NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURNS | SINCE | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON
gnutls_privkey_sign_hash(3) gnutls gnutls_privkey_sign_hash(3)
gnutls_privkey_sign_hash - API function
#include <gnutls/abstract.h> int gnutls_privkey_sign_hash(gnutls_privkey_t signer, gnutls_digest_algorithm_t hash_algo, unsigned int flags, const gnutls_datum_t * hash_data, gnutls_datum_t * signature);
gnutls_privkey_t signer Holds the signer's key gnutls_digest_algorithm_t hash_algo The hash algorithm used unsigned int flags Zero or one of gnutls_privkey_flags_t const gnutls_datum_t * hash_data holds the data to be signed gnutls_datum_t * signature will contain newly allocated signature
This function will sign the given hashed data using a signature algorithm supported by the private key. Signature algorithms are always used together with a hash functions. Different hash functions may be used for the RSA algorithm, but only SHA-XXX for the DSA keys. You may use gnutls_pubkey_get_preferred_hash_algorithm() to determine the hash algorithm. The flags may be GNUTLS_PRIVKEY_SIGN_FLAG_TLS1_RSA or GNUTLS_PRIVKEY_SIGN_FLAG_RSA_PSS. In the former case this function will ignore hash_algo and perform a raw PKCS1 signature, and in the latter an RSA-PSS signature will be generated. Note that, not all algorithm support signing already hashed data. When signing with Ed25519, gnutls_privkey_sign_data() should be used.
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.
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