--- /dev/null
+/* -*-c-*-
+ *
+ * $Id: counter-def.h,v 1.1 2000/06/17 10:51:42 mdw Exp $
+ *
+ * Block cipher counter mode (or long cycle mode)
+ *
+ * (c) 2000 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.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: counter-def.h,v $
+ * Revision 1.1 2000/06/17 10:51:42 mdw
+ * Counter mode ciphers and pseudo-random generator.
+ *
+ */
+
+#ifndef CATACOMB_COUNTER_DEF_H
+#define CATACOMB_COUNTER_DEF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stdarg.h>
+#include <string.h>
+
+#include <mLib/bits.h>
+#include <mLib/sub.h>
+
+#ifndef CATACOMB_ARENA_H
+# include "arena.h"
+#endif
+
+#ifndef CATACOMB_BLKC_H
+# include "blkc.h"
+#endif
+
+#ifndef CATACOMB_GCIPHER_H
+# include "gcipher.h"
+#endif
+
+#ifndef CATACOMB_PARANOIA_H
+# include "paranoia.h"
+#endif
+
+/*----- Macros ------------------------------------------------------------*/
+
+/* --- @COUNTER_DEF@ --- *
+ *
+ * Arguments: @PRE@, @pre@ = prefixes for the underlying block cipher
+ *
+ * Use: Creates definitions for counter mode.
+ */
+
+#define COUNTER_DEF(PRE, pre) \
+ \
+/* --- @pre_countergetiv@ --- * \
+ * \
+ * Arguments: @const pre_counterctx *ctx@ = pointer to counter \
+ * context \
+ * @void *iv#@ = pointer to output data block \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Reads the currently set IV. Reading and setting an IV \
+ * is not transparent to the cipher. It will add a `step' \
+ * which must be matched by a similar operation during \
+ * decryption. \
+ */ \
+ \
+void pre##_countergetiv(const pre##_counterctx *ctx, void *iv) \
+{ \
+ BLKC_STORE(PRE, iv, ctx->n); \
+} \
+ \
+/* --- @pre_countersetiv@ --- * \
+ * \
+ * Arguments: @pre_counterctx *ctx@ = pointer to counter context \
+ * @cnost void *iv@ = pointer to IV to set \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Sets the IV to use for subsequent encryption. \
+ */ \
+ \
+void pre##_countersetiv(pre##_counterctx *ctx, const void *iv) \
+{ \
+ BLKC_LOAD(PRE, ctx->n, iv); \
+ ctx->off = PRE##_BLKSZ; \
+} \
+ \
+/* --- @pre_counterbdry@ --- * \
+ * \
+ * Arguments: @pre_counterctx *ctx@ = pointer to counter context \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Inserts a boundary during encryption. Successful \
+ * decryption must place a similar boundary. \
+ */ \
+ \
+void pre##_counterbdry(pre##_counterctx *ctx) \
+{ \
+ BLKC_STEP(PRE, ctx->n); \
+ ctx->off = PRE##_BLKSZ; \
+} \
+ \
+/* --- @pre_countersetkey@ --- * \
+ * \
+ * Arguments: @pre_counterctx *ctx@ = pointer to counter context \
+ * @const pre_ctx *k@ = pointer to cipher context \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Sets the counter context to use a different cipher key. \
+ */ \
+ \
+void pre##_countersetkey(pre##_counterctx *ctx, const pre##_ctx *k) \
+{ \
+ ctx->ctx = *k; \
+} \
+ \
+/* --- @pre_counterinit@ --- * \
+ * \
+ * Arguments: @pre_counterctx *ctx@ = pointer to cipher context \
+ * @const void *key@ = pointer to the key buffer \
+ * @size_t sz@ = size of the key \
+ * @const void *iv@ = pointer to initialization vector \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Initializes a counter context ready for use. You \
+ * should ensure that the IV chosen is unique: reusing an \
+ * IV will compromise the security of the entire \
+ * plaintext. This is equivalent to calls to @pre_init@, \
+ * @pre_countersetkey@ and @pre_countersetiv@. \
+ */ \
+ \
+void pre##_counterinit(pre##_counterctx *ctx, \
+ const void *key, size_t sz, \
+ const void *iv) \
+{ \
+ static octet zero[PRE##_BLKSZ] = { 0 }; \
+ pre##_init(&ctx->ctx, key, sz); \
+ pre##_countersetiv(ctx, iv ? iv : zero); \
+} \
+ \
+/* --- @pre_counterencrypt@ --- * \
+ * \
+ * Arguments: @pre_counterctx *ctx@ = pointer to counter context \
+ * @const void *src@ = pointer to source data \
+ * @void *dest@ = pointer to destination data \
+ * @size_t sz@ = size of block to be encrypted \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Encrypts or decrypts a block with a block cipher in \
+ * counter mode: encryption and decryption are the same in \
+ * counter. The destination may be null to just churn the \
+ * feedback round for a bit. The source may be null to \
+ * use the cipher as a random data generator. \
+ */ \
+ \
+void pre##_counterencrypt(pre##_counterctx *ctx, \
+ const void *src, void *dest, \
+ size_t sz) \
+{ \
+ const octet *s = src; \
+ octet *d = dest; \
+ unsigned off = ctx->off; \
+ \
+ /* --- Empty blocks are trivial --- */ \
+ \
+ if (!sz) \
+ return; \
+ \
+ /* --- If I can deal with the block from my buffer, do that --- */ \
+ \
+ if (sz < PRE##_BLKSZ - off) \
+ goto small; \
+ \
+ /* --- Finish off what's left in my buffer --- */ \
+ \
+ if (!d) \
+ sz -= PRE##_BLKSZ - off; \
+ else { \
+ while (off < PRE##_BLKSZ) { \
+ register octet x = s ? *s++ : 0; \
+ *d++ = ctx->buf[off++] ^ x; \
+ sz--; \
+ } \
+ } \
+ \
+ /* --- Main encryption loop --- */ \
+ \
+ { \
+ uint32 n[PRE##_BLKSZ / 4]; \
+ \
+ for (;;) { \
+ pre##_eblk(&ctx->ctx, ctx->n, n); \
+ BLKC_STEP(PRE, ctx->n); \
+ if (sz < PRE##_BLKSZ) \
+ break; \
+ if (d) { \
+ if (!s) \
+ BLKC_STORE(PRE, d, n); \
+ else { \
+ uint32 x[PRE##_BLKSZ / 4]; \
+ BLKC_LOAD(PRE, x, s); \
+ BLKC_XSTORE(PRE, d, n, x); \
+ s += PRE##_BLKSZ; \
+ } \
+ d += PRE##_BLKSZ; \
+ } \
+ sz -= PRE##_BLKSZ; \
+ } \
+ \
+ BLKC_STORE(PRE, ctx->buf, n); \
+ off = 0; \
+ } \
+ \
+ /* --- Tidying up the tail end --- */ \
+ \
+ if (sz) { \
+ small: \
+ if (!d) \
+ off += sz; \
+ else do { \
+ register octet x = s ? *s++ : 0; \
+ *d++ = ctx->buf[off++] ^ x; \
+ sz--; \
+ } while (sz); \
+ } \
+ \
+ /* --- Done --- */ \
+ \
+ ctx->off = off; \
+ return; \
+} \
+ \
+/* --- Generic cipher interface --- */ \
+ \
+static const gcipher_ops gops; \
+ \
+typedef struct gctx { \
+ gcipher c; \
+ pre##_counterctx k; \
+} gctx; \
+ \
+static gcipher *ginit(const void *k, size_t sz) \
+{ \
+ gctx *g = S_CREATE(gctx); \
+ g->c.ops = &gops; \
+ pre##_counterinit(&g->k, k, sz, 0); \
+ return (&g->c); \
+} \
+ \
+static void gencrypt(gcipher *c, const void *s, void *t, size_t sz) \
+{ \
+ gctx *g = (gctx *)c; \
+ pre##_counterencrypt(&g->k, s, t, sz); \
+} \
+ \
+static void gdestroy(gcipher *c) \
+{ \
+ gctx *g = (gctx *)c; \
+ BURN(*g); \
+ S_DESTROY(g); \
+} \
+ \
+static void gsetiv(gcipher *c, const void *iv) \
+{ \
+ gctx *g = (gctx *)c; \
+ pre##_countersetiv(&g->k, iv); \
+} \
+ \
+static void gbdry(gcipher *c) \
+{ \
+ gctx *g = (gctx *)c; \
+ pre##_counterbdry(&g->k); \
+} \
+ \
+static const gcipher_ops gops = { \
+ &pre##_counter, \
+ gencrypt, gencrypt, gdestroy, gsetiv, gbdry \
+}; \
+ \
+const gccipher pre##_counter = { \
+ #pre "-counter", pre##_keysz, PRE##_BLKSZ, \
+ ginit \
+}; \
+ \
+/* --- Generic random number generator interface --- */ \
+ \
+typedef struct grctx { \
+ grand r; \
+ pre##_counterctx k; \
+} grctx; \
+ \
+static void grdestroy(grand *r) \
+{ \
+ grctx *g = (grctx *)r; \
+ BURN(*g); \
+ S_DESTROY(g); \
+} \
+ \
+static int grmisc(grand *r, unsigned op, ...) \
+{ \
+ grctx *g = (grctx *)r; \
+ va_list ap; \
+ int rc = 0; \
+ octet buf[PRE##_BLKSZ]; \
+ 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: \
+ rc = 1; \
+ break; \
+ default: \
+ rc = 0; \
+ break; \
+ } \
+ break; \
+ case GRAND_SEEDINT: \
+ BLKC_SET(PRE, g->k.n, va_arg(ap, unsigned)); \
+ g->k.off = PRE##_BLKSZ; \
+ break; \
+ case GRAND_SEEDUINT32: \
+ BLKC_SET(PRE, g->k.n, va_arg(ap, uint32)); \
+ g->k.off = PRE##_BLKSZ; \
+ break; \
+ case GRAND_SEEDBLOCK: { \
+ const void *p = va_arg(ap, const void *); \
+ size_t sz = va_arg(ap, size_t); \
+ if (sz < sizeof(buf)) { \
+ memset(buf, 0, sizeof(buf)); \
+ memcpy(buf, p, sz); \
+ p = buf; \
+ } \
+ pre##_countersetiv(&g->k, p); \
+ } break; \
+ case GRAND_SEEDRAND: { \
+ grand *rr = va_arg(ap, grand *); \
+ rr->ops->fill(rr, buf, sizeof(buf)); \
+ pre##_countersetiv(&g->k, buf); \
+ } break; \
+ default: \
+ GRAND_BADOP; \
+ break; \
+ } \
+ \
+ va_end(ap); \
+ return (rc); \
+} \
+ \
+static octet grbyte(grand *r) \
+{ \
+ grctx *g = (grctx *)r; \
+ octet o; \
+ pre##_counterencrypt(&g->k, 0, &o, 1); \
+ return (o); \
+} \
+ \
+static uint32 grword(grand *r) \
+{ \
+ grctx *g = (grctx *)r; \
+ octet b[4]; \
+ pre##_counterencrypt(&g->k, 0, b, sizeof(b)); \
+ return (LOAD32(b)); \
+} \
+ \
+static void grfill(grand *r, void *p, size_t sz) \
+{ \
+ grctx *g = (grctx *)r; \
+ pre##_counterencrypt(&g->k, 0, p, sz); \
+} \
+ \
+static const grand_ops grops = { \
+ #pre "-counter", \
+ GRAND_CRYPTO, 0, \
+ grmisc, grdestroy, \
+ grword, grbyte, grword, grand_range, grfill \
+}; \
+ \
+/* --- @pre_counterrand@ --- * \
+ * \
+ * Arguments: @const void *k@ = pointer to key material \
+ * @size_t sz@ = size of key material \
+ * \
+ * Returns: Pointer to generic random number generator interface. \
+ * \
+ * Use: Creates a random number interface wrapper around an \
+ * counter-mode block cipher. \
+ */ \
+ \
+grand *pre##_counterrand(const void *k, size_t sz) \
+{ \
+ grctx *g = S_CREATE(grctx); \
+ g->r.ops = &grops; \
+ pre##_counterinit(&g->k, k, sz, 0); \
+ return (&g->r); \
+} \
+ \
+COUNTER_TEST(PRE, pre)
+
+/*----- Test rig ----------------------------------------------------------*/
+
+#ifdef TEST_RIG
+
+#include <stdio.h>
+
+#include "daftstory.h"
+
+/* --- @COUNTER_TEST@ --- *
+ *
+ * Arguments: @PRE@, @pre@ = prefixes for block cipher definitions
+ *
+ * Use: Standard test rig for counter functions.
+ */
+
+#define COUNTER_TEST(PRE, pre) \
+ \
+/* --- Initial plaintext for the test --- */ \
+ \
+static const octet text[] = TEXT; \
+ \
+/* --- Key and IV to use --- */ \
+ \
+static const octet key[] = KEY; \
+static const octet iv[] = IV; \
+ \
+/* --- Buffers for encryption and decryption output --- */ \
+ \
+static octet ct[sizeof(text)]; \
+static octet pt[sizeof(text)]; \
+ \
+static void hexdump(const octet *p, size_t sz) \
+{ \
+ const octet *q = p + sz; \
+ for (sz = 0; p < q; p++, sz++) { \
+ printf("%02x", *p); \
+ if ((sz + 1) % PRE##_BLKSZ == 0) \
+ putchar(':'); \
+ } \
+} \
+ \
+int main(void) \
+{ \
+ size_t sz = 0, rest; \
+ pre##_counterctx ctx; \
+ int status = 0; \
+ int done = 0; \
+ pre##_ctx k; \
+ \
+ size_t keysz = PRE##_KEYSZ ? \
+ PRE##_KEYSZ : strlen((const char *)key); \
+ \
+ fputs(#pre "-counter: ", stdout); \
+ \
+ pre##_init(&k, key, keysz); \
+ pre##_countersetkey(&ctx, &k); \
+ \
+ while (sz <= sizeof(text)) { \
+ rest = sizeof(text) - sz; \
+ memcpy(ct, text, sizeof(text)); \
+ pre##_countersetiv(&ctx, iv); \
+ pre##_counterencrypt(&ctx, ct, ct, sz); \
+ pre##_counterencrypt(&ctx, ct + sz, ct + sz, rest); \
+ memcpy(pt, ct, sizeof(text)); \
+ pre##_countersetiv(&ctx, iv); \
+ pre##_counterencrypt(&ctx, pt, pt, rest); \
+ pre##_counterencrypt(&ctx, pt + rest, pt + rest, sz); \
+ if (memcmp(pt, text, sizeof(text)) == 0) { \
+ done++; \
+ if (sizeof(text) < 40 || done % 8 == 0) \
+ fputc('.', stdout); \
+ if (done % 480 == 0) \
+ fputs("\n\t", stdout); \
+ fflush(stdout); \
+ } else { \
+ printf("\nError (sz = %lu)\n", (unsigned long)sz); \
+ status = 1; \
+ printf("\tplaintext = "); hexdump(text, sz); \
+ printf(", "); hexdump(text + sz, rest); \
+ fputc('\n', stdout); \
+ printf("\tciphertext = "); hexdump(ct, sz); \
+ printf(", "); hexdump(ct + sz, rest); \
+ fputc('\n', stdout); \
+ printf("\trecovered text = "); hexdump(pt, sz); \
+ printf(", "); hexdump(pt + sz, rest); \
+ fputc('\n', stdout); \
+ fputc('\n', stdout); \
+ } \
+ if (sz < 63) \
+ sz++; \
+ else \
+ sz += 9; \
+ } \
+ \
+ fputs(status ? " failed\n" : " ok\n", stdout); \
+ return (status); \
+}
+
+#else
+# define COUNTER_TEST(PRE, pre)
+#endif
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
--- /dev/null
+/* -*-c-*-
+ *
+ * $Id: counter.h,v 1.1 2000/06/17 10:51:42 mdw Exp $
+ *
+ * Block cipher counter mode (or long cycle mode)
+ *
+ * (c) 2000 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.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: counter.h,v $
+ * Revision 1.1 2000/06/17 10:51:42 mdw
+ * Counter mode ciphers and pseudo-random generator.
+ *
+ */
+
+#ifndef CATACOMB_COUNTER_H
+#define CATACOMB_COUNTER_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stddef.h>
+
+#include <mLib/bits.h>
+
+#ifndef CATACOMB_GCIPHER_H
+# include "gcipher.h"
+#endif
+
+#ifndef CATACOMB_GRAND_H
+# include "grand.h"
+#endif
+
+/*----- Macros ------------------------------------------------------------*/
+
+/* --- @COUNTER_DECL@ --- *
+ *
+ * Arguments: @PRE@, @pre@ = prefixes for block cipher definitions
+ *
+ * Use: Makes declarations for counter mode.
+ */
+
+#define COUNTER_DECL(PRE, pre) \
+ \
+/* --- Counter mode context --- */ \
+ \
+typedef struct pre##_counterctx { \
+ pre##_ctx ctx; /* Underlying cipher context */ \
+ unsigned off; /* Current offset in buffer */ \
+ octet buf[PRE##_BLKSZ]; /* Output buffer */ \
+ uint32 n[PRE##_BLKSZ / 4]; /* Counter */ \
+} pre##_counterctx; \
+ \
+/* --- @pre_countergetiv@ --- * \
+ * \
+ * Arguments: @const pre_counterctx *ctx@ = pointer to counter \
+ * context \
+ * @void *iv#@ = pointer to output data block \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Reads the currently set IV. Reading and setting an IV \
+ * is not transparent to the cipher. It will add a `step' \
+ * which must be matched by a similar operation during \
+ * decryption. \
+ */ \
+ \
+extern void pre##_countergetiv(const pre##_counterctx */*ctx*/, \
+ void */*iv*/); \
+ \
+/* --- @pre_countersetiv@ --- * \
+ * \
+ * Arguments: @pre_counterctx *ctx@ = pointer to counter context \
+ * @cnost void *iv@ = pointer to IV to set \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Sets the IV to use for subsequent encryption. \
+ */ \
+ \
+extern void pre##_countersetiv(pre##_counterctx */*ctx*/, \
+ const void */*iv*/); \
+ \
+/* --- @pre_counterbdry@ --- * \
+ * \
+ * Arguments: @pre_counterctx *ctx@ = pointer to counter context \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Inserts a boundary during encryption. Successful \
+ * decryption must place a similar boundary. \
+ */ \
+ \
+extern void pre##_counterbdry(pre##_counterctx */*ctx*/); \
+ \
+/* --- @pre_countersetkey@ --- * \
+ * \
+ * Arguments: @pre_counterctx *ctx@ = pointer to counter context \
+ * @const pre_ctx *k@ = pointer to cipher context \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Sets the counter context to use a different cipher key. \
+ */ \
+ \
+extern void pre##_countersetkey(pre##_counterctx */*ctx*/, \
+ const pre##_ctx */*k*/); \
+ \
+/* --- @pre_counterinit@ --- * \
+ * \
+ * Arguments: @pre_counterctx *ctx@ = pointer to cipher context \
+ * @const void *key@ = pointer to the key buffer \
+ * @size_t sz@ = size of the key \
+ * @const void *iv@ = pointer to initialization vector \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Initializes a counter context ready for use. You \
+ * should ensure that the IV chosen is unique: reusing an \
+ * IV will compromise the security of the entire \
+ * plaintext. This is equivalent to calls to @pre_init@, \
+ * @pre_countersetkey@ and @pre_countersetiv@. \
+ */ \
+ \
+extern void pre##_counterinit(pre##_counterctx */*ctx*/, \
+ const void */*key*/, size_t /*sz*/, \
+ const void */*iv*/); \
+ \
+/* --- @pre_counterencrypt@ --- * \
+ * \
+ * Arguments: @pre_counterctx *ctx@ = pointer to counter context \
+ * @const void *src@ = pointer to source data \
+ * @void *dest@ = pointer to destination data \
+ * @size_t sz@ = size of block to be encrypted \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Encrypts or decrypts a block with a block cipher in \
+ * counter mode: encryption and decryption are the same in \
+ * counter. The destination may be null to just churn the \
+ * feedback round for a bit. The source may be null to \
+ * use the cipher as a random data generator. \
+ */ \
+ \
+extern void pre##_counterencrypt(pre##_counterctx */*ctx*/, \
+ const void */*src*/, void */*dest*/, \
+ size_t /*sz*/); \
+ \
+/* --- @pre_counterrand@ --- * \
+ * \
+ * Arguments: @const void *k@ = pointer to key material \
+ * @size_t sz@ = size of key material \
+ * \
+ * Returns: Pointer to generic random number generator interface. \
+ * \
+ * Use: Creates a random number interface wrapper around an \
+ * counter-mode block cipher. \
+ */ \
+ \
+extern grand *pre##_counterrand(const void */*k*/, size_t /*sz*/); \
+ \
+/* --- Generic cipher interface --- */ \
+ \
+extern const gccipher pre##_counter;
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
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