X509_GET_PUBKEY - Online Linux Manual PageSection : 3ossl
Updated : 2022-03-15
Source : 3.0.2
Note : OpenSSL
NAMEX509_get_pubkey, X509_get0_pubkey, X509_set_pubkey, X509_get_X509_PUBKEY, X509_REQ_get_pubkey, X509_REQ_get0_pubkey, X509_REQ_set_pubkey, X509_REQ_get_X509_PUBKEY − get or set certificate or certificate request public key
SYNOPSIS​ #include <openssl/x509.h> ​ ​ EVP_PKEY *X509_get_pubkey(X509 *x); ​ EVP_PKEY *X509_get0_pubkey(const X509 *x); ​ int X509_set_pubkey(X509 *x, EVP_PKEY *pkey); ​ X509_PUBKEY *X509_get_X509_PUBKEY(const X509 *x); ​ ​ EVP_PKEY *X509_REQ_get_pubkey(X509_REQ *req); ​ EVP_PKEY *X509_REQ_get0_pubkey(X509_REQ *req); ​ int X509_REQ_set_pubkey(X509_REQ *x, EVP_PKEY *pkey); ​ X509_PUBKEY *X509_REQ_get_X509_PUBKEY(X509_REQ *x);
DESCRIPTION​X509_get_pubkey() attempts to decode the public key for certificate x. If successful it returns the public key as an EVP_PKEY pointer with its reference count incremented: this means the returned key must be freed up after use. X509_get0_pubkey() is similar except it does not increment the reference count of the returned EVP_PKEY so it must not be freed up after use. ​X509_get_X509_PUBKEY() returns an internal pointer to the X509_PUBKEY structure which encodes the certificate of x. The returned value must not be freed up after use. ​X509_set_pubkey() attempts to set the public key for certificate x to ​pkey. The key pkey should be freed up after use. ​X509_REQ_get_pubkey(), X509_REQ_get0_pubkey(), X509_REQ_set_pubkey() and ​X509_REQ_get_X509_PUBKEY() are similar but operate on certificate request req.
NOTESThe first time a public key is decoded the EVP_PKEY structure is cached in the certificate or certificate request itself. Subsequent calls return the cached structure with its reference count incremented to improve performance.
RETURN VALUES​X509_get_pubkey(), X509_get0_pubkey(), X509_get_X509_PUBKEY(), ​X509_REQ_get_pubkey() and X509_REQ_get_X509_PUBKEY() return a public key or ​NULL if an error occurred. ​X509_set_pubkey() and X509_REQ_set_pubkey() return 1 for success and 0 for failure.
SEE ALSO​d2i_X509 (3), ​ERR_get_error (3), ​X509_CRL_get0_by_serial (3), ​X509_get0_signature (3), ​X509_get_ext_d2i (3), ​X509_get_extension_flags (3), ​X509_get_subject_name (3), ​X509_get_version (3), ​X509_NAME_add_entry_by_txt (3), ​X509_NAME_ENTRY_get_object (3), ​X509_NAME_get_index_by_NID (3), ​X509_NAME_print_ex (3), ​X509_new (3), ​X509_sign (3), ​X509V3_get_d2i (3), ​X509_verify_cert (3)
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