1 C nettle, low-level cryptographics library
3 C Copyright (C) 2001, 2002, 2005, 2008 Rafael R. Sevilla, Niels Möller
5 C The nettle library is free software; you can redistribute it and/or modify
6 C it under the terms of the GNU Lesser General Public License as published by
7 C the Free Software Foundation; either version 2.1 of the License, or (at your
8 C option) any later version.
10 C The nettle library is distributed in the hope that it will be useful, but
11 C WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 C or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
13 C License for more details.
15 C You should have received a copy of the GNU Lesser General Public License
16 C along with the nettle library; see the file COPYING.LIB. If not, write to
17 C the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
20 include_src(<x86_64/aes.m4>)
24 C AES state, use two of them
35 define(<TABLE>, <%rsi>)
36 define(<PARAM_LENGTH>,<%edx>) C Length is only 32 bits
37 define(<PARAM_DST>, <%rcx>)
42 define(<COUNT>, <%r15d>)
43 define(<BLOCK_COUNT>, <%r13d>)
45 C Must correspond to an old-style register, for movzb from %ah--%dh to
49 .file "aes-encrypt-internal.asm"
51 C _aes_encrypt(struct aes_context *ctx,
52 C const struct aes_table *T,
53 C unsigned length, uint8_t *dst,
57 PROLOGUE(_nettle_aes_encrypt)
59 test PARAM_LENGTH, PARAM_LENGTH
62 C save all registers that need to be saved
71 movl PARAM_LENGTH, BLOCK_COUNT
76 AES_LOAD(SA, SB, SC, SD, SRC, KEY)
77 add $16, SRC C Increment src pointer
79 C get number of rounds to do from ctx struct
80 movl AES_NROUNDS (CTX), COUNT
83 add $16,KEY C point to next key
86 AES_ROUND(TABLE, SA,SB,SC,SD, TA, TMP)
87 AES_ROUND(TABLE, SB,SC,SD,SA, TB, TMP)
88 AES_ROUND(TABLE, SC,SD,SA,SB, TC, TMP)
89 AES_ROUND(TABLE, SD,SA,SB,SC, SD, TMP)
95 xorl (KEY),SA C add current session key to plaintext
100 add $16,KEY C point to next key
105 AES_FINAL_ROUND(SA,SB,SC,SD, TABLE, TA, TMP)
106 AES_FINAL_ROUND(SB,SC,SD,SA, TABLE, TB, TMP)
107 AES_FINAL_ROUND(SC,SD,SA,SB, TABLE, TC, TMP)
108 AES_FINAL_ROUND(SD,SA,SB,SC, TABLE, SD, TMP)
113 AES_SUBST_BYTE(TA,TB,TC,SD, TABLE, TMP)
118 C Add last subkey, and store encrypted data
119 AES_STORE(TA,TB,TC,SD, KEY, DST)
135 EPILOGUE(_nettle_aes_encrypt)