--- /dev/null
+/*-
+ * Copyright 2005 Colin Percival
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: head/lib/libmd/sha256c.c 154479 2006-01-17 15:35:57Z phk $");
+
+#include <sys/endian.h>
+#include <sys/types.h>
+
+#include <string.h>
+
+#include "vsha256.h"
+
+#if BYTE_ORDER == BIG_ENDIAN
+
+/* Copy a vector of big-endian uint32_t into a vector of bytes */
+#define be32enc_vect(dst, src, len) \
+ memcpy((void *)dst, (const void *)src, (size_t)len)
+
+/* Copy a vector of bytes into a vector of big-endian uint32_t */
+#define be32dec_vect(dst, src, len) \
+ memcpy((void *)dst, (const void *)src, (size_t)len)
+
+#else /* BYTE_ORDER != BIG_ENDIAN */
+
+/*
+ * Encode a length len/4 vector of (uint32_t) into a length len vector of
+ * (unsigned char) in big-endian form. Assumes len is a multiple of 4.
+ */
+static void
+be32enc_vect(unsigned char *dst, const uint32_t *src, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len / 4; i++)
+ be32enc(dst + i * 4, src[i]);
+}
+
+/*
+ * Decode a big-endian length len vector of (unsigned char) into a length
+ * len/4 vector of (uint32_t). Assumes len is a multiple of 4.
+ */
+static void
+be32dec_vect(uint32_t *dst, const unsigned char *src, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len / 4; i++)
+ dst[i] = be32dec(src + i * 4);
+}
+
+#endif /* BYTE_ORDER != BIG_ENDIAN */
+
+/* Elementary functions used by SHA256 */
+#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
+#define Maj(x, y, z) ((x & (y | z)) | (y & z))
+#define SHR(x, n) (x >> n)
+#define ROTR(x, n) ((x >> n) | (x << (32 - n)))
+#define S0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
+#define S1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
+#define s0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
+#define s1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
+
+/* SHA256 round function */
+#define RND(a, b, c, d, e, f, g, h, k) \
+ t0 = h + S1(e) + Ch(e, f, g) + k; \
+ t1 = S0(a) + Maj(a, b, c); \
+ d += t0; \
+ h = t0 + t1;
+
+/* Adjusted round function for rotating state */
+#define RNDr(S, W, i, k) \
+ RND(S[(64 - i) % 8], S[(65 - i) % 8], \
+ S[(66 - i) % 8], S[(67 - i) % 8], \
+ S[(68 - i) % 8], S[(69 - i) % 8], \
+ S[(70 - i) % 8], S[(71 - i) % 8], \
+ W[i] + k)
+
+/*
+ * SHA256 block compression function. The 256-bit state is transformed via
+ * the 512-bit input block to produce a new state.
+ */
+static void
+SHA256_Transform(uint32_t * state, const unsigned char block[64])
+{
+ uint32_t W[64];
+ uint32_t S[8];
+ uint32_t t0, t1;
+ int i;
+
+ /* 1. Prepare message schedule W. */
+ be32dec_vect(W, block, 64);
+ for (i = 16; i < 64; i++)
+ W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
+
+ /* 2. Initialize working variables. */
+ memcpy(S, state, 32);
+
+ /* 3. Mix. */
+ RNDr(S, W, 0, 0x428a2f98);
+ RNDr(S, W, 1, 0x71374491);
+ RNDr(S, W, 2, 0xb5c0fbcf);
+ RNDr(S, W, 3, 0xe9b5dba5);
+ RNDr(S, W, 4, 0x3956c25b);
+ RNDr(S, W, 5, 0x59f111f1);
+ RNDr(S, W, 6, 0x923f82a4);
+ RNDr(S, W, 7, 0xab1c5ed5);
+ RNDr(S, W, 8, 0xd807aa98);
+ RNDr(S, W, 9, 0x12835b01);
+ RNDr(S, W, 10, 0x243185be);
+ RNDr(S, W, 11, 0x550c7dc3);
+ RNDr(S, W, 12, 0x72be5d74);
+ RNDr(S, W, 13, 0x80deb1fe);
+ RNDr(S, W, 14, 0x9bdc06a7);
+ RNDr(S, W, 15, 0xc19bf174);
+ RNDr(S, W, 16, 0xe49b69c1);
+ RNDr(S, W, 17, 0xefbe4786);
+ RNDr(S, W, 18, 0x0fc19dc6);
+ RNDr(S, W, 19, 0x240ca1cc);
+ RNDr(S, W, 20, 0x2de92c6f);
+ RNDr(S, W, 21, 0x4a7484aa);
+ RNDr(S, W, 22, 0x5cb0a9dc);
+ RNDr(S, W, 23, 0x76f988da);
+ RNDr(S, W, 24, 0x983e5152);
+ RNDr(S, W, 25, 0xa831c66d);
+ RNDr(S, W, 26, 0xb00327c8);
+ RNDr(S, W, 27, 0xbf597fc7);
+ RNDr(S, W, 28, 0xc6e00bf3);
+ RNDr(S, W, 29, 0xd5a79147);
+ RNDr(S, W, 30, 0x06ca6351);
+ RNDr(S, W, 31, 0x14292967);
+ RNDr(S, W, 32, 0x27b70a85);
+ RNDr(S, W, 33, 0x2e1b2138);
+ RNDr(S, W, 34, 0x4d2c6dfc);
+ RNDr(S, W, 35, 0x53380d13);
+ RNDr(S, W, 36, 0x650a7354);
+ RNDr(S, W, 37, 0x766a0abb);
+ RNDr(S, W, 38, 0x81c2c92e);
+ RNDr(S, W, 39, 0x92722c85);
+ RNDr(S, W, 40, 0xa2bfe8a1);
+ RNDr(S, W, 41, 0xa81a664b);
+ RNDr(S, W, 42, 0xc24b8b70);
+ RNDr(S, W, 43, 0xc76c51a3);
+ RNDr(S, W, 44, 0xd192e819);
+ RNDr(S, W, 45, 0xd6990624);
+ RNDr(S, W, 46, 0xf40e3585);
+ RNDr(S, W, 47, 0x106aa070);
+ RNDr(S, W, 48, 0x19a4c116);
+ RNDr(S, W, 49, 0x1e376c08);
+ RNDr(S, W, 50, 0x2748774c);
+ RNDr(S, W, 51, 0x34b0bcb5);
+ RNDr(S, W, 52, 0x391c0cb3);
+ RNDr(S, W, 53, 0x4ed8aa4a);
+ RNDr(S, W, 54, 0x5b9cca4f);
+ RNDr(S, W, 55, 0x682e6ff3);
+ RNDr(S, W, 56, 0x748f82ee);
+ RNDr(S, W, 57, 0x78a5636f);
+ RNDr(S, W, 58, 0x84c87814);
+ RNDr(S, W, 59, 0x8cc70208);
+ RNDr(S, W, 60, 0x90befffa);
+ RNDr(S, W, 61, 0xa4506ceb);
+ RNDr(S, W, 62, 0xbef9a3f7);
+ RNDr(S, W, 63, 0xc67178f2);
+
+ /* 4. Mix local working variables into global state */
+ for (i = 0; i < 8; i++)
+ state[i] += S[i];
+}
+
+static unsigned char PAD[64] = {
+ 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/* Add padding and terminating bit-count. */
+static void
+SHA256_Pad(SHA256_CTX * ctx)
+{
+ unsigned char len[8];
+ uint32_t r, plen;
+
+ /*
+ * Convert length to a vector of bytes -- we do this now rather
+ * than later because the length will change after we pad.
+ */
+ be32enc_vect(len, ctx->count, 8);
+
+ /* Add 1--64 bytes so that the resulting length is 56 mod 64 */
+ r = (ctx->count[1] >> 3) & 0x3f;
+ plen = (r < 56) ? (56 - r) : (120 - r);
+ SHA256_Update(ctx, PAD, (size_t)plen);
+
+ /* Add the terminating bit-count */
+ SHA256_Update(ctx, len, 8);
+}
+
+/* SHA-256 initialization. Begins a SHA-256 operation. */
+void
+SHA256_Init(SHA256_CTX * ctx)
+{
+
+ /* Zero bits processed so far */
+ ctx->count[0] = ctx->count[1] = 0;
+
+ /* Magic initialization constants */
+ ctx->state[0] = 0x6A09E667;
+ ctx->state[1] = 0xBB67AE85;
+ ctx->state[2] = 0x3C6EF372;
+ ctx->state[3] = 0xA54FF53A;
+ ctx->state[4] = 0x510E527F;
+ ctx->state[5] = 0x9B05688C;
+ ctx->state[6] = 0x1F83D9AB;
+ ctx->state[7] = 0x5BE0CD19;
+}
+
+/* Add bytes into the hash */
+void
+SHA256_Update(SHA256_CTX * ctx, const void *in, size_t len)
+{
+ uint32_t bitlen[2];
+ uint32_t r;
+ const unsigned char *src = in;
+
+ /* Number of bytes left in the buffer from previous updates */
+ r = (ctx->count[1] >> 3) & 0x3f;
+
+ /* Convert the length into a number of bits */
+ bitlen[1] = ((uint32_t)len) << 3;
+ bitlen[0] = (uint32_t)(len >> 29);
+
+ /* Update number of bits */
+ if ((ctx->count[1] += bitlen[1]) < bitlen[1])
+ ctx->count[0]++;
+ ctx->count[0] += bitlen[0];
+
+ /* Handle the case where we don't need to perform any transforms */
+ if (len < 64 - r) {
+ memcpy(&ctx->buf[r], src, len);
+ return;
+ }
+
+ /* Finish the current block */
+ memcpy(&ctx->buf[r], src, 64 - r);
+ SHA256_Transform(ctx->state, ctx->buf);
+ src += 64 - r;
+ len -= 64 - r;
+
+ /* Perform complete blocks */
+ while (len >= 64) {
+ SHA256_Transform(ctx->state, src);
+ src += 64;
+ len -= 64;
+ }
+
+ /* Copy left over data into buffer */
+ memcpy(ctx->buf, src, len);
+}
+
+/*
+ * SHA-256 finalization. Pads the input data, exports the hash value,
+ * and clears the context state.
+ */
+void
+SHA256_Final(unsigned char digest[32], SHA256_CTX * ctx)
+{
+
+ /* Add padding */
+ SHA256_Pad(ctx);
+
+ /* Write the hash */
+ be32enc_vect(digest, ctx->state, 32);
+
+ /* Clear the context state */
+ memset((void *)ctx, 0, sizeof(*ctx));
+}
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