/** 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;
if (type == PKCS12) {
key = PBEParametersGenerator.PKCS12PasswordToBytes(keySpec.getPassword());
} else {
key = PBEParametersGenerator.PKCS5PasswordToBytes(keySpec.getPassword());
}
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(
BCPBEKey pbeKey, AlgorithmParameterSpec spec) {
if ((spec == null) || !(spec instanceof PBEParameterSpec)) {
throw new IllegalArgumentException("Need a PBEParameter spec with a PBE key.");
}
PBEParameterSpec pbeParam = (PBEParameterSpec) spec;
PBEParametersGenerator generator = makePBEGenerator(pbeKey.getType(), pbeKey.getDigest());
byte[] key = pbeKey.getEncoded();
CipherParameters param;
if (pbeKey.shouldTryWrongPKCS12()) {
key = new byte[2];
}
generator.init(key, pbeParam.getSalt(), pbeParam.getIterationCount());
param = generator.generateDerivedMacParameters(pbeKey.getKeySize());
for (int i = 0; i != key.length; i++) {
key[i] = 0;
}
return param;
}
static SecretKey generateSecretKeyForPKCS5Scheme2(
String algorithm, char[] password, byte[] salt, int iterationCount) {
PBEParametersGenerator generator = new PKCS5S2ParametersGenerator();
generator.init(PBEParametersGenerator.PKCS5PasswordToBytes(password), salt, iterationCount);
return new SecretKeySpec(
((KeyParameter) generator.generateDerivedParameters(PEMUtilities.getKeySize(algorithm)))
.getKey(),
algorithm);
}
private static CipherParameters extractPBES2CipherParams(
char[] password, PBES2Parameters pbeParams) {
PBKDF2Params pbkdfParams =
PBKDF2Params.getInstance(pbeParams.getKeyDerivationFunc().getParameters());
int keySize = 192;
if (pbkdfParams.getKeyLength() != null) {
keySize = pbkdfParams.getKeyLength().intValue() * 8;
}
int iterationCount = pbkdfParams.getIterationCount().intValue();
byte[] salt = pbkdfParams.getSalt();
PBEParametersGenerator generator = new PKCS5S2ParametersGenerator();
generator.init(PBEParametersGenerator.PKCS5PasswordToBytes(password), salt, iterationCount);
return generator.generateDerivedParameters(keySize);
}
/**
* 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;
}
/** construct a key and iv (if necessary) suitable for use with a Cipher. */
public static CipherParameters makePBEParameters(
BCPBEKey pbeKey, AlgorithmParameterSpec spec, String targetAlgorithm) {
if ((spec == null) || !(spec instanceof PBEParameterSpec)) {
throw new IllegalArgumentException("Need a PBEParameter spec with a PBE key.");
}
PBEParameterSpec pbeParam = (PBEParameterSpec) spec;
PBEParametersGenerator generator = makePBEGenerator(pbeKey.getType(), pbeKey.getDigest());
byte[] key = pbeKey.getEncoded();
CipherParameters param;
if (pbeKey.shouldTryWrongPKCS12()) {
key = new byte[2];
}
generator.init(key, pbeParam.getSalt(), pbeParam.getIterationCount());
if (pbeKey.getIvSize() != 0) {
param = generator.generateDerivedParameters(pbeKey.getKeySize(), pbeKey.getIvSize());
} else {
param = generator.generateDerivedParameters(pbeKey.getKeySize());
}
if (targetAlgorithm.startsWith("DES")) {
if (param instanceof ParametersWithIV) {
KeyParameter kParam = (KeyParameter) ((ParametersWithIV) param).getParameters();
DESParameters.setOddParity(kParam.getKey());
} else {
KeyParameter kParam = (KeyParameter) param;
DESParameters.setOddParity(kParam.getKey());
}
}
for (int i = 0; i != key.length; i++) {
key[i] = 0;
}
return param;
}
