EVP_PKEY_asn1_find, EVP_PKEY_asn1_find_str, EVP_PKEY_asn1_get_count, EVP_PKEY_asn1_get0, EVP_PKEY_asn1_get0_info - enumerate public key ASN.1 methods
#include <openssl/evp.h> int EVP_PKEY_asn1_get_count(void); const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_get0(int idx); const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pe, int type); const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str(ENGINE **pe, const char *str, int len); int EVP_PKEY_asn1_get0_info(int *ppkey_id, int *pkey_base_id, int *ppkey_flags, const char **pinfo, const char **ppem_str, const EVP_PKEY_ASN1_METHOD *ameth);
EVP_PKEY_asn1_count() returns a count of the number of public key ASN.1 methods available: it includes standard methods and any methods added by the application.
EVP_PKEY_asn1_get0() returns the public key ASN.1 method idx. The value of idx must be between zero and EVP_PKEY_asn1_get_count() - 1.
EVP_PKEY_asn1_find() looks up the EVP_PKEY_ASN1_METHOD with NID type. If pe isn't NULL, then it will look up an engine implementing a EVP_PKEY_ASN1_METHOD for the NID type and return that instead, and also set *pe to point at the engine that implements it.
EVP_PKEY_asn1_find_str() looks up the EVP_PKEY_ASN1_METHOD with PEM type string str. Just like EVP_PKEY_asn1_find(), if pe isn't NULL, then it will look up an engine implementing a EVP_PKEY_ASN1_METHOD for the NID type and return that instead, and also set *pe to point at the engine that implements it.
EVP_PKEY_asn1_get0_info() returns the public key ID, base public key ID (both NIDs), any flags, the method description and PEM type string associated with the public key ASN.1 method *ameth.
EVP_PKEY_asn1_count(), EVP_PKEY_asn1_get0(), EVP_PKEY_asn1_find() and EVP_PKEY_asn1_find_str() are not thread safe, but as long as all EVP_PKEY_ASN1_METHOD objects are added before the application gets threaded, using them is safe. See EVP_PKEY_asn1_add0(3).
EVP_PKEY_asn1_count() returns the number of available public key methods.
EVP_PKEY_asn1_get0() return a public key method or NULL if idx is out of range.
EVP_PKEY_asn1_get0_info() returns 0 on failure, 1 on success.
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