+++ /dev/null
-/* -*-c-*-
- *
- * $Id: sha256.c,v 1.3 2004/04/08 01:36:15 mdw Exp $
- *
- * Implementation of the SHA-256 hash function
- *
- * (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.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <mLib/bits.h>
-
-#include "ghash.h"
-#include "ghash-def.h"
-#include "hash.h"
-#include "sha256.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-/* --- @sha256_compress@, @sha224_compress@ --- *
- *
- * Arguments: @sha256_ctx *ctx@ = pointer to context block
- * @const void *sbuf@ = pointer to buffer of appropriate size
- *
- * Returns: ---
- *
- * Use: SHA-256 compression function.
- */
-
-void sha256_compress(sha256_ctx *ctx, const void *sbuf)
-{
- uint32 a, b, c, d, e, f, g, h;
- uint32 buf[64];
-
- /* --- Fetch the chaining variables --- */
-
- a = ctx->a;
- b = ctx->b;
- c = ctx->c;
- d = ctx->d;
- e = ctx->e;
- f = ctx->f;
- g = ctx->g;
- h = ctx->h;
-
- /* --- Definitions for round functions --- */
-
-#define CH(x, y, z) (((x) & (y)) | (~(x) & (z)))
-#define MAJ(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
-
-#define S0(x) (ROR32((x), 2) ^ ROR32((x), 13) ^ ROR32((x), 22))
-#define S1(x) (ROR32((x), 6) ^ ROR32((x), 11) ^ ROR32((x), 25))
-#define s0(x) (ROR32((x), 7) ^ ROR32((x), 18) ^ LSR32((x), 3))
-#define s1(x) (ROR32((x), 17) ^ ROR32((x), 19) ^ LSR32((x), 10))
-
-#define T(a, b, c, d, e, f, g, h, i, k) do { \
- uint32 t1 = h + S1(e) + CH(e, f, g) + k + buf[i]; \
- uint32 t2 = S0(a) + MAJ(a, b, c); \
- d += t1; h = t1 + t2; \
-} while (0)
-
- /* --- 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 < 64; i++)
- buf[i] = s1(buf[i - 2]) + buf[i - 7] + s0(buf[i - 15]) + buf[i - 16];
- }
-
- /* --- The main compression function --- */
-
- T(a, b, c, d, e, f, g, h, 0, 0x428a2f98);
- T(h, a, b, c, d, e, f, g, 1, 0x71374491);
- T(g, h, a, b, c, d, e, f, 2, 0xb5c0fbcf);
- T(f, g, h, a, b, c, d, e, 3, 0xe9b5dba5);
- T(e, f, g, h, a, b, c, d, 4, 0x3956c25b);
- T(d, e, f, g, h, a, b, c, 5, 0x59f111f1);
- T(c, d, e, f, g, h, a, b, 6, 0x923f82a4);
- T(b, c, d, e, f, g, h, a, 7, 0xab1c5ed5);
- T(a, b, c, d, e, f, g, h, 8, 0xd807aa98);
- T(h, a, b, c, d, e, f, g, 9, 0x12835b01);
- T(g, h, a, b, c, d, e, f, 10, 0x243185be);
- T(f, g, h, a, b, c, d, e, 11, 0x550c7dc3);
- T(e, f, g, h, a, b, c, d, 12, 0x72be5d74);
- T(d, e, f, g, h, a, b, c, 13, 0x80deb1fe);
- T(c, d, e, f, g, h, a, b, 14, 0x9bdc06a7);
- T(b, c, d, e, f, g, h, a, 15, 0xc19bf174);
- T(a, b, c, d, e, f, g, h, 16, 0xe49b69c1);
- T(h, a, b, c, d, e, f, g, 17, 0xefbe4786);
- T(g, h, a, b, c, d, e, f, 18, 0x0fc19dc6);
- T(f, g, h, a, b, c, d, e, 19, 0x240ca1cc);
- T(e, f, g, h, a, b, c, d, 20, 0x2de92c6f);
- T(d, e, f, g, h, a, b, c, 21, 0x4a7484aa);
- T(c, d, e, f, g, h, a, b, 22, 0x5cb0a9dc);
- T(b, c, d, e, f, g, h, a, 23, 0x76f988da);
- T(a, b, c, d, e, f, g, h, 24, 0x983e5152);
- T(h, a, b, c, d, e, f, g, 25, 0xa831c66d);
- T(g, h, a, b, c, d, e, f, 26, 0xb00327c8);
- T(f, g, h, a, b, c, d, e, 27, 0xbf597fc7);
- T(e, f, g, h, a, b, c, d, 28, 0xc6e00bf3);
- T(d, e, f, g, h, a, b, c, 29, 0xd5a79147);
- T(c, d, e, f, g, h, a, b, 30, 0x06ca6351);
- T(b, c, d, e, f, g, h, a, 31, 0x14292967);
- T(a, b, c, d, e, f, g, h, 32, 0x27b70a85);
- T(h, a, b, c, d, e, f, g, 33, 0x2e1b2138);
- T(g, h, a, b, c, d, e, f, 34, 0x4d2c6dfc);
- T(f, g, h, a, b, c, d, e, 35, 0x53380d13);
- T(e, f, g, h, a, b, c, d, 36, 0x650a7354);
- T(d, e, f, g, h, a, b, c, 37, 0x766a0abb);
- T(c, d, e, f, g, h, a, b, 38, 0x81c2c92e);
- T(b, c, d, e, f, g, h, a, 39, 0x92722c85);
- T(a, b, c, d, e, f, g, h, 40, 0xa2bfe8a1);
- T(h, a, b, c, d, e, f, g, 41, 0xa81a664b);
- T(g, h, a, b, c, d, e, f, 42, 0xc24b8b70);
- T(f, g, h, a, b, c, d, e, 43, 0xc76c51a3);
- T(e, f, g, h, a, b, c, d, 44, 0xd192e819);
- T(d, e, f, g, h, a, b, c, 45, 0xd6990624);
- T(c, d, e, f, g, h, a, b, 46, 0xf40e3585);
- T(b, c, d, e, f, g, h, a, 47, 0x106aa070);
- T(a, b, c, d, e, f, g, h, 48, 0x19a4c116);
- T(h, a, b, c, d, e, f, g, 49, 0x1e376c08);
- T(g, h, a, b, c, d, e, f, 50, 0x2748774c);
- T(f, g, h, a, b, c, d, e, 51, 0x34b0bcb5);
- T(e, f, g, h, a, b, c, d, 52, 0x391c0cb3);
- T(d, e, f, g, h, a, b, c, 53, 0x4ed8aa4a);
- T(c, d, e, f, g, h, a, b, 54, 0x5b9cca4f);
- T(b, c, d, e, f, g, h, a, 55, 0x682e6ff3);
- T(a, b, c, d, e, f, g, h, 56, 0x748f82ee);
- T(h, a, b, c, d, e, f, g, 57, 0x78a5636f);
- T(g, h, a, b, c, d, e, f, 58, 0x84c87814);
- T(f, g, h, a, b, c, d, e, 59, 0x8cc70208);
- T(e, f, g, h, a, b, c, d, 60, 0x90befffa);
- T(d, e, f, g, h, a, b, c, 61, 0xa4506ceb);
- T(c, d, e, f, g, h, a, b, 62, 0xbef9a3f7);
- T(b, c, d, e, f, g, h, a, 63, 0xc67178f2);
-
- /* --- Update the chaining variables --- */
-
- ctx->a += a;
- ctx->b += b;
- ctx->c += c;
- ctx->d += d;
- ctx->e += e;
- ctx->f += f;
- ctx->g += g;
- ctx->h += h;
-}
-
-/* --- @sha256_init@, @sha224_init@ --- *
- *
- * Arguments: @sha256_ctx *ctx@ = pointer to context block to initialize
- *
- * Returns: ---
- *
- * Use: Initializes a context block ready for hashing.
- */
-
-void sha256_init(sha256_ctx *ctx)
-{
- ctx->a = 0x6a09e667;
- ctx->b = 0xbb67ae85;
- ctx->c = 0x3c6ef372;
- ctx->d = 0xa54ff53a;
- ctx->e = 0x510e527f;
- ctx->f = 0x9b05688c;
- ctx->g = 0x1f83d9ab;
- ctx->h = 0x5be0cd19;
- ctx->off = 0;
- ctx->nl = ctx->nh = 0;
-}
-
-void sha224_init(sha256_ctx *ctx)
-{
- ctx->a = 0xc1059ed8;
- ctx->b = 0x367cd507;
- ctx->c = 0x3070dd17;
- ctx->d = 0xf70e5939;
- ctx->e = 0xffc00b31;
- ctx->f = 0x68581511;
- ctx->g = 0x64f98fa7;
- ctx->h = 0xbefa4fa4;
- ctx->off = 0;
- ctx->nl = ctx->nh = 0;
-}
-
-/* --- @sha256_set@, @sha224_set@ --- *
- *
- * Arguments: @sha256_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 sha256_set(sha256_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->f = LOAD32(p + 20);
- ctx->g = LOAD32(p + 24);
- ctx->h = LOAD32(p + 28);
- ctx->off = 0;
- ctx->nl = U32(count);
- ctx->nh = U32(((count & ~MASK32) >> 16) >> 16);
-}
-
-/* --- @sha256_hash@, @sha224_hash@ --- *
- *
- * Arguments: @sha256_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 sha256_hash(sha256_ctx *ctx, const void *buf, size_t sz)
-{
- HASH_BUFFER(SHA256, sha256, ctx, buf, sz);
-}
-
-/* --- @sha256_done, @sha224_done@ --- *
- *
- * Arguments: @sha256_ctx *ctx@ = pointer to context block
- * @void *hash@ = pointer to output buffer
- *
- * Returns: ---
- *
- * Use: Returns the hash of the data read so far.
- */
-
-static void final(sha256_ctx *ctx)
-{
- HASH_PAD(SHA256, sha256, ctx, 0x80, 0, 8);
- STORE32(ctx->buf + SHA256_BUFSZ - 8, (ctx->nl >> 29) | (ctx->nh << 3));
- STORE32(ctx->buf + SHA256_BUFSZ - 4, ctx->nl << 3);
- sha256_compress(ctx, ctx->buf);
-}
-
-void sha256_done(sha256_ctx *ctx, void *hash)
-{
- octet *p = hash;
- final(ctx);
- 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);
- STORE32(p + 20, ctx->f);
- STORE32(p + 24, ctx->g);
- STORE32(p + 28, ctx->h);
-}
-
-void sha224_done(sha224_ctx *ctx, void *hash)
-{
- octet *p = hash;
- final(ctx);
- 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);
- STORE32(p + 20, ctx->f);
- STORE32(p + 24, ctx->g);
-}
-
-/* --- @sha256_state@, @sha224_state@ --- *
- *
- * Arguments: @sha256_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 @sha256_set@.
- */
-
-unsigned long sha256_state(sha256_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);
- STORE32(p + 20, ctx->f);
- STORE32(p + 24, ctx->g);
- STORE32(p + 28, ctx->h);
- return (ctx->nl | ((ctx->nh << 16) << 16));
-}
-
-/* --- Generic interface --- */
-
-GHASH_DEF(SHA256, sha256)
-
-/* --- Test code --- */
-
-HASH_TEST(SHA256, sha256)
-
-/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff