libressl-X509_check_private_key3
Compare public key components
Usage
Crypto Library (libcrypto, -lcrypto)
#include <openssl/x509.h>
int
X509_check_private_key(const X509 *x, const EVP_PKEY *k);
int
X509_REQ_check_private_key(X509_REQ *x, EVP_PKEY *k);
Overview
These functions are seriously misnamed. X509_check_private_key() compares the public key components (e.g. exponent and modulus of an RSA key) and parameters (e.g. EC params of an EC key) of k with the corresponding properties of x. Despite the name, it neither checks whether k contains private key components at all, nor, if any are present, whether they are consistent with the public key components.
X509_REQ_check_private_key() is equivalent to X509_check_private_key() except that it compares to the public key contained in a certificate request.
Return values
These functions return 1 if the public key components and parameters match, or 0 if they do not or if an error occurs. On error or mismatch, a reason code can be obtained using ERR_get_error(3).