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Predicate rsa_sign/4 |
sha1
, sha224
, sha256
, sha384
or sha512
. The default is a cryptographically secure
algorithm. If you specify a variable, then it is unified with the
algorithm that was used.hex
.
Alternatives are octet
, utf8
and text
.
This predicate can be used to compute a sha256WithRSAEncryption
signature as follows:
sha256_with_rsa(PemKeyFile, Password, Data, Signature) :- Algorithm = sha256, read_key(PemKeyFile, Password, Key), crypto_data_hash(Data, Hash, [algorithm(Algorithm), encoding(octet)]), rsa_sign(Key, Hash, Signature, [type(Algorithm)]). read_key(File, Password, Key) :- setup_call_cleanup( open(File, read, In, [type(binary)]), load_private_key(In, Password, Key), close(In)).
Note that a hash that is computed by crypto_data_hash/3 can be directly used in rsa_sign/4 as well as ecdsa_sign/4.