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Merge pull request #6777 from tom-cosgrove-arm/issue-6292-mod_inv

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Bignum: Implement high level fixed width modular inversion
This commit is contained in:
Gilles Peskine
2022-12-17 13:26:02 +01:00
committed by GitHub
parent cf86d70162 f723754f6d
commit e162b4725c
15 changed files with 593 additions and 46 deletions
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12
library/bignum_mod_raw.c
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@ -193,13 +193,13 @@ int mbedtls_mpi_mod_raw_to_mont_rep( mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *m )
{
mbedtls_mpi_uint *T;
const size_t t_limbs = m->limbs * 2 + 1;
const size_t t_limbs = mbedtls_mpi_core_montmul_working_limbs( m->limbs );
if( ( T = (mbedtls_mpi_uint *) mbedtls_calloc( t_limbs, ciL ) ) == NULL )
return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
mbedtls_mpi_core_montmul( X, X, m->rep.mont.rr, m->limbs, m->p, m->limbs,
m->rep.mont.mm, T );
mbedtls_mpi_core_to_mont_rep( X, X, m->p, m->limbs,
m->rep.mont.mm, m->rep.mont.rr, T );
mbedtls_platform_zeroize( T, t_limbs * ciL );
mbedtls_free( T );
@ -209,15 +209,13 @@ int mbedtls_mpi_mod_raw_to_mont_rep( mbedtls_mpi_uint *X,
int mbedtls_mpi_mod_raw_from_mont_rep( mbedtls_mpi_uint *X,
const mbedtls_mpi_mod_modulus *m )
{
const mbedtls_mpi_uint one = 1;
const size_t t_limbs = m->limbs * 2 + 1;
const size_t t_limbs = mbedtls_mpi_core_montmul_working_limbs( m->limbs );
mbedtls_mpi_uint *T;
if( ( T = (mbedtls_mpi_uint *) mbedtls_calloc( t_limbs, ciL ) ) == NULL )
return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
mbedtls_mpi_core_montmul( X, X, &one, 1, m->p, m->limbs,
m->rep.mont.mm, T );
mbedtls_mpi_core_from_mont_rep( X, X, m->p, m->limbs, m->rep.mont.mm, T );
mbedtls_platform_zeroize( T, t_limbs * ciL );
mbedtls_free( T );