6ef0d721132304163e0fb640d76ff9c3b9cd99996e6e38fad13f0e31c82244d33abbc1b11e8bf12d9a81d78e9e56604ddfae136921f51c9d81ae15119db8e756dd28024493ee571d363ae4bbcd6e7d300f99d2673aeb92ccfc6e43a38dc31bacd66b28f17b22b28a;
+ ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
+ ffffffffffffffff "" 0 ""
+ e163bbf8c9a739d18925ee8362dad2cdc973df05225afb2aa26396f2a9849a4a445e0547d31c1623c537df4ba85c70a9884a35bcbf3dfab077e98b0f68135f5481d4933f8b322ac0cd762c27235ce2b31534e0244a9a2f1fd5e94498d47ff108790c009cf9e1a348032a7694cb28024cd96d3498361edb1785af752d187ab54b;
+ 55555555555555555555555555555555
+ 5555555555555555 "" 0 ""
+ f0a23bc36270e18ed0691dc384374b9b2c5cb60110a03f56fa48a9fbbad961aa6bab4d892e96261b6f1a0919514ae56f86e066e17c71a4176ac684af1c931996950f754e728bd061d176ecf571c62a5ea5c776697b3193d3ea94cf17d7f0a14e504859d1a67c248ab298be3bb7eded3a23f61b6c5bd1a5a4cfc84bfc3d295ac5;
+ 5555555555555555555555555555555555555555555555555555555555555555
+ 5555555555555555 "" 0 ""
+ 7cb78214e4d3465b6dc62cf7a1538c88996952b4fb72cb6105f1243ce3442e2975a59ebcd2b2a598290d7538491fe65bdbfefd060d88798120a70d049dc2677dd48ff5a2513e497a5d54802d7484c4f1083944d8d0d14d6482ce09f7e5ebf20b29807d62c31874d02f5d3cc85381a745ecbc60525205e300a76961bfe51ac07c;
+ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+ aaaaaaaaaaaaaaaa "" 0 ""
+ 312d95c0bc38eff4942db2d50bdc500a30641ef7132db1a8ae838b3bea3a7ab03815d7a4cc09dbf5882a3433d743aced48136ebab73299506855c0f5437a36c6ef5ad3d6a4f6c35d9d66c2e34005b91bbbe3099e135a00ce2f700745be6253195824d4b19f69731b6177e624358c7977e67552f519b470e3f7a8ec965dc3beda;
+ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+ aaaaaaaaaaaaaaaa "" 0 ""
+ 40f9ab86c8f9a1a0cdc05a75e5531b612d71ef7f0cf9e387df6ed6972f0aae21311aa581f816c90e8a99de990b6b95aac92450f4e112712667b804c99e9c6edaf8d144f560c8c0ea36880d3b77874c9a9103d147f6ded386284801a4ee158e5ea4f9c093fc55fd344c33349dc5b699e21dc83b4296f92ee3ecabf3d51f95fe3f;
+ 00112233445566778899aabbccddeeff
+ 0f1e2d3c4b5a6978 "" 0 ""
+ 29560d280b4528400a8f4b795369fb3a01105599e9f1ed58279cfc9ece2dc5f99f1c2e52c98238f542a5c0a881d850b615d3acd9fbdb026e9368565da50e0d49dd5be8ef74248b3e251d965d8fcb21e7cfe204d4007806fbee3ce94c74bfbad2c11c621ba048147c5caa94d182ccff6fd5cf44adf96e3d68281bb49676af87e7;
+ 00112233445566778899aabbccddeeffffeeddccbbaa99887766554433221100
+ 0f1e2d3c4b5a6978 "" 0 ""
+ db43ad9d1e842d1272e4530e276b3f568f8859b3f7cf6d9d2c74fa53808cb5157a8ebf46ad3dcc4b6c7dadde131784b0120e0e22f6d5f9ffa7407d4a21b695d9c5dd30bf55612fab9bdd118920c19816470c7f5dcd42325dbbed8c57a56281c144cb0f03e81b3004624e0650a1ce5afaf9a7cd8163f6dbd72602257dd96e471e;
+ c46ec1b18ce8a878725a37e780dfb735
+ 1ada31d5cf688221 "" 0 ""
+ 6a870108859f679118f3e205e2a56a6826ef5a60a4102ac8d4770059fcb7c7bae02f5ce004a6bfbbea53014dd82107c0aa1c7ce11b7d78f2d50bd3602bbd25940560bb6a84289e0b38f5dd21d6ef6d7737e3ec0fb772da2c71c2397762e5dbbbf449e3d1639ccbfa3e069c4d871ed6395b22aaf35c8da6de2dec3d77880da8e8;
+ c46ec1b18ce8a878725a37e780dfb7351f68ed2e194c79fbc6aebee1a667975d
+ 1ada31d5cf688221 "" 0 ""
+ 838751b42d8ddd8a3d77f48825a2ba752cf4047cb308a5978ef274973be374c96ad848065871417b08f034e681fe46a93f7d5c61d1306614d4aaf257a7cff08b16f2fda170cc18a4b58a2667ed962774af792a6e7f3c77992540711a7a136d7e8a2f8d3f93816709d45a3fa5f8ce72fde15be7b841acba3a2abd557228d9fe4f;
+}
+
+chacha12 {
+ 00000000000000000000000000000000
+ 0000000000000000 "" 0 ""
+ e1047ba9476bf8ff312c01b4345a7d8ca5792b0ad467313f1dc412b5fdce32410dea8b68bd774c36a920f092a04d3f95274fbeff97bc8491fcef37f85970b4501d43b61a8f7e19fceddef368ae6bfb11101bd9fd3e4d127de30db2db1b472e76426803a45e15b962751986ef1d9d50f598a5dcdc9fa529a28357991e784ea20f;
+ 0000000000000000000000000000000000000000000000000000000000000000
+ 0000000000000000 "" 0 ""
+ 9bf49a6a0755f953811fce125f2683d50429c3bb49e074147e0089a52eae155f0564f879d27ae3c02ce82834acfa8c793a629f2ca0de6919610be82f411326be0bd58841203e74fe86fc71338ce0173dc628ebb719bdcbcc151585214cc089b442258dcda14cf111c602b8971b8cc843e91e46ca905151c02744a6b017e69316;
+ 01000000000000000000000000000000
+ 0000000000000000 "" 0 ""
+ 2a865a3b8999fa83ae8aacf33fc6be4f32c8aa9762738d26963270052f4eef8b86af758f7867560af6d0eeb973b5542bb24c8abceac8b1f36d026963d6c8a9b2d82ce0cad37d51b1052c33144a30a8239c9fca6284ac5ea750bebb2d224dbb39aa4e7acd511f8cef15a5c490590e38e96397c06cd21c389cb8b1159c240c9c0e;
+ 0100000000000000000000000000000000000000000000000000000000000000
+ 0000000000000000 "" 0 ""
+ 12056e595d56b0f6eef090f0cd25a20949248c2790525d0f930218ff0b4ddd10a6002239d9a454e29e107a7d06fefdfef0210feba044f9f29b1772c960dc29c00c7366c5cbc604240e665eb02a69372a7af979b26fbb78092ac7c4b88029a7c854513bc217bbfc7d90432e308eba15afc65aeb48ef100d5601e6afba257117a9;
+ 00000000000000000000000000000000
+ 0100000000000000 "" 0 ""
+ 91cdb2f180bc89cfe86b8b6871cd6b3af61abf6eba01635db619c40a0b2e19edfa8ce5a9bd7f53cc2c9bcfea181e9754a9e245731f658cc282c2ae1cab1ae02c4366d288f0f88e001680bc02f1b19a9637a261a13bd83e312f3758ea89ba72223d65b1cd40cea478b20f4e2bbb9a98ea05fabc05f86df9a289326d379afb99b9;
+ 0000000000000000000000000000000000000000000000000000000000000000
+ 0100000000000000 "" 0 ""
+ 64b8bdf87b828c4b6dbaf7ef698de03df8b33f635714418f9836ade59be1296946c953a0f38ecffc9ecb98e81d5d99a5edfc8f9a0a45b9e41ef3b31f028f1d0f559db4a7f222c442fe23b9a2596a88285122ee4f1363896ea77ca150912ac723bff04b026a2f807e03b29c02077d7b06fc1ab9827c13c8013a6d83bd3b52a26f;
+ ffffffffffffffffffffffffffffffff
+ ffffffffffffffff "" 0 ""
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+ ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
+ ffffffffffffffff "" 0 ""
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+}
~mdw / catacomb / commitdiff