Java Language
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Java Language Security & Cryptography Compute and Verify Digital Signatures
Example
To compute a signature:
final PrivateKey privateKey = keyPair.getPrivate();
final byte[] data = "FOO BAR".getBytes();
final Signature signer = Signature.getInstance("SHA1withRSA");
signer.initSign(privateKey);
signer.update(data);
final byte[] signature = signer.sign();
Note that the signature algorithm must be compatible with the algorithm used to generate the key pair.
To verify a signature:
final PublicKey publicKey = keyPair.getPublic();
final Signature verifier = Signature.getInstance("SHA1withRSA");
verifier.initVerify(publicKey);
verifier.update(data);
System.out.println("Signature: " + verifier.verify(signature));
Produces this output:
Signature: true
