+++ /dev/null
-/* -*-c-*-
- *
- * $Id: sha.c,v 1.4 2004/04/08 01:36:15 mdw Exp $
- *
- * Implementation of the SHA-1 hash function
- *
- * (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.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <mLib/bits.h>
-
-#include "ghash.h"
-#include "ghash-def.h"
-#include "hash.h"
-#include "sha.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @sha_compress@ --- *
- *
- * Arguments: @sha_ctx *ctx@ = pointer to context block
- * @const void *sbuf@ = pointer to buffer of appropriate size
- *
- * Returns: ---
- *
- * Use: SHA-1 compression function.
- */
-
-void sha_compress(sha_ctx *ctx, const void *sbuf)
-{
- uint32 a, b, c, d, e;
- uint32 buf[80];
-
- /* --- Fetch the chaining variables --- */
-
- a = ctx->a;
- b = ctx->b;
- c = ctx->c;
- d = ctx->d;
- e = ctx->e;
-
- /* --- Fetch and expand the buffer contents --- */
-
- {
- int i;
- const octet *p;
-
- for (i = 0, p = sbuf; i < 16; i++, p += 4)
- buf[i] = LOAD32(p);
- for (i = 16; i < 80; i++) {
- uint32 x = buf[i - 3] ^ buf[i - 8] ^ buf[i - 14] ^ buf[i - 16];
- buf[i] = ROL32(x, 1);
- }
- }
-
- /* --- Definitions for round functions --- */
-
-#define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
-#define G(x, y, z) ((x) ^ (y) ^ (z))
-#define H(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
-
-#define T(v, w, x, y, z, i, f, k) do { \
- z = ROL32(v, 5) + f(w, x, y) + z + buf[i] + k; \
- w = ROR32(w, 2); \
-} while (0)
-
-#define FF(v, w, x, y, z, i) T(v, w, x, y, z, i, F, 0x5a827999)
-#define GG(v, w, x, y, z, i) T(v, w, x, y, z, i, G, 0x6ed9eba1)
-#define HH(v, w, x, y, z, i) T(v, w, x, y, z, i, H, 0x8f1bbcdc)
-#define II(v, w, x, y, z, i) T(v, w, x, y, z, i, G, 0xca62c1d6)
-
- /* --- The main compression function --- */
-
- FF(a, b, c, d, e, 0);
- FF(e, a, b, c, d, 1);
- FF(d, e, a, b, c, 2);
- FF(c, d, e, a, b, 3);
- FF(b, c, d, e, a, 4);
- FF(a, b, c, d, e, 5);
- FF(e, a, b, c, d, 6);
- FF(d, e, a, b, c, 7);
- FF(c, d, e, a, b, 8);
- FF(b, c, d, e, a, 9);
- FF(a, b, c, d, e, 10);
- FF(e, a, b, c, d, 11);
- FF(d, e, a, b, c, 12);
- FF(c, d, e, a, b, 13);
- FF(b, c, d, e, a, 14);
- FF(a, b, c, d, e, 15);
- FF(e, a, b, c, d, 16);
- FF(d, e, a, b, c, 17);
- FF(c, d, e, a, b, 18);
- FF(b, c, d, e, a, 19);
-
- GG(a, b, c, d, e, 20);
- GG(e, a, b, c, d, 21);
- GG(d, e, a, b, c, 22);
- GG(c, d, e, a, b, 23);
- GG(b, c, d, e, a, 24);
- GG(a, b, c, d, e, 25);
- GG(e, a, b, c, d, 26);
- GG(d, e, a, b, c, 27);
- GG(c, d, e, a, b, 28);
- GG(b, c, d, e, a, 29);
- GG(a, b, c, d, e, 30);
- GG(e, a, b, c, d, 31);
- GG(d, e, a, b, c, 32);
- GG(c, d, e, a, b, 33);
- GG(b, c, d, e, a, 34);
- GG(a, b, c, d, e, 35);
- GG(e, a, b, c, d, 36);
- GG(d, e, a, b, c, 37);
- GG(c, d, e, a, b, 38);
- GG(b, c, d, e, a, 39);
-
- HH(a, b, c, d, e, 40);
- HH(e, a, b, c, d, 41);
- HH(d, e, a, b, c, 42);
- HH(c, d, e, a, b, 43);
- HH(b, c, d, e, a, 44);
- HH(a, b, c, d, e, 45);
- HH(e, a, b, c, d, 46);
- HH(d, e, a, b, c, 47);
- HH(c, d, e, a, b, 48);
- HH(b, c, d, e, a, 49);
- HH(a, b, c, d, e, 50);
- HH(e, a, b, c, d, 51);
- HH(d, e, a, b, c, 52);
- HH(c, d, e, a, b, 53);
- HH(b, c, d, e, a, 54);
- HH(a, b, c, d, e, 55);
- HH(e, a, b, c, d, 56);
- HH(d, e, a, b, c, 57);
- HH(c, d, e, a, b, 58);
- HH(b, c, d, e, a, 59);
-
- II(a, b, c, d, e, 60);
- II(e, a, b, c, d, 61);
- II(d, e, a, b, c, 62);
- II(c, d, e, a, b, 63);
- II(b, c, d, e, a, 64);
- II(a, b, c, d, e, 65);
- II(e, a, b, c, d, 66);
- II(d, e, a, b, c, 67);
- II(c, d, e, a, b, 68);
- II(b, c, d, e, a, 69);
- II(a, b, c, d, e, 70);
- II(e, a, b, c, d, 71);
- II(d, e, a, b, c, 72);
- II(c, d, e, a, b, 73);
- II(b, c, d, e, a, 74);
- II(a, b, c, d, e, 75);
- II(e, a, b, c, d, 76);
- II(d, e, a, b, c, 77);
- II(c, d, e, a, b, 78);
- II(b, c, d, e, a, 79);
-
- /* --- Update the chaining variables --- */
-
- ctx->a += a;
- ctx->b += b;
- ctx->c += c;
- ctx->d += d;
- ctx->e += e;
-}
-
-/* --- @sha_init@ --- *
- *
- * Arguments: @sha_ctx *ctx@ = pointer to context block to initialize
- *
- * Returns: ---
- *
- * Use: Initializes a context block ready for hashing.
- */
-
-void sha_init(sha_ctx *ctx)
-{
- ctx->a = 0x67452301;
- ctx->b = 0xefcdab89;
- ctx->c = 0x98badcfe;
- ctx->d = 0x10325476;
- ctx->e = 0xc3d2e1f0;
- ctx->off = 0;
- ctx->nl = ctx->nh = 0;
-}
-
-/* --- @sha_set@ --- *
- *
- * Arguments: @sha_ctx *ctx@ = pointer to context block
- * @const void *buf@ = pointer to state buffer
- * @unsigned long count@ = current count of bytes processed
- *
- * Returns: ---
- *
- * Use: Initializes a context block from a given state. This is
- * useful in cases where the initial hash state is meant to be
- * secret, e.g., for NMAC and HMAC support.
- */
-
-void sha_set(sha_ctx *ctx, const void *buf, unsigned long count)
-{
- const octet *p = buf;
- ctx->a = LOAD32(p + 0);
- ctx->b = LOAD32(p + 4);
- ctx->c = LOAD32(p + 8);
- ctx->d = LOAD32(p + 12);
- ctx->e = LOAD32(p + 16);
- ctx->off = 0;
- ctx->nl = U32(count);
- ctx->nh = U32(((count & ~MASK32) >> 16) >> 16);
-}
-
-/* --- @sha_hash@ --- *
- *
- * Arguments: @sha_ctx *ctx@ = pointer to context block
- * @const void *buf@ = buffer of data to hash
- * @size_t sz@ = size of buffer to hash
- *
- * Returns: ---
- *
- * Use: Hashes a buffer of data. The buffer may be of any size and
- * alignment.
- */
-
-void sha_hash(sha_ctx *ctx, const void *buf, size_t sz)
-{
- HASH_BUFFER(SHA, sha, ctx, buf, sz);
-}
-
-/* --- @sha_done@ --- *
- *
- * Arguments: @sha_ctx *ctx@ = pointer to context block
- * @void *hash@ = pointer to output buffer
- *
- * Returns: ---
- *
- * Use: Returns the hash of the data read so far.
- */
-
-void sha_done(sha_ctx *ctx, void *hash)
-{
- octet *p = hash;
- HASH_PAD(SHA, sha, ctx, 0x80, 0, 8);
- STORE32(ctx->buf + SHA_BUFSZ - 8, (ctx->nl >> 29) | (ctx->nh << 3));
- STORE32(ctx->buf + SHA_BUFSZ - 4, ctx->nl << 3);
- sha_compress(ctx, ctx->buf);
- STORE32(p + 0, ctx->a);
- STORE32(p + 4, ctx->b);
- STORE32(p + 8, ctx->c);
- STORE32(p + 12, ctx->d);
- STORE32(p + 16, ctx->e);
-}
-
-/* --- @sha_state@ --- *
- *
- * Arguments: @sha_ctx *ctx@ = pointer to context
- * @void *state@ = pointer to buffer for current state
- *
- * Returns: Number of bytes written to the hash function so far.
- *
- * Use: Returns the current state of the hash function such that
- * it can be passed to @sha_set@.
- */
-
-unsigned long sha_state(sha_ctx *ctx, void *state)
-{
- octet *p = state;
- STORE32(p + 0, ctx->a);
- STORE32(p + 4, ctx->b);
- STORE32(p + 8, ctx->c);
- STORE32(p + 12, ctx->d);
- STORE32(p + 16, ctx->e);
- return (ctx->nl | ((ctx->nh << 16) << 16));
-}
-
-/* --- Generic interface --- */
-
-GHASH_DEF(SHA, sha)
-
-/* --- Test code --- */
-
-HASH_TEST(SHA, sha)
-
-/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff