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/*
SHA-1 in C
By Steve Reid <steve@edmweb.com>.
Small changes to make it fit by Bruce Guenter <bruce@untroubled.org>
100% Public Domain.
Test Vectors (from FIPS PUB 180-1)
"abc"
A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
A million repetitions of "a"
34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
*/
#include <string.h>
#include "sha1.h"
#include "uint32.h"
#include "uint64.h"
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
/* blk0() and blk() perform the initial expand. */
/* I got the idea of expanding during the round function from SSLeay */
#ifdef ENDIAN_MSB
# define blk0(i) block->l[i]
#else
# define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
|(rol(block->l[i],8)&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))
/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
#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. */
void SHA1Transform(uint32 state[5], const unsigned char buffer[SHA1_BLOCK_LENGTH])
{
uint32 a, b, c, d, e;
typedef union {
unsigned char c[64];
uint32 l[16];
} CHAR64LONG16;
CHAR64LONG16 block[1]; /* use array to appear as a pointer */
memcpy(block, buffer, SHA1_BLOCK_LENGTH);
/* Copy context->state[] to working vars */
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
/* 4 rounds of 20 operations each. Loop unrolled. */
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);
/* Add the working vars back into context.state[] */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
/* Wipe variables */
a = b = c = d = e = 0;
#ifdef SHA1HANDSOFF
memset(block, '\0', sizeof(block));
#endif
}
/* SHA1Init - Initialize new context */
void SHA1Init(SHA1_CTX* context)
{
/* SHA1 initialization constants */
context->state[0] = 0x67452301;
context->state[1] = 0xEFCDAB89;
context->state[2] = 0x98BADCFE;
context->state[3] = 0x10325476;
context->state[4] = 0xC3D2E1F0;
context->bytes = 0;
}
/* Run your data through this. */
void SHA1Update(SHA1_CTX* context, const unsigned char* data, uint32 len)
{
unsigned blen = context->bytes % SHA1_BLOCK_LENGTH;
unsigned use;
context->bytes += len;
if (blen > 0 && len >= (use = SHA1_BLOCK_LENGTH - blen)) {
memcpy(context->buffer + blen, data, use);
SHA1Transform(context->state, context->buffer);
blen = 0;
len -= use;
data += use;
}
while (len >= SHA1_BLOCK_LENGTH) {
SHA1Transform(context->state, data);
len -= SHA1_BLOCK_LENGTH;
data += SHA1_BLOCK_LENGTH;
}
memcpy(context->buffer + blen, data, len);
}
/* Add padding and return the message digest. */
void SHA1Final(SHA1_CTX* context, unsigned char digest[SHA1_DIGEST_LENGTH])
{
unsigned i;
unsigned blen = context->bytes % SHA1_BLOCK_LENGTH;
context->buffer[blen++] = 0x80;
memset(context->buffer + blen, 0, SHA1_BLOCK_LENGTH - blen);
if (blen > SHA1_BLOCK_LENGTH-8) {
SHA1Transform(context->state, context->buffer);
memset(context->buffer, 0, SHA1_BLOCK_LENGTH-8);
}
uint64_pack_msb((context->bytes << 3),
context->buffer + SHA1_BLOCK_LENGTH - 8);
SHA1Transform(context->state, context->buffer);
for (i = 0; i < 5; ++i, digest += 4)
uint32_pack_msb(context->state[i], digest);
/* Wipe variables */
memset(context, 0, sizeof(*context));
}
#ifdef SELFTEST_MAIN
#include "selftest.c"
#include "str/str.h"
static SHA1_CTX ctx;
static void init(void) { SHA1_Init(&ctx); }
static void hash(const char* ptr, long len) {
SHA1_Update(&ctx, (const unsigned char*)ptr, len);
}
static void dump(void)
{
unsigned i;
unsigned char digest[SHA1_DIGEST_LENGTH];
SHA1_Final(&ctx, digest);
for (i = 0; i < sizeof(digest); ++i)
obuf_putXw(&outbuf, digest[i], 2, '0');
NL();
}
static void test(const char* ptr, long len)
{
init();
hash(ptr, len);
dump();
}
MAIN
{
unsigned i;
/* Test Vectors (from FIPS PUB 180-1) */
test("abc", 3);
test("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56);
init();
for (i = 0; i < 1000000/64; ++i)
hash("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
64);
dump();
}
#endif
#ifdef SELFTEST_EXP
A9993E364706816ABA3E25717850C26C9CD0D89D
84983E441C3BD26EBAAE4AA1F95129E5E54670F1
34AA973CD4C4DAA4F61EEB2BDBAD27316534016F
#endif
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