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copied!<p>If you're using BouncyCastle, try the following:</p> <pre><code>import java.io.File; import java.io.FileReader; import java.io.IOException; import java.security.KeyPair; import java.security.Security; import java.security.Signature; import java.util.Arrays; import org.bouncycastle.jce.provider.BouncyCastleProvider; import org.bouncycastle.openssl.PEMReader; import org.bouncycastle.openssl.PasswordFinder; import org.bouncycastle.util.encoders.Hex; public class SignatureExample { public static void main(String [] args) throws Exception { Security.addProvider(new BouncyCastleProvider()); String message = "hello world"; File privateKey = new File("private.pem"); KeyPair keyPair = readKeyPair(privateKey, "password".toCharArray()); Signature signature = Signature.getInstance("SHA256WithRSAEncryption"); signature.initSign(keyPair.getPrivate()); signature.update(message.getBytes()); byte [] signatureBytes = signature.sign(); System.out.println(new String(Hex.encode(signatureBytes))); Signature verifier = Signature.getInstance("SHA256WithRSAEncryption"); verifier.initVerify(keyPair.getPublic()); verifier.update(message.getBytes()); if (verifier.verify(signatureBytes)) { System.out.println("Signature is valid"); } else { System.out.println("Signature is invalid"); } } private static KeyPair readKeyPair(File privateKey, char [] keyPassword) throws IOException { FileReader fileReader = new FileReader(privateKey); PEMReader r = new PEMReader(fileReader, new DefaultPasswordFinder(keyPassword)); try { return (KeyPair) r.readObject(); } catch (IOException ex) { throw new IOException("The private key could not be decrypted", ex); } finally { r.close(); fileReader.close(); } } private static class DefaultPasswordFinder implements PasswordFinder { private final char [] password; private DefaultPasswordFinder(char [] password) { this.password = password; } @Override public char[] getPassword() { return Arrays.copyOf(password, password.length); } } } </code></pre>

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