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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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34
library/bignum_core.c
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@ -824,6 +824,40 @@ mbedtls_mpi_uint mbedtls_mpi_core_sub_int( mbedtls_mpi_uint *X,
return( c );
}
mbedtls_mpi_uint mbedtls_mpi_core_check_zero_ct( const mbedtls_mpi_uint *A,
size_t limbs )
{
mbedtls_mpi_uint bits = 0;
for( size_t i = 0; i < limbs; i++ )
bits |= A[i];
return( bits );
}
void mbedtls_mpi_core_to_mont_rep( mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *N,
size_t AN_limbs,
mbedtls_mpi_uint mm,
const mbedtls_mpi_uint *rr,
mbedtls_mpi_uint *T )
{
mbedtls_mpi_core_montmul( X, A, rr, AN_limbs, N, AN_limbs, mm, T );
}
void mbedtls_mpi_core_from_mont_rep( mbedtls_mpi_uint *X,
const mbedtls_mpi_uint *A,
const mbedtls_mpi_uint *N,
size_t AN_limbs,
mbedtls_mpi_uint mm,
mbedtls_mpi_uint *T )
{
const mbedtls_mpi_uint Rinv = 1; /* 1/R in Mont. rep => 1 */
mbedtls_mpi_core_montmul( X, A, &Rinv, 1, N, AN_limbs, mm, T );
}
/* END MERGE SLOT 3 */
/* BEGIN MERGE SLOT 4 */