diff options
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/xts.c | 40 |
1 files changed, 28 insertions, 12 deletions
diff --git a/crypto/xts.c b/crypto/xts.c index 0ad231f3e5..10ec83ff21 100644 --- a/crypto/xts.c +++ b/crypto/xts.c @@ -24,6 +24,7 @@ */ #include "qemu/osdep.h" +#include "qemu/bswap.h" #include "crypto/xts.h" typedef union { @@ -39,19 +40,34 @@ static inline void xts_uint128_xor(xts_uint128 *D, D->u[1] = S1->u[1] ^ S2->u[1]; } -static void xts_mult_x(uint8_t *I) +static inline void xts_uint128_cpu_to_les(xts_uint128 *v) { - int x; - uint8_t t, tt; + cpu_to_le64s(&v->u[0]); + cpu_to_le64s(&v->u[1]); +} - for (x = t = 0; x < 16; x++) { - tt = I[x] >> 7; - I[x] = ((I[x] << 1) | t) & 0xFF; - t = tt; - } - if (tt) { - I[0] ^= 0x87; +static inline void xts_uint128_le_to_cpus(xts_uint128 *v) +{ + le64_to_cpus(&v->u[0]); + le64_to_cpus(&v->u[1]); +} + +static void xts_mult_x(xts_uint128 *I) +{ + uint64_t tt; + + xts_uint128_le_to_cpus(I); + + tt = I->u[0] >> 63; + I->u[0] <<= 1; + + if (I->u[1] >> 63) { + I->u[0] ^= 0x87; } + I->u[1] <<= 1; + I->u[1] |= tt; + + xts_uint128_cpu_to_les(I); } @@ -79,7 +95,7 @@ static void xts_tweak_encdec(const void *ctx, xts_uint128_xor(dst, dst, iv); /* LFSR the tweak */ - xts_mult_x(iv->b); + xts_mult_x(iv); } @@ -134,7 +150,7 @@ void xts_decrypt(const void *datactx, if (mo > 0) { xts_uint128 S, D; memcpy(&CC, &T, XTS_BLOCK_SIZE); - xts_mult_x(CC.b); + xts_mult_x(&CC); /* PP = tweak decrypt block m-1 */ memcpy(&S, src, XTS_BLOCK_SIZE); |