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/*
* Based on the Mozilla SHA1 (see mozilla-sha1/sha1.c),
* optimized to do word accesses rather than byte accesses,
* and to avoid unnecessary copies into the context array.
*/
#include <string.h>
#include <arpa/inet.h>
#include "sha1.h"
/* Hash one 64-byte block of data */
static void blk_SHA1Block(blk_SHA_CTX *ctx, const unsigned int *data);
void blk_SHA1_Init(blk_SHA_CTX *ctx)
{
ctx->lenW = 0;
ctx->size = 0;
/* Initialize H with the magic constants (see FIPS180 for constants)
*/
ctx->H[0] = 0x67452301;
ctx->H[1] = 0xefcdab89;
ctx->H[2] = 0x98badcfe;
ctx->H[3] = 0x10325476;
ctx->H[4] = 0xc3d2e1f0;
}
void blk_SHA1_Update(blk_SHA_CTX *ctx, const void *data, unsigned long len)
{
int lenW = ctx->lenW;
ctx->size += len;
/* Read the data into W and process blocks as they get full
*/
if (lenW) {
int left = 64 - lenW;
if (len < left)
left = len;
memcpy(lenW + (char *)ctx->W, data, left);
lenW = (lenW + left) & 63;
len -= left;
data += left;
ctx->lenW = lenW;
if (lenW)
return;
blk_SHA1Block(ctx, ctx->W);
}
while (len >= 64) {
blk_SHA1Block(ctx, data);
data += 64;
len -= 64;
}
if (len) {
memcpy(ctx->W, data, len);
ctx->lenW = len;
}
}
void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx)
{
static const unsigned char pad[64] = { 0x80 };
unsigned int padlen[2];
int i;
/* Pad with a binary 1 (ie 0x80), then zeroes, then length
*/
padlen[0] = htonl(ctx->size >> (32 - 3));
padlen[1] = htonl(ctx->size << 3);
blk_SHA1_Update(ctx, pad, 1+ (63 & (55 - ctx->lenW)));
blk_SHA1_Update(ctx, padlen, 8);
/* Output hash
*/
for (i = 0; i < 5; i++)
((unsigned int *)hashout)[i] = htonl(ctx->H[i]);
}
#define SHA_ROT(X,n) (((X) << (n)) | ((X) >> (32-(n))))
static void blk_SHA1Block(blk_SHA_CTX *ctx, const unsigned int *data)
{
int t;
unsigned int A,B,C,D,E,TEMP;
unsigned int W[80];
for (t = 0; t < 16; t++)
W[t] = htonl(data[t]);
/* Unroll it? */
for (t = 16; t <= 79; t++)
W[t] = SHA_ROT(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1);
A = ctx->H[0];
B = ctx->H[1];
C = ctx->H[2];
D = ctx->H[3];
E = ctx->H[4];
#define T_0_19(t) \
TEMP = SHA_ROT(A,5) + (((C^D)&B)^D) + E + W[t] + 0x5a827999; \
E = D; D = C; C = SHA_ROT(B, 30); B = A; A = TEMP;
T_0_19( 0); T_0_19( 1); T_0_19( 2); T_0_19( 3); T_0_19( 4);
T_0_19( 5); T_0_19( 6); T_0_19( 7); T_0_19( 8); T_0_19( 9);
T_0_19(10); T_0_19(11); T_0_19(12); T_0_19(13); T_0_19(14);
T_0_19(15); T_0_19(16); T_0_19(17); T_0_19(18); T_0_19(19);
#define T_20_39(t) \
TEMP = SHA_ROT(A,5) + (B^C^D) + E + W[t] + 0x6ed9eba1; \
E = D; D = C; C = SHA_ROT(B, 30); B = A; A = TEMP;
T_20_39(20); T_20_39(21); T_20_39(22); T_20_39(23); T_20_39(24);
T_20_39(25); T_20_39(26); T_20_39(27); T_20_39(28); T_20_39(29);
T_20_39(30); T_20_39(31); T_20_39(32); T_20_39(33); T_20_39(34);
T_20_39(35); T_20_39(36); T_20_39(37); T_20_39(38); T_20_39(39);
#define T_40_59(t) \
TEMP = SHA_ROT(A,5) + ((B&C)|(D&(B|C))) + E + W[t] + 0x8f1bbcdc; \
E = D; D = C; C = SHA_ROT(B, 30); B = A; A = TEMP;
T_40_59(40); T_40_59(41); T_40_59(42); T_40_59(43); T_40_59(44);
T_40_59(45); T_40_59(46); T_40_59(47); T_40_59(48); T_40_59(49);
T_40_59(50); T_40_59(51); T_40_59(52); T_40_59(53); T_40_59(54);
T_40_59(55); T_40_59(56); T_40_59(57); T_40_59(58); T_40_59(59);
#define T_60_79(t) \
TEMP = SHA_ROT(A,5) + (B^C^D) + E + W[t] + 0xca62c1d6; \
E = D; D = C; C = SHA_ROT(B, 30); B = A; A = TEMP;
T_60_79(60); T_60_79(61); T_60_79(62); T_60_79(63); T_60_79(64);
T_60_79(65); T_60_79(66); T_60_79(67); T_60_79(68); T_60_79(69);
T_60_79(70); T_60_79(71); T_60_79(72); T_60_79(73); T_60_79(74);
T_60_79(75); T_60_79(76); T_60_79(77); T_60_79(78); T_60_79(79);
ctx->H[0] += A;
ctx->H[1] += B;
ctx->H[2] += C;
ctx->H[3] += D;
ctx->H[4] += E;
}
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