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package org.spongycastle.openpgp.operator.bc;
import org.spongycastle.crypto.BufferedBlockCipher;
import org.spongycastle.crypto.InvalidCipherTextException;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.spongycastle.openpgp.operator.PGPDigestCalculatorProvider;
public class BcPBESecretKeyDecryptorBuilder
{
private PGPDigestCalculatorProvider calculatorProvider;
public BcPBESecretKeyDecryptorBuilder(PGPDigestCalculatorProvider calculatorProvider)
{
this.calculatorProvider = calculatorProvider;
}
public PBESecretKeyDecryptor build(char[] passPhrase)
{
return new PBESecretKeyDecryptor(passPhrase, calculatorProvider)
{
public byte[] recoverKeyData(int encAlgorithm, byte[] key, byte[] iv, byte[] keyData, int keyOff, int keyLen)
throws PGPException
{
try
{
BufferedBlockCipher c = BcUtil.createSymmetricKeyWrapper(false, BcImplProvider.createBlockCipher(encAlgorithm), key, iv);
byte[] out = new byte[keyLen];
int outLen = c.processBytes(keyData, keyOff, keyLen, out, 0);
outLen += c.doFinal(out, outLen);
return out;
}
catch (InvalidCipherTextException e)
{
throw new PGPException("decryption failed: " + e.getMessage(), e);
}
}
};
}
}
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