mirror/mbedtls
1
0
Fork 0
mirror of https://github.com/Mbed-TLS/mbedtls.git synced 2025-04-15 23:42:41 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

RSA: improve readability

Browse Source 
Signed-off-by: Janos Follath <janos.follath@arm.com>
This commit is contained in:
Janos Follath 2023-12-27 10:44:36 +00:00
parent c762521e73
commit d83dc85a10
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
library/rsa.c
View File

@ -986,7 +986,7 @@ cleanup:
* Unblind
* T = T * Vf mod N
*/
static int rsa_unblind(mbedtls_mpi *T, mbedtls_mpi *Vf, mbedtls_mpi *N)
static int rsa_unblind(mbedtls_mpi *T, mbedtls_mpi *Vf, const mbedtls_mpi *N)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const mbedtls_mpi_uint mm = mbedtls_mpi_core_montmul_init(N->p);
@ -1075,7 +1075,7 @@ int mbedtls_rsa_private(mbedtls_rsa_context *ctx,
/* Temporaries holding the initial input and the double
* checked result; should be the same in the end. */
mbedtls_mpi I, C;
mbedtls_mpi input_blinded, check_result_blinded;
if (f_rng == NULL) {
return MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
@ -1110,8 +1110,8 @@ int mbedtls_rsa_private(mbedtls_rsa_context *ctx,
mbedtls_mpi_init(&TP); mbedtls_mpi_init(&TQ);
#endif
mbedtls_mpi_init(&I);
mbedtls_mpi_init(&C);
mbedtls_mpi_init(&input_blinded);
mbedtls_mpi_init(&check_result_blinded);
/* End of MPI initialization */
@ -1129,7 +1129,7 @@ int mbedtls_rsa_private(mbedtls_rsa_context *ctx,
MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&T, &T, &ctx->Vi));
MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&T, &T, &ctx->N));
MBEDTLS_MPI_CHK(mbedtls_mpi_copy(&I, &T));
MBEDTLS_MPI_CHK(mbedtls_mpi_copy(&input_blinded, &T));
/*
* Exponent blinding
@ -1194,9 +1194,9 @@ int mbedtls_rsa_private(mbedtls_rsa_context *ctx,
#endif /* MBEDTLS_RSA_NO_CRT */
/* Verify the result to prevent glitching attacks. */
MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&C, &T, &ctx->E,
MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&check_result_blinded, &T, &ctx->E,
&ctx->N, &ctx->RN));
if (mbedtls_mpi_cmp_mpi(&C, &I) != 0) {
if (mbedtls_mpi_cmp_mpi(&check_result_blinded, &input_blinded) != 0) {
ret = MBEDTLS_ERR_RSA_VERIFY_FAILED;
goto cleanup;
}
@ -1234,8 +1234,8 @@ cleanup:
mbedtls_mpi_free(&TP); mbedtls_mpi_free(&TQ);
#endif
mbedtls_mpi_free(&C);
mbedtls_mpi_free(&I);
mbedtls_mpi_free(&check_result_blinded);
mbedtls_mpi_free(&input_blinded);
if (ret != 0 && ret >= -0x007f) {
return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_RSA_PRIVATE_FAILED, ret);