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Merge pull request #6941 from gabor-mezei-arm/6375_quasi-reduction_function

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Add function to fix quasi-reduction
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Gilles Peskine 2023-01-31 11:25:25 +01:00 • committed by GitHub
commit 470f10cfc5
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 144 additions and 1 deletions
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15
library/bignum_mod_raw.c
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@ -33,6 +33,8 @@
#include "bignum_mod.h"
#include "constant_time_internal.h"
#include "bignum_mod_raw_invasive.h"
void mbedtls_mpi_mod_raw_cond_assign(mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_mod_modulus *N,
@ -118,6 +120,19 @@ void mbedtls_mpi_mod_raw_sub(mbedtls_mpi_uint *X,
(void) mbedtls_mpi_core_add_if(X, N->p, N->limbs, (unsigned) c);
}
#if defined(MBEDTLS_TEST_HOOKS)
MBEDTLS_STATIC_TESTABLE
void mbedtls_mpi_mod_raw_fix_quasi_reduction(mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *N)
{
mbedtls_mpi_uint c = mbedtls_mpi_core_sub(X, X, N->p, N->limbs);
(void) mbedtls_mpi_core_add_if(X, N->p, N->limbs, (unsigned) c);
}
#endif /* MBEDTLS_TEST_HOOKS */
void mbedtls_mpi_mod_raw_mul(mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *B,