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/**
* EdDSA-Java by str4d
*
* To the extent possible under law, the person who associated CC0 with
* EdDSA-Java has waived all copyright and related or neighboring rights
* to EdDSA-Java.
*
* You should have received a copy of the CC0 legalcode along with this
* work. If not, see <https://creativecommons.org/publicdomain/zero/1.0/>.
*
*/
package net.i2p.crypto.eddsa.spec;
import java.util.Hashtable;
import java.util.Locale;
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.
* @author str4d
*
*/
public class EdDSANamedCurveTable {
public static final String ED_25519 = "Ed25519";
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 ed25519 = new EdDSANamedCurveSpec(
ED_25519,
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(EdDSANamedCurveSpec curve) {
curves.put(curve.getName().toLowerCase(Locale.ENGLISH), curve);
}
static void defineCurveAlias(String name, String alias) {
EdDSANamedCurveSpec curve = curves.get(name.toLowerCase(Locale.ENGLISH));
if (curve == null) {
throw new IllegalStateException();
}
curves.put(alias.toLowerCase(Locale.ENGLISH), curve);
}
static {
// RFC 8032
defineCurve(ed25519);
}
public static EdDSANamedCurveSpec getByName(String name) {
return curves.get(name.toLowerCase(Locale.ENGLISH));
}
}
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