EVP_PKEY_asn1_add0(): Check that this method isn't already registered
No two public key ASN.1 methods with the same pkey_id can be
registered at the same time.
@@ -137,6 +137,11 @@ const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str(ENGINE **pe,
int EVP_PKEY_asn1_add0(const EVP_PKEY_ASN1_METHOD *ameth)
{
+ if (pkey_asn1_find(ameth->pkey_id) != NULL) {
+ EVPerr(EVP_F_EVP_PKEY_ASN1_ADD0,
+ EVP_R_PKEY_ASN1_METHOD_ALREADY_REGISTERED);
+ return 0;
+ }
if (app_methods == NULL) {
app_methods = sk_EVP_PKEY_ASN1_METHOD_new(ameth_cmp);
if (app_methods == NULL)
