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Java library for Javascript Object Signing and Encryption (JOSE) and
JSON Web Tokens (JWT)
/*
* nimbus-jose-jwt
*
* Copyright 2012-2016, Connect2id Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use
* this file except in compliance with the License. You may obtain a copy of the
* License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed
* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package com.nimbusds.jose.jwk;
import java.math.BigInteger;
import java.security.spec.ECFieldFp;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.EllipticCurve;
/**
* Elliptic curve parameter table.
*
* Supports the following standard EC JWK curves:
*
*
* - {@link com.nimbusds.jose.jwk.Curve#P_256}
*
- {@link com.nimbusds.jose.jwk.Curve#SECP256K1}
*
- {@link com.nimbusds.jose.jwk.Curve#P_384}
*
- {@link com.nimbusds.jose.jwk.Curve#P_521}
*
*
* @author Vladimir Dzhuvinov
* @author Aleksei Doroganov
* @version 2022-04-22
*/
public class ECParameterTable {
/**
* The parameter spec for a
* {@link com.nimbusds.jose.jwk.Curve#P_256} curve.
*/
private static final ECParameterSpec P_256_SPEC;
/**
* The parameter spec for a
* {@link com.nimbusds.jose.jwk.Curve#SECP256K1} curve.
*/
private static final ECParameterSpec SECP256K1_SPEC;
/**
* The parameter spec for a
* {@link com.nimbusds.jose.jwk.Curve#P_384} curve.
*/
private static final ECParameterSpec P_384_SPEC;
/**
* The parameter spec for a
* {@link com.nimbusds.jose.jwk.Curve#P_521} curve.
*/
private static final ECParameterSpec P_521_SPEC;
static {
// Values obtained from org.bouncycastle.jce.ECNamedCurveTable
P_256_SPEC = new ECParameterSpec(
new EllipticCurve(
new ECFieldFp(new BigInteger("115792089210356248762697446949407573530086143415290314195533631308867097853951")),
new BigInteger("115792089210356248762697446949407573530086143415290314195533631308867097853948"),
new BigInteger("41058363725152142129326129780047268409114441015993725554835256314039467401291")),
new ECPoint(
new BigInteger("48439561293906451759052585252797914202762949526041747995844080717082404635286"),
new BigInteger("36134250956749795798585127919587881956611106672985015071877198253568414405109")),
new BigInteger("115792089210356248762697446949407573529996955224135760342422259061068512044369"),
1);
SECP256K1_SPEC = new ECParameterSpec(
new EllipticCurve(
new ECFieldFp(new BigInteger("115792089237316195423570985008687907853269984665640564039457584007908834671663")),
new BigInteger("0"),
new BigInteger("7")),
new ECPoint(
new BigInteger("55066263022277343669578718895168534326250603453777594175500187360389116729240"),
new BigInteger("32670510020758816978083085130507043184471273380659243275938904335757337482424")),
new BigInteger("115792089237316195423570985008687907852837564279074904382605163141518161494337"),
1);
P_384_SPEC = new ECParameterSpec(
new EllipticCurve(
new ECFieldFp(new BigInteger("39402006196394479212279040100143613805079739270465446667948293404245721771496870329047266088258938001861606973112319")),
new BigInteger("39402006196394479212279040100143613805079739270465446667948293404245721771496870329047266088258938001861606973112316"),
new BigInteger("27580193559959705877849011840389048093056905856361568521428707301988689241309860865136260764883745107765439761230575")),
new ECPoint(
new BigInteger("26247035095799689268623156744566981891852923491109213387815615900925518854738050089022388053975719786650872476732087"),
new BigInteger("8325710961489029985546751289520108179287853048861315594709205902480503199884419224438643760392947333078086511627871")),
new BigInteger("39402006196394479212279040100143613805079739270465446667946905279627659399113263569398956308152294913554433653942643"),
1);
P_521_SPEC = new ECParameterSpec(
new EllipticCurve(
new ECFieldFp(new BigInteger("6864797660130609714981900799081393217269435300143305409394463459185543183397656052122559640661454554977296311391480858037121987999716643812574028291115057151")),
new BigInteger("6864797660130609714981900799081393217269435300143305409394463459185543183397656052122559640661454554977296311391480858037121987999716643812574028291115057148"),
new BigInteger("1093849038073734274511112390766805569936207598951683748994586394495953116150735016013708737573759623248592132296706313309438452531591012912142327488478985984")),
new ECPoint(
new BigInteger("2661740802050217063228768716723360960729859168756973147706671368418802944996427808491545080627771902352094241225065558662157113545570916814161637315895999846"),
new BigInteger("3757180025770020463545507224491183603594455134769762486694567779615544477440556316691234405012945539562144444537289428522585666729196580810124344277578376784")),
new BigInteger("6864797660130609714981900799081393217269435300143305409394463459185543183397655394245057746333217197532963996371363321113864768612440380340372808892707005449"),
1);
}
/**
* Gets the parameter specification for the specified elliptic curve.
*
* @param curve The JWK elliptic curve. May be {@code null}.
*
* @return The EC parameter spec, {@code null} if it cannot be
* determined.
*/
public static ECParameterSpec get(final Curve curve) {
if (Curve.P_256.equals(curve)) {
return P_256_SPEC;
} else if (Curve.SECP256K1.equals(curve)) {
return SECP256K1_SPEC;
} else if (Curve.P_384.equals(curve)) {
return P_384_SPEC;
} else if (Curve.P_521.equals(curve)) {
return P_521_SPEC;
} else {
return null;
}
}
/**
* Gets the JWK elliptic curve for the specified parameter
* specification.
*
* @param spec The EC parameter spec. May be {@code null}.
*
* @return The JWK elliptic curve, {@code null} if it cannot be
* determined.
*/
public static Curve get(final ECParameterSpec spec) {
if (spec == null) {
return null;
}
if (spec.getCurve().getField().getFieldSize() == P_256_SPEC.getCurve().getField().getFieldSize() &&
spec.getCurve().getA().equals(P_256_SPEC.getCurve().getA()) &&
spec.getCurve().getB().equals(P_256_SPEC.getCurve().getB()) &&
spec.getGenerator().getAffineX().equals(P_256_SPEC.getGenerator().getAffineX()) &&
spec.getGenerator().getAffineY().equals(P_256_SPEC.getGenerator().getAffineY()) &&
spec.getOrder().equals(P_256_SPEC.getOrder()) &&
spec.getCofactor() == P_256_SPEC.getCofactor()) {
return Curve.P_256;
} else if (spec.getCurve().getField().getFieldSize() == SECP256K1_SPEC.getCurve().getField().getFieldSize() &&
spec.getCurve().getA().equals(SECP256K1_SPEC.getCurve().getA()) &&
spec.getCurve().getB().equals(SECP256K1_SPEC.getCurve().getB()) &&
spec.getGenerator().getAffineX().equals(SECP256K1_SPEC.getGenerator().getAffineX()) &&
spec.getGenerator().getAffineY().equals(SECP256K1_SPEC.getGenerator().getAffineY()) &&
spec.getOrder().equals(SECP256K1_SPEC.getOrder()) &&
spec.getCofactor() == SECP256K1_SPEC.getCofactor()) {
return Curve.SECP256K1;
} else if (spec.getCurve().getField().getFieldSize() == P_384_SPEC.getCurve().getField().getFieldSize() &&
spec.getCurve().getA().equals(P_384_SPEC.getCurve().getA()) &&
spec.getCurve().getB().equals(P_384_SPEC.getCurve().getB()) &&
spec.getGenerator().getAffineX().equals(P_384_SPEC.getGenerator().getAffineX()) &&
spec.getGenerator().getAffineY().equals(P_384_SPEC.getGenerator().getAffineY()) &&
spec.getOrder().equals(P_384_SPEC.getOrder()) &&
spec.getCofactor() == P_384_SPEC.getCofactor()) {
return Curve.P_384;
} else if (spec.getCurve().getField().getFieldSize() == P_521_SPEC.getCurve().getField().getFieldSize() &&
spec.getCurve().getA().equals(P_521_SPEC.getCurve().getA()) &&
spec.getCurve().getB().equals(P_521_SPEC.getCurve().getB()) &&
spec.getGenerator().getAffineX().equals(P_521_SPEC.getGenerator().getAffineX()) &&
spec.getGenerator().getAffineY().equals(P_521_SPEC.getGenerator().getAffineY()) &&
spec.getOrder().equals(P_521_SPEC.getOrder()) &&
spec.getCofactor() == P_521_SPEC.getCofactor()) {
return Curve.P_521;
} else {
return null;
}
}
/**
* Prevents public instantiation.
*/
private ECParameterTable() {
}
}
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