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package org.spongycastle.openpgp.operator;
import java.security.SecureRandom;
import org.spongycastle.bcpg.S2K;
import org.spongycastle.openpgp.PGPException;
public abstract class PBESecretKeyEncryptor
{
protected int encAlgorithm;
protected char[] passPhrase;
protected PGPDigestCalculator s2kDigestCalculator;
protected int s2kCount;
protected S2K s2k;
protected SecureRandom random;
protected PBESecretKeyEncryptor(int encAlgorithm, PGPDigestCalculator s2kDigestCalculator, SecureRandom random, char[] passPhrase)
{
this(encAlgorithm, s2kDigestCalculator, 0x60, random, passPhrase);
}
protected PBESecretKeyEncryptor(int encAlgorithm, PGPDigestCalculator s2kDigestCalculator, int s2kCount, SecureRandom random, char[] passPhrase)
{
this.encAlgorithm = encAlgorithm;
this.passPhrase = passPhrase;
this.random = random;
this.s2kDigestCalculator = s2kDigestCalculator;
if (s2kCount < 0 || s2kCount > 0xff)
{
throw new IllegalArgumentException("s2kCount value outside of range 0 to 255.");
}
this.s2kCount = s2kCount;
}
public int getAlgorithm()
{
return encAlgorithm;
}
public int getHashAlgorithm()
{
if (s2kDigestCalculator != null)
{
return s2kDigestCalculator.getAlgorithm();
}
return -1;
}
public byte[] getKey()
throws PGPException
{
return PGPUtil.makeKeyFromPassPhrase(s2kDigestCalculator, encAlgorithm, s2k, passPhrase);
}
public S2K getS2K()
{
return s2k;
}
/**
* Key encryption method invoked for V4 keys and greater.
*
* @param keyData raw key data
* @param keyOff offset into rawe key data
* @param keyLen length of key data to use.
* @return an encryption of the passed in keyData.
* @throws PGPException on error in the underlying encryption process.
*/
public byte[] encryptKeyData(byte[] keyData, int keyOff, int keyLen)
throws PGPException
{
if (s2k == null)
{
byte[] iv = new byte[8];
random.nextBytes(iv);
s2k = new S2K(s2kDigestCalculator.getAlgorithm(), iv, s2kCount);
}
return encryptKeyData(getKey(), keyData, keyOff, keyLen);
}
public abstract byte[] encryptKeyData(byte[] key, byte[] keyData, int keyOff, int keyLen)
throws PGPException;
/**
* Encrypt the passed in keyData using the key and the iv provided.
* <p>
* This method is only used for processing version 3 keys.
* </p>
*/
public byte[] encryptKeyData(byte[] key, byte[] iv, byte[] keyData, int keyOff, int keyLen)
throws PGPException
{
throw new PGPException("encryption of version 3 keys not supported.");
}
public abstract byte[] getCipherIV();
}
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