+++ /dev/null
-/* -*-c-*-
- *
- * $Id: mgf-def.h,v 1.2 2004/04/08 01:36:15 mdw Exp $
- *
- * Definitions for the MGF-1 mask generator
- *
- * (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_MGF_DEF_H
-#define CATACOMB_MGF_DEF_H
-
-#ifdef __cplusplus
- extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stdarg.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <mLib/bits.h>
-#include <mLib/sub.h>
-
-#ifndef CATACOMB_ARENA_H
-# include "arena.h"
-#endif
-
-#ifndef CATACOMB_GCIPHER_H
-# include "gcipher.h"
-#endif
-
-#ifndef CATACOMB_GRAND_H
-# include "grand.h"
-#endif
-
-#ifndef CATACOMB_PARANOIA_H
-# include "paranoia.h"
-#endif
-
-/*----- Macros ------------------------------------------------------------*/
-
-#define MGF_DEF(PRE, pre) \
- \
-/* --- Useful constants --- */ \
- \
-const octet pre##_mgfkeysz[] = { KSZ_ANY, PRE##_HASHSZ }; \
- \
-/* --- @pre_mgfkeybegin@, @pre_mgfkeyadd@ --- * \
- * \
- * Arguments: @pre_mgfctx *k@ = pointer to context to initialize \
- * @const void *p@ = pointer to data to contribute \
- * \
- * Returns: --- \
- * \
- * Use: A multi-step keying procedure for initializing an MGF \
- * context. The data is contributed to a hashing context \
- * which is then used for mask generation. If you only \
- * have a fixed buffer, you can save a lot of effort by \
- * simply calling @pre_mgfinit@. \
- */ \
- \
-void pre##_mgfkeybegin(pre##_mgfctx *k) \
-{ \
- k->c = 0; \
- k->bsz = 0; \
- pre##_init(&k->k); \
-} \
- \
-void pre##_mgfkeyadd(pre##_mgfctx *k, const void *p, size_t sz) \
-{ \
- pre##_hash(&k->k, p, sz); \
-} \
- \
-/* ---- @pre_mgfinit@ --- * \
- * \
- * Arguments: @pre_mgfctx *k@ = pointer to context to initialize \
- * @const void *p@ = pointer to data to contribute \
- * @size_t sz@ = size of data to contribute \
- * \
- * Returns: --- \
- * \
- * Use: A simpler interface to initialization if all of your \
- * keying material is in one place. \
- */ \
- \
-void pre##_mgfinit(pre##_mgfctx *k, const void *p, size_t sz) \
-{ \
- k->c = 0; \
- k->bsz = 0; \
- pre##_init(&k->k); \
- pre##_hash(&k->k, p, sz); \
-} \
- \
-/* --- @pre_mgfencrypt@ --- * \
- * \
- * Arguments: @pre_mgfctx *k@ = pointer to masking context \
- * @const void *s@ = pointer to source buffer \
- * @void *d@ = pointer to destination buffer \
- * @size_t sz@ = size of buffers \
- * \
- * Returns: --- \
- * \
- * Use: Outputs pseudorandom data, or masks an input buffer. \
- * \
- * If @s@ is nonzero, the source material is exclusive- \
- * orred with the generated mask. If @d@ is zero, the \
- * generator is simply spun around for a while, which \
- * isn't very useful. \
- */ \
- \
-void pre##_mgfencrypt(pre##_mgfctx *k, const void *s, \
- void *d, size_t sz) \
-{ \
- const octet *ss = s; \
- octet *dd = d; \
- \
- /* --- Empty the buffer if there's anything there --- */ \
- \
- if (k->bsz) { \
- const octet *p = k->buf + PRE##_HASHSZ - k->bsz; \
- size_t n = sz > k->bsz ? k->bsz : sz; \
- sz -= n; \
- k->bsz -= n; \
- if (dd) { \
- if (!ss) { \
- memcpy(dd, p, n); \
- dd += n; \
- } else { \
- while (n) { \
- *dd++ = *ss++ ^ *p++; \
- n--; \
- } \
- } \
- } \
- } \
- \
- /* --- While necessary, generate some more mask --- */ \
- \
- while (sz) { \
- pre##_ctx c = k->k; /* Not quick! */ \
- size_t n; \
- \
- STORE32(k->buf, k->c); \
- k->c++; \
- pre##_hash(&c, k->buf, 4); \
- pre##_done(&c, k->buf); \
- n = sz > PRE##_HASHSZ ? PRE##_HASHSZ : sz; \
- k->bsz = PRE##_HASHSZ - n; \
- sz -= n; \
- if (dd) { \
- const octet *p = k->buf; \
- if (!ss) { \
- memcpy(dd, p, n); \
- dd += n; \
- } else { \
- while (n) { \
- *dd++ = *ss++ ^ *p++; \
- n--; \
- } \
- } \
- } \
- } \
-} \
- \
-/* --- @pre_mgfsetindex@ --- * \
- * \
- * Arguments: @pre_mgfctx *k@ = pointer to masking context \
- * @uint32 *c@ = new index to set \
- * \
- * Returns: --- \
- * \
- * Use: Sets a new index. This may be used to step around the \
- * output stream in a rather crude way. \
- */ \
- \
-void pre##_mgfsetindex(pre##_mgfctx *k, uint32 c) \
-{ \
- k->c = c; \
- k->bsz = 0; \
-} \
- \
-/* --- Generic cipher interface --- */ \
- \
-static const gcipher_ops gops; \
- \
-typedef struct gctx { \
- gcipher c; \
- pre##_mgfctx k; \
-} gctx; \
- \
-static gcipher *ginit(const void *k, size_t sz) \
-{ \
- gctx *g = S_CREATE(gctx); \
- g->c.ops = &gops; \
- pre##_mgfinit(&g->k, k, sz); \
- return (&g->c); \
-} \
- \
-static void gencrypt(gcipher *c, const void *s, void *t, size_t sz) \
-{ \
- gctx *g = (gctx *)c; \
- pre##_mgfencrypt(&g->k, s, t, sz); \
-} \
- \
-static void gdestroy(gcipher *c) \
-{ \
- gctx *g = (gctx *)c; \
- BURN(*g); \
- S_DESTROY(g); \
-} \
- \
-static const gcipher_ops gops = { \
- &pre##_mgf, \
- gencrypt, gencrypt, gdestroy, 0, 0 \
-}; \
- \
-const gccipher pre##_mgf = { \
- #pre "-mgf", pre##_mgfkeysz, 0, \
- ginit \
-}; \
- \
-/* --- Generic random number generator interface --- */ \
- \
-typedef struct grctx { \
- grand r; \
- pre##_mgfctx 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; \
- 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: \
- pre##_mgfsetindex(&g->k, va_arg(ap, unsigned)); \
- break; \
- case GRAND_SEEDUINT32: \
- pre##_mgfsetindex(&g->k, va_arg(ap, uint32)); \
- break; \
- case GRAND_SEEDBLOCK: { \
- const void *p = va_arg(ap, const void *); \
- size_t sz = va_arg(ap, size_t); \
- pre##_hash(&g->k.k, p, sz); \
- } break; \
- case GRAND_SEEDRAND: { \
- octet buf[PRE##_BUFSZ]; \
- grand *rr = va_arg(ap, grand *); \
- rr->ops->fill(rr, buf, sizeof(buf)); \
- pre##_hash(&g->k.k, buf, sizeof(buf)); \
- } break; \
- default: \
- GRAND_BADOP; \
- break; \
- } \
- \
- va_end(ap); \
- return (rc); \
-} \
- \
-static octet grbyte(grand *r) \
-{ \
- grctx *g = (grctx *)r; \
- octet o; \
- pre##_mgfencrypt(&g->k, 0, &o, 1); \
- return (o); \
-} \
- \
-static uint32 grword(grand *r) \
-{ \
- grctx *g = (grctx *)r; \
- octet b[4]; \
- pre##_mgfencrypt(&g->k, 0, b, sizeof(b)); \
- return (LOAD32(b)); \
-} \
- \
-static void grfill(grand *r, void *p, size_t sz) \
-{ \
- grctx *g = (grctx *)r; \
- pre##_mgfencrypt(&g->k, 0, p, sz); \
-} \
- \
-static const grand_ops grops = { \
- #pre "-mgf", \
- GRAND_CRYPTO, 0, \
- grmisc, grdestroy, \
- grword, grbyte, grword, grand_range, grfill \
-}; \
- \
-/* --- @pre_mgfrand@ --- * \
- * \
- * Arguments: @const void *k@ = pointer to key material \
- * @size_t sz@ = size of key material \
- * \
- * Returns: Pointer to a generic random number generator instance. \
- * \
- * Use: Creates a random number interface wrapper around an \
- * MGF-1-mode hash function. \
- */ \
- \
-extern grand *pre##_mgfrand(const void *k, size_t sz) \
-{ \
- grctx *g = S_CREATE(grctx); \
- g->r.ops = &grops; \
- pre##_mgfinit(&g->k, k, sz); \
- return (&g->r); \
-} \
- \
-MGF_TEST(PRE, pre)
-
-/*----- Test rig ----------------------------------------------------------*/
-
-#ifdef TEST_RIG
-
-#include <stdio.h>
-
-#include "daftstory.h"
-
-/* --- @MGF_TEST@ --- *
- *
- * Arguments: @PRE@, @pre@ = prefixes for block cipher definitions
- *
- * Use: Standard test rig for MGF functions.
- */
-
-#define MGF_TEST(PRE, pre) \
- \
-/* --- Initial plaintext for the test --- */ \
- \
-static const octet text[] = TEXT; \
- \
-/* --- Key and IV to use --- */ \
- \
-static const octet key[] = KEY; \
- \
-/* --- 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##_HASHSZ == 0) \
- putchar(':'); \
- } \
-} \
- \
-int main(void) \
-{ \
- size_t sz = 0, rest; \
- pre##_mgfctx ctx; \
- int status = 0; \
- int done = 0; \
- \
- size_t keysz = strlen((const char *)key); \
- \
- fputs(#pre "-mgf: ", stdout); \
- \
- pre##_mgfinit(&ctx, key, keysz); \
- \
- while (sz <= sizeof(text)) { \
- rest = sizeof(text) - sz; \
- memcpy(ct, text, sizeof(text)); \
- pre##_mgfsetindex(&ctx, 0); \
- pre##_mgfencrypt(&ctx, ct, ct, sz); \
- pre##_mgfencrypt(&ctx, ct + sz, ct + sz, rest); \
- memcpy(pt, ct, sizeof(text)); \
- pre##_mgfsetindex(&ctx, 0); \
- pre##_mgfencrypt(&ctx, pt, pt, rest); \
- pre##_mgfencrypt(&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 MGF_TEST(PRE, pre)
-#endif
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
- }
-#endif
-
-#endif
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