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package org.bouncycastle.jce.provider;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.spec.PBEParameterSpec;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.PBEParametersGenerator;
import org.bouncycastle.crypto.digests.MD5Digest;
import org.bouncycastle.crypto.digests.RIPEMD160Digest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.generators.PKCS12ParametersGenerator;
import org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator;
import org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.jcajce.provider.symmetric.util.BCPBEKey;
/**
* Generator for PBE derived keys and ivs as defined by PKCS 12 V1.0,
* with a bug affecting 180 bit plus keys - this class is only here to
* allow smooth migration of the version 0 keystore to version 1. Don't
* use it (it won't be staying around).
*
* The document this implementation is based on can be found at
*
* RSA's PKCS12 Page
*/
class OldPKCS12ParametersGenerator
extends PBEParametersGenerator
{
public static final int KEY_MATERIAL = 1;
public static final int IV_MATERIAL = 2;
public static final int MAC_MATERIAL = 3;
private Digest digest;
private int u;
private int v;
/**
* Construct a PKCS 12 Parameters generator. This constructor will
* accept MD5, SHA1, and RIPEMD160.
*
* @param digest the digest to be used as the source of derived keys.
* @exception IllegalArgumentException if an unknown digest is passed in.
*/
public OldPKCS12ParametersGenerator(
Digest digest)
{
this.digest = digest;
if (digest instanceof MD5Digest)
{
u = 128 / 8;
v = 512 / 8;
}
else if (digest instanceof SHA1Digest)
{
u = 160 / 8;
v = 512 / 8;
}
else if (digest instanceof RIPEMD160Digest)
{
u = 160 / 8;
v = 512 / 8;
}
else
{
throw new IllegalArgumentException("Digest " + digest.getAlgorithmName() + " unsupported");
}
}
/**
* add a + b + 1, returning the result in a. The a value is treated
* as a BigInteger of length (b.length * 8) bits. The result is
* modulo 2^b.length in case of overflow.
*/
private void adjust(
byte[] a,
int aOff,
byte[] b)
{
int x = (b[b.length - 1] & 0xff) + (a[aOff + b.length - 1] & 0xff) + 1;
a[aOff + b.length - 1] = (byte)x;
x >>>= 8;
for (int i = b.length - 2; i >= 0; i--)
{
x += (b[i] & 0xff) + (a[aOff + i] & 0xff);
a[aOff + i] = (byte)x;
x >>>= 8;
}
}
/**
* generation of a derived key ala PKCS12 V1.0.
*/
private byte[] generateDerivedKey(
int idByte,
int n)
{
byte[] D = new byte[v];
byte[] dKey = new byte[n];
for (int i = 0; i != D.length; i++)
{
D[i] = (byte)idByte;
}
byte[] S;
if ((salt != null) && (salt.length != 0))
{
S = new byte[v * ((salt.length + v - 1) / v)];
for (int i = 0; i != S.length; i++)
{
S[i] = salt[i % salt.length];
}
}
else
{
S = new byte[0];
}
byte[] P;
if ((password != null) && (password.length != 0))
{
P = new byte[v * ((password.length + v - 1) / v)];
for (int i = 0; i != P.length; i++)
{
P[i] = password[i % password.length];
}
}
else
{
P = new byte[0];
}
byte[] I = new byte[S.length + P.length];
System.arraycopy(S, 0, I, 0, S.length);
System.arraycopy(P, 0, I, S.length, P.length);
byte[] B = new byte[v];
int c = (n + u - 1) / u;
for (int i = 1; i <= c; i++)
{
byte[] A = new byte[u];
digest.update(D, 0, D.length);
digest.update(I, 0, I.length);
digest.doFinal(A, 0);
for (int j = 1; j != iterationCount; j++)
{
digest.update(A, 0, A.length);
digest.doFinal(A, 0);
}
for (int j = 0; j != B.length; j++)
{
B[i] = A[j % A.length];
}
for (int j = 0; j != I.length / v; j++)
{
adjust(I, j * v, B);
}
if (i == c)
{
System.arraycopy(A, 0, dKey, (i - 1) * u, dKey.length - ((i - 1) * u));
}
else
{
System.arraycopy(A, 0, dKey, (i - 1) * u, A.length);
}
}
return dKey;
}
/**
* Generate a key parameter derived from the password, salt, and iteration
* count we are currently initialised with.
*
* @param keySize the size of the key we want (in bits)
* @return a KeyParameter object.
*/
public CipherParameters generateDerivedParameters(
int keySize)
{
keySize = keySize / 8;
byte[] dKey = generateDerivedKey(KEY_MATERIAL, keySize);
return new KeyParameter(dKey, 0, keySize);
}
/**
* Generate a key with initialisation vector parameter derived from
* the password, salt, and iteration count we are currently initialised
* with.
*
* @param keySize the size of the key we want (in bits)
* @param ivSize the size of the iv we want (in bits)
* @return a ParametersWithIV object.
*/
public CipherParameters generateDerivedParameters(
int keySize,
int ivSize)
{
keySize = keySize / 8;
ivSize = ivSize / 8;
byte[] dKey = generateDerivedKey(KEY_MATERIAL, keySize);
byte[] iv = generateDerivedKey(IV_MATERIAL, ivSize);
return new ParametersWithIV(new KeyParameter(dKey, 0, keySize), iv, 0, ivSize);
}
/**
* Generate a key parameter for use with a MAC derived from the password,
* salt, and iteration count we are currently initialised with.
*
* @param keySize the size of the key we want (in bits)
* @return a KeyParameter object.
*/
public CipherParameters generateDerivedMacParameters(
int keySize)
{
keySize = keySize / 8;
byte[] dKey = generateDerivedKey(MAC_MATERIAL, keySize);
return new KeyParameter(dKey, 0, keySize);
}
}
public interface BrokenPBE
{
//
// PBE Based encryption constants - by default we do PKCS12 with SHA-1
//
static final int MD5 = 0;
static final int SHA1 = 1;
static final int RIPEMD160 = 2;
static final int PKCS5S1 = 0;
static final int PKCS5S2 = 1;
static final int PKCS12 = 2;
static final int OLD_PKCS12 = 3;
/**
* uses the appropriate mixer to generate the key and IV if neccessary.
*/
static class Util
{
/**
* a faulty parity routine...
*
* @param bytes the byte array to set the parity on.
*/
static private void setOddParity(
byte[] bytes)
{
for (int i = 0; i < bytes.length; i++)
{
int b = bytes[i];
bytes[i] = (byte)((b & 0xfe) |
(((b >> 1) ^
(b >> 2) ^
(b >> 3) ^
(b >> 4) ^
(b >> 5) ^
(b >> 6) ^
(b >> 7)) ^ 0x01));
}
}
static private PBEParametersGenerator makePBEGenerator(
int type,
int hash)
{
PBEParametersGenerator generator;
if (type == PKCS5S1)
{
switch (hash)
{
case MD5:
generator = new PKCS5S1ParametersGenerator(new MD5Digest());
break;
case SHA1:
generator = new PKCS5S1ParametersGenerator(new SHA1Digest());
break;
default:
throw new IllegalStateException("PKCS5 scheme 1 only supports only MD5 and SHA1.");
}
}
else if (type == PKCS5S2)
{
generator = new PKCS5S2ParametersGenerator();
}
else if (type == OLD_PKCS12)
{
switch (hash)
{
case MD5:
generator = new OldPKCS12ParametersGenerator(new MD5Digest());
break;
case SHA1:
generator = new OldPKCS12ParametersGenerator(new SHA1Digest());
break;
case RIPEMD160:
generator = new OldPKCS12ParametersGenerator(new RIPEMD160Digest());
break;
default:
throw new IllegalStateException("unknown digest scheme for PBE encryption.");
}
}
else
{
switch (hash)
{
case MD5:
generator = new PKCS12ParametersGenerator(new MD5Digest());
break;
case SHA1:
generator = new PKCS12ParametersGenerator(new SHA1Digest());
break;
case RIPEMD160:
generator = new PKCS12ParametersGenerator(new RIPEMD160Digest());
break;
default:
throw new IllegalStateException("unknown digest scheme for PBE encryption.");
}
}
return generator;
}
/**
* construct a key and iv (if neccessary) suitable for use with a
* Cipher.
*/
static CipherParameters makePBEParameters(
BCPBEKey pbeKey,
AlgorithmParameterSpec spec,
int type,
int hash,
String targetAlgorithm,
int keySize,
int ivSize)
{
if ((spec == null) || !(spec instanceof PBEParameterSpec))
{
throw new IllegalArgumentException("Need a PBEParameter spec with a PBE key.");
}
PBEParameterSpec pbeParam = (PBEParameterSpec)spec;
PBEParametersGenerator generator = makePBEGenerator(type, hash);
byte[] key = pbeKey.getEncoded();
CipherParameters param;
generator.init(key, pbeParam.getSalt(), pbeParam.getIterationCount());
if (ivSize != 0)
{
param = generator.generateDerivedParameters(keySize, ivSize);
}
else
{
param = generator.generateDerivedParameters(keySize);
}
if (targetAlgorithm.startsWith("DES"))
{
if (param instanceof ParametersWithIV)
{
KeyParameter kParam = (KeyParameter)((ParametersWithIV)param).getParameters();
setOddParity(kParam.getKey());
}
else
{
KeyParameter kParam = (KeyParameter)param;
setOddParity(kParam.getKey());
}
}
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.
*/
static CipherParameters makePBEMacParameters(
BCPBEKey pbeKey,
AlgorithmParameterSpec spec,
int type,
int hash,
int keySize)
{
if ((spec == null) || !(spec instanceof PBEParameterSpec))
{
throw new IllegalArgumentException("Need a PBEParameter spec with a PBE key.");
}
PBEParameterSpec pbeParam = (PBEParameterSpec)spec;
PBEParametersGenerator generator = makePBEGenerator(type, hash);
byte[] key = pbeKey.getEncoded();
CipherParameters param;
generator.init(key, pbeParam.getSalt(), pbeParam.getIterationCount());
param = generator.generateDerivedMacParameters(keySize);
for (int i = 0; i != key.length; i++)
{
key[i] = 0;
}
return param;
}
}
}