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#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21
// #define F(x, y, z) (x & y) + (~x & z) = x&y + (z - z&x) = z + y&x - z&x
//#define F(x, y, z) movl x,%ebx; movl x,%eax; notl %ebx; andl y,%eax; andl z,%ebx; addl %ebx,%eax
#define F(x, y, z) movl y,%eax; movl z,%ebx; andl x,%eax; andl x,%ebx; addl z,%eax; subl %ebx,%eax
// #define G(x, y, z) (x & z) + (y & ~z) = x&z + (y - y&z) = y + x&z - y&z
#define G(x, y, z) movl z,%ebx; movl z,%eax; notl %ebx; andl x,%eax; andl y,%ebx; addl %ebx,%eax
//#define G(x, y, z) movl x,%eax; movl y,%ebx; andl z,%eax; andl z,%ebx; addl y,%eax; subl %ebx,%eax
//#define G(x, y, z) movl z,%eax; movl z,%ebx; andl x,%eax; andl y,%ebx; addl y,%eax; subl %ebx,%eax
// #define H(x, y, z) x ^ y ^ z
#define H(x, y, z) movl z,%eax; xorl y,%eax; xorl x,%eax
// #define I(x, y, z) y ^ (x | ~z)
#define I(x, y, z) movl z,%eax; notl %eax; orl x,%eax; xorl y,%eax
// #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
#define ROTATE_LEFT(x, n) roll $n,x
// #define FF(a, b, c, d, x, s, ac) { (a) += F (b, c, d) + (x) + (word)(ac); (a) = ROTATE_LEFT (a, s); (a) += (b); }
// #define GG(a, b, c, d, x, s, ac) { (a) += G (b, c, d) + (x) + (word)(ac); (a) = ROTATE_LEFT (a, s); (a) += (b); }
// #define HH(a, b, c, d, x, s, ac) { (a) += H (b, c, d) + (x) + (word)(ac); (a) = ROTATE_LEFT (a, s); (a) += (b); }
// #define II(a, b, c, d, x, s, ac) { (a) += I (b, c, d) + (x) + (word)(ac); (a) = ROTATE_LEFT (a, s); (a) += (b); }
#define FF(a, b, c, d, x, s, ac) addl x, a; addl $ac,a; F (b, c, d); addl %eax,a; roll $s,a; addl b,a
#define GG(a, b, c, d, x, s, ac) addl x, a; addl $ac,a; G (b, c, d); addl %eax,a; roll $s,a; addl b,a
#define HH(a, b, c, d, x, s, ac) addl x, a; addl $ac,a; H (b, c, d); addl %eax,a; roll $s,a; addl b,a
#define II(a, b, c, d, x, s, ac) addl x, a; addl $ac,a; I (b, c, d); addl %eax,a; roll $s,a; addl b,a
// // x is ecx
// word a = state [0]; // a is edx
// word b = state [1]; // b is esi
// word c = state [2]; // c is edi
// word d = state [3]; // d is ebp
#define X(n) 4*(n)(%ecx)
#define X0 (%ecx)
#define a %edx
#define b %esi
#define c %edi
#define d %ebp
/* MD5 basic transformation: Transforms state based on data block */
// void __MD5Transform ( word state[4], const word* x, size_t repeat )
.text
.type __MD5Transform, @function
.align 32
.global __MD5Transform
.align 32
.Lrepeat:
/* Round 1 */
FF (a, b, c, d, X0 , S11, 0xd76aa478); /* 1 */
FF (d, a, b, c, X( 1), S12, 0xe8c7b756); /* 2 */
FF (c, d, a, b, X( 2), S13, 0x242070db); /* 3 */
FF (b, c, d, a, X( 3), S14, 0xc1bdceee); /* 4 */
FF (a, b, c, d, X( 4), S11, 0xf57c0faf); /* 5 */
FF (d, a, b, c, X( 5), S12, 0x4787c62a); /* 6 */
FF (c, d, a, b, X( 6), S13, 0xa8304613); /* 7 */
FF (b, c, d, a, X( 7), S14, 0xfd469501); /* 8 */
FF (a, b, c, d, X( 8), S11, 0x698098d8); /* 9 */
FF (d, a, b, c, X( 9), S12, 0x8b44f7af); /* 10 */
FF (c, d, a, b, X(10), S13, 0xffff5bb1); /* 11 */
FF (b, c, d, a, X(11), S14, 0x895cd7be); /* 12 */
FF (a, b, c, d, X(12), S11, 0x6b901122); /* 13 */
FF (d, a, b, c, X(13), S12, 0xfd987193); /* 14 */
FF (c, d, a, b, X(14), S13, 0xa679438e); /* 15 */
FF (b, c, d, a, X(15), S14, 0x49b40821); /* 16 */
/* Round 2 */
GG (a, b, c, d, X( 1), S21, 0xf61e2562); /* 17 */
GG (d, a, b, c, X( 6), S22, 0xc040b340); /* 18 */
GG (c, d, a, b, X(11), S23, 0x265e5a51); /* 19 */
GG (b, c, d, a, X0 , S24, 0xe9b6c7aa); /* 20 */
GG (a, b, c, d, X( 5), S21, 0xd62f105d); /* 21 */
GG (d, a, b, c, X(10), S22, 0x02441453); /* 22 */
GG (c, d, a, b, X(15), S23, 0xd8a1e681); /* 23 */
GG (b, c, d, a, X( 4), S24, 0xe7d3fbc8); /* 24 */
GG (a, b, c, d, X( 9), S21, 0x21e1cde6); /* 25 */
GG (d, a, b, c, X(14), S22, 0xc33707d6); /* 26 */
GG (c, d, a, b, X( 3), S23, 0xf4d50d87); /* 27 */
GG (b, c, d, a, X( 8), S24, 0x455a14ed); /* 28 */
GG (a, b, c, d, X(13), S21, 0xa9e3e905); /* 29 */
GG (d, a, b, c, X( 2), S22, 0xfcefa3f8); /* 30 */
GG (c, d, a, b, X( 7), S23, 0x676f02d9); /* 31 */
GG (b, c, d, a, X(12), S24, 0x8d2a4c8a); /* 32 */
/* Round 3 */
HH (a, b, c, d, X( 5), S31, 0xfffa3942); /* 33 */
HH (d, a, b, c, X( 8), S32, 0x8771f681); /* 34 */
HH (c, d, a, b, X(11), S33, 0x6d9d6122); /* 35 */
HH (b, c, d, a, X(14), S34, 0xfde5380c); /* 36 */
HH (a, b, c, d, X( 1), S31, 0xa4beea44); /* 37 */
HH (d, a, b, c, X( 4), S32, 0x4bdecfa9); /* 38 */
HH (c, d, a, b, X( 7), S33, 0xf6bb4b60); /* 39 */
HH (b, c, d, a, X(10), S34, 0xbebfbc70); /* 40 */
HH (a, b, c, d, X(13), S31, 0x289b7ec6); /* 41 */
HH (d, a, b, c, X0 , S32, 0xeaa127fa); /* 42 */
HH (c, d, a, b, X( 3), S33, 0xd4ef3085); /* 43 */
HH (b, c, d, a, X( 6), S34, 0x04881d05); /* 44 */
HH (a, b, c, d, X( 9), S31, 0xd9d4d039); /* 45 */
HH (d, a, b, c, X(12), S32, 0xe6db99e5); /* 46 */
HH (c, d, a, b, X(15), S33, 0x1fa27cf8); /* 47 */
HH (b, c, d, a, X( 2), S34, 0xc4ac5665); /* 48 */
/* Round 4 */
II (a, b, c, d, X0 , S41, 0xf4292244); /* 49 */
II (d, a, b, c, X( 7), S42, 0x432aff97); /* 50 */
II (c, d, a, b, X(14), S43, 0xab9423a7); /* 51 */
II (b, c, d, a, X( 5), S44, 0xfc93a039); /* 52 */
II (a, b, c, d, X(12), S41, 0x655b59c3); /* 53 */
II (d, a, b, c, X( 3), S42, 0x8f0ccc92); /* 54 */
II (c, d, a, b, X(10), S43, 0xffeff47d); /* 55 */
II (b, c, d, a, X( 1), S44, 0x85845dd1); /* 56 */
II (a, b, c, d, X( 8), S41, 0x6fa87e4f); /* 57 */
II (d, a, b, c, X(15), S42, 0xfe2ce6e0); /* 58 */
II (c, d, a, b, X( 6), S43, 0xa3014314); /* 59 */
II (b, c, d, a, X(13), S44, 0x4e0811a1); /* 60 */
II (a, b, c, d, X( 4), S41, 0xf7537e82); /* 61 */
II (d, a, b, c, X(11), S42, 0xbd3af235); /* 62 */
II (c, d, a, b, X( 2), S43, 0x2ad7d2bb); /* 63 */
II (b, c, d, a, X( 9), S44, 0xeb86d391); /* 64 */
// state [0] += a;
// state [1] += b;
// state [2] += c;
// state [3] += d;
addl $64,%ecx
movl 4+32(%esp),%eax // state
addl (%eax),a
addl 4(%eax),b
addl 8(%eax),c
addl 12(%eax),d
movl a, (%eax)
movl b, 4(%eax)
movl c, 8(%eax)
movl d,12(%eax)
.Lstart:
decl 12+32(%esp)
jns .Lrepeat
popal
ret
__MD5Transform:
__MD5TransformLocal:
pushal
movl 8+32(%esp),%ecx // x
movl 4+32(%esp),%eax // state
movl (%eax),a
movl 4(%eax),b
movl 8(%eax),c
movl 12(%eax),d
jmp .Lstart
.Lende:
.size __MD5Transform, .Lende-__MD5Transform
.type MD5Init,@function
.global MD5Init
MD5Init:
movl 4(%esp), %ecx
xorl %eax,%eax
movl $0x67452301, (%ecx)
movl $0xefcdab89, 4(%ecx)
movl $0x98badcfe, 8(%ecx)
movl $0x10325476, 12(%ecx)
movl %eax, 16(%ecx)
movl %eax, 20(%ecx)
ret
.global MD5Update
.type MD5Update,@function
// void MD5Update ( MD5_CTX* context, const byte* input, size_t inputBytes )
#define CONTEXT 4+32(%esp)
#define INPUT 8+32(%esp)
#define INPUTBYTES 12+32(%esp)
#define COUNT 16(%ebx)
#define BUFFER 24(%ebx)
MD5Update:
pushal
cld
movl CONTEXT, %ebx
// ByteIndex = (context->count[0] >> 3) & 0x3F;
movl COUNT, %ebp
shrl $3, %ebp
andl $63,%ebp // ebp = ByteIndex
// if ( (context->count[0] += inputBytes << 3 ) < (inputBytes << 3) )
// context->count[1]++;
// context->count[1] += inputBytes >> (32-3);
movl $8, %eax
mull INPUTBYTES
addl %eax, 0+COUNT
adcl %edx, 4+COUNT
// partLen = 64 - ByteIndex;
movl $64, %eax
subl %ebp, %eax // eax = partLen
// i = 0;
// if ( partLen <= inputBytes ) {
xorl %ecx,%ecx // ecx = i
cmpl INPUTBYTES, %eax
ja .Lende2
// memcpy ( context->buffer + ByteIndex, input, partLen );
leal 24(%ebx,%ebp,1), %edi
movl INPUT, %esi
movl %eax, %ecx
rep movsb
// MD5Transform ( context->state, context->buffer, 1 );
pushl $1
leal BUFFER, %ecx
pushl %ecx
push %ebx
call __MD5TransformLocal
// len = (inputBytes - partLen) / 64;
movl 12+INPUTBYTES, %ecx
subl %eax, %ecx
shrl $6, %ecx
// MD5Transform ( context->state, input+partLen, len );
pushl %ecx
pushl %esi
pushl %ebx
call __MD5TransformLocal
addl $24,%esp
// i = partLen + 64 * len;
// ByteIndex = 0;
shll $6, %ecx
addl %eax, %ecx
xorl %ebp, %ebp
.Lende2:
// }
// memcpy ( context->buffer + ByteIndex, input + i, inputBytes - i );
movl INPUT, %esi
addl %ecx, %esi
negl %ecx
addl INPUTBYTES, %ecx
leal 24(%ebx,%ebp,1), %edi
rep movsb
popal
ret
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