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Adapt AES-NI code to "old" binutil versions

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Manuel Pégourié-Gonnard 2014-04-26 17:17:31 +02:00
parent c73079a78c
commit b1fd397be6
1 changed files with 64 additions and 38 deletions
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102
library/aesni.c
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@ -58,6 +58,32 @@ int aesni_supports( unsigned int what )
return( ( c & what ) != 0 ); return( ( c & what ) != 0 );
} }
/*
* Binutils needs to be at least 2.19 to support AES-NI instructions.
* Unfortunately, a lot of users have a lower version now (2014-04).
* Emit bytecode directly in order to support "old" version of gas.
*
* Opcodes from the Intel architecture reference manual, vol. 3.
* We always use registers, so we don't need prefixes for memory operands.
* Operand macros are in gas order (src, dst) as opposed to Intel order
* (dst, src) in order to blend better into the surrounding assembly code.
*/
#define AESDEC ".byte 0x66,0x0F,0x38,0xDE,"
#define AESDECLAST ".byte 0x66,0x0F,0x38,0xDF,"
#define AESENC ".byte 0x66,0x0F,0x38,0xDC,"
#define AESENCLAST ".byte 0x66,0x0F,0x38,0xDD,"
#define AESIMC ".byte 0x66,0x0F,0x38,0xDB,"
#define AESKEYGENA ".byte 0x66,0x0F,0x3A,0xDF,"
#define PCLMULQDQ ".byte 0x66,0x0F,0x3A,0x44,"
#define xmm0_xmm0 "0xC0"
#define xmm0_xmm1 "0xC8"
#define xmm0_xmm2 "0xD0"
#define xmm0_xmm3 "0xD8"
#define xmm0_xmm4 "0xE0"
#define xmm1_xmm0 "0xC1"
#define xmm1_xmm2 "0xD1"
/* /*
* AES-NI AES-ECB block en(de)cryption * AES-NI AES-ECB block en(de)cryption
*/ */
@ -76,22 +102,22 @@ int aesni_crypt_ecb( aes_context *ctx,
"1: \n" // encryption loop "1: \n" // encryption loop
"movdqu (%1), %%xmm1 \n" // load round key "movdqu (%1), %%xmm1 \n" // load round key
"aesenc %%xmm1, %%xmm0 \n" // do round AESENC xmm1_xmm0 "\n" // do round
"addq $16, %1 \n" // point to next round key "addq $16, %1 \n" // point to next round key
"subl $1, %0 \n" // loop "subl $1, %0 \n" // loop
"jnz 1b \n" "jnz 1b \n"
"movdqu (%1), %%xmm1 \n" // load round key "movdqu (%1), %%xmm1 \n" // load round key
"aesenclast %%xmm1, %%xmm0 \n" // last round AESENCLAST xmm1_xmm0 "\n" // last round
"jmp 3f \n" "jmp 3f \n"
"2: \n" // decryption loop "2: \n" // decryption loop
"movdqu (%1), %%xmm1 \n" "movdqu (%1), %%xmm1 \n"
"aesdec %%xmm1, %%xmm0 \n" AESDEC xmm1_xmm0 "\n" // do round
"addq $16, %1 \n" "addq $16, %1 \n"
"subl $1, %0 \n" "subl $1, %0 \n"
"jnz 2b \n" "jnz 2b \n"
"movdqu (%1), %%xmm1 \n" // load round key "movdqu (%1), %%xmm1 \n" // load round key
"aesdeclast %%xmm1, %%xmm0 \n" // last round AESDECLAST xmm1_xmm0 "\n" // last round
"3: \n" "3: \n"
"movdqu %%xmm0, (%4) \n" // export output "movdqu %%xmm0, (%4) \n" // export output
@ -131,10 +157,10 @@ void aesni_gcm_mult( unsigned char c[16],
"movdqa %%xmm1, %%xmm2 \n" // copy of b1:b0 "movdqa %%xmm1, %%xmm2 \n" // copy of b1:b0
"movdqa %%xmm1, %%xmm3 \n" // same "movdqa %%xmm1, %%xmm3 \n" // same
"movdqa %%xmm1, %%xmm4 \n" // same "movdqa %%xmm1, %%xmm4 \n" // same
"pclmulqdq $0x00, %%xmm0, %%xmm1 \n" // a0*b0 = c1:c0 PCLMULQDQ xmm0_xmm1 ",0x00 \n" // a0*b0 = c1:c0
"pclmulqdq $0x11, %%xmm0, %%xmm2 \n" // a1*b1 = d1:d0 PCLMULQDQ xmm0_xmm2 ",0x11 \n" // a1*b1 = d1:d0
"pclmulqdq $0x10, %%xmm0, %%xmm3 \n" // a0*b1 = e1:e0 PCLMULQDQ xmm0_xmm3 ",0x10 \n" // a0*b1 = e1:e0
"pclmulqdq $0x01, %%xmm0, %%xmm4 \n" // a1*b0 = f1:f0 PCLMULQDQ xmm0_xmm4 ",0x01 \n" // a1*b0 = f1:f0
"pxor %%xmm3, %%xmm4 \n" // e1+f1:e0+f0 "pxor %%xmm3, %%xmm4 \n" // e1+f1:e0+f0
"movdqa %%xmm4, %%xmm3 \n" // same "movdqa %%xmm4, %%xmm3 \n" // same
"psrldq $8, %%xmm4 \n" // 0:e1+f1 "psrldq $8, %%xmm4 \n" // 0:e1+f1
@ -228,7 +254,7 @@ void aesni_inverse_key( unsigned char *invkey,
for( fk -= 16, ik += 16; fk > fwdkey; fk -= 16, ik += 16 ) for( fk -= 16, ik += 16; fk > fwdkey; fk -= 16, ik += 16 )
asm( "movdqu (%0), %%xmm0 \n" asm( "movdqu (%0), %%xmm0 \n"
"aesimc %%xmm0, %%xmm0 \n" AESIMC xmm0_xmm0 "\n"
"movdqu %%xmm0, (%1) \n" "movdqu %%xmm0, (%1) \n"
: :
: "r" (fk), "r" (ik) : "r" (fk), "r" (ik)
@ -271,17 +297,17 @@ static void aesni_setkey_enc_128( unsigned char *rk,
"ret \n" "ret \n"
/* Main "loop" */ /* Main "loop" */
"2: \n" "2: \n"
"aeskeygenassist $0x01, %%xmm0, %%xmm1 \ncall 1b \n" AESKEYGENA xmm0_xmm1 ",0x01 \ncall 1b \n"
"aeskeygenassist $0x02, %%xmm0, %%xmm1 \ncall 1b \n" AESKEYGENA xmm0_xmm1 ",0x02 \ncall 1b \n"
"aeskeygenassist $0x04, %%xmm0, %%xmm1 \ncall 1b \n" AESKEYGENA xmm0_xmm1 ",0x04 \ncall 1b \n"
"aeskeygenassist $0x08, %%xmm0, %%xmm1 \ncall 1b \n" AESKEYGENA xmm0_xmm1 ",0x08 \ncall 1b \n"
"aeskeygenassist $0x10, %%xmm0, %%xmm1 \ncall 1b \n" AESKEYGENA xmm0_xmm1 ",0x10 \ncall 1b \n"
"aeskeygenassist $0x20, %%xmm0, %%xmm1 \ncall 1b \n" AESKEYGENA xmm0_xmm1 ",0x20 \ncall 1b \n"
"aeskeygenassist $0x40, %%xmm0, %%xmm1 \ncall 1b \n" AESKEYGENA xmm0_xmm1 ",0x40 \ncall 1b \n"
"aeskeygenassist $0x80, %%xmm0, %%xmm1 \ncall 1b \n" AESKEYGENA xmm0_xmm1 ",0x80 \ncall 1b \n"
"aeskeygenassist $0x1B, %%xmm0, %%xmm1 \ncall 1b \n" AESKEYGENA xmm0_xmm1 ",0x1B \ncall 1b \n"
"aeskeygenassist $0x36, %%xmm0, %%xmm1 \ncall 1b \n" AESKEYGENA xmm0_xmm1 ",0x36 \ncall 1b \n"
: :
: "r" (rk), "r" (key) : "r" (rk), "r" (key)
: "memory", "cc", "0" ); : "memory", "cc", "0" );
@ -329,15 +355,15 @@ static void aesni_setkey_enc_192( unsigned char *rk,
"add $8, %0 \n" "add $8, %0 \n"
"ret \n" "ret \n"
"2: \n" "2: \n"
"aeskeygenassist $0x01, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x01 \ncall 1b \n"
"aeskeygenassist $0x02, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x02 \ncall 1b \n"
"aeskeygenassist $0x04, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x04 \ncall 1b \n"
"aeskeygenassist $0x08, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x08 \ncall 1b \n"
"aeskeygenassist $0x10, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x10 \ncall 1b \n"
"aeskeygenassist $0x20, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x20 \ncall 1b \n"
"aeskeygenassist $0x40, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x40 \ncall 1b \n"
"aeskeygenassist $0x80, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x80 \ncall 1b \n"
: :
: "r" (rk), "r" (key) : "r" (rk), "r" (key)
@ -380,7 +406,7 @@ static void aesni_setkey_enc_256( unsigned char *rk,
/* Set xmm2 to stuff:Y:stuff:stuff with Y = subword( r11 ) /* Set xmm2 to stuff:Y:stuff:stuff with Y = subword( r11 )
* and proceed to generate next round key from there */ * and proceed to generate next round key from there */
"aeskeygenassist $0, %%xmm0, %%xmm2\n" AESKEYGENA xmm0_xmm2 ",0x00 \n"
"pshufd $0xaa, %%xmm2, %%xmm2 \n" "pshufd $0xaa, %%xmm2, %%xmm2 \n"
"pxor %%xmm1, %%xmm2 \n" "pxor %%xmm1, %%xmm2 \n"
"pslldq $4, %%xmm1 \n" "pslldq $4, %%xmm1 \n"
@ -397,14 +423,14 @@ static void aesni_setkey_enc_256( unsigned char *rk,
* Main "loop" - Generating one more key than necessary, * Main "loop" - Generating one more key than necessary,
* see definition of aes_context.buf * see definition of aes_context.buf
*/ */
"2: \n" "2: \n"
"aeskeygenassist $0x01, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x01 \ncall 1b \n"
"aeskeygenassist $0x02, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x02 \ncall 1b \n"
"aeskeygenassist $0x04, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x04 \ncall 1b \n"
"aeskeygenassist $0x08, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x08 \ncall 1b \n"
"aeskeygenassist $0x10, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x10 \ncall 1b \n"
"aeskeygenassist $0x20, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x20 \ncall 1b \n"
"aeskeygenassist $0x40, %%xmm1, %%xmm2 \ncall 1b \n" AESKEYGENA xmm1_xmm2 ",0x40 \ncall 1b \n"
: :
: "r" (rk), "r" (key) : "r" (rk), "r" (key)
: "memory", "cc", "0" ); : "memory", "cc", "0" );