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 6c05d731f4..a193d98d54 100644 --- a/crypto/aes.c +++ b/crypto/aes.c @@ -1323,6 +1323,64 @@ void aesenc_SB_SR_AK_genrev(AESState *r, const AESState *s, const AESState *k) } /* + * Perform SubBytes + ShiftRows + MixColumns + AddRoundKey. + */ +static inline void +aesenc_SB_SR_MC_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_Te0[st->b[swap_b ^ AES_SH(0x0)]] ^ + AES_Te1[st->b[swap_b ^ AES_SH(0x1)]] ^ + AES_Te2[st->b[swap_b ^ AES_SH(0x2)]] ^ + AES_Te3[st->b[swap_b ^ AES_SH(0x3)]]); + + w1 = (AES_Te0[st->b[swap_b ^ AES_SH(0x4)]] ^ + AES_Te1[st->b[swap_b ^ AES_SH(0x5)]] ^ + AES_Te2[st->b[swap_b ^ AES_SH(0x6)]] ^ + AES_Te3[st->b[swap_b ^ AES_SH(0x7)]]); + + w2 = (AES_Te0[st->b[swap_b ^ AES_SH(0x8)]] ^ + AES_Te1[st->b[swap_b ^ AES_SH(0x9)]] ^ + AES_Te2[st->b[swap_b ^ AES_SH(0xA)]] ^ + AES_Te3[st->b[swap_b ^ AES_SH(0xB)]]); + + w3 = (AES_Te0[st->b[swap_b ^ AES_SH(0xC)]] ^ + AES_Te1[st->b[swap_b ^ AES_SH(0xD)]] ^ + AES_Te2[st->b[swap_b ^ AES_SH(0xE)]] ^ + AES_Te3[st->b[swap_b ^ AES_SH(0xF)]]); + + /* Note that AES_TeX 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 aesenc_SB_SR_MC_AK_gen(AESState *r, const AESState *st, + const AESState *rk) +{ + aesenc_SB_SR_MC_AK_swap(r, st, rk, false); +} + +void aesenc_SB_SR_MC_AK_genrev(AESState *r, const AESState *st, + const AESState *rk) +{ + aesenc_SB_SR_MC_AK_swap(r, st, rk, true); +} + +/* * Perform InvMixColumns. */ static inline void |