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psa_generate_derived_ecc_key_helper: fix bugs found during testing

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Signed-off-by: Przemyslaw Stekiel <przemyslaw.stekiel@mobica.com>
This commit is contained in:
Przemyslaw Stekiel 2021-11-18 11:57:07 +01:00
parent d8cdcba970
commit 653481632e
1 changed files with 3 additions and 2 deletions
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5
library/psa_crypto.c
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@ -4872,6 +4872,7 @@ static psa_status_t psa_generate_derived_ecc_key_helper(
mbedtls_ecc_group_of_psa( curve, bits, 0 );
mbedtls_ecp_group ecp_group;
mbedtls_ecp_group_init( &ecp_group );
if( ( status = mbedtls_ecp_group_load( &ecp_group, grp_id ) ) != 0 )
{
@ -4880,12 +4881,12 @@ static psa_status_t psa_generate_derived_ecc_key_helper(
}
/* N is the boundary of the private key domain. */
N = ecp_group.N;
MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &N, &ecp_group.N ) );
/* Let m be the bit size of N. */
size_t m = ecp_group.nbits;
size_t m_bytes = PSA_BITS_TO_BYTES( m );
if (*data != NULL)
if (*data == NULL)
*data = mbedtls_calloc( 1, m_bytes );
if( *data == NULL )
{