X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/aa1082f28ddd05f3b946ca1a9c6bfaa17d18aca5..79ba130cb5776f994f6a3f0f87159d8cbc5ff129:/hmac-def.h diff --git a/hmac-def.h b/hmac-def.h new file mode 100644 index 0000000..3f96649 --- /dev/null +++ b/hmac-def.h @@ -0,0 +1,343 @@ +/* -*-c-*- + * + * $Id: hmac-def.h,v 1.1 1999/12/10 23:16:40 mdw Exp $ + * + * Definitions for HMAC and NMAC + * + * (c) 1999 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: hmac-def.h,v $ + * Revision 1.1 1999/12/10 23:16:40 mdw + * Split mode macros into interface and implementation. + * + */ + +#ifndef CATACOMB_HMAC_DEF_H +#define CATACOMB_HMAC_DEF_H + +#ifdef __cplusplus + extern "C" { +#endif + +/*----- Header files ------------------------------------------------------*/ + +#include +#include + +#include +#include + +#ifndef CATACOMB_GMAC_H +# include "gmac.h" +#endif + +#ifndef CATACOMB_PARANOIA_H +# include "paranoia.h" +#endif + +/*----- Macros ------------------------------------------------------------*/ + +/* --- @HMAC_DEF@ --- * + * + * Arguments: @PRE@, @pre@ = prefixes for the underlying hash function + * + * Use: Creates implementations for the HMAC and NMAC functions. + */ + +#define HMAC_DEF(PRE, pre) \ + \ +/* --- @pre_nmacinit@ --- * \ + * \ + * Arguments: @pre_macctx *key@ = pointer to a MAC key object \ + * @const void *ok@ = pointer to outer hash init vector \ + * @const void *ik@ = pointer to inner hash init vector \ + * \ + * Returns: --- \ + * \ + * Use: Initializes a MAC key for doing NMAC hashing. \ + */ \ + \ +void pre##_nmacinit(pre##_mackey *key, const void *ok, const void *ik) \ +{ \ + memcpy(key->ochain, ok, PRE##_HASHSZ); \ + memcpy(key->ichain, ik, PRE##_HASHSZ); \ + key->ocount = key->icount = 0; \ +} \ + \ +/* --- @pre_hmacinit@ --- * \ + * \ + * Arguments: @pre_mackey *key@ = pointer to MAC key object \ + * @const void *k@ = pointer to key to use \ + * @size_t sz@ = size of key data \ + * \ + * Returns: --- \ + * \ + * Use: Initializes a MAC key for doing HMAC hashing. Keys \ + * longer than the hash function's output size aren't very \ + * useful, but are accepted. Keys longer than the hash's \ + * block size are also accepted; they are hashed before \ + * use, as specified in RFC2104. \ + */ \ + \ +void pre##_hmacinit(pre##_mackey *key, const void *k, size_t sz) \ +{ \ + int i; \ + const octet *kbuf = k; \ + pre##_ctx ctx; \ + octet buf[PRE##_HASHSZ]; \ + \ + if (sz > PRE##_BUFSZ) { \ + pre##_init(&ctx); \ + pre##_hash(&ctx, k, sz); \ + pre##_done(&ctx, buf); \ + kbuf = buf; \ + sz = PRE##_HASHSZ; \ + } \ + \ + pre##_init(&ctx); \ + memset(ctx.buf, 0x5c, PRE##_BUFSZ); \ + for (i = 0; i < sz; i++) \ + ctx.buf[i] ^= kbuf[i]; \ + pre##_compress(&ctx, ctx.buf); \ + pre##_state(&ctx, key->ochain); \ + \ + pre##_init(&ctx); \ + memset(ctx.buf, 0x36, PRE##_BUFSZ); \ + for (i = 0; i < sz; i++) \ + ctx.buf[i] ^= kbuf[i]; \ + pre##_compress(&ctx, ctx.buf); \ + pre##_state(&ctx, key->ichain); \ + \ + key->ocount = key->icount = PRE##_BUFSZ; \ + BURN(ctx); \ +} \ + \ +/* --- @pre_macinit@ --- * \ + * \ + * Arguments: @pre_macctx *ctx@ = pointer to MAC context block \ + * @const pre_mackey *key@ = pointer to MAC key block \ + * \ + * Returns: --- \ + * \ + * Use: Instantiates a MAC context from a key block. \ + */ \ + \ +void pre##_macinit(pre##_macctx *ctx, const pre##_mackey *key) \ +{ \ + memcpy(ctx->chain, key->ochain, PRE##_HASHSZ); \ + ctx->count = key->ocount; \ + pre##_set(&ctx->ctx, key->ichain, key->icount); \ +} \ + \ +/* --- @pre_machash@ --- * \ + * \ + * Arguments: @pre_macctx *ctx@ = pointer to MAC context block \ + * @const void *buf@ = pointer to buffer \ + * @size_t sz@ = size of the buffer \ + * \ + * Returns: --- \ + * \ + * Use: Hashes a buffer. \ + */ \ + \ +void pre##_machash(pre##_macctx *ctx, const void *buf, size_t sz) \ +{ \ + pre##_hash(&ctx->ctx, buf, sz); \ +} \ + \ +/* --- @pre_macdone@ --- * \ + * \ + * Arguments: @pre_macctx *ctx@ = pointer to MAC context block \ + * @void *mac@ = pointer to buffer to receive MAC \ + * \ + * Returns: --- \ + * \ + * Use: Returns the result of a MAC computation. \ + */ \ + \ +void pre##_macdone(pre##_macctx *ctx, void *mac) \ +{ \ + pre##_done(&ctx->ctx, mac); \ + pre##_set(&ctx->ctx, ctx->chain, ctx->count); \ + pre##_hash(&ctx->ctx, mac, PRE##_HASHSZ); \ + pre##_done(&ctx->ctx, mac); \ +} \ + \ +/* --- Generic MAC interface --- */ \ + \ +static const gmac_ops gkops; \ +static const ghash_ops gops; \ + \ +typedef struct gkctx { \ + gmac m; \ + pre##_mackey k; \ +} gkctx; \ + \ +typedef struct gctx { \ + ghash h; \ + pre##_macctx c; \ +} gctx; \ + \ +static ghash *gkinit(gmac *m) \ +{ \ + gkctx *gk = (gkctx *)m; \ + gctx *g = CREATE(gctx); \ + g->h.ops = &gops; \ + pre##_macinit(&g->c, &gk->k); \ + return (&g->h); \ +} \ + \ +static gmac *gkey(const void *k, size_t sz) \ +{ \ + gkctx *gk = CREATE(gkctx); \ + gk->m.ops = &gkops; \ + pre##_hmacinit(&gk->k, k, sz); \ + return (&gk->m); \ +} \ + \ +static void ghhash(ghash *h, const void *p, size_t sz) \ +{ \ + gctx *g = (gctx *)h; \ + pre##_machash(&g->c, p, sz); \ +} \ + \ +static void ghdone(ghash *h, void *buf) \ +{ \ + gctx *g = (gctx *)h; \ + pre##_macdone(&g->c, buf); \ +} \ + \ +static void ghdestroy(ghash *h) \ +{ \ + gctx *g = (gctx *)h; \ + DESTROY(g); \ +} \ + \ +static void gkdestroy(gmac *m) \ +{ \ + gkctx *gk = (gkctx *)m; \ + DESTROY(gk); \ +} \ + \ +const gcmac pre##_hmac = { { #pre "-hmac", PRE##_HASHSZ }, gkey }; \ +static const gmac_ops gkops = { &pre##_hmac.b, gkinit, gkdestroy }; \ +static const ghash_ops gops = \ + { &pre##_hmac.b, ghhash, ghdone, ghdestroy }; \ + \ +HMAC_TEST(PRE, pre) + +/* --- @HMAC_TEST@ --- * + * + * Arguments: @PRE@, @pre@ = prefixes for hash-specfic definitions + * + * Use: Standard test rig for MAC functions. + */ + +#ifdef TEST_RIG + +#include + +#include +#include +#include + +#define HMAC_TEST(PRE, pre) \ + \ +static int macverify(dstr *v) \ +{ \ + pre##_macctx cctx; \ + pre##_mackey ckey; \ + int ok = 1; \ + int i; \ + octet *p; \ + int szs[] = { 1, 7, 192, -1, 0 }, *ip; \ + size_t csz; \ + dstr d; \ + \ + dstr_create(&d); \ + dstr_ensure(&d, PRE##_HASHSZ); \ + d.len = PRE##_HASHSZ; \ + \ + pre##_hmacinit(&ckey, v[1].buf, v[1].len); \ + \ + for (ip = szs; *ip; ip++) { \ + i = *ip; \ + csz = v[0].len; \ + if (i == -1) \ + i = csz; \ + if (i > csz) \ + continue; \ + p = (octet *)v[0].buf; \ + pre##_macinit(&cctx, &ckey); \ + while (csz) { \ + if (i > csz) \ + i = csz; \ + pre##_machash(&cctx, p, i); \ + p += i; \ + csz -= i; \ + } \ + pre##_macdone(&cctx, d.buf); \ + if (memcmp(d.buf, v[2].buf, PRE##_HASHSZ) != 0) { \ + printf("\nfail:\n\tstep = %i\n\tinput = `%s'\n\tkey = ", \ + *ip, v[0].buf); \ + type_hex.dump(&v[1], stdout); \ + fputs("\n\texpected = ", stdout); \ + type_hex.dump(&v[2], stdout); \ + fputs("\n\tcomputed = ", stdout); \ + type_hex.dump(&d, stdout); \ + putchar('\n'); \ + ok = 0; \ + } \ + } \ + \ + dstr_destroy(&d); \ + return (ok); \ +} \ + \ +static test_chunk macdefs[] = { \ + { #pre "-hmac", macverify, \ + { &type_string, &type_hex, &type_hex, 0 } }, \ + { 0, 0, { 0 } } \ +}; \ + \ +int main(int argc, char *argv[]) \ +{ \ + ego(argv[0]); \ + test_run(argc, argv, macdefs, SRCDIR"/tests/" #pre); \ + return (0); \ +} + +#else +# define HMAC_TEST(PRE, pre) +#endif + +/*----- That's all, folks -------------------------------------------------*/ + +#ifdef __cplusplus + } +#endif + +#endif