Java Language
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Java Language Security & Cryptography Generate Public / Private Key Pairs
Example
To generate key pairs using different algorithms and key sizes:
final KeyPairGenerator dhGenerator = KeyPairGenerator.getInstance("DiffieHellman");
final KeyPairGenerator dsaGenerator = KeyPairGenerator.getInstance("DSA");
final KeyPairGenerator rsaGenerator = KeyPairGenerator.getInstance("RSA");
dhGenerator.initialize(1024);
dsaGenerator.initialize(1024);
rsaGenerator.initialize(2048);
final KeyPair dhPair = dhGenerator.generateKeyPair();
final KeyPair dsaPair = dsaGenerator.generateKeyPair();
final KeyPair rsaPair = rsaGenerator.generateKeyPair();
Additional algorithms and key sizes may be available on your implementation of the Java platform.
To specify a source of randomness to use when generating the keys:
final KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
generator.initialize(2048, SecureRandom.getInstance("SHA1PRNG", "SUN"));
final KeyPair pair = generator.generateKeyPair();
