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esp_bignum: move check for supported MPI bits at start of API

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This can allow hardware MPI API to return as soon as it identifies
that it can handle require bitlength operation.
This commit is contained in:
Mahavir Jain 2021-11-26 14:24:30 +05:30
parent 1cae1fc18e
commit 7a8c8f8576
1 changed files with 8 additions and 8 deletions
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16
components/mbedtls/port/esp_bignum.c
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@ -277,19 +277,23 @@ cleanup2:
static int esp_mpi_exp_mod( mbedtls_mpi *Z, const mbedtls_mpi *X, const mbedtls_mpi *Y, const mbedtls_mpi *M, mbedtls_mpi *_Rinv )
{
int ret = 0;
mbedtls_mpi Rinv_new; /* used if _Rinv == NULL */
mbedtls_mpi *Rinv; /* points to _Rinv (if not NULL) othwerwise &RR_new */
mbedtls_mpi_uint Mprime;
size_t x_words = mpi_words(X);
size_t y_words = mpi_words(Y);
size_t m_words = mpi_words(M);
/* "all numbers must be the same length", so choose longest number
as cardinal length of operation...
*/
size_t num_words = esp_mpi_hardware_words(MAX(m_words, MAX(x_words, y_words)));
mbedtls_mpi Rinv_new; /* used if _Rinv == NULL */
mbedtls_mpi *Rinv; /* points to _Rinv (if not NULL) othwerwise &RR_new */
mbedtls_mpi_uint Mprime;
if (num_words * 32 > SOC_RSA_MAX_BIT_LEN) {
return MBEDTLS_ERR_MPI_NOT_ACCEPTABLE;
}
if (mbedtls_mpi_cmp_int(M, 0) <= 0 || (M->p[0] & 1) == 0) {
return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
@ -303,10 +307,6 @@ static int esp_mpi_exp_mod( mbedtls_mpi *Z, const mbedtls_mpi *X, const mbedtls_
return mbedtls_mpi_lset(Z, 1);
}
if (num_words * 32 > SOC_RSA_MAX_BIT_LEN) {
return MBEDTLS_ERR_MPI_NOT_ACCEPTABLE;
}
/* Determine RR pointer, either _RR for cached value
or local RR_new */
if (_Rinv == NULL) {