Java Utililty Methods RSA

List of utility methods to do RSA

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Description

The list of methods to do RSA are organized into topic(s).

Method

KeyPairgenerateRsaKeyPair(int keysize)
generate Rsa Key Pair 
try {
    KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
    generator.initialize(keysize);
    KeyPair keyPair = generator.generateKeyPair();
    return keyPair;
} catch (Exception e) {
    throw new RuntimeException(e);
KeyStoregenerateRSAKeypairAndKeystore(String fullyQualifiedDN, Date endDate, String keystoreLocation, String keyPairAlias, String keypairPassword, String keystorePassword)
generate RSA Keypair And Keystore 
KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
keyStore.load(null, null);
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
keyGen.initialize(2048, random);
KeyPair keyPair = keyGen.generateKeyPair();
X509Certificate cert = generateX509Certificate(fullyQualifiedDN, keyPair, endDate, "SHA1withRSA");
keyStore.setKeyEntry(keyPairAlias, keyPair.getPrivate(), keypairPassword.toCharArray(),
...
RSAPublicKeygenerateRsaPublicKey(BigInteger modulus, BigInteger publicExponent)
generate Rsa Public Key 
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
return (RSAPublicKey) keyFactory.generatePublic(new RSAPublicKeySpec(modulus, publicExponent));
RSAPublicKeygenerateRSAPublicKey(final BigInteger modulus, final BigInteger publicExponent)
generate RSA Public Key 
RSAPublicKeySpec keySpec = new RSAPublicKeySpec(modulus, publicExponent);
KeyFactory kf = getKeyFactory("RSA");
return (RSAPublicKey) kf.generatePublic(keySpec);
StringgenerateRSASHA1Signature(PrivateKey privateKey, String data)
Computes RSA-SHA1 signature. 
byte[] rsaSha1Data = null;
try {
    Signature signature = Signature.getInstance("SHA1withRSA");
    signature.initSign(privateKey);
    signature.update(data.getBytes("UTF-8"));
    rsaSha1Data = signature.sign();
    return new BASE64Encoder().encode(rsaSha1Data);
} catch (UnsupportedEncodingException e) {
...
StringgenerateSaltedHMAC(String accessKey, String userSalt, Mac mac)
generate Salted HMAC 
byte[] bytes = mac.doFinal((accessKey + ":" + userSalt).getBytes("ASCII"));
return DatatypeConverter.printBase64Binary(bytes);
KeyStoregetPemKeyStore(File file)
get Pem Key Store 
KeyStore store = KeyStore.getInstance(KeyStore.getDefaultType());
store.load(null);
if (file != null) {
    byte[] certAndKey = Files.readAllBytes(file.toPath());
    byte[] certBytes = parseDERFromPEM(certAndKey, "-----BEGIN .*CERTIFICATE-----",
            "-----END .*CERTIFICATE-----");
    byte[] pvtKeyBytes = parseDERFromPEM(certAndKey, "-----BEGIN .*PRIVATE KEY-----",
            "-----END .*PRIVATE KEY-----");
...