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Add AES-NI key expansion for 192 bits

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Manuel Pégourié-Gonnard 2013-12-29 16:05:22 +01:00
parent 4a5b995c26
commit 23c2f6fee5
1 changed files with 58 additions and 0 deletions
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58
library/aesni.c
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@ -287,6 +287,63 @@ void aesni_setkey_enc_128( unsigned char *rk,
: "memory", "cc", "0" );
}
/*
* Key expansion, 192-bit case
*/
void aesni_setkey_enc_192( unsigned char *rk,
const unsigned char *key )
{
asm( "movdqu (%1), %%xmm0 \n" // copy original round key
"movdqu %%xmm0, (%0) \n"
"add $16, %0 \n"
"movq 16(%1), %%xmm1 \n"
"movq %%xmm1, (%0) \n"
"add $8, %0 \n"
"jmp 2f \n" // skip auxiliary routine
/*
* Finish generating the next 6 quarter-keys.
*
* On entry xmm0 is r3:r2:r1:r0, xmm1 is stuff:stuff:r5:r4
* and xmm2 is stuff:stuff:X:stuff with X = rot( sub( r3 ) ) ^ RCON.
*
* On exit, xmm0 is r9:r8:r7:r6 and xmm1 is stuff:stuff:r11:r10
* and those are written to the round key buffer.
*/
"1: \n"
"pshufd $0x55, %%xmm2, %%xmm2 \n" // X:X:X:X
"pxor %%xmm0, %%xmm2 \n" // X+r3:X+r2:X+r1:r4
"pslldq $4, %%xmm0 \n" // etc
"pxor %%xmm0, %%xmm2 \n"
"pslldq $4, %%xmm0 \n"
"pxor %%xmm0, %%xmm2 \n"
"pslldq $4, %%xmm0 \n"
"pxor %%xmm2, %%xmm0 \n" // update xmm0 = r9:r8:r7:r6
"movdqu %%xmm0, (%0) \n"
"add $16, %0 \n"
"pshufd $0xff, %%xmm0, %%xmm2 \n" // r9:r9:r9:r9
"pxor %%xmm1, %%xmm2 \n" // stuff:stuff:r9+r5:r10
"pslldq $4, %%xmm1 \n" // r2:r1:r0:0
"pxor %%xmm2, %%xmm1 \n" // update xmm1 = stuff:stuff:r11:r10
"movq %%xmm1, (%0) \n"
"add $8, %0 \n"
"ret \n"
"2: \n"
"aeskeygenassist $0x01, %%xmm1, %%xmm2 \ncall 1b \n"
"aeskeygenassist $0x02, %%xmm1, %%xmm2 \ncall 1b \n"
"aeskeygenassist $0x04, %%xmm1, %%xmm2 \ncall 1b \n"
"aeskeygenassist $0x08, %%xmm1, %%xmm2 \ncall 1b \n"
"aeskeygenassist $0x10, %%xmm1, %%xmm2 \ncall 1b \n"
"aeskeygenassist $0x20, %%xmm1, %%xmm2 \ncall 1b \n"
"aeskeygenassist $0x40, %%xmm1, %%xmm2 \ncall 1b \n"
"aeskeygenassist $0x80, %%xmm1, %%xmm2 \ncall 1b \n"
:
: "r" (rk), "r" (key)
: "memory", "cc", "0" );
}
/*
* Key expansion, 256-bit case
*/
@ -363,6 +420,7 @@ int aesni_setkey_enc( unsigned char *rk,
switch( bits )
{
case 128: aesni_setkey_enc_128( rk, key ); break;
case 192: aesni_setkey_enc_192( rk, key ); break;
case 256: aesni_setkey_enc_256( rk, key ); break;
default : return( POLARSSL_ERR_AES_INVALID_KEY_LENGTH );
}