diff options
Diffstat (limited to 'crypto/aes.c')
| -rw-r--r-- | crypto/aes.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/crypto/aes.c b/crypto/aes.c index a193d98d54..c2546ef12e 100644 --- a/crypto/aes.c +++ b/crypto/aes.c @@ -1484,6 +1484,64 @@ void aesdec_ISB_ISR_AK_genrev(AESState *r, const AESState *s, const AESState *k) aesdec_ISB_ISR_AK_swap(r, s, k, true); } +/* + * Perform InvSubBytes + InvShiftRows + InvMixColumns + AddRoundKey. + */ +static inline void +aesdec_ISB_ISR_IMC_AK_swap(AESState *r, const AESState *st, + const AESState *rk, bool swap) +{ + int swap_b = swap * 0xf; + int swap_w = swap * 0x3; + bool be = HOST_BIG_ENDIAN ^ swap; + uint32_t w0, w1, w2, w3; + + w0 = (AES_Td0[st->b[swap_b ^ AES_ISH(0x0)]] ^ + AES_Td1[st->b[swap_b ^ AES_ISH(0x1)]] ^ + AES_Td2[st->b[swap_b ^ AES_ISH(0x2)]] ^ + AES_Td3[st->b[swap_b ^ AES_ISH(0x3)]]); + + w1 = (AES_Td0[st->b[swap_b ^ AES_ISH(0x4)]] ^ + AES_Td1[st->b[swap_b ^ AES_ISH(0x5)]] ^ + AES_Td2[st->b[swap_b ^ AES_ISH(0x6)]] ^ + AES_Td3[st->b[swap_b ^ AES_ISH(0x7)]]); + + w2 = (AES_Td0[st->b[swap_b ^ AES_ISH(0x8)]] ^ + AES_Td1[st->b[swap_b ^ AES_ISH(0x9)]] ^ + AES_Td2[st->b[swap_b ^ AES_ISH(0xA)]] ^ + AES_Td3[st->b[swap_b ^ AES_ISH(0xB)]]); + + w3 = (AES_Td0[st->b[swap_b ^ AES_ISH(0xC)]] ^ + AES_Td1[st->b[swap_b ^ AES_ISH(0xD)]] ^ + AES_Td2[st->b[swap_b ^ AES_ISH(0xE)]] ^ + AES_Td3[st->b[swap_b ^ AES_ISH(0xF)]]); + + /* Note that AES_TdX is encoded for big-endian. */ + if (!be) { + w0 = bswap32(w0); + w1 = bswap32(w1); + w2 = bswap32(w2); + w3 = bswap32(w3); + } + + r->w[swap_w ^ 0] = rk->w[swap_w ^ 0] ^ w0; + r->w[swap_w ^ 1] = rk->w[swap_w ^ 1] ^ w1; + r->w[swap_w ^ 2] = rk->w[swap_w ^ 2] ^ w2; + r->w[swap_w ^ 3] = rk->w[swap_w ^ 3] ^ w3; +} + +void aesdec_ISB_ISR_IMC_AK_gen(AESState *r, const AESState *st, + const AESState *rk) +{ + aesdec_ISB_ISR_IMC_AK_swap(r, st, rk, false); +} + +void aesdec_ISB_ISR_IMC_AK_genrev(AESState *r, const AESState *st, + const AESState *rk) +{ + aesdec_ISB_ISR_IMC_AK_swap(r, st, rk, true); +} + /** * Expand the cipher key into the encryption key schedule. */ |