Java Utililty Methods Key Pair Create

List of utility methods to do Key Pair Create

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Description

The list of methods to do Key Pair Create are organized into topic(s).

Method

voidgenerateKeyPair(String keyAlgorithm, int keySize)
generate Key Pair 
KeyPairGenerator kpg = KeyPairGenerator.getInstance(keyAlgorithm); 
kpg.initialize(keySize); 
KeyPair kp = kpg.generateKeyPair();
System.out.println("-----BEGIN PRIVATE KEY-----");
System.out.println(Base64.getMimeEncoder().encodeToString(kp.getPrivate().getEncoded()));
System.out.println("-----END PRIVATE KEY-----");
System.out.println("-----BEGIN PUBLIC KEY-----");
System.out.println(Base64.getMimeEncoder().encodeToString(kp.getPublic().getEncoded()));
...
KeyPairgenerateKeyPair(String type, int size)
generate Key Pair 
KeyPairGenerator keyGen = KeyPairGenerator.getInstance(type);
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
keyGen.initialize(size, random);
random.setSeed(System.currentTimeMillis());
return keyGen.generateKeyPair();
KeyPairgenerateKeys(int size)
generate Keys 
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(size);
KeyPair kp = kpg.genKeyPair();
return kp;
KeyManagerFactorygenerateKeyStoreFromPEM(File certFile, File keyFile)
Creates a KeyManagerFactory from PEM files (something java should just do...). 
char[] password = UUID.randomUUID().toString().toCharArray();
try {
    List<X509Certificate> certs = getPEMFileCerts(certFile);
    RSAPrivateKey key = getPEMFileKey(keyFile);
    KeyStore keystore = KeyStore.getInstance("JKS");
    keystore.load(null);
    for (int i = 0; i < certs.size(); i++) {
        keystore.setCertificateEntry("cert-" + i, certs.get(i));
...
byte[]generateKeyZ(ECPrivateKey privateKey, ECPublicKey publicKey)
generate Key Z 
try {
    KeyAgreement ka = KeyAgreement.getInstance("ECDH");
    ka.init(privateKey);
    ka.doPhase(publicKey, true);
    return ka.generateSecret();
} catch (Exception ex) {
    throw new SecurityException(ex);