/** * construct a key and iv (if necessary) suitable for use with a * Cipher. */ public static CipherParameters makePBEParameters( PBEKeySpec keySpec, int type, int hash, int keySize, int ivSize) { PBEParametersGenerator generator = makePBEGenerator(type, hash); byte[] key; CipherParameters param; key = convertPassword(type, keySpec); generator.init(key, keySpec.getSalt(), keySpec.getIterationCount()); if (ivSize != 0) { param = generator.generateDerivedParameters(keySize, ivSize); } else { param = generator.generateDerivedParameters(keySize); } for (int i = 0; i != key.length; i++) { key[i] = 0; } return param; }
/** * generate a PBE based key suitable for a MAC algorithm, the * key size is chosen according the MAC size, or the hashing algorithm, * whichever is greater. */ public static CipherParameters makePBEMacParameters( PBEKeySpec keySpec, int type, int hash, int keySize) { PBEParametersGenerator generator = makePBEGenerator(type, hash); byte[] key; CipherParameters param; key = convertPassword(type, keySpec); generator.init(key, keySpec.getSalt(), keySpec.getIterationCount()); param = generator.generateDerivedMacParameters(keySize); for (int i = 0; i != key.length; i++) { key[i] = 0; } return param; }