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.text
.p2align 2,0x90
.globl _sha1block
.type _sha1block, @function
_sha1block:
/* x = (wp[off-f] ^ wp[off-8] ^ wp[off-14] ^ wp[off-16]) <<< 1;
* wp[off] = x;
* x += A <<< 5;
* E += 0xca62c1d6 + x;
* x = FN(B,C,D);
* E += x;
* B >>> 2
*/
#define BSWAPDI BYTE $0x0f; BYTE $0xcf;
#define BODY(off,FN,V,A,B,C,D,E)\
movl (off-64)(%ebp), %edi;\
xorl (off-56)(%ebp), %edi;\
xorl (off-32)(%ebp), %edi;\
xorl (off-12)(%ebp), %edi;\
roll $1, %edi;\
movl %edi, off(%ebp);\
leal V(%edi, E, 1), E;\
movl A, %edi;\
roll $5, %edi;\
addl %edi, E;\
FN(B,C,D)\
addl %edi, E;\
rorl $2, B;\
#define BODY0(off,FN,V,A,B,C,D,E)\
movl off(%ebx), %edi;\
bswap %edi;\
movl %edi, off(%ebp);\
leal V(%edi,E,1), E;\
movl A, %edi;\
roll $5,%edi;\
addl %edi,E;\
FN(B,C,D)\
addl %edi,E;\
rorl $2,B;\
/*
* fn1 = (((C^D)&B)^D);
*/
#define FN1(B,C,D)\
movl C, %edi;\
xorl D, %edi;\
andl B, %edi;\
xorl D, %edi;\
/*
* fn24 = B ^ C ^ D
*/
#define FN24(B,C,D)\
movl B, %edi;\
xorl C, %edi;\
xorl D, %edi;\
/*
* fn3 = ((B ^ C) & (D ^= B)) ^ B
* D ^= B to restore D
*/
#define FN3(B,C,D)\
movl B, %edi;\
xorl C, %edi;\
xorl B, D;\
andl D, %edi;\
xorl B, %edi;\
xorl B, D;\
/*
* stack offsets
* void sha1block(uchar *DATA, int LEN, ulong *STATE)
*/
#define STACKSIZE (48+80*4)
#define DATA (STACKSIZE+8)
#define LEN (STACKSIZE+12)
#define STATE (STACKSIZE+16)
/*
* stack offsets for locals
* ulong w[80];
* uchar *edata;
* ulong *w15, *w40, *w60, *w80;
* register local
* ulong *wp = %ebp
* ulong a = eax, b = ebx, c = ecx, d = edx, e = esi
* ulong tmp = edi
*/
#define WARRAY (STACKSIZE-4-(80*4))
#define TMP1 (STACKSIZE-8-(80*4))
#define TMP2 (STACKSIZE-12-(80*4))
#define W15 (STACKSIZE-16-(80*4))
#define W40 (STACKSIZE-20-(80*4))
#define W60 (STACKSIZE-24-(80*4))
#define W80 (STACKSIZE-28-(80*4))
#define EDATA (STACKSIZE-32-(80*4))
#define OLDEBX (STACKSIZE-36-(80*4))
#define OLDESI (STACKSIZE-40-(80*4))
#define OLDEDI (STACKSIZE-44-(80*4))
/* Prelude */
pushl %ebp
subl $(STACKSIZE), %esp
mov %ebx, OLDEBX(%esp)
mov %esi, OLDESI(%esp)
mov %edi, OLDEDI(%esp)
movl DATA(%esp), %eax
addl LEN(%esp), %eax
movl %eax, EDATA(%esp)
leal (WARRAY+15*4)(%esp), %edi /* aw15 */
movl %edi, W15(%esp)
leal (WARRAY+40*4)(%esp), %edx /* aw40 */
movl %edx, W40(%esp)
leal (WARRAY+60*4)(%esp), %ecx /* aw60 */
movl %ecx, W60(%esp)
leal (WARRAY+80*4)(%esp), %edi /* aw80 */
movl %edi, W80(%esp)
mainloop:
leal WARRAY(%esp), %ebp /* warray */
movl STATE(%esp), %edi /* state */
movl (%edi),%eax
movl 4(%edi),%ebx
movl %ebx, TMP1(%esp) /* tmp1 */
movl 8(%edi), %ecx
movl 12(%edi), %edx
movl 16(%edi), %esi
movl DATA(%esp), %ebx /* data */
loop1:
BODY0(0,FN1,0x5a827999,%eax,TMP1(%esp),%ecx,%edx,%esi)
movl %esi,TMP2(%esp)
BODY0(4,FN1,0x5a827999,%esi,%eax,TMP1(%esp),%ecx,%edx)
movl TMP1(%esp),%esi
BODY0(8,FN1,0x5a827999,%edx,TMP2(%esp),%eax,%esi,%ecx)
BODY0(12,FN1,0x5a827999,%ecx,%edx,TMP2(%esp),%eax,%esi)
movl %esi,TMP1(%esp)
BODY0(16,FN1,0x5a827999,%esi,%ecx,%edx,TMP2(%esp),%eax)
movl TMP2(%esp),%esi
addl $20, %ebx
addl $20, %ebp
cmpl W15(%esp), %ebp /* w15 */
jb loop1
BODY0(0,FN1,0x5a827999,%eax,TMP1(%esp),%ecx,%edx,%esi)
addl $4, %ebx
MOVL %ebx, DATA(%esp) /* data */
MOVL TMP1(%esp),%ebx
BODY(4,FN1,0x5a827999,%esi,%eax,%ebx,%ecx,%edx)
BODY(8,FN1,0x5a827999,%edx,%esi,%eax,%ebx,%ecx)
BODY(12,FN1,0x5a827999,%ecx,%edx,%esi,%eax,%ebx)
BODY(16,FN1,0x5a827999,%ebx,%ecx,%edx,%esi,%eax)
addl $20, %ebp
loop2:
BODY(0,FN24,0x6ed9eba1,%eax,%ebx,%ecx,%edx,%esi)
BODY(4,FN24,0x6ed9eba1,%esi,%eax,%ebx,%ecx,%edx)
BODY(8,FN24,0x6ed9eba1,%edx,%esi,%eax,%ebx,%ecx)
BODY(12,FN24,0x6ed9eba1,%ecx,%edx,%esi,%eax,%ebx)
BODY(16,FN24,0x6ed9eba1,%ebx,%ecx,%edx,%esi,%eax)
addl $20,%ebp
cmpl W40(%esp), %ebp
jb loop2
loop3:
BODY(0,FN3,0x8f1bbcdc,%eax,%ebx,%ecx,%edx,%esi)
BODY(4,FN3,0x8f1bbcdc,%esi,%eax,%ebx,%ecx,%edx)
BODY(8,FN3,0x8f1bbcdc,%edx,%esi,%eax,%ebx,%ecx)
BODY(12,FN3,0x8f1bbcdc,%ecx,%edx,%esi,%eax,%ebx)
BODY(16,FN3,0x8f1bbcdc,%ebx,%ecx,%edx,%esi,%eax)
addl $20, %ebp
cmpl W60(%esp), %ebp /* w60 */
jb loop3
loop4:
BODY(0,FN24,0xca62c1d6,%eax,%ebx,%ecx,%edx,%esi)
BODY(4,FN24,0xca62c1d6,%esi,%eax,%ebx,%ecx,%edx)
BODY(8,FN24,0xca62c1d6,%edx,%esi,%eax,%ebx,%ecx)
BODY(12,FN24,0xca62c1d6,%ecx,%edx,%esi,%eax,%ebx)
BODY(16,FN24,0xca62c1d6,%ebx,%ecx,%edx,%esi,%eax)
addl $20, %ebp
cmpl W80(%esp), %ebp /* w80 */
jb loop4
movl STATE(%esp), %edi /* state */
addl %eax, 0(%edi)
addl %ebx, 4(%edi)
addl %ecx, 8(%edi)
addl %edx, 12(%edi)
addl %esi, 16(%edi)
movl EDATA(%esp), %edi /* edata */
cmpl %edi, DATA(%esp) /* data */
jb mainloop
/* Postlude */
mov OLDEBX(%esp), %ebx
mov OLDESI(%esp), %esi
mov OLDEDI(%esp), %edi
addl $(STACKSIZE), %esp
popl %ebp
ret
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