package net.i2p.crypto.eddsa.spec;
import java.util.Hashtable;
import net.i2p.crypto.eddsa.Utils;
import net.i2p.crypto.eddsa.math.Curve;
import net.i2p.crypto.eddsa.math.Field;
import net.i2p.crypto.eddsa.math.ed25519.Ed25519LittleEndianEncoding;
import net.i2p.crypto.eddsa.math.ed25519.Ed25519ScalarOps;
/**
* The named EdDSA curves.
*
* @since 0.9.15
* @author str4d
*
*/
public class EdDSANamedCurveTable {
public static final String CURVE_ED25519_SHA512 = "ed25519-sha-512";
private static final Field ed25519field = new Field(
256, // b
Utils.hexToBytes("edffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f"), // q
new Ed25519LittleEndianEncoding());
private static final Curve ed25519curve = new Curve(ed25519field,
Utils.hexToBytes("a3785913ca4deb75abd841414d0a700098e879777940c78c73fe6f2bee6c0352"), // d
ed25519field.fromByteArray(Utils.hexToBytes("b0a00e4a271beec478e42fad0618432fa7d7fb3d99004d2b0bdfc14f8024832b"))); // I
private static final EdDSANamedCurveSpec ed25519sha512 = new EdDSANamedCurveSpec(
CURVE_ED25519_SHA512,
ed25519curve,
"SHA-512", // H
new Ed25519ScalarOps(), // l
ed25519curve.createPoint( // B
Utils.hexToBytes("5866666666666666666666666666666666666666666666666666666666666666"),
true)); // Precompute tables for B
private static final Hashtable<String, EdDSANamedCurveSpec> curves = new Hashtable<String, EdDSANamedCurveSpec>();
public static void defineCurve(String name, EdDSANamedCurveSpec curve) {
curves.put(name, curve);
}
static {
defineCurve(CURVE_ED25519_SHA512, ed25519sha512);
}
public static EdDSANamedCurveSpec getByName(String name) {
return curves.get(name);
}
}