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using System;
using System.Text;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Crypto
{
/**
* super class for all Password Based Encyrption (Pbe) parameter generator classes.
*/
public abstract class PbeParametersGenerator
{
protected byte[] mPassword;
protected byte[] mSalt;
protected int mIterationCount;
/**
* base constructor.
*/
protected PbeParametersGenerator()
{
}
/**
* initialise the Pbe generator.
*
* @param password the password converted into bytes (see below).
* @param salt the salt to be mixed with the password.
* @param iterationCount the number of iterations the "mixing" function
* is to be applied for.
*/
public virtual void Init(
byte[] password,
byte[] salt,
int iterationCount)
{
if (password == null)
throw new ArgumentNullException("password");
if (salt == null)
throw new ArgumentNullException("salt");
this.mPassword = Arrays.Clone(password);
this.mSalt = Arrays.Clone(salt);
this.mIterationCount = iterationCount;
}
public virtual byte[] Password
{
get { return Arrays.Clone(mPassword); }
}
/**
* return the password byte array.
*
* @return the password byte array.
*/
[Obsolete("Use 'Password' property")]
public byte[] GetPassword()
{
return Password;
}
public virtual byte[] Salt
{
get { return Arrays.Clone(mSalt); }
}
/**
* return the salt byte array.
*
* @return the salt byte array.
*/
[Obsolete("Use 'Salt' property")]
public byte[] GetSalt()
{
return Salt;
}
/**
* return the iteration count.
*
* @return the iteration count.
*/
public virtual int IterationCount
{
get { return mIterationCount; }
}
/**
* Generate derived parameters for a key of length keySize.
*
* @param keySize the length, in bits, of the key required.
* @return a parameters object representing a key.
*/
[Obsolete("Use version with 'algorithm' parameter")]
public abstract ICipherParameters GenerateDerivedParameters(int keySize);
public abstract ICipherParameters GenerateDerivedParameters(string algorithm, int keySize);
/**
* Generate derived parameters for a key of length keySize, and
* an initialisation vector (IV) of length ivSize.
*
* @param keySize the length, in bits, of the key required.
* @param ivSize the length, in bits, of the iv required.
* @return a parameters object representing a key and an IV.
*/
[Obsolete("Use version with 'algorithm' parameter")]
public abstract ICipherParameters GenerateDerivedParameters(int keySize, int ivSize);
public abstract ICipherParameters GenerateDerivedParameters(string algorithm, int keySize, int ivSize);
/**
* Generate derived parameters for a key of length keySize, specifically
* for use with a MAC.
*
* @param keySize the length, in bits, of the key required.
* @return a parameters object representing a key.
*/
public abstract ICipherParameters GenerateDerivedMacParameters(int keySize);
/**
* converts a password to a byte array according to the scheme in
* Pkcs5 (ascii, no padding)
*
* @param password a character array representing the password.
* @return a byte array representing the password.
*/
public static byte[] Pkcs5PasswordToBytes(
char[] password)
{
return Strings.ToAsciiByteArray(password);
}
[Obsolete("Use version taking 'char[]' instead")]
public static byte[] Pkcs5PasswordToBytes(
string password)
{
return Strings.ToAsciiByteArray(password);
}
/**
* converts a password to a byte array according to the scheme in
* PKCS5 (UTF-8, no padding)
*
* @param password a character array representing the password.
* @return a byte array representing the password.
*/
public static byte[] Pkcs5PasswordToUtf8Bytes(
char[] password)
{
return Encoding.UTF8.GetBytes(password);
}
[Obsolete("Use version taking 'char[]' instead")]
public static byte[] Pkcs5PasswordToUtf8Bytes(
string password)
{
return Encoding.UTF8.GetBytes(password);
}
/**
* converts a password to a byte array according to the scheme in
* Pkcs12 (unicode, big endian, 2 zero pad bytes at the end).
*
* @param password a character array representing the password.
* @return a byte array representing the password.
*/
public static byte[] Pkcs12PasswordToBytes(
char[] password)
{
return Pkcs12PasswordToBytes(password, false);
}
public static byte[] Pkcs12PasswordToBytes(
char[] password,
bool wrongPkcs12Zero)
{
if (password.Length < 1)
{
return new byte[wrongPkcs12Zero ? 2 : 0];
}
// +1 for extra 2 pad bytes.
byte[] bytes = new byte[(password.Length + 1) * 2];
Encoding.BigEndianUnicode.GetBytes(password, 0, password.Length, bytes, 0);
return bytes;
}
}
}
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