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-rw-r--r--crypto/modes/cbc128.c25
1 files changed, 14 insertions, 11 deletions
diff --git a/crypto/modes/cbc128.c b/crypto/modes/cbc128.c
index 3d3782cbe118..0e54f75470b2 100644
--- a/crypto/modes/cbc128.c
+++ b/crypto/modes/cbc128.c
@@ -117,7 +117,7 @@ void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
unsigned char ivec[16], block128_f block)
{
size_t n;
- union { size_t align; unsigned char c[16]; } tmp;
+ union { size_t t[16/sizeof(size_t)]; unsigned char c[16]; } tmp;
assert(in && out && key && ivec);
@@ -137,11 +137,13 @@ void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
out += 16;
}
}
- else {
+ else if (16%sizeof(size_t) == 0) { /* always true */
while (len>=16) {
+ size_t *out_t=(size_t *)out, *iv_t=(size_t *)iv;
+
(*block)(in, out, key);
- for(n=0; n<16; n+=sizeof(size_t))
- *(size_t *)(out+n) ^= *(size_t *)(iv+n);
+ for(n=0; n<16/sizeof(size_t); n++)
+ out_t[n] ^= iv_t[n];
iv = in;
len -= 16;
in += 16;
@@ -165,15 +167,16 @@ void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
out += 16;
}
}
- else {
- size_t c;
+ else if (16%sizeof(size_t) == 0) { /* always true */
while (len>=16) {
+ size_t c, *out_t=(size_t *)out, *ivec_t=(size_t *)ivec;
+ const size_t *in_t=(const size_t *)in;
+
(*block)(in, tmp.c, key);
- for(n=0; n<16; n+=sizeof(size_t)) {
- c = *(size_t *)(in+n);
- *(size_t *)(out+n) =
- *(size_t *)(tmp.c+n) ^ *(size_t *)(ivec+n);
- *(size_t *)(ivec+n) = c;
+ for(n=0; n<16/sizeof(size_t); n++) {
+ c = in_t[n];
+ out_t[n] = tmp.t[n] ^ ivec_t[n];
+ ivec_t[n] = c;
}
len -= 16;
in += 16;