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Add AES-NI key expansion for 128 bits

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Manuel Pégourié-Gonnard 2013-12-28 20:45:04 +01:00
parent 01e31bbffb
commit 47a3536a31
3 changed files with 86 additions and 0 deletions
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13
include/polarssl/aesni.h
View File

@ -91,6 +91,19 @@ int aesni_gcm_mult( unsigned char c[16],
void aesni_inverse_key( unsigned char *invkey,
const unsigned char *fwdkey, int nr );
/**
* \brief Perform key expansion (for encryption)
*
* \param rk Destination buffer where the round keys are written
* \param key Encryption key
* \param bits Key size in bits (must be 128, 192 or 256)
*
* \return 0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH
*/
int aesni_setkey_enc( unsigned char *rk,
const unsigned char *key,
size_t bits );
#endif /* POLARSSL_HAVE_X86_64 */
#endif /* POLARSSL_AESNI_H */

9
library/aes.c
View File

@ -483,6 +483,15 @@ int aes_setkey_enc( aes_context *ctx, const unsigned char *key, unsigned int key
#endif
ctx->rk = RK = ctx->buf;
#if defined(POLARSSL_AESNI_C) && defined(POLARSSL_HAVE_X86_64)
if( aesni_supports( POLARSSL_AESNI_AES ) )
{
int ret = aesni_setkey_enc( (unsigned char *) ctx->rk, key, keysize );
// XXX: temporary while some key size aren't handled
if( ret == 0 ) return( ret );
}
#endif
for( i = 0; i < (keysize >> 5); i++ )
{
GET_UINT32_LE( RK[i], key, i << 2 );

64
library/aesni.c
View File

@ -237,6 +237,70 @@ void aesni_inverse_key( unsigned char *invkey,
memcpy( ik, fk, 16 );
}
/*
* Key expansion, 128-bit case
*/
void aesni_setkey_enc_128( unsigned char *rk,
const unsigned char *key )
{
asm( "movdqu (%1), %%xmm0 \n" // copy the original key
"movdqu %%xmm0, (%0) \n" // as round key 0
"jmp 2f \n" // skip auxiliary routine
/*
* On entry xmm0 is r3:r2:r1:r0 and xmm1 is X:stuff:stuff:stuff
* with X = rot( sub( r3 ) ) ^ RCON.
*
* On exit, xmm0 is r7:r6:r5:r4
* with r4 = X + r0, r5 = r4 + r1, r6 = r5 + r2, r7 = r6 + r3
* and those are written to the round key buffer.
*/
"1: \n"
"pshufd $0xff, %%xmm1, %%xmm1 \n" // X:X:X:X
"pxor %%xmm0, %%xmm1 \n" // X+r3:X+r2:X+r1:r4
"pslldq $4, %%xmm0 \n" // r2:r1:r0:0
"pxor %%xmm0, %%xmm1 \n" // X+r3+r2:X+r2+r1:r5:r4
"pslldq $4, %%xmm0 \n" // etc
"pxor %%xmm0, %%xmm1 \n"
"pslldq $4, %%xmm0 \n"
"pxor %%xmm1, %%xmm0 \n" // update xmm0 for next time!
"add $16, %0 \n" // point to next round key
"movdqu %%xmm0, (%0) \n" // write it
"ret \n"
/* Main "loop" */
"2: \n"
"aeskeygenassist $0x01, %%xmm0, %%xmm1 \ncall 1b \n"
"aeskeygenassist $0x02, %%xmm0, %%xmm1 \ncall 1b \n"
"aeskeygenassist $0x04, %%xmm0, %%xmm1 \ncall 1b \n"
"aeskeygenassist $0x08, %%xmm0, %%xmm1 \ncall 1b \n"
"aeskeygenassist $0x10, %%xmm0, %%xmm1 \ncall 1b \n"
"aeskeygenassist $0x20, %%xmm0, %%xmm1 \ncall 1b \n"
"aeskeygenassist $0x40, %%xmm0, %%xmm1 \ncall 1b \n"
"aeskeygenassist $0x80, %%xmm0, %%xmm1 \ncall 1b \n"
"aeskeygenassist $0x1B, %%xmm0, %%xmm1 \ncall 1b \n"
"aeskeygenassist $0x36, %%xmm0, %%xmm1 \ncall 1b \n"
:
: "r" (rk), "r" (key)
: "memory", "cc", "0" );
}
/*
* Key expansion, wrapper
*/
int aesni_setkey_enc( unsigned char *rk,
const unsigned char *key,
size_t bits )
{
switch( bits )
{
case 128: aesni_setkey_enc_128( rk, key ); break;
default : return( POLARSSL_ERR_AES_INVALID_KEY_LENGTH );
}
return( 0 );
}
#endif /* POLARSSL_HAVE_X86_64 */
#endif /* POLARSSL_AESNI_C */