/**
* Converts a PEM-encoded PKCS#8 private key into an RSAPrivateKey instance useable with JCE
*
* @param privateKey private key in PKCS#8 format and PEM-encoded
* @return RSAPrivateKey instance containing the key
*/
private static RSAPrivateKey rsaPrivateKeyDecode(final String privateKey) {
try {
final KeyFactory keyFactory = KeyFactory.getInstance("RSA");
final KeySpec ks = new PKCS8EncodedKeySpec(Base64.decodePadded(privateKey));
return (RSAPrivateKey) keyFactory.generatePrivate(ks);
} catch (final Exception e) {
throw new RuntimeException("Failed to decode built-in private key", e);
}
}
// encrypts string
public String encrypt(String toEncrypt) {
try {
// encrypt
byte[] bytes = toEncrypt.getBytes("ASCII");
byte[] encoded = encryptionCipher.doFinal(bytes);
return Base64.encode(encoded);
} catch (Exception e) {
System.out.println("Encryption Error: " + e);
}
return null;
}
// decrypts string
public String decrypt(String toDecrypt) {
try {
// see the above comment for rant, replacing Encoder with Decoder... kthxbye
// note: "above comment" no longer exists
byte[] decoded = Base64.decode(toDecrypt);
// decrypt
byte[] bytes = decryptionCipher.doFinal(decoded);
return new String(bytes, "ASCII");
} catch (Exception e) {
System.out.println("Decryption Error: " + e);
e.printStackTrace();
}
return null;
}