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/* $OpenBSD: md5_amd64_generic.S,v 1.1 2025/01/24 13:35:04 jsing Exp $ */
/*
* Copyright (c) 2025 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef __CET__
#include <cet.h>
#else
#define _CET_ENDBR
#endif
#define ctx %rdi
#define in %rsi
#define num %rdx
#define end %rbp
#define A %eax
#define B %ebx
#define C %ecx
#define D %edx
#define AA %r8d
#define BB %r9d
#define CC %r10d
#define DD %r11d
#define tmp0 %r12d
#define tmp1 %r13d
/*
* Compute MD5 round 1 as:
*
* a = b + rol(a + F(b, c, d) + x + t, s)
* F(x, y, z) = (x & y) | (~x & z)
* = ((y ^ z) & x) ^ z
*/
#define md5_round1(a, b, c, d, x, t, s) \
addl (x*4)(in), a; \
movl c, tmp0; \
xorl d, tmp0; \
andl b, tmp0; \
xorl d, tmp0; \
leal t(tmp0, a), a; \
roll $s, a; \
addl b, a;
/*
* Compute MD5 round 2 as:
*
* a = b + rol(a + G(b, c, d) + x + t, s)
* G(x, y, z) = (x & z) | (y & ~z)
*/
#define md5_round2(a, b, c, d, x, t, s) \
addl (x*4)(in), a; \
movl d, tmp0; \
xorl $-1, tmp0; \
andl c, tmp0; \
addl tmp0, a; \
movl d, tmp1; \
andl b, tmp1; \
leal t(tmp1, a), a; \
roll $s, a; \
addl b, a;
/*
* Compute MD5 round 3 as:
*
* a = b + rol(a + H(b, c, d) + x + t, s)
* H(x, y, z) = x ^ y ^ z;
*/
#define md5_round3(a, b, c, d, x, t, s) \
addl (x*4)(in), a; \
movl d, tmp0; \
xorl c, tmp0; \
xorl b, tmp0; \
leal t(tmp0, a), a; \
roll $s, a; \
addl b, a;
/*
* Compute MD5 round 4 as:
*
* a = b + rol(a + I(b, c, d) + x + t, s)
* I(x, y, z) = y ^ (x | ~z)
*/
#define md5_round4(a, b, c, d, x, t, s) \
addl (x*4)(in), a; \
movl d, tmp0; \
xorl $-1, tmp0; \
orl b, tmp0; \
xorl c, tmp0; \
leal t(tmp0, a), a; \
roll $s, a; \
addl b, a;
.text
/*
* void md5_block_data_order(MD5_CTX *ctx, const void *in, size_t num);
*
* Standard x86-64 ABI: rdi = ctx, rsi = in, rdx = num
*/
.align 16
.globl md5_block_data_order
.type md5_block_data_order,@function
md5_block_data_order:
_CET_ENDBR
/* Save callee save registers. */
pushq %rbx
pushq %rbp
pushq %r12
pushq %r13
/* Compute end of message. */
shlq $6, num
leaq (in, num, 1), end
/* Load current hash state from context. */
movl (0*4)(ctx), AA
movl (1*4)(ctx), BB
movl (2*4)(ctx), CC
movl (3*4)(ctx), DD
jmp .Lblock_loop
.align 16
.Lblock_loop:
movl AA, A
movl BB, B
movl CC, C
movl DD, D
md5_round1(A, B, C, D, 0, 0xd76aa478L, 7);
md5_round1(D, A, B, C, 1, 0xe8c7b756L, 12);
md5_round1(C, D, A, B, 2, 0x242070dbL, 17);
md5_round1(B, C, D, A, 3, 0xc1bdceeeL, 22);
md5_round1(A, B, C, D, 4, 0xf57c0fafL, 7);
md5_round1(D, A, B, C, 5, 0x4787c62aL, 12);
md5_round1(C, D, A, B, 6, 0xa8304613L, 17);
md5_round1(B, C, D, A, 7, 0xfd469501L, 22);
md5_round1(A, B, C, D, 8, 0x698098d8L, 7);
md5_round1(D, A, B, C, 9, 0x8b44f7afL, 12);
md5_round1(C, D, A, B, 10, 0xffff5bb1L, 17);
md5_round1(B, C, D, A, 11, 0x895cd7beL, 22);
md5_round1(A, B, C, D, 12, 0x6b901122L, 7);
md5_round1(D, A, B, C, 13, 0xfd987193L, 12);
md5_round1(C, D, A, B, 14, 0xa679438eL, 17);
md5_round1(B, C, D, A, 15, 0x49b40821L, 22);
md5_round2(A, B, C, D, 1, 0xf61e2562L, 5);
md5_round2(D, A, B, C, 6, 0xc040b340L, 9);
md5_round2(C, D, A, B, 11, 0x265e5a51L, 14);
md5_round2(B, C, D, A, 0, 0xe9b6c7aaL, 20);
md5_round2(A, B, C, D, 5, 0xd62f105dL, 5);
md5_round2(D, A, B, C, 10, 0x02441453L, 9);
md5_round2(C, D, A, B, 15, 0xd8a1e681L, 14);
md5_round2(B, C, D, A, 4, 0xe7d3fbc8L, 20);
md5_round2(A, B, C, D, 9, 0x21e1cde6L, 5);
md5_round2(D, A, B, C, 14, 0xc33707d6L, 9);
md5_round2(C, D, A, B, 3, 0xf4d50d87L, 14);
md5_round2(B, C, D, A, 8, 0x455a14edL, 20);
md5_round2(A, B, C, D, 13, 0xa9e3e905L, 5);
md5_round2(D, A, B, C, 2, 0xfcefa3f8L, 9);
md5_round2(C, D, A, B, 7, 0x676f02d9L, 14);
md5_round2(B, C, D, A, 12, 0x8d2a4c8aL, 20);
md5_round3(A, B, C, D, 5, 0xfffa3942L, 4);
md5_round3(D, A, B, C, 8, 0x8771f681L, 11);
md5_round3(C, D, A, B, 11, 0x6d9d6122L, 16);
md5_round3(B, C, D, A, 14, 0xfde5380cL, 23);
md5_round3(A, B, C, D, 1, 0xa4beea44L, 4);
md5_round3(D, A, B, C, 4, 0x4bdecfa9L, 11);
md5_round3(C, D, A, B, 7, 0xf6bb4b60L, 16);
md5_round3(B, C, D, A, 10, 0xbebfbc70L, 23);
md5_round3(A, B, C, D, 13, 0x289b7ec6L, 4);
md5_round3(D, A, B, C, 0, 0xeaa127faL, 11);
md5_round3(C, D, A, B, 3, 0xd4ef3085L, 16);
md5_round3(B, C, D, A, 6, 0x04881d05L, 23);
md5_round3(A, B, C, D, 9, 0xd9d4d039L, 4);
md5_round3(D, A, B, C, 12, 0xe6db99e5L, 11);
md5_round3(C, D, A, B, 15, 0x1fa27cf8L, 16);
md5_round3(B, C, D, A, 2, 0xc4ac5665L, 23);
md5_round4(A, B, C, D, 0, 0xf4292244L, 6);
md5_round4(D, A, B, C, 7, 0x432aff97L, 10);
md5_round4(C, D, A, B, 14, 0xab9423a7L, 15);
md5_round4(B, C, D, A, 5, 0xfc93a039L, 21);
md5_round4(A, B, C, D, 12, 0x655b59c3L, 6);
md5_round4(D, A, B, C, 3, 0x8f0ccc92L, 10);
md5_round4(C, D, A, B, 10, 0xffeff47dL, 15);
md5_round4(B, C, D, A, 1, 0x85845dd1L, 21);
md5_round4(A, B, C, D, 8, 0x6fa87e4fL, 6);
md5_round4(D, A, B, C, 15, 0xfe2ce6e0L, 10);
md5_round4(C, D, A, B, 6, 0xa3014314L, 15);
md5_round4(B, C, D, A, 13, 0x4e0811a1L, 21);
md5_round4(A, B, C, D, 4, 0xf7537e82L, 6);
md5_round4(D, A, B, C, 11, 0xbd3af235L, 10);
md5_round4(C, D, A, B, 2, 0x2ad7d2bbL, 15);
md5_round4(B, C, D, A, 9, 0xeb86d391L, 21);
/* Add intermediate state to hash state. */
addl A, AA
addl B, BB
addl C, CC
addl D, DD
addq $64, in
cmpq end, in
jb .Lblock_loop
/* Store new hash state to context. */
movl AA, (0*4)(ctx)
movl BB, (1*4)(ctx)
movl CC, (2*4)(ctx)
movl DD, (3*4)(ctx)
/* Restore callee save registers. */
popq %r13
popq %r12
popq %rbp
popq %rbx
ret
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