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-rw-r--r--src/crypto/ctaes/ctaes.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/src/crypto/ctaes/ctaes.c b/src/crypto/ctaes/ctaes.c
index 2389fc0bb2..55962bf252 100644
--- a/src/crypto/ctaes/ctaes.c
+++ b/src/crypto/ctaes/ctaes.c
@@ -134,7 +134,7 @@ static void SubBytes(AES_state *s, int inv) {
D = U7;
}
- /* Non-linear transformation (identical to the code in SubBytes) */
+ /* Non-linear transformation (shared between the forward and backward case) */
M1 = T13 & T6;
M6 = T3 & T16;
M11 = T1 & T15;
@@ -469,9 +469,9 @@ static void AES_encrypt(const AES_state* rounds, int nrounds, unsigned char* cip
static void AES_decrypt(const AES_state* rounds, int nrounds, unsigned char* plain16, const unsigned char* cipher16) {
/* Most AES decryption implementations use the alternate scheme
- * (the Equivalent Inverse Cipher), which looks more like encryption, but
- * needs different round constants. We can't reuse any code here anyway, so
- * don't bother. */
+ * (the Equivalent Inverse Cipher), which allows for more code reuse between
+ * the encryption and decryption code, but requires separate setup for both.
+ */
AES_state s = {{0}};
int round;