--- /dev/null
+/* -*-c-*-
+ *
+ * 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.
+ */
+
+#ifndef CATACOMB_HMAC_DEF_H
+#define CATACOMB_HMAC_DEF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <assert.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_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) \
+ \
+/* --- Useful constants --- */ \
+ \
+const octet pre##_hmackeysz[] = { KSZ_ANY, PRE##_STATESZ }; \
+const octet pre##_sslmackeysz[] = { KSZ_ANY, PRE##_STATESZ }; \
+const octet pre##_nmackeysz[] = { KSZ_SET, 2 * PRE##_STATESZ, 0 }; \
+ \
+/* --- @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##_STATESZ); \
+ memcpy(key->ichain, ik, PRE##_STATESZ); \
+ 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_sslmacinit@ --- * \
+ * \
+ * 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 hasing using the SSL3 \
+ * variant of HMAC. \
+ */ \
+ \
+void pre##_sslmacinit(pre##_mackey *key, const void *k, size_t sz) \
+{ \
+ 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); \
+ memcpy(ctx.buf, kbuf, sz); \
+ memset(ctx.buf + sz, 0x5c, PRE##_BUFSZ - sz); \
+ pre##_compress(&ctx, ctx.buf); \
+ pre##_state(&ctx, key->ochain); \
+ \
+ pre##_init(&ctx); \
+ memcpy(ctx.buf, kbuf, sz); \
+ memset(ctx.buf + sz, 0x36, PRE##_BUFSZ - sz); \
+ 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##_STATESZ); \
+ 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, gnops, gsslops; \
+ \
+typedef struct gkctx { \
+ gmac m; \
+ const ghash_ops *gops; \
+ pre##_mackey k; \
+} gkctx; \
+ \
+typedef struct gctx { \
+ ghash h; \
+ pre##_macctx c; \
+ octet buf[PRE##_HASHSZ]; \
+} gctx; \
+ \
+static ghash *gkinit(gmac *m) \
+{ \
+ gkctx *gk = (gkctx *)m; \
+ gctx *g = S_CREATE(gctx); \
+ g->h.ops = gk->gops; \
+ pre##_macinit(&g->c, &gk->k); \
+ return (&g->h); \
+} \
+ \
+static gmac *gkey(const void *k, size_t sz) \
+{ \
+ gkctx *gk = S_CREATE(gkctx); \
+ gk->m.ops = &gkops; \
+ gk->gops = &gops; \
+ pre##_hmacinit(&gk->k, k, sz); \
+ return (&gk->m); \
+} \
+ \
+static gmac *gnkey(const void *k, size_t sz) \
+{ \
+ gkctx *gk = S_CREATE(gkctx); \
+ const octet *kk = k; \
+ assert(keysz(sz, pre##_nmackeysz) == sz); \
+ gk->m.ops = &gkops; \
+ gk->gops = &gnops; \
+ pre##_nmacinit(&gk->k, kk, kk + PRE##_STATESZ); \
+ return (&gk->m); \
+} \
+ \
+static gmac *gsslkey(const void *k, size_t sz) \
+{ \
+ gkctx *gk = S_CREATE(gkctx); \
+ gk->m.ops = &gkops; \
+ gk->gops = &gsslops; \
+ pre##_sslmacinit(&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 octet *ghdone(ghash *h, void *buf) \
+{ \
+ gctx *g = (gctx *)h; \
+ if (!buf) \
+ buf = g->buf; \
+ pre##_macdone(&g->c, buf); \
+ return (buf); \
+} \
+ \
+static ghash *ghcopy(ghash *h) \
+{ \
+ gctx *g = (gctx *)h; \
+ gctx *gg = S_CREATE(gctx); \
+ memcpy(gg, g, sizeof(gctx)); \
+ return (&gg->h); \
+} \
+ \
+static void ghdestroy(ghash *h) \
+{ \
+ gctx *g = (gctx *)h; \
+ BURN(*g); \
+ S_DESTROY(g); \
+} \
+ \
+static void gkdestroy(gmac *m) \
+{ \
+ gkctx *gk = (gkctx *)m; \
+ BURN(*gk); \
+ S_DESTROY(gk); \
+} \
+ \
+static ghash *ghinit(void) \
+{ \
+ assert(((void)"Attempt to instantiate an unkeyed MAC", 0)); \
+ return (0); \
+} \
+ \
+const gcmac pre##_nmac = \
+ { #pre "-nmac", PRE##_HASHSZ, pre##_nmackeysz, gnkey }; \
+const gcmac pre##_hmac = \
+ { #pre "-hmac", PRE##_HASHSZ, pre##_hmackeysz, gkey }; \
+const gcmac pre##_sslmac = \
+ { #pre "-sslmac", PRE##_HASHSZ, pre##_sslmackeysz, gsslkey }; \
+static const gmac_ops gkops = { &pre##_hmac, gkinit, gkdestroy }; \
+static const gmac_ops gnkops = { &pre##_nmac, gkinit, gkdestroy }; \
+static const gmac_ops gsslkops = { &pre##_sslmac, gkinit, gkdestroy }; \
+static const gchash gch = { #pre "-hmac", PRE##_HASHSZ, ghinit }; \
+static const ghash_ops gops = \
+ { &gch, ghhash, ghdone, ghdestroy, ghcopy }; \
+static const gchash gnch = { #pre "-nmac", PRE##_HASHSZ, ghinit }; \
+static const ghash_ops gnops = \
+ { &gch, ghhash, ghdone, ghdestroy, ghcopy }; \
+static const gchash gsslch = { #pre "-sslmac", PRE##_HASHSZ, ghinit }; \
+static const ghash_ops gsslops = \
+ { &gch, ghhash, ghdone, ghdestroy, ghcopy }; \
+ \
+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 <stdio.h>
+
+#include <mLib/dstr.h>
+#include <mLib/quis.h>
+#include <mLib/testrig.h>
+
+#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"/t/" #pre); \
+ return (0); \
+}
+
+#else
+# define HMAC_TEST(PRE, pre)
+#endif
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
projects / u / mdw / catacomb / blobdiff