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Support partial export from mbedtls_ecp_keypair

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Sometimes you don't need to have all the parts of a key pair object. Relax
the behavior of mbedtls_ecp_keypair so that you can extract just the parts
that you need.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2023-06-21 18:24:04 +02:00
parent e6886102ef
commit ba5b5d67aa
3 changed files with 23 additions and 6 deletions
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6
library/ecp.c
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@ -3371,15 +3371,15 @@ int mbedtls_ecp_export(const mbedtls_ecp_keypair *key, mbedtls_ecp_group *grp,
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if ((ret = mbedtls_ecp_group_copy(grp, &key->grp)) != 0) {
if (grp != NULL && (ret = mbedtls_ecp_group_copy(grp, &key->grp)) != 0) {
return ret;
}
if ((ret = mbedtls_mpi_copy(d, &key->d)) != 0) {
if (d != NULL && (ret = mbedtls_mpi_copy(d, &key->d)) != 0) {
return ret;
}
if ((ret = mbedtls_ecp_copy(Q, &key->Q)) != 0) {
if (Q != NULL && (ret = mbedtls_ecp_copy(Q, &key->Q)) != 0) {
return ret;
}