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Add support for key inversion using AES-NI

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This commit is contained in:
Manuel Pégourié-Gonnard
2013-12-28 15:58:30 +01:00
parent 80637c7520
commit 01e31bbffb
3 changed files with 42 additions and 0 deletions
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22
library/aesni.c
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@ -215,6 +215,28 @@ int aesni_gcm_mult( unsigned char c[16],
return( 0 );
}
/*
* Compute decryption round keys from encryption round keys
*/
void aesni_inverse_key( unsigned char *invkey,
const unsigned char *fwdkey, int nr )
{
unsigned char *ik = invkey;
const unsigned char *fk = fwdkey + 16 * nr;
memcpy( ik, fk, 16 );
for( fk -= 16, ik += 16; fk > fwdkey; fk -= 16, ik += 16 )
asm( "movdqu (%0), %%xmm0 \n"
"aesimc %%xmm0, %%xmm0 \n"
"movdqu %%xmm0, (%1) \n"
:
: "r" (fk), "r" (ik)
: "memory", "xmm0" );
memcpy( ik, fk, 16 );
}
#endif /* POLARSSL_HAVE_X86_64 */
#endif /* POLARSSL_AESNI_C */