1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package libcore.tlswire.handshake; 18 19 /** 20 * {@code EllipticCurve} enum from RFC 4492 section 5.1.1. Curves are assigned 21 * via the 22 * <a href="https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-8">IANA registry</a>. 23 */ 24 public enum EllipticCurve { 25 SECT163K1(1, "sect163k1"), 26 SECT163R1(2, "sect163r1"), 27 SECT163R2(3, "sect163r2"), 28 SECT193R1(4, "sect193r1"), 29 SECT193R2(5, "sect193r2"), 30 SECT233K1(6, "sect233k1"), 31 SECT233R1(7, "sect233r1"), 32 SECT239K1(8, "sect239k1"), 33 SECT283K1(9, "sect283k1"), 34 SECT283R1(10, "sect283r1"), 35 SECT409K1(11, "sect409k1"), 36 SECT409R1(12, "sect409r1"), 37 SECT571K1(13, "sect571k1"), 38 SECT571R1(14, "sect571r1"), 39 SECP160K1(15, "secp160k1"), 40 SECP160R1(16, "secp160r1"), 41 SECP160R2(17, "secp160r2"), 42 SECP192K1(18, "secp192k1"), 43 SECP192R1(19, "secp192r1"), 44 SECP224K1(20, "secp224k1"), 45 SECP224R1(21, "secp224r1"), 46 SECP256K1(22, "secp256k1"), 47 SECP256R1(23, "secp256r1"), 48 SECP384R1(24, "secp384r1"), 49 SECP521R1(25, "secp521r1"), 50 BRAINPOOLP256R1(26, "brainpoolP256r1"), 51 BRAINPOOLP384R1(27, "brainpoolP384r1"), 52 BRAINPOOLP521R1(28, "brainpoolP521r1"), 53 X25519(29, "x25519"), 54 X448(30, "x448"), 55 ARBITRARY_PRIME(0xFF01, "arbitrary_explicit_prime_curves"), 56 ARBITRARY_CHAR2(0xFF02, "arbitrary_explicit_char2_curves"); 57 58 public final int identifier; 59 public final String name; 60 61 private EllipticCurve(int identifier, String name) { 62 this.identifier = identifier; 63 this.name = name; 64 } 65 66 public static EllipticCurve fromIdentifier(int identifier) { 67 for (EllipticCurve curve : values()) { 68 if (curve.identifier == identifier) { 69 return curve; 70 } 71 } 72 throw new AssertionError("Unknown curve identifier " + identifier); 73 } 74 75 @Override 76 public String toString() { 77 StringBuilder sb = new StringBuilder(name); 78 sb.append(" ("); 79 sb.append(identifier); 80 sb.append(')'); 81 return sb.toString(); 82 } 83 } 84
