package net.i2p.data;
/*
* free (adj.): unencumbered; not under the control of others
* Written by jrandom in 2003 and released into the public domain
* with no warranty of any kind, either expressed or implied.
* It probably won't make your computer catch on fire, or eat
* your children, but it might. Use at your own risk.
*
*/
import java.util.Arrays;
import net.i2p.crypto.KeyGenerator;
import net.i2p.crypto.SigType;
/**
* Defines the SigningPrivateKey as defined by the I2P data structure spec.
* A signing private key is by default a 20 byte Integer. The private key represents only the
* exponent, not the primes, which are constant and defined in the crypto spec.
* This key varies from the PrivateKey in its usage (signing, not decrypting)
*
* As of release 0.9.8, keys of arbitrary length and type are supported.
* See SigType.
*
* @author jrandom
*/
public class SigningPrivateKey extends SimpleDataStructure {
private static final SigType DEF_TYPE = SigType.DSA_SHA1;
public final static int KEYSIZE_BYTES = DEF_TYPE.getPrivkeyLen();
private final SigType _type;
public SigningPrivateKey() {
this(DEF_TYPE);
}
/**
* @since 0.9.8
*/
public SigningPrivateKey(SigType type) {
super();
_type = type;
}
public SigningPrivateKey(byte data[]) {
this(DEF_TYPE, data);
}
/**
* @since 0.9.8
*/
public SigningPrivateKey(SigType type, byte data[]) {
super();
_type = type;
setData(data);
}
/** constructs from base64
* @param base64Data a string of base64 data (the output of .toBase64() called
* on a prior instance of SigningPrivateKey
*/
public SigningPrivateKey(String base64Data) throws DataFormatException {
this();
fromBase64(base64Data);
}
public int length() {
return _type.getPrivkeyLen();
}
/**
* @since 0.9.8
*/
public SigType getType() {
return _type;
}
/**
* Converts this signing private key to its public equivalent.
* As of 0.9.16, supports all key types.
*
* @return a SigningPublicKey object derived from this private key
* @throws IllegalArgumentException on bad key or unknown or unsupported type
*/
public SigningPublicKey toPublic() {
return KeyGenerator.getSigningPublicKey(this);
}
/**
* @since 0.9.8
*/
@Override
public String toString() {
StringBuilder buf = new StringBuilder(64);
buf.append('[').append(getClass().getSimpleName()).append(' ').append(_type).append(": ");
int length = length();
if (_data == null) {
buf.append("null");
} else if (length <= 32) {
buf.append(toBase64());
} else {
buf.append("size: ").append(Integer.toString(length));
}
buf.append(']');
return buf.toString();
}
/**
* @since 0.9.17
*/
@Override
public int hashCode() {
return DataHelper.hashCode(_type) ^ super.hashCode();
}
/**
* @since 0.9.17
*/
@Override
public boolean equals(Object obj) {
if (obj == this) return true;
if (obj == null || !(obj instanceof SigningPrivateKey)) return false;
SigningPrivateKey s = (SigningPrivateKey) obj;
return _type == s._type && Arrays.equals(_data, s._data);
}
}