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improve cbc encrypt perf

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Signed-off-by: Dave Rodgman <dave.rodgman@gmail.com>
This commit is contained in:
Dave Rodgman 2023-06-04 12:00:11 -04:00 committed by Dave Rodgman
parent 3f47b3f7a3
commit f1e396c427
1 changed files with 3 additions and 6 deletions
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9
library/aes.c
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@ -1068,8 +1068,6 @@ int mbedtls_aes_crypt_cbc(mbedtls_aes_context *ctx,
} }
#endif #endif
const unsigned char *ivp = iv;
if (mode == MBEDTLS_AES_DECRYPT) { if (mode == MBEDTLS_AES_DECRYPT) {
unsigned char temp2[16]; unsigned char temp2[16];
while (length > 0) { while (length > 0) {
@ -1089,19 +1087,18 @@ int mbedtls_aes_crypt_cbc(mbedtls_aes_context *ctx,
} }
} else { } else {
while (length > 0) { while (length > 0) {
mbedtls_xor(output, input, ivp, 16); mbedtls_xor(temp, input, iv, 16);
ret = mbedtls_aes_crypt_ecb(ctx, mode, output, output); ret = mbedtls_aes_crypt_ecb(ctx, mode, temp, iv);
memcpy(output, iv, 16);
if (ret != 0) { if (ret != 0) {
goto exit; goto exit;
} }
ivp = output;
input += 16; input += 16;
output += 16; output += 16;
length -= 16; length -= 16;
} }
memcpy(iv, ivp, 16);
} }
ret = 0; ret = 0;