--- /dev/null
+/* -*-c-*-
+ *
+ * $Id: sha256.c,v 1.1 2000/10/15 17:48:14 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.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: sha256.c,v $
+ * Revision 1.1 2000/10/15 17:48:14 mdw
+ * New SHA variants with longer outputs.
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/bits.h>
+
+#include "ghash.h"
+#include "ghash-def.h"
+#include "hash.h"
+#include "sha256.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @sha256_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@ --- *
+ *
+ * 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;
+}
+
+/* --- @sha256_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@ --- *
+ *
+ * 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@ --- *
+ *
+ * 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.
+ */
+
+void sha256_done(sha256_ctx *ctx, void *hash)
+{
+ octet *p = hash;
+ 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);
+ 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);
+}
+
+/* --- @sha256_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