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package org.bouncycastle.crypto.params;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Locale;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.digests.SkeinDigest;
import org.bouncycastle.crypto.digests.SkeinEngine;
import org.bouncycastle.crypto.macs.SkeinMac;
import org.bouncycastle.util.Integers;
/**
* Parameters for the Skein hash function - a series of byte[] strings identified by integer tags.
*
* Parameterised Skein can be used for:
*
* - MAC generation, by providing a {@link SkeinParameters.Builder#setKey(byte[]) key}.
* - Randomised hashing, by providing a {@link SkeinParameters.Builder#setNonce(byte[]) nonce}.
* - A hash function for digital signatures, associating a
* {@link SkeinParameters.Builder#setPublicKey(byte[]) public key} with the message digest.
* - A key derivation function, by providing a
* {@link SkeinParameters.Builder#setKeyIdentifier(byte[]) key identifier}.
* - Personalised hashing, by providing a
* {@link SkeinParameters.Builder#setPersonalisation(Date, String, String) recommended format} or
* {@link SkeinParameters.Builder#setPersonalisation(byte[]) arbitrary} personalisation string.
*
*
* @see SkeinEngine
* @see SkeinDigest
* @see SkeinMac
*/
public class SkeinParameters
implements CipherParameters
{
/**
* The parameter type for a secret key, supporting MAC or KDF functions: {@value
* #PARAM_TYPE_KEY}.
*/
public static final int PARAM_TYPE_KEY = 0;
/**
* The parameter type for the Skein configuration block: {@value #PARAM_TYPE_CONFIG}.
*/
public static final int PARAM_TYPE_CONFIG = 4;
/**
* The parameter type for a personalisation string: {@value #PARAM_TYPE_PERSONALISATION}.
*/
public static final int PARAM_TYPE_PERSONALISATION = 8;
/**
* The parameter type for a public key: {@value #PARAM_TYPE_PUBLIC_KEY}.
*/
public static final int PARAM_TYPE_PUBLIC_KEY = 12;
/**
* The parameter type for a key identifier string: {@value #PARAM_TYPE_KEY_IDENTIFIER}.
*/
public static final int PARAM_TYPE_KEY_IDENTIFIER = 16;
/**
* The parameter type for a nonce: {@value #PARAM_TYPE_NONCE}.
*/
public static final int PARAM_TYPE_NONCE = 20;
/**
* The parameter type for the message: {@value #PARAM_TYPE_MESSAGE}.
*/
public static final int PARAM_TYPE_MESSAGE = 48;
/**
* The parameter type for the output transformation: {@value #PARAM_TYPE_OUTPUT}.
*/
public static final int PARAM_TYPE_OUTPUT = 63;
private Hashtable parameters;
public SkeinParameters()
{
this(new Hashtable());
}
private SkeinParameters(final Hashtable parameters)
{
this.parameters = parameters;
}
/**
* Obtains a map of type (Integer) to value (byte[]) for the parameters tracked in this object.
*/
public Hashtable getParameters()
{
return parameters;
}
/**
* Obtains the value of the {@link #PARAM_TYPE_KEY key parameter}, or null if not
* set.
*/
public byte[] getKey()
{
return (byte[])parameters.get(Integers.valueOf(PARAM_TYPE_KEY));
}
/**
* Obtains the value of the {@link #PARAM_TYPE_PERSONALISATION personalisation parameter}, or
* null if not set.
*/
public byte[] getPersonalisation()
{
return (byte[])parameters.get(Integers.valueOf(PARAM_TYPE_PERSONALISATION));
}
/**
* Obtains the value of the {@link #PARAM_TYPE_PUBLIC_KEY public key parameter}, or
* null if not set.
*/
public byte[] getPublicKey()
{
return (byte[])parameters.get(Integers.valueOf(PARAM_TYPE_PUBLIC_KEY));
}
/**
* Obtains the value of the {@link #PARAM_TYPE_KEY_IDENTIFIER key identifier parameter}, or
* null if not set.
*/
public byte[] getKeyIdentifier()
{
return (byte[])parameters.get(Integers.valueOf(PARAM_TYPE_KEY_IDENTIFIER));
}
/**
* Obtains the value of the {@link #PARAM_TYPE_NONCE nonce parameter}, or null if
* not set.
*/
public byte[] getNonce()
{
return (byte[])parameters.get(Integers.valueOf(PARAM_TYPE_NONCE));
}
/**
* A builder for {@link SkeinParameters}.
*/
public static class Builder
{
private Hashtable parameters = new Hashtable();
public Builder()
{
}
public Builder(Hashtable paramsMap)
{
Enumeration keys = paramsMap.keys();
while (keys.hasMoreElements())
{
Integer key = (Integer)keys.nextElement();
parameters.put(key, paramsMap.get(key));
}
}
public Builder(SkeinParameters params)
{
Enumeration keys = params.parameters.keys();
while (keys.hasMoreElements())
{
Integer key = (Integer)keys.nextElement();
parameters.put(key, params.parameters.get(key));
}
}
/**
* Sets a parameters to apply to the Skein hash function.
* Parameter types must be in the range 0,5..62, and cannot use the value {@link
* #PARAM_TYPE_MESSAGE} (reserved for message body).
*
* Parameters with type < {@link #PARAM_TYPE_MESSAGE} are processed before
* the message content, parameters with type > {@link #PARAM_TYPE_MESSAGE}
* are processed after the message and prior to output.
*
* @param type the type of the parameter, in the range 5..62.
* @param value the byte sequence of the parameter.
* @return the current builder instance.
*/
public Builder set(int type, byte[] value)
{
if (value == null)
{
throw new IllegalArgumentException("Parameter value must not be null.");
}
if ((type != PARAM_TYPE_KEY)
&& (type <= PARAM_TYPE_CONFIG || type >= PARAM_TYPE_OUTPUT || type == PARAM_TYPE_MESSAGE))
{
throw new IllegalArgumentException("Parameter types must be in the range 0,5..47,49..62.");
}
if (type == PARAM_TYPE_CONFIG)
{
throw new IllegalArgumentException("Parameter type " + PARAM_TYPE_CONFIG
+ " is reserved for internal use.");
}
this.parameters.put(Integers.valueOf(type), value);
return this;
}
/**
* Sets the {@link #PARAM_TYPE_KEY} parameter.
*/
public Builder setKey(byte[] key)
{
return set(PARAM_TYPE_KEY, key);
}
/**
* Sets the {@link #PARAM_TYPE_PERSONALISATION} parameter.
*/
public Builder setPersonalisation(byte[] personalisation)
{
return set(PARAM_TYPE_PERSONALISATION, personalisation);
}
/**
* Implements the recommended personalisation format for Skein defined in Section 4.11 of
* the Skein 1.3 specification.
*
* The format is YYYYMMDD email@address distinguisher, encoded to a byte
* sequence using UTF-8 encoding.
*
* @param date the date the personalised application of the Skein was defined.
* @param emailAddress the email address of the creation of the personalised application.
* @param distinguisher an arbitrary personalisation string distinguishing the application.
* @return the current builder.
*/
public Builder setPersonalisation(Date date, String emailAddress, String distinguisher)
{
try
{
final ByteArrayOutputStream bout = new ByteArrayOutputStream();
final OutputStreamWriter out = new OutputStreamWriter(bout, "UTF-8");
final DateFormat format = new SimpleDateFormat("YYYYMMDD");
out.write(format.format(date));
out.write(" ");
out.write(emailAddress);
out.write(" ");
out.write(distinguisher);
out.close();
return set(PARAM_TYPE_PERSONALISATION, bout.toByteArray());
}
catch (IOException e)
{
throw new IllegalStateException("Byte I/O failed: " + e);
}
}
/**
* Implements the recommended personalisation format for Skein defined in Section 4.11 of
* the Skein 1.3 specification. You may need to use this method if the default locale
* doesn't use a Gregorian calender so that the GeneralizedTime produced is compatible implementations.
*
* The format is YYYYMMDD email@address distinguisher, encoded to a byte
* sequence using UTF-8 encoding.
*
* @param date the date the personalised application of the Skein was defined.
* @param dateLocale locale to be used for date interpretation.
* @param emailAddress the email address of the creation of the personalised application.
* @param distinguisher an arbitrary personalisation string distinguishing the application.
* @return the current builder.
*/
public Builder setPersonalisation(Date date, Locale dateLocale, String emailAddress, String distinguisher)
{
try
{
final ByteArrayOutputStream bout = new ByteArrayOutputStream();
final OutputStreamWriter out = new OutputStreamWriter(bout, "UTF-8");
final DateFormat format = new SimpleDateFormat("YYYYMMDD", dateLocale);
out.write(format.format(date));
out.write(" ");
out.write(emailAddress);
out.write(" ");
out.write(distinguisher);
out.close();
return set(PARAM_TYPE_PERSONALISATION, bout.toByteArray());
}
catch (IOException e)
{
throw new IllegalStateException("Byte I/O failed: " + e);
}
}
/**
* Sets the {@link SkeinParameters#PARAM_TYPE_KEY_IDENTIFIER} parameter.
*/
public Builder setPublicKey(byte[] publicKey)
{
return set(PARAM_TYPE_PUBLIC_KEY, publicKey);
}
/**
* Sets the {@link SkeinParameters#PARAM_TYPE_KEY_IDENTIFIER} parameter.
*/
public Builder setKeyIdentifier(byte[] keyIdentifier)
{
return set(PARAM_TYPE_KEY_IDENTIFIER, keyIdentifier);
}
/**
* Sets the {@link SkeinParameters#PARAM_TYPE_NONCE} parameter.
*/
public Builder setNonce(byte[] nonce)
{
return set(PARAM_TYPE_NONCE, nonce);
}
/**
* Constructs a new {@link SkeinParameters} instance with the parameters provided to this
* builder.
*/
public SkeinParameters build()
{
return new SkeinParameters(parameters);
}
}
}