package org.bouncycastle.openssl.bc;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.PBEParametersGenerator;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.engines.AESEngine;
import org.bouncycastle.crypto.engines.BlowfishEngine;
import org.bouncycastle.crypto.engines.DESEngine;
import org.bouncycastle.crypto.engines.DESedeEngine;
import org.bouncycastle.crypto.engines.RC2Engine;
import org.bouncycastle.crypto.generators.OpenSSLPBEParametersGenerator;
import org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.modes.CFBBlockCipher;
import org.bouncycastle.crypto.modes.OFBBlockCipher;
import org.bouncycastle.crypto.paddings.BlockCipherPadding;
import org.bouncycastle.crypto.paddings.PKCS7Padding;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.crypto.params.RC2Parameters;
import org.bouncycastle.openssl.EncryptionException;
import org.bouncycastle.openssl.PEMException;
import org.bouncycastle.util.Integers;
class PEMUtilities
{
private static final Map KEYSIZES = new HashMap();
private static final Set PKCS5_SCHEME_1 = new HashSet();
private static final Set PKCS5_SCHEME_2 = new HashSet();
static
{
PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithMD2AndDES_CBC);
PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithMD2AndRC2_CBC);
PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithMD5AndDES_CBC);
PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithMD5AndRC2_CBC);
PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithSHA1AndDES_CBC);
PKCS5_SCHEME_1.add(PKCSObjectIdentifiers.pbeWithSHA1AndRC2_CBC);
PKCS5_SCHEME_2.add(PKCSObjectIdentifiers.id_PBES2);
PKCS5_SCHEME_2.add(PKCSObjectIdentifiers.des_EDE3_CBC);
PKCS5_SCHEME_2.add(NISTObjectIdentifiers.id_aes128_CBC);
PKCS5_SCHEME_2.add(NISTObjectIdentifiers.id_aes192_CBC);
PKCS5_SCHEME_2.add(NISTObjectIdentifiers.id_aes256_CBC);
KEYSIZES.put(PKCSObjectIdentifiers.des_EDE3_CBC.getId(), Integers.valueOf(192));
KEYSIZES.put(NISTObjectIdentifiers.id_aes128_CBC.getId(), Integers.valueOf(128));
KEYSIZES.put(NISTObjectIdentifiers.id_aes192_CBC.getId(), Integers.valueOf(192));
KEYSIZES.put(NISTObjectIdentifiers.id_aes256_CBC.getId(), Integers.valueOf(256));
KEYSIZES.put(PKCSObjectIdentifiers.pbeWithSHAAnd128BitRC4.getId(), Integers.valueOf(128));
KEYSIZES.put(PKCSObjectIdentifiers.pbeWithSHAAnd40BitRC4, Integers.valueOf(40));
KEYSIZES.put(PKCSObjectIdentifiers.pbeWithSHAAnd2_KeyTripleDES_CBC, Integers.valueOf(128));
KEYSIZES.put(PKCSObjectIdentifiers.pbeWithSHAAnd3_KeyTripleDES_CBC, Integers.valueOf(192));
KEYSIZES.put(PKCSObjectIdentifiers.pbeWithSHAAnd128BitRC2_CBC, Integers.valueOf(128));
KEYSIZES.put(PKCSObjectIdentifiers.pbeWithSHAAnd40BitRC2_CBC, Integers.valueOf(40));
}
static int getKeySize(String algorithm)
{
if (!KEYSIZES.containsKey(algorithm))
{
throw new IllegalStateException("no key size for algorithm: " + algorithm);
}
return ((Integer)KEYSIZES.get(algorithm)).intValue();
}
static boolean isPKCS5Scheme1(ASN1ObjectIdentifier algOid)
{
return PKCS5_SCHEME_1.contains(algOid);
}
static boolean isPKCS5Scheme2(ASN1ObjectIdentifier algOid)
{
return PKCS5_SCHEME_2.contains(algOid);
}
public static boolean isPKCS12(ASN1ObjectIdentifier algOid)
{
return algOid.getId().startsWith(PKCSObjectIdentifiers.pkcs_12PbeIds.getId());
}
public static KeyParameter generateSecretKeyForPKCS5Scheme2(String algorithm, char[] password, byte[] salt, int iterationCount)
{
PBEParametersGenerator paramsGen = new PKCS5S2ParametersGenerator(new SHA1Digest());
paramsGen.init(PBEParametersGenerator.PKCS5PasswordToBytes(password), salt, iterationCount);
return (KeyParameter)paramsGen.generateDerivedParameters(PEMUtilities.getKeySize(algorithm));
}
static byte[] crypt(
boolean encrypt,
byte[] bytes,
char[] password,
String dekAlgName,
byte[] iv)
throws PEMException
{
byte[] ivValue = iv;
String blockMode = "CBC";
BlockCipher engine;
BlockCipherPadding padding = new PKCS7Padding();
KeyParameter sKey;
// Figure out block mode and padding.
if (dekAlgName.endsWith("-CFB"))
{
blockMode = "CFB";
padding = null;
}
if (dekAlgName.endsWith("-ECB") ||
"DES-EDE".equals(dekAlgName) ||
"DES-EDE3".equals(dekAlgName))
{
// ECB is actually the default (though seldom used) when OpenSSL
// uses DES-EDE (des2) or DES-EDE3 (des3).
blockMode = "ECB";
ivValue = null;
}
if (dekAlgName.endsWith("-OFB"))
{
blockMode = "OFB";
padding = null;
}
// Figure out algorithm and key size.
if (dekAlgName.startsWith("DES-EDE"))
{
// "DES-EDE" is actually des2 in OpenSSL-speak!
// "DES-EDE3" is des3.
boolean des2 = !dekAlgName.startsWith("DES-EDE3");
sKey = getKey(password, 24, iv, des2);
engine = new DESedeEngine();
}
else if (dekAlgName.startsWith("DES-"))
{
sKey = getKey(password, 8, iv);
engine = new DESEngine();
}
else if (dekAlgName.startsWith("BF-"))
{
sKey = getKey(password, 16, iv);
engine = new BlowfishEngine();
}
else if (dekAlgName.startsWith("RC2-"))
{
int keyBits = 128;
if (dekAlgName.startsWith("RC2-40-"))
{
keyBits = 40;
}
else if (dekAlgName.startsWith("RC2-64-"))
{
keyBits = 64;
}
sKey = new RC2Parameters(getKey(password, keyBits / 8, iv).getKey(), keyBits);;
engine = new RC2Engine();
}
else if (dekAlgName.startsWith("AES-"))
{
byte[] salt = iv;
if (salt.length > 8)
{
salt = new byte[8];
System.arraycopy(iv, 0, salt, 0, 8);
}
int keyBits;
if (dekAlgName.startsWith("AES-128-"))
{
keyBits = 128;
}
else if (dekAlgName.startsWith("AES-192-"))
{
keyBits = 192;
}
else if (dekAlgName.startsWith("AES-256-"))
{
keyBits = 256;
}
else
{
throw new EncryptionException("unknown AES encryption with private key: " + dekAlgName);
}
sKey = getKey(password, keyBits / 8, salt);
engine = new AESEngine();
}
else
{
throw new EncryptionException("unknown encryption with private key: " + dekAlgName);
}
if (blockMode.equals("CBC"))
{
engine = new CBCBlockCipher(engine);
}
else if (blockMode.equals("CFB"))
{
engine = new CFBBlockCipher(engine, engine.getBlockSize() * 8);
}
else if (blockMode.equals("OFB"))
{
engine = new OFBBlockCipher(engine, engine.getBlockSize() * 8);
}
try
{
BufferedBlockCipher c;
if (padding == null)
{
c = new BufferedBlockCipher(engine);
}
else
{
c = new PaddedBufferedBlockCipher(engine, padding);
}
if (ivValue == null) // ECB block mode
{
c.init(encrypt, sKey);
}
else
{
c.init(encrypt, new ParametersWithIV(sKey, ivValue));
}
byte[] out = new byte[c.getOutputSize(bytes.length)];
int procLen = c.processBytes(bytes, 0, bytes.length, out, 0);
procLen += c.doFinal(out, procLen);
if (procLen == out.length)
{
return out;
}
else
{
byte[] rv = new byte[procLen];
System.arraycopy(out, 0, rv, 0, procLen);
return rv;
}
}
catch (Exception e)
{
throw new EncryptionException("exception using cipher - please check password and data.", e);
}
}
private static KeyParameter getKey(
char[] password,
int keyLength,
byte[] salt)
throws PEMException
{
return getKey(password, keyLength, salt, false);
}
private static KeyParameter getKey(
char[] password,
int keyLength,
byte[] salt,
boolean des2)
throws PEMException
{
PBEParametersGenerator paramsGen = new OpenSSLPBEParametersGenerator();
paramsGen.init(PBEParametersGenerator.PKCS5PasswordToBytes(password), salt, 1);
KeyParameter kp = (KeyParameter)paramsGen.generateDerivedParameters(keyLength * 8);
if (des2 && kp.getKey().length == 24)
{
// For DES2, we must copy first 8 bytes into the last 8 bytes.
byte[] key = kp.getKey();
System.arraycopy(key, 0, key, 16, 8);
return new KeyParameter(key);
}
return kp;
}
}