Add BSD sha256 implementation

  from ogay/sha2@b90991f

Author: pennam

src/sha256/sha256.c

@@ -0,0 +1,347 @@
+/*
+ * FIPS 180-2 256 implementation based on code by Oliver Gay
+ * under a BSD-style license. http://ouah.org/ogay/sha2/
+ *
+ * Copyright (C) 2005-2023 Olivier Gay <olivier.gay@a3.epfl.ch>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if 0
+#define UNROLL_LOOPS /* Enable loops unrolling */
+#endif
+
+#include "sha256.h"
+
+#define SHFR(x, n)    (x >> n)
+#define ROTR(x, n)   ((x >> n) | (x << ((sizeof (x) << 3) - n)))
+#define ROTL(x, n)   ((x << n) | (x >> ((sizeof (x) << 3) - n)))
+#define CH(x, y, z)  ((x & y) ^ (~x & z))
+#define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
+
+#define SHA256_F1(x) (ROTR(x,  2) ^ ROTR(x, 13) ^ ROTR(x, 22))
+#define SHA256_F2(x) (ROTR(x,  6) ^ ROTR(x, 11) ^ ROTR(x, 25))
+#define SHA256_F3(x) (ROTR(x,  7) ^ ROTR(x, 18) ^ SHFR(x,  3))
+#define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
+
+#define UNPACK32(x, str)                        \
+{                                               \
+    *((str) + 3) = (uint8_t) ((x)      );       \
+    *((str) + 2) = (uint8_t) ((x) >>  8);       \
+    *((str) + 1) = (uint8_t) ((x) >> 16);       \
+    *((str) + 0) = (uint8_t) ((x) >> 24);       \
+}
+
+#define PACK32(str, x)                          \
+{                                               \
+    *(x) =   ((uint32_t) *((str) + 3)      )    \
+           | ((uint32_t) *((str) + 2) <<  8)    \
+           | ((uint32_t) *((str) + 1) << 16)    \
+           | ((uint32_t) *((str) + 0) << 24);   \
+}
+
+#define UNPACK64(x, str)                        \
+{                                               \
+    *((str) + 7) = (uint8_t) ((x)      );       \
+    *((str) + 6) = (uint8_t) ((x) >>  8);       \
+    *((str) + 5) = (uint8_t) ((x) >> 16);       \
+    *((str) + 4) = (uint8_t) ((x) >> 24);       \
+    *((str) + 3) = (uint8_t) ((x) >> 32);       \
+    *((str) + 2) = (uint8_t) ((x) >> 40);       \
+    *((str) + 1) = (uint8_t) ((x) >> 48);       \
+    *((str) + 0) = (uint8_t) ((x) >> 56);       \
+}
+
+#define PACK64(str, x)                          \
+{                                               \
+    *(x) =   ((uint64_t) *((str) + 7)      )    \
+           | ((uint64_t) *((str) + 6) <<  8)    \
+           | ((uint64_t) *((str) + 5) << 16)    \
+           | ((uint64_t) *((str) + 4) << 24)    \
+           | ((uint64_t) *((str) + 3) << 32)    \
+           | ((uint64_t) *((str) + 2) << 40)    \
+           | ((uint64_t) *((str) + 1) << 48)    \
+           | ((uint64_t) *((str) + 0) << 56);   \
+}
+
+/* Macros used for loops unrolling */
+
+#define SHA256_SCR(i)                         \
+{                                             \
+    w[i] =  SHA256_F4(w[i -  2]) + w[i -  7]  \
+          + SHA256_F3(w[i - 15]) + w[i - 16]; \
+}
+
+#define SHA256_EXP(a, b, c, d, e, f, g, h, j)               \
+{                                                           \
+    t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) \
+         + sha256_k[j] + w[j];                              \
+    t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]);       \
+    wv[d] += t1;                                            \
+    wv[h] = t1 + t2;                                        \
+}
+
+static const uint32_t sha256_h0[8] =
+            {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
+             0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
+
+static const uint32_t sha256_k[64] =
+            {0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
+             0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+             0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+             0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+             0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+             0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+             0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
+             0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+             0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+             0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+             0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
+             0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+             0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
+             0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+             0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+             0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
+
+/* SHA-2 internal function */
+
+static void sha256_transf(sha256_ctx *ctx, const uint8_t *message,
+    uint64_t block_nb)
+{
+    uint32_t w[64];
+    uint32_t wv[8];
+    uint32_t t1, t2;
+    const uint8_t *sub_block;
+    uint64_t i;
+
+#ifndef UNROLL_LOOPS
+    int j;
+#endif
+
+    for (i = 0; i < block_nb; i++) {
+        sub_block = message + (i << 6);
+
+#ifndef UNROLL_LOOPS
+        for (j = 0; j < 16; j++) {
+            PACK32(&sub_block[j << 2], &w[j]);
+        }
+
+        for (j = 16; j < 64; j++) {
+            SHA256_SCR(j);
+        }
+
+        for (j = 0; j < 8; j++) {
+            wv[j] = ctx->h[j];
+        }
+
+        for (j = 0; j < 64; j++) {
+            t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6])
+                + sha256_k[j] + w[j];
+            t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
+            wv[7] = wv[6];
+            wv[6] = wv[5];
+            wv[5] = wv[4];
+            wv[4] = wv[3] + t1;
+            wv[3] = wv[2];
+            wv[2] = wv[1];
+            wv[1] = wv[0];
+            wv[0] = t1 + t2;
+        }
+
+        for (j = 0; j < 8; j++) {
+            ctx->h[j] += wv[j];
+        }
+#else
+        PACK32(&sub_block[ 0], &w[ 0]); PACK32(&sub_block[ 4], &w[ 1]);
+        PACK32(&sub_block[ 8], &w[ 2]); PACK32(&sub_block[12], &w[ 3]);
+        PACK32(&sub_block[16], &w[ 4]); PACK32(&sub_block[20], &w[ 5]);
+        PACK32(&sub_block[24], &w[ 6]); PACK32(&sub_block[28], &w[ 7]);
+        PACK32(&sub_block[32], &w[ 8]); PACK32(&sub_block[36], &w[ 9]);
+        PACK32(&sub_block[40], &w[10]); PACK32(&sub_block[44], &w[11]);
+        PACK32(&sub_block[48], &w[12]); PACK32(&sub_block[52], &w[13]);
+        PACK32(&sub_block[56], &w[14]); PACK32(&sub_block[60], &w[15]);
+
+        SHA256_SCR(16); SHA256_SCR(17); SHA256_SCR(18); SHA256_SCR(19);
+        SHA256_SCR(20); SHA256_SCR(21); SHA256_SCR(22); SHA256_SCR(23);
+        SHA256_SCR(24); SHA256_SCR(25); SHA256_SCR(26); SHA256_SCR(27);
+        SHA256_SCR(28); SHA256_SCR(29); SHA256_SCR(30); SHA256_SCR(31);
+        SHA256_SCR(32); SHA256_SCR(33); SHA256_SCR(34); SHA256_SCR(35);
+        SHA256_SCR(36); SHA256_SCR(37); SHA256_SCR(38); SHA256_SCR(39);
+        SHA256_SCR(40); SHA256_SCR(41); SHA256_SCR(42); SHA256_SCR(43);
+        SHA256_SCR(44); SHA256_SCR(45); SHA256_SCR(46); SHA256_SCR(47);
+        SHA256_SCR(48); SHA256_SCR(49); SHA256_SCR(50); SHA256_SCR(51);
+        SHA256_SCR(52); SHA256_SCR(53); SHA256_SCR(54); SHA256_SCR(55);
+        SHA256_SCR(56); SHA256_SCR(57); SHA256_SCR(58); SHA256_SCR(59);
+        SHA256_SCR(60); SHA256_SCR(61); SHA256_SCR(62); SHA256_SCR(63);
+
+        wv[0] = ctx->h[0]; wv[1] = ctx->h[1];
+        wv[2] = ctx->h[2]; wv[3] = ctx->h[3];
+        wv[4] = ctx->h[4]; wv[5] = ctx->h[5];
+        wv[6] = ctx->h[6]; wv[7] = ctx->h[7];
+
+        SHA256_EXP(0,1,2,3,4,5,6,7, 0); SHA256_EXP(7,0,1,2,3,4,5,6, 1);
+        SHA256_EXP(6,7,0,1,2,3,4,5, 2); SHA256_EXP(5,6,7,0,1,2,3,4, 3);
+        SHA256_EXP(4,5,6,7,0,1,2,3, 4); SHA256_EXP(3,4,5,6,7,0,1,2, 5);
+        SHA256_EXP(2,3,4,5,6,7,0,1, 6); SHA256_EXP(1,2,3,4,5,6,7,0, 7);
+        SHA256_EXP(0,1,2,3,4,5,6,7, 8); SHA256_EXP(7,0,1,2,3,4,5,6, 9);
+        SHA256_EXP(6,7,0,1,2,3,4,5,10); SHA256_EXP(5,6,7,0,1,2,3,4,11);
+        SHA256_EXP(4,5,6,7,0,1,2,3,12); SHA256_EXP(3,4,5,6,7,0,1,2,13);
+        SHA256_EXP(2,3,4,5,6,7,0,1,14); SHA256_EXP(1,2,3,4,5,6,7,0,15);
+        SHA256_EXP(0,1,2,3,4,5,6,7,16); SHA256_EXP(7,0,1,2,3,4,5,6,17);
+        SHA256_EXP(6,7,0,1,2,3,4,5,18); SHA256_EXP(5,6,7,0,1,2,3,4,19);
+        SHA256_EXP(4,5,6,7,0,1,2,3,20); SHA256_EXP(3,4,5,6,7,0,1,2,21);
+        SHA256_EXP(2,3,4,5,6,7,0,1,22); SHA256_EXP(1,2,3,4,5,6,7,0,23);
+        SHA256_EXP(0,1,2,3,4,5,6,7,24); SHA256_EXP(7,0,1,2,3,4,5,6,25);
+        SHA256_EXP(6,7,0,1,2,3,4,5,26); SHA256_EXP(5,6,7,0,1,2,3,4,27);
+        SHA256_EXP(4,5,6,7,0,1,2,3,28); SHA256_EXP(3,4,5,6,7,0,1,2,29);
+        SHA256_EXP(2,3,4,5,6,7,0,1,30); SHA256_EXP(1,2,3,4,5,6,7,0,31);
+        SHA256_EXP(0,1,2,3,4,5,6,7,32); SHA256_EXP(7,0,1,2,3,4,5,6,33);
+        SHA256_EXP(6,7,0,1,2,3,4,5,34); SHA256_EXP(5,6,7,0,1,2,3,4,35);
+        SHA256_EXP(4,5,6,7,0,1,2,3,36); SHA256_EXP(3,4,5,6,7,0,1,2,37);
+        SHA256_EXP(2,3,4,5,6,7,0,1,38); SHA256_EXP(1,2,3,4,5,6,7,0,39);
+        SHA256_EXP(0,1,2,3,4,5,6,7,40); SHA256_EXP(7,0,1,2,3,4,5,6,41);
+        SHA256_EXP(6,7,0,1,2,3,4,5,42); SHA256_EXP(5,6,7,0,1,2,3,4,43);
+        SHA256_EXP(4,5,6,7,0,1,2,3,44); SHA256_EXP(3,4,5,6,7,0,1,2,45);
+        SHA256_EXP(2,3,4,5,6,7,0,1,46); SHA256_EXP(1,2,3,4,5,6,7,0,47);
+        SHA256_EXP(0,1,2,3,4,5,6,7,48); SHA256_EXP(7,0,1,2,3,4,5,6,49);
+        SHA256_EXP(6,7,0,1,2,3,4,5,50); SHA256_EXP(5,6,7,0,1,2,3,4,51);
+        SHA256_EXP(4,5,6,7,0,1,2,3,52); SHA256_EXP(3,4,5,6,7,0,1,2,53);
+        SHA256_EXP(2,3,4,5,6,7,0,1,54); SHA256_EXP(1,2,3,4,5,6,7,0,55);
+        SHA256_EXP(0,1,2,3,4,5,6,7,56); SHA256_EXP(7,0,1,2,3,4,5,6,57);
+        SHA256_EXP(6,7,0,1,2,3,4,5,58); SHA256_EXP(5,6,7,0,1,2,3,4,59);
+        SHA256_EXP(4,5,6,7,0,1,2,3,60); SHA256_EXP(3,4,5,6,7,0,1,2,61);
+        SHA256_EXP(2,3,4,5,6,7,0,1,62); SHA256_EXP(1,2,3,4,5,6,7,0,63);
+
+        ctx->h[0] += wv[0]; ctx->h[1] += wv[1];
+        ctx->h[2] += wv[2]; ctx->h[3] += wv[3];
+        ctx->h[4] += wv[4]; ctx->h[5] += wv[5];
+        ctx->h[6] += wv[6]; ctx->h[7] += wv[7];
+#endif /* !UNROLL_LOOPS */
+    }
+}
+
+/* SHA-256 functions */
+
+void sha256(const uint8_t *message, uint64_t len, uint8_t *digest)
+{
+    sha256_ctx ctx;
+
+    sha256_init(&ctx);
+    sha256_update(&ctx, message, len);
+    sha256_final(&ctx, digest);
+}
+
+void sha256_init(sha256_ctx *ctx)
+{
+#ifndef UNROLL_LOOPS
+    int i;
+    for (i = 0; i < 8; i++) {
+        ctx->h[i] = sha256_h0[i];
+    }
+#else
+    ctx->h[0] = sha256_h0[0]; ctx->h[1] = sha256_h0[1];
+    ctx->h[2] = sha256_h0[2]; ctx->h[3] = sha256_h0[3];
+    ctx->h[4] = sha256_h0[4]; ctx->h[5] = sha256_h0[5];
+    ctx->h[6] = sha256_h0[6]; ctx->h[7] = sha256_h0[7];
+#endif /* !UNROLL_LOOPS */
+
+    ctx->len = 0;
+    ctx->tot_len = 0;
+}
+
+void sha256_update(sha256_ctx *ctx, const uint8_t *message, uint64_t len)
+{
+    uint64_t block_nb;
+    uint64_t new_len, rem_len, tmp_len;
+    const uint8_t *shifted_message;
+
+    tmp_len = SHA256_BLOCK_SIZE - ctx->len;
+    rem_len = len < tmp_len ? len : tmp_len;
+
+    memcpy(&ctx->block[ctx->len], message, rem_len);
+
+    if (ctx->len + len < SHA256_BLOCK_SIZE) {
+        ctx->len += len;
+        return;
+    }
+
+    new_len = len - rem_len;
+    block_nb = new_len / SHA256_BLOCK_SIZE;
+
+    shifted_message = message + rem_len;
+
+    sha256_transf(ctx, ctx->block, 1);
+    sha256_transf(ctx, shifted_message, block_nb);
+
+    rem_len = new_len % SHA256_BLOCK_SIZE;
+
+    memcpy(ctx->block, &shifted_message[block_nb << 6], rem_len);
+
+    ctx->len = rem_len;
+    ctx->tot_len += (block_nb + 1) << 6;
+}
+
+void sha256_final(sha256_ctx *ctx, uint8_t *digest)
+{
+    uint64_t block_nb;
+    uint64_t pm_len;
+    uint64_t len_b;
+    uint64_t tot_len;
+
+#ifndef UNROLL_LOOPS
+    int i;
+#endif
+
+    block_nb = (1 + ((SHA256_BLOCK_SIZE - 9)
+                     < (ctx->len % SHA256_BLOCK_SIZE)));
+
+    tot_len = ctx->tot_len + ctx->len;
+    ctx->tot_len = tot_len;
+
+    len_b = tot_len << 3;
+    pm_len = block_nb << 6;
+
+    memset(ctx->block + ctx->len, 0, pm_len - ctx->len);
+    ctx->block[ctx->len] = 0x80;
+    UNPACK64(len_b, ctx->block + pm_len - 8);
+
+    sha256_transf(ctx, ctx->block, block_nb);
+
+#ifndef UNROLL_LOOPS
+    for (i = 0 ; i < 8; i++) {
+        UNPACK32(ctx->h[i], &digest[i << 2]);
+    }
+#else
+   UNPACK32(ctx->h[0], &digest[ 0]);
+   UNPACK32(ctx->h[1], &digest[ 4]);
+   UNPACK32(ctx->h[2], &digest[ 8]);
+   UNPACK32(ctx->h[3], &digest[12]);
+   UNPACK32(ctx->h[4], &digest[16]);
+   UNPACK32(ctx->h[5], &digest[20]);
+   UNPACK32(ctx->h[6], &digest[24]);
+   UNPACK32(ctx->h[7], &digest[28]);
+#endif /* !UNROLL_LOOPS */
+}