//
// basic key check
//
if (!(key instanceof SecretKey))
{
throw new InvalidKeyException("Key for algorithm " + key.getAlgorithm() + " not suitable for symmetric enryption.");
}
//
// for RC5-64 we must have some default parameters
//
if (params == null && baseEngine.getAlgorithmName().startsWith("RC5-64"))
{
throw new InvalidAlgorithmParameterException("RC5 requires an RC5ParametersSpec to be passed in.");
}
//
// a note on iv's - if ivLength is zero the IV gets ignored (we don't use it).
//
if (key instanceof BCPBEKey)
{
BCPBEKey k = (BCPBEKey)key;
if (k.getOID() != null)
{
pbeAlgorithm = k.getOID().getId();
}
else
{
pbeAlgorithm = k.getAlgorithm();
}
if (k.getParam() != null)
{
param = k.getParam();
if (params instanceof IvParameterSpec)
{
IvParameterSpec iv = (IvParameterSpec)params;
param = new ParametersWithIV(param, iv.getIV());
}
}
else if (params instanceof PBEParameterSpec)
{
pbeSpec = (PBEParameterSpec)params;
param = PBE.Util.makePBEParameters(k, params, cipher.getUnderlyingCipher().getAlgorithmName());
}
else
{
throw new InvalidAlgorithmParameterException("PBE requires PBE parameters to be set.");
}
if (param instanceof ParametersWithIV)
{
ivParam = (ParametersWithIV)param;
}
}
else if (params == null)
{
param = new KeyParameter(key.getEncoded());
}
else if (params instanceof IvParameterSpec)
{
if (ivLength != 0)
{
IvParameterSpec p = (IvParameterSpec)params;
if (p.getIV().length != ivLength && !isAEADModeName(modeName))
{
throw new InvalidAlgorithmParameterException("IV must be " + ivLength + " bytes long.");
}
if (key instanceof RepeatedSecretKeySpec)
{
param = new ParametersWithIV(null, p.getIV());
ivParam = (ParametersWithIV)param;
}
else
{
param = new ParametersWithIV(new KeyParameter(key.getEncoded()), p.getIV());
ivParam = (ParametersWithIV)param;
}
}
else
{
if (modeName != null && modeName.equals("ECB"))
{
throw new InvalidAlgorithmParameterException("ECB mode does not use an IV");
}
param = new KeyParameter(key.getEncoded());
}
}
else if (params instanceof GOST28147ParameterSpec)
{
GOST28147ParameterSpec gost28147Param = (GOST28147ParameterSpec)params;
param = new ParametersWithSBox(
new KeyParameter(key.getEncoded()), ((GOST28147ParameterSpec)params).getSbox());
if (gost28147Param.getIV() != null && ivLength != 0)
{
param = new ParametersWithIV(param, gost28147Param.getIV());
ivParam = (ParametersWithIV)param;
}
}
else if (params instanceof RC2ParameterSpec)
{
RC2ParameterSpec rc2Param = (RC2ParameterSpec)params;
param = new RC2Parameters(key.getEncoded(), ((RC2ParameterSpec)params).getEffectiveKeyBits());
if (rc2Param.getIV() != null && ivLength != 0)
{
param = new ParametersWithIV(param, rc2Param.getIV());
ivParam = (ParametersWithIV)param;
}
}
else if (params instanceof RC5ParameterSpec)
{
RC5ParameterSpec rc5Param = (RC5ParameterSpec)params;
param = new RC5Parameters(key.getEncoded(), ((RC5ParameterSpec)params).getRounds());
if (baseEngine.getAlgorithmName().startsWith("RC5"))
{
if (baseEngine.getAlgorithmName().equals("RC5-32"))
{
if (rc5Param.getWordSize() != 32)
{
throw new InvalidAlgorithmParameterException("RC5 already set up for a word size of 32 not " + rc5Param.getWordSize() + ".");
}
}
else if (baseEngine.getAlgorithmName().equals("RC5-64"))
{
if (rc5Param.getWordSize() != 64)
{
throw new InvalidAlgorithmParameterException("RC5 already set up for a word size of 64 not " + rc5Param.getWordSize() + ".");
}
}
}
else
{
throw new InvalidAlgorithmParameterException("RC5 parameters passed to a cipher that is not RC5.");
}
if ((rc5Param.getIV() != null) && (ivLength != 0))
{
param = new ParametersWithIV(param, rc5Param.getIV());
ivParam = (ParametersWithIV)param;
}
}
else
{
throw new InvalidAlgorithmParameterException("unknown parameter type.");
}
if ((ivLength != 0) && !(param instanceof ParametersWithIV))
{
SecureRandom ivRandom = random;
if (ivRandom == null)
{
ivRandom = new SecureRandom();
}
if ((opmode == Cipher.ENCRYPT_MODE) || (opmode == Cipher.WRAP_MODE))
{
byte[] iv = new byte[ivLength];
ivRandom.nextBytes(iv);
param = new ParametersWithIV(param, iv);
ivParam = (ParametersWithIV)param;
}
else if (cipher.getUnderlyingCipher().getAlgorithmName().indexOf("PGPCFB") < 0)
{
throw new InvalidAlgorithmParameterException("no IV set when one expected");
}
}
if (random != null && padded)
{
param = new ParametersWithRandom(param, random);
}
try
{
switch (opmode)
{
case Cipher.ENCRYPT_MODE:
case Cipher.WRAP_MODE:
cipher.init(true, param);
break;
case Cipher.DECRYPT_MODE:
case Cipher.UNWRAP_MODE:
cipher.init(false, param);
break;
default:
throw new InvalidParameterException("unknown opmode " + opmode + " passed");
}
}
catch (Exception e)
{
throw new InvalidKeyException(e.getMessage());
}
}