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Make a public version of mpi_montg_init() in bignum_new.c and add unit tests

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The unit tests were created by capturing runs of the existing function during
execution of existing unit tests.

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Tom Cosgrove
2022-08-17 06:17:00 +01:00
parent 659c84add9
commit 79b70f6394
5 changed files with 108 additions and 11 deletions
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11
library/bignum.c
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@ -1550,16 +1550,7 @@ int mbedtls_mpi_mod_int( mbedtls_mpi_uint *r, const mbedtls_mpi *A, mbedtls_mpi_
*/
static void mpi_montg_init( mbedtls_mpi_uint *mm, const mbedtls_mpi *N )
{
mbedtls_mpi_uint x, m0 = N->p[0];
unsigned int i;
x = m0;
x += ( ( m0 + 2 ) & 4 ) << 1;
for( i = biL; i >= 8; i /= 2 )
x *= ( 2 - ( m0 * x ) );
*mm = ~x + 1;
*mm = mbedtls_mpi_montg_init( N->p[0] );
}
/** Montgomery multiplication: A = A * B * R^-1 mod N (HAC 14.36)