How can I get the signature of a string using SHA1withRSA
if I already have the Private Key as byte[]
or String
?
public static String sign(String samlResponseString, String keystoreFile, String keyStorePassword, String privateKeyPassword, String alias)
throws NoSuchAlgorithmException, UnsupportedEncodingException,
InvalidKeyException, SignatureException {
PrivateKey pkey=getPrivateKey( keystoreFile, keyStorePassword, privateKeyPassword, alias);
String signedString = null;
Signature signature = Signature.getInstance("SHA256withRSA");
signature.initSign(pkey);
signature.update(samlResponseString.getBytes());
byte[] signatureBytes = signature.sign();
byte[] encryptedByteValue = Base64.encodeBase64(signatureBytes);
signedString = new String(encryptedByteValue, "UTF-8");
System.out.println(signedString);
return signedString;
}