org.jose4j.keys.EllipticCurves Maven / Gradle / Ivy
/*
* Copyright 2012-2017 Brian Campbell
*
* 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 org.jose4j.keys;
import java.math.BigInteger;
import java.security.spec.ECFieldFp;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.EllipticCurve;
import java.util.HashMap;
import java.util.Map;
/**
* Values for these curve parameters taken from FIPS PUB 186-3
* and http://www.nsa.gov/ia/_files/nist-routines.pdf
*/
public class EllipticCurves
{
public static final String P_256 = "P-256";
public static final String P_384 = "P-384";
public static final String P_521 = "P-521";
private static final Map nameToSpec = new HashMap();
private static final Map curveToName = new HashMap();
private static void addCurve(String name, ECParameterSpec spec)
{
nameToSpec.put(name, spec);
curveToName.put(spec.getCurve(), name);
}
public static ECParameterSpec getSpec(String name)
{
return nameToSpec.get(name);
}
public static String getName(EllipticCurve curve)
{
// equals and hashcode are defined on EllipticCurve so this works
return curveToName.get(curve);
}
// cofactor h (Thus, for these curves over prime fileds, the cofactor is always h = 1)
private static final int COFACTOR = 1;
public static final ECParameterSpec P256 = new ECParameterSpec(
new EllipticCurve(
// field the finite field that this elliptic curve is over.
new ECFieldFp(new BigInteger("115792089210356248762697446949407573530086143415290314195533631308867097853951")),
// a the first coefficient of this elliptic curve.
new BigInteger("115792089210356248762697446949407573530086143415290314195533631308867097853948"),
// b the second coefficient of this elliptic curve.
new BigInteger("41058363725152142129326129780047268409114441015993725554835256314039467401291")
),
//g the generator which is also known as the base point.
new ECPoint(
// gx
new BigInteger("48439561293906451759052585252797914202762949526041747995844080717082404635286"),
// gy
new BigInteger("36134250956749795798585127919587881956611106672985015071877198253568414405109")
),
// Order n
new BigInteger("115792089210356248762697446949407573529996955224135760342422259061068512044369"),
COFACTOR);
public static final ECParameterSpec P384 = new ECParameterSpec(
new EllipticCurve(
// field the finite field that this elliptic curve is over.
new ECFieldFp(new BigInteger("39402006196394479212279040100143613805079739270465" +
"44666794829340424572177149687032904726608825893800" +
"1861606973112319")),
// a the first coefficient of this elliptic curve.
new BigInteger("39402006196394479212279040100143613805079739270465" +
"44666794829340424572177149687032904726608825893800" +
"1861606973112316"),
// b the second coefficient of this elliptic curve.
new BigInteger("27580193559959705877849011840389048093056905856361" +
"56852142870730198868924130986086513626076488374510" +
"7765439761230575")
),
//g the generator which is also known as the base point.
new ECPoint(
// gx
new BigInteger("26247035095799689268623156744566981891852923491109" +
"21338781561590092551885473805008902238805397571978" +
"6650872476732087"),
// gy
new BigInteger("83257109614890299855467512895201081792878530488613" +
"15594709205902480503199884419224438643760392947333" +
"078086511627871")
),
// Order n
new BigInteger("39402006196394479212279040100143613805079739270465446667946905279627" +
"659399113263569398956308152294913554433653942643"),
COFACTOR);
public static final ECParameterSpec P521 = new ECParameterSpec(
new EllipticCurve(
// field the finite field that this elliptic curve is over.
new ECFieldFp(new BigInteger("68647976601306097149819007990813932172694353001433" +
"05409394463459185543183397656052122559640661454554" +
"97729631139148085803712198799971664381257402829111" +
"5057151")),
// a the first coefficient of this elliptic curve.
new BigInteger("68647976601306097149819007990813932172694353001433" +
"05409394463459185543183397656052122559640661454554" +
"97729631139148085803712198799971664381257402829111" +
"5057148"),
// b the second coefficient of this elliptic curve.
new BigInteger("10938490380737342745111123907668055699362075989516" +
"83748994586394495953116150735016013708737573759623" +
"24859213229670631330943845253159101291214232748847" +
"8985984")
),
//g the generator which is also known as the base point.
new ECPoint(
// gx
new BigInteger("26617408020502170632287687167233609607298591687569" +
"73147706671368418802944996427808491545080627771902" +
"35209424122506555866215711354557091681416163731589" +
"5999846"),
// gy
new BigInteger("37571800257700204635455072244911836035944551347697" +
"62486694567779615544477440556316691234405012945539" +
"56214444453728942852258566672919658081012434427757" +
"8376784")
),
// Order n
new BigInteger("68647976601306097149819007990813932172694353001433" +
"05409394463459185543183397655394245057746333217197" +
"53296399637136332111386476861244038034037280889270" +
"7005449"),
COFACTOR);
static
{
addCurve(P_256, EllipticCurves.P256);
addCurve(P_384, EllipticCurves.P384);
addCurve(P_521, EllipticCurves.P521);
}
}