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Use mbedtls_xor_no_simd from cmac and cbc

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-06-15 18:44:16 +01:00
parent 03bb526c24
commit a0b166e11e
2 changed files with 7 additions and 21 deletions
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24
library/aes.c
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@ -1040,23 +1040,6 @@ int mbedtls_aes_crypt_ecb(mbedtls_aes_context *ctx,
#if defined(MBEDTLS_CIPHER_MODE_CBC)
#if defined(__ARM_NEON) && defined(__aarch64__)
/* Avoid using the NEON implementation of mbedtls_xor. Because of the dependency on
* the result for the next block in CBC, and the cost of transferring that data from
* NEON registers, it is faster to use the following on aarch64.
* For 32-bit arm, NEON should be faster. */
#define CBC_XOR_16(r, a, b) do { \
mbedtls_put_unaligned_uint64(r, \
mbedtls_get_unaligned_uint64(a) ^ \
mbedtls_get_unaligned_uint64(b)); \
mbedtls_put_unaligned_uint64(r + 8, \
mbedtls_get_unaligned_uint64(a + 8) ^ \
mbedtls_get_unaligned_uint64(b + 8)); \
} while (0)
#else
#define CBC_XOR_16(r, a, b) mbedtls_xor(r, a, b, 16)
#endif
/*
* AES-CBC buffer encryption/decryption
*/
@ -1099,7 +1082,10 @@ int mbedtls_aes_crypt_cbc(mbedtls_aes_context *ctx,
if (ret != 0) {
goto exit;
}
CBC_XOR_16(output, output, iv);
/* Avoid using the NEON implementation of mbedtls_xor. Because of the dependency on
* the result for the next block in CBC, and the cost of transferring that data from
* NEON registers, NEON is slower on aarch64. */
mbedtls_xor_no_simd(output, output, iv, 16);
memcpy(iv, temp, 16);
@ -1109,7 +1095,7 @@ int mbedtls_aes_crypt_cbc(mbedtls_aes_context *ctx,
}
} else {
while (length > 0) {
CBC_XOR_16(output, input, ivp);
mbedtls_xor_no_simd(output, input, ivp, 16);
ret = mbedtls_aes_crypt_ecb(ctx, mode, output, output);
if (ret != 0) {

4
library/cmac.c
View File

@ -237,7 +237,7 @@ int mbedtls_cipher_cmac_update(mbedtls_cipher_context_t *ctx,
input,
block_size - cmac_ctx->unprocessed_len);
mbedtls_xor(state, cmac_ctx->unprocessed_block, state, block_size);
mbedtls_xor_no_simd(state, cmac_ctx->unprocessed_block, state, block_size);
if ((ret = mbedtls_cipher_update(ctx, state, block_size, state,
&olen)) != 0) {
@ -255,7 +255,7 @@ int mbedtls_cipher_cmac_update(mbedtls_cipher_context_t *ctx,
/* Iterate across the input data in block sized chunks, excluding any
* final partial or complete block */
for (j = 1; j < n; j++) {
mbedtls_xor(state, input, state, block_size);
mbedtls_xor_no_simd(state, input, state, block_size);
if ((ret = mbedtls_cipher_update(ctx, state, block_size, state,
&olen)) != 0) {