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crypto: remove unneeded assignments in aes_unwrap

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A is present in the specification but in practice B always contains A so
drop A.
This commit is contained in:
Andrew Zaborowski 2017-08-31 04:04:46 +02:00 committed by Denis Kenzior
parent f659265000
commit f66ae1e481
1 changed files with 3 additions and 5 deletions
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8
src/crypto.c
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@ -125,7 +125,7 @@ bool cmac_aes(const void *key, size_t key_len,
bool aes_unwrap(const uint8_t *kek, const uint8_t *in, size_t len, bool aes_unwrap(const uint8_t *kek, const uint8_t *in, size_t len,
uint8_t *out) uint8_t *out)
{ {
uint8_t a[8], b[16]; uint8_t b[16];
uint8_t *r; uint8_t *r;
size_t n = (len - 8) >> 3; size_t n = (len - 8) >> 3;
int i, j; int i, j;
@ -136,7 +136,7 @@ bool aes_unwrap(const uint8_t *kek, const uint8_t *in, size_t len,
return false; return false;
/* Set up */ /* Set up */
memcpy(a, in, 8); memcpy(b, in, 8);
memmove(out, in + 8, n * 8); memmove(out, in + 8, n * 8);
/* Unwrap */ /* Unwrap */
@ -144,11 +144,9 @@ bool aes_unwrap(const uint8_t *kek, const uint8_t *in, size_t len,
r = out + (n - 1) * 8; r = out + (n - 1) * 8;
for (i = n; i >= 1; i--) { for (i = n; i >= 1; i--) {
memcpy(b, a, 8);
memcpy(b + 8, r, 8); memcpy(b + 8, r, 8);
b[7] ^= n * j + i; b[7] ^= n * j + i;
l_cipher_decrypt(cipher, b, b, 16); l_cipher_decrypt(cipher, b, b, 16);
memcpy(a, b, 8);
memcpy(r, b + 8, 8); memcpy(r, b + 8, 8);
r -= 8; r -= 8;
} }
@ -158,7 +156,7 @@ bool aes_unwrap(const uint8_t *kek, const uint8_t *in, size_t len,
/* Check IV */ /* Check IV */
for (i = 0; i < 8; i++) for (i = 0; i < 8; i++)
if (a[i] != 0xA6) if (b[i] != 0xA6)
return false; return false;
return true; return true;