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Reduced size from 2087 bytes to 1056 bytes

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This commit is contained in:
Michael Brown 2006-09-11 17:18:06 +00:00
parent 48bdde5d7b
commit 2eed0bb8e5
1 changed files with 100 additions and 4 deletions
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104
src/crypto/md5.c
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@ -26,13 +26,90 @@
#define MD5_BLOCK_WORDS 16
#define MD5_HASH_WORDS 4
#define __md5step __attribute__ (( regparm ( 3 ) ))
struct md5_step {
uint32_t __md5step ( * f ) ( uint32_t b, uint32_t c, uint32_t d );
uint8_t coefficient;
uint8_t constant;
};
static uint32_t __md5step f1 ( uint32_t b, uint32_t c, uint32_t d ) {
return ( d ^ ( b & ( c ^ d ) ) );
}
static uint32_t __md5step f2 ( uint32_t b, uint32_t c, uint32_t d ) {
return ( c ^ ( d & ( b ^ c ) ) );
}
static uint32_t __md5step f3 ( uint32_t b, uint32_t c, uint32_t d ) {
return ( b ^ c ^ d );
}
static uint32_t __md5step f4 ( uint32_t b, uint32_t c, uint32_t d ) {
return ( c ^ ( b | ~d ) );
}
struct md5_step md5_steps[4] = {
{
.f = f1,
.coefficient = 1,
.constant = 0,
},
{
.f = f2,
.coefficient = 5,
.constant = 1,
},
{
.f = f3,
.coefficient = 3,
.constant = 5,
},
{
.f = f4,
.coefficient = 7,
.constant = 0,
}
};
static const uint8_t r[64] = {
7,12,17,22,7,12,17,22,7,12,17,22,7,12,17,22,
5,9,14,20,5,9,14,20,5,9,14,20,5,9,14,20,
4,11,16,23,4,11,16,23,4,11,16,23,4,11,16,23,
6,10,15,21,6,10,15,21,6,10,15,21,6,10,15,21
};
static const uint32_t k[] = {
0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL,
0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,
0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL,
0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,
0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL,
0xd62f105dUL, 0x02441453UL, 0xd8a1e681UL, 0xe7d3fbc8UL,
0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL,
0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,
0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL,
0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,
0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x04881d05UL,
0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,
0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL,
0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,
0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL,
0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL,
0xe1f27f3aUL, 0xf5710fb0UL, 0xada0e5c4UL, 0x98e4c919UL
};
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))
#define MD5STEP(f, w, x, y, z, in, s) \
(w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)
#define MD5STEP(f, w, x, y, z, in, s) do { \
(w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x) ; \
printf ( "a=%#08x, b=%#08x, c=%#08x, d=%#08x\n", a, b, c, d );\
} while ( 0 )
struct md5_ctx {
u32 hash[MD5_HASH_WORDS];
@ -40,15 +117,33 @@ struct md5_ctx {
u64 byte_count;
};
static void md5_transform(u32 *hash, u32 const *in)
static void md5_transform(u32 *hash, const u32 *in)
{
u32 a, b, c, d;
u32 a, b, c, d, f, g, t, q;
int i;
struct md5_step *step;
a = hash[0];
b = hash[1];
c = hash[2];
d = hash[3];
#if 1
for ( i = 0 ; i < 64 ; i++ ) {
step = &md5_steps[i >> 4];
f = step->f ( b, c, d );
g = ( ( i * step->coefficient + step->constant ) & 0xf );
t = d;
d = c;
c = b;
q = ( a + f + k[i] + in[g] );
b += ( ( q << r[i] ) | ( q >> ( 32-r[i] ) ) );
a = t;
printf ( "a=%#08x, b=%#08x, c=%#08x, d=%#08x\n", a, b, c, d );
}
#else
MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
@ -116,6 +211,7 @@ static void md5_transform(u32 *hash, u32 const *in)
MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
#endif
hash[0] += a;
hash[1] += b;