Prepare SHA code to handle SHA-2 as well. For now rename files and functions

and leave av_sha1_* functions for compatibility until next major bump.

Originally committed as revision 19394 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 237 insertions, 0 deletions

diff --git a/libavutil/sha.c b/libavutil/sha.c
new file mode 100644
index 0000000000..29e4197899
--- /dev/null
+++ b/libavutil/sha.c
@@ -0,0 +1,237 @@
+/*
+ * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
+ * based on public domain SHA-1 code by Steve Reid <steve@edmweb.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "common.h"
+#include "avutil.h"
+#include "bswap.h"
+#include "sha.h"
+
+/** hash context */
+typedef struct AVSHA {
+    uint8_t  digest_len;  ///< digest length in 32-bit words
+    uint64_t count;       ///< number of bytes in buffer
+    uint8_t  buffer[64];  ///< 512-bit buffer of input values used in hash updating
+    uint32_t state[8];    ///< current hash value
+    /** function used to update hash for 512-bit input block */
+    void     (*transform)(uint32_t *state, const uint8_t buffer[64]);
+} AVSHA;
+
+const int av_sha_size = sizeof(AVSHA);
+
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
+
+/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
+#define blk0(i) (block[i] = be2me_32(((const uint32_t*)buffer)[i]))
+#define blk(i)  (block[i] = rol(block[i-3] ^ block[i-8] ^ block[i-14] ^ block[i-16], 1))
+
+#define R0(v,w,x,y,z,i) z += ((w&(x^y))^y)     + blk0(i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);
+#define R1(v,w,x,y,z,i) z += ((w&(x^y))^y)     + blk (i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);
+#define R2(v,w,x,y,z,i) z += ( w^x     ^y)     + blk (i) + 0x6ED9EBA1 + rol(v, 5); w = rol(w, 30);
+#define R3(v,w,x,y,z,i) z += (((w|x)&y)|(w&x)) + blk (i) + 0x8F1BBCDC + rol(v, 5); w = rol(w, 30);
+#define R4(v,w,x,y,z,i) z += ( w^x     ^y)     + blk (i) + 0xCA62C1D6 + rol(v, 5); w = rol(w, 30);
+
+/* Hash a single 512-bit block. This is the core of the algorithm. */
+
+static void sha1_transform(uint32_t state[5], const uint8_t buffer[64])
+{
+    uint32_t block[80];
+    unsigned int i, a, b, c, d, e;
+
+    a = state[0];
+    b = state[1];
+    c = state[2];
+    d = state[3];
+    e = state[4];
+#if CONFIG_SMALL
+    for (i = 0; i < 80; i++) {
+        int t;
+        if (i < 16)
+            t = be2me_32(((uint32_t*)buffer)[i]);
+        else
+            t = rol(block[i-3] ^ block[i-8] ^ block[i-14] ^ block[i-16], 1);
+        block[i] = t;
+        t += e + rol(a, 5);
+        if (i < 40) {
+            if (i < 20)
+                t += ((b&(c^d))^d)     + 0x5A827999;
+            else
+                t += ( b^c     ^d)     + 0x6ED9EBA1;
+        } else {
+            if (i < 60)
+                t += (((b|c)&d)|(b&c)) + 0x8F1BBCDC;
+            else
+                t += ( b^c     ^d)     + 0xCA62C1D6;
+        }
+        e = d;
+        d = c;
+        c = rol(b, 30);
+        b = a;
+        a = t;
+    }
+#else
+    for (i = 0; i < 15; i += 5) {
+        R0(a, b, c, d, e, 0 + i);
+        R0(e, a, b, c, d, 1 + i);
+        R0(d, e, a, b, c, 2 + i);
+        R0(c, d, e, a, b, 3 + i);
+        R0(b, c, d, e, a, 4 + i);
+    }
+    R0(a, b, c, d, e, 15);
+    R1(e, a, b, c, d, 16);
+    R1(d, e, a, b, c, 17);
+    R1(c, d, e, a, b, 18);
+    R1(b, c, d, e, a, 19);
+    for (i = 20; i < 40; i += 5) {
+        R2(a, b, c, d, e, 0 + i);
+        R2(e, a, b, c, d, 1 + i);
+        R2(d, e, a, b, c, 2 + i);
+        R2(c, d, e, a, b, 3 + i);
+        R2(b, c, d, e, a, 4 + i);
+    }
+    for (; i < 60; i += 5) {
+        R3(a, b, c, d, e, 0 + i);
+        R3(e, a, b, c, d, 1 + i);
+        R3(d, e, a, b, c, 2 + i);
+        R3(c, d, e, a, b, 3 + i);
+        R3(b, c, d, e, a, 4 + i);
+    }
+    for (; i < 80; i += 5) {
+        R4(a, b, c, d, e, 0 + i);
+        R4(e, a, b, c, d, 1 + i);
+        R4(d, e, a, b, c, 2 + i);
+        R4(c, d, e, a, b, 3 + i);
+        R4(b, c, d, e, a, 4 + i);
+    }
+#endif
+    state[0] += a;
+    state[1] += b;
+    state[2] += c;
+    state[3] += d;
+    state[4] += e;
+}
+
+int av_sha_init(AVSHA* ctx, int bits)
+{
+    ctx->state[0] = 0x67452301;
+    ctx->state[1] = 0xEFCDAB89;
+    ctx->state[2] = 0x98BADCFE;
+    ctx->state[3] = 0x10325476;
+    ctx->state[4] = 0xC3D2E1F0;
+    ctx->transform = sha1_transform;
+    ctx->count    = 0;
+    return 0;
+}
+
+void av_sha_update(AVSHA* ctx, const uint8_t* data, unsigned int len)
+{
+    unsigned int i, j;
+
+    j = ctx->count & 63;
+    ctx->count += len;
+#if CONFIG_SMALL
+    for (i = 0; i < len; i++) {
+        ctx->buffer[j++] = data[i];
+        if (64 == j) {
+            ctx->transform(ctx->state, ctx->buffer);
+            j = 0;
+        }
+    }
+#else
+    if ((j + len) > 63) {
+        memcpy(&ctx->buffer[j], data, (i = 64 - j));
+        ctx->transform(ctx->state, ctx->buffer);
+        for (; i + 63 < len; i += 64)
+            ctx->transform(ctx->state, &data[i]);
+        j = 0;
+    } else
+        i = 0;
+    memcpy(&ctx->buffer[j], &data[i], len - i);
+#endif
+}
+
+void av_sha_final(AVSHA* ctx, uint8_t *digest)
+{
+    int i;
+    uint64_t finalcount = be2me_64(ctx->count << 3);
+
+    av_sha_update(ctx, "\200", 1);
+    while ((ctx->count & 63) != 56)
+        av_sha_update(ctx, "", 1);
+    av_sha_update(ctx, (uint8_t *)&finalcount, 8); /* Should cause a transform() */
+    for (i = 0; i < 5; i++)
+        ((uint32_t*)digest)[i] = be2me_32(ctx->state[i]);
+}
+
+#if LIBAVUTIL_VERSION_MAJOR < 51
+struct AVSHA1 {
+    AVSHA sha;
+};
+
+const int av_sha1_size = sizeof(struct AVSHA1);
+
+void av_sha1_init(struct AVSHA1* context)
+{
+    av_sha_init(&context->sha, 160);
+}
+
+void av_sha1_update(struct AVSHA1* context, const uint8_t* data, unsigned int len)
+{
+    av_sha_update(&context->sha, data, len);
+}
+
+void av_sha1_final(struct AVSHA1* context, uint8_t digest[20])
+{
+    av_sha_final(&context->sha, digest);
+}
+#endif
+
+#ifdef TEST
+#include <stdio.h>
+#undef printf
+
+int main(void)
+{
+    int i, k;
+    AVSHA ctx;
+    unsigned char digest[20];
+
+    for (k = 0; k < 3; k++) {
+        av_sha_init(&ctx, 160);
+        if (k == 0)
+            av_sha_update(&ctx, "abc", 3);
+        else if (k == 1)
+            av_sha_update(&ctx, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56);
+        else
+            for (i = 0; i < 1000*1000; i++)
+                av_sha_update(&ctx, "a", 1);
+        av_sha_final(&ctx, digest);
+        for (i = 0; i < 20; i++)
+            printf("%02X", digest[i]);
+        putchar('\n');
+    }
+    //test vectors (from FIPS PUB 180-1)
+    printf("A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D\n"
+           "84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1\n"
+           "34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F\n");
+
+    return 0;
+}
+#endif