X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/counter-def.h diff --git a/counter-def.h b/counter-def.h deleted file mode 100644 index 129efd9..0000000 --- a/counter-def.h +++ /dev/null @@ -1,535 +0,0 @@ -/* -*-c-*- - * - * $Id: counter-def.h,v 1.4 2004/04/08 01:36:15 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. - */ - -#ifndef CATACOMB_COUNTER_DEF_H -#define CATACOMB_COUNTER_DEF_H - -#ifdef __cplusplus - extern "C" { -#endif - -/*----- Header files ------------------------------------------------------*/ - -#include -#include - -#include -#include - -#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 const 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 - -#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