/*
* Calcurse - text-based organizer
*
* Copyright (c) 2004-2012 calcurse Development Team <misc@calcurse.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* - 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 COPYRIGHT HOLDERS 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 COPYRIGHT
* OWNER 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.
*
* Send your feedback or comments to : misc@calcurse.org
* Calcurse home page : http://calcurse.org
*
* This code is based on Steve Reid's public domain SHA1 implementation.
*
* The original version is available at:
* ftp://ftp.funet.fi/pub/crypt/hash/sha/sha1.c
*
*/
#include <stdio.h>
#include <string.h>
#include "sha1.h"
#define rol(val, n) (((val) << (n)) | ((val) >> (32 - (n))))
#ifdef WORDS_BIGENDIAN
#define blk0(i) block->l[i]
#else
#define blk0(i) (block->l[i] = (rol (block->l[i], 24) & \
(uint32_t)0xFF00FF00) | (rol (block->l[i], 8) & (uint32_t)0x00FF00FF))
#endif
#define blk(i) (block->l[i & 15] = rol (block->l[(i + 13) & 15] ^ \
block->l[(i + 8) & 15] ^ block->l[(i + 2) & 15] ^ block->l[i & 15], 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);
void
sha1_transform (uint32_t state[5], const uint8_t buffer[64])
{
typedef union {
uint8_t c[64];
uint32_t l[16];
} b64_t;
b64_t *block = (b64_t *)buffer;
uint32_t a = state[0];
uint32_t b = state[1];
uint32_t c = state[2];
uint32_t d = state[3];
uint32_t e = state[4];
R0 (a, b, c, d, e, 0); R0 (e, a, b, c, d, 1);
R0 (d, e, a, b, c, 2); R0 (c, d, e, a, b, 3);
R0 (b, c, d, e, a, 4); R0 (a, b, c, d, e, 5);
R0 (e, a, b, c, d, 6); R0 (d, e, a, b, c, 7);
R0 (c, d, e, a, b, 8); R0 (b, c, d, e, a, 9);
R0 (a, b, c, d, e, 10); R0 (e, a, b, c, d, 11);
R0 (d, e, a, b, c, 12); R0 (c, d, e, a, b, 13);
R0 (b, c, d, e, a, 14); 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);
R2 (a, b, c, d, e, 20); R2 (e, a, b, c, d, 21);
R2 (d, e, a, b, c, 22); R2 (c, d, e, a, b, 23);
R2 (b, c, d, e, a, 24); R2 (a, b, c, d, e, 25);
R2 (e, a, b, c, d, 26); R2 (d, e, a, b, c, 27);
R2 (c, d, e, a, b, 28); R2 (b, c, d, e, a, 29);
R2 (a, b, c, d, e, 30); R2 (e, a, b, c, d, 31);
R2 (d, e, a, b, c, 32); R2 (c, d, e, a, b, 33);
R2 (b, c, d, e, a, 34); R2 (a, b, c, d, e, 35);
R2 (e, a, b, c, d, 36); R2 (d, e, a, b, c, 37);
R2 (c, d, e, a, b, 38); R2 (b, c, d, e, a, 39);
R3 (a, b, c, d, e, 40); R3 (e, a, b, c, d, 41);
R3 (d, e, a, b, c, 42); R3 (c, d, e, a, b, 43);
R3 (b, c, d, e, a, 44); R3 (a, b, c, d, e, 45);
R3 (e, a, b, c, d, 46); R3 (d, e, a, b, c, 47);
R3 (c, d, e, a, b, 48); R3 (b, c, d, e, a, 49);
R3 (a, b, c, d, e, 50); R3 (e, a, b, c, d, 51);
R3 (d, e, a, b, c, 52); R3 (c, d, e, a, b, 53);
R3 (b, c, d, e, a, 54); R3 (a, b, c, d, e, 55);
R3 (e, a, b, c, d, 56); R3 (d, e, a, b, c, 57);
R3 (c, d, e, a, b, 58); R3 (b, c, d, e, a, 59);
R4 (a, b, c, d, e, 60); R4 (e, a, b, c, d, 61);
R4 (d, e, a, b, c, 62); R4 (c, d, e, a, b, 63);
R4 (b, c, d, e, a, 64); R4 (a, b, c, d, e, 65);
R4 (e, a, b, c, d, 66); R4 (d, e, a, b, c, 67);
R4 (c, d, e, a, b, 68); R4 (b, c, d, e, a, 69);
R4 (a, b, c, d, e, 70); R4 (e, a, b, c, d, 71);
R4 (d, e, a, b, c, 72); R4 (c, d, e, a, b, 73);
R4 (b, c, d, e, a, 74); R4 (a, b, c, d, e, 75);
R4 (e, a, b, c, d, 76); R4 (d, e, a, b, c, 77);
R4 (c, d, e, a, b, 78); R4 (b, c, d, e, a, 79);
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
a = b = c = d = e = 0;
}
void
sha1_init (sha1_ctx_t *ctx)
{
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->state[4] = 0xC3D2E1F0;
ctx->count[0] = ctx->count[1] = 0;
}
void
sha1_update (sha1_ctx_t *ctx, const uint8_t *data, unsigned int len)
{
unsigned int i, j;
j = (ctx->count[0] >> 3) & 63;
if ((ctx->count[0] += len << 3) < (len << 3))
ctx->count[1]++;
ctx->count[1] += (len >> 29);
if (j + len > 63)
{
memcpy (&ctx->buffer[j], data, (i = 64 - j));
sha1_transform (ctx->state, ctx->buffer);
for (; i + 63 < len; i += 64)
sha1_transform (ctx->state, &data[i]);
j = 0;
}
else
i = 0;
memcpy (&ctx->buffer[j], &data[i], len - i);
}
void
sha1_final (sha1_ctx_t *ctx, uint8_t digest[SHA1_DIGESTLEN])
{
uint32_t i, j;
uint8_t finalcount[8];
for (i = 0; i < 8; i++)
{
finalcount[i] = (uint8_t)((ctx->count[(i >= 4 ? 0 : 1)] >>
((3 - (i & 3)) * 8)) & 255);
}
sha1_update (ctx, (uint8_t *)"\200", 1);
while ((ctx->count[0] & 504) != 448)
sha1_update (ctx, (uint8_t *)"\0", 1);
sha1_update (ctx, finalcount, 8);
for (i = 0; i < SHA1_DIGESTLEN; i++)
digest[i] = (uint8_t)((ctx->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
i = j = 0;
memset (ctx->buffer, 0, SHA1_BLOCKLEN);
memset (ctx->state, 0, SHA1_DIGESTLEN);
memset (ctx->count, 0, 8);
memset (&finalcount, 0, 8);
}
void
sha1_digest (const char *data, char *buffer)
{
sha1_ctx_t ctx;
uint8_t digest[SHA1_DIGESTLEN];
int i;
sha1_init (&ctx);
sha1_update (&ctx, (const uint8_t *)data, strlen (data));
sha1_final (&ctx, (uint8_t *)digest);
for (i = 0; i < SHA1_DIGESTLEN; i++)
{
snprintf (buffer, 3, "%02x", digest[i]);
buffer += sizeof (char) * 2;
}
}
void
sha1_stream (FILE *fp, char *buffer)
{
sha1_ctx_t ctx;
uint8_t data[BUFSIZ];
size_t bytes_read;
uint8_t digest[SHA1_DIGESTLEN];
int i;
sha1_init (&ctx);
while (!feof (fp))
{
bytes_read = fread (data, 1, BUFSIZ, fp);
sha1_update (&ctx, data, bytes_read);
}
sha1_final (&ctx, (uint8_t *)digest);
for (i = 0; i < SHA1_DIGESTLEN; i++)
{
snprintf (buffer, 3, "%02x", digest[i]);
buffer += sizeof (char) * 2;
}
}
