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Diffstat (limited to 'libavutil/aes.c')
-rw-r--r--libavutil/aes.c22
1 files changed, 12 insertions, 10 deletions
diff --git a/libavutil/aes.c b/libavutil/aes.c
index 029d738f87..8b78daa782 100644
--- a/libavutil/aes.c
+++ b/libavutil/aes.c
@@ -80,25 +80,27 @@ static inline void addkey_d(uint8_t *dst, const av_aes_block *src,
static void subshift(av_aes_block s0[2], int s, const uint8_t *box)
{
- av_aes_block *s1 = (av_aes_block *) (s0[0].u8 - s);
- av_aes_block *s3 = (av_aes_block *) (s0[0].u8 + s);
+ unsigned char *s1_dst = (unsigned char*)s0[0].u8 + 3 - s;
+ const unsigned char *s1_src = s1_dst + sizeof(*s0);
+ unsigned char *s3_dst = (unsigned char*)s0[0].u8 + s + 1;
+ const unsigned char *s3_src = s3_dst + sizeof(*s0);
s0[0].u8[ 0] = box[s0[1].u8[ 0]];
s0[0].u8[ 4] = box[s0[1].u8[ 4]];
s0[0].u8[ 8] = box[s0[1].u8[ 8]];
s0[0].u8[12] = box[s0[1].u8[12]];
- s1[0].u8[ 3] = box[s1[1].u8[ 7]];
- s1[0].u8[ 7] = box[s1[1].u8[11]];
- s1[0].u8[11] = box[s1[1].u8[15]];
- s1[0].u8[15] = box[s1[1].u8[ 3]];
+ s1_dst[ 0] = box[s1_src[ 4]];
+ s1_dst[ 4] = box[s1_src[ 8]];
+ s1_dst[ 8] = box[s1_src[12]];
+ s1_dst[12] = box[s1_src[ 0]];
s0[0].u8[ 2] = box[s0[1].u8[10]];
s0[0].u8[10] = box[s0[1].u8[ 2]];
s0[0].u8[ 6] = box[s0[1].u8[14]];
s0[0].u8[14] = box[s0[1].u8[ 6]];
- s3[0].u8[ 1] = box[s3[1].u8[13]];
- s3[0].u8[13] = box[s3[1].u8[ 9]];
- s3[0].u8[ 9] = box[s3[1].u8[ 5]];
- s3[0].u8[ 5] = box[s3[1].u8[ 1]];
+ s3_dst[ 0] = box[s3_src[12]];
+ s3_dst[12] = box[s3_src[ 8]];
+ s3_dst[ 8] = box[s3_src[ 4]];
+ s3_dst[ 4] = box[s3_src[ 0]];
}
static inline int mix_core(uint32_t multbl[][256], int a, int b, int c, int d)