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Use mbedtls_mpi_lset() more

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Signed-off-by: Janos Follath <janos.follath@arm.com>
This commit is contained in:
Janos Follath 2021-06-24 15:00:33 +01:00
parent bc96a79854
commit 1c6a439783
1 changed files with 4 additions and 6 deletions
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10
library/ecp_curves.c
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@ -648,7 +648,7 @@ static int ecp_mod_p256k1( mbedtls_mpi * );
#if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
/* Constants used by ecp_use_curve25519() */
static const unsigned char curve25519_a24[] = { 0x01, 0xDB, 0x42 };
static const mbedtls_mpi_sint curve25519_a24 = 0x01DB42;
static const unsigned char curve25519_part_of_n[] = {
0x14, 0xDE, 0xF9, 0xDE, 0xA2, 0xF7, 0x9C, 0xD6,
0x58, 0x12, 0x63, 0x1A, 0x5C, 0xF5, 0xD3, 0xED,
@ -662,8 +662,7 @@ static int ecp_use_curve25519( mbedtls_ecp_group *grp )
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/* Actually ( A + 2 ) / 4 */
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &grp->A,
curve25519_a24, sizeof( curve25519_a24 ) ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &grp->A, curve25519_a24 ) );
/* P = 2^255 - 19 */
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &grp->P, 1 ) );
@ -695,7 +694,7 @@ cleanup:
#if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
/* Constants used by ecp_use_curve448() */
static const unsigned char curve448_a24[] = { 0x98, 0xAA };
static const mbedtls_mpi_sint curve448_a24 = 0x98AA;
static const unsigned char curve448_part_of_n[] = {
0x83, 0x35, 0xDC, 0x16, 0x3B, 0xB1, 0x24,
0xB6, 0x51, 0x29, 0xC9, 0x6F, 0xDE, 0x93,
@ -714,8 +713,7 @@ static int ecp_use_curve448( mbedtls_ecp_group *grp )
mbedtls_mpi_init( &Ns );
/* Actually ( A + 2 ) / 4 */
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &grp->A,
curve448_a24, sizeof( curve448_a24 ) ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &grp->A, curve448_a24 ) );
/* P = 2^448 - 2^224 - 1 */
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &grp->P, 1 ) );