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| 1 | +/* |
| 2 | + * To change this license header, choose License Headers in Project Properties. |
| 3 | + * To change this template file, choose Tools | Templates |
| 4 | + * and open the template in the editor. |
| 5 | + */ |
| 6 | +package COSE; |
| 7 | + |
| 8 | +import java.util.ArrayList; |
| 9 | + |
| 10 | +/** |
| 11 | + * |
| 12 | + * @author Jim |
| 13 | + */ |
| 14 | +public class ASN1 { |
| 15 | + // 1.2.840.10045.3.1.7 |
| 16 | + public static final byte[] Oid_secp256r1 = new byte[]{0x06, 0x08, 0x2A, (byte) 0x86, 0x48, (byte) 0xCE, 0x3D, 0x03, 0x01, 0x07}; |
| 17 | + // 1.3.132.0.34 |
| 18 | + public static final byte[] Oid_secp384r1 = new byte[]{0x06, 0x05, 0x2B, (byte) 0x81, 0x04, 0x00, 0x22}; |
| 19 | + // 1.3.132.0.35 |
| 20 | + public static final byte[] Oid_secp521r1 = new byte[]{0x06, 0x05, 0x2B, (byte) 0x81, 0x04, 0x00, 0x23}; |
| 21 | + |
| 22 | + static final byte[] oid_ecPublicKey = new byte[]{0x06, 0x07, 0x2a, (byte) 0x86, 0x48, (byte) 0xce, 0x3d, 0x2, 0x1}; |
| 23 | + |
| 24 | + |
| 25 | + private static final byte[] SequenceX = new byte[]{0x30}; |
| 26 | + |
| 27 | + /** |
| 28 | + * Encode a subject public key info structure from an oid and the data bytes |
| 29 | + * for the key |
| 30 | + * |
| 31 | + * @param oid - encoded Object Identifier |
| 32 | + * @param keyBytes - encoded key bytes |
| 33 | + * @return - encoded SPKI |
| 34 | + */ |
| 35 | + public static byte[] EncodeSubjectPublicKeyInfo(byte[] oid, byte[] keyBytes) throws CoseException |
| 36 | + { |
| 37 | + // SPKI ::= SEQUENCE { |
| 38 | + // algorithm SEQUENCE { |
| 39 | + // oid = id-ecPublicKey {1 2 840 10045 2} |
| 40 | + // namedCurve = oid for algorithm |
| 41 | + // } |
| 42 | + // subjectPublicKey BIT STRING CONTAINS key bytes |
| 43 | + // } |
| 44 | + // } |
| 45 | + try { |
| 46 | + |
| 47 | + ArrayList<byte[]> xxx = new ArrayList<byte[]>(); |
| 48 | + xxx.add(AlgorithmIdentifier(oid_ecPublicKey, oid)); |
| 49 | + xxx.add(new byte[]{3}); |
| 50 | + xxx.add(GetLength(keyBytes.length+1)); |
| 51 | + xxx.add(new byte[]{0}); |
| 52 | + xxx.add(keyBytes); |
| 53 | + |
| 54 | + return Sequence(xxx); |
| 55 | + } |
| 56 | + catch (ArrayIndexOutOfBoundsException e) { |
| 57 | + System.out.print(e.toString()); |
| 58 | + throw e; |
| 59 | + } |
| 60 | + } |
| 61 | + |
| 62 | + public static byte[] EncodePKCS8(byte[] oid, byte[] keyBytes, byte[] spki) throws CoseException |
| 63 | + { |
| 64 | + // ECPrivateKey ::= SEQUENCE { |
| 65 | + // version INTEGER {1} |
| 66 | + // privateKey OCTET STRING |
| 67 | + // parameters [0] OBJECT IDENTIFIER = named curve |
| 68 | + // public key [1] BIT STRING OPTIONAL |
| 69 | + // } |
| 70 | + // |
| 71 | + // PKCS#8 ::= SEQUENCE { |
| 72 | + // version INTEGER {0} |
| 73 | + // privateKeyALgorithm SEQUENCE { |
| 74 | + // algorithm OID, |
| 75 | + // parameters ANY |
| 76 | + // } |
| 77 | + // privateKey ECPrivateKey, |
| 78 | + // attributes [0] IMPLICIT Attributes OPTIONAL |
| 79 | + // } |
| 80 | + |
| 81 | + try { |
| 82 | + ArrayList<byte[]> xxx = new ArrayList<byte[]>(); |
| 83 | + xxx.add(new byte[]{2, 1, 1}); |
| 84 | + xxx.add(new byte[]{4}); |
| 85 | + xxx.add(GetLength(keyBytes.length)); |
| 86 | + xxx.add(keyBytes); |
| 87 | + xxx.add(new byte[]{(byte)0xa0}); |
| 88 | + xxx.add(GetLength(oid.length)); |
| 89 | + xxx.add(oid); |
| 90 | + if (spki != null) { |
| 91 | + xxx.add(new byte[]{(byte)0xa1}); |
| 92 | + xxx.add(GetLength(spki.length)); |
| 93 | + xxx.add(spki); |
| 94 | + } |
| 95 | + |
| 96 | + byte[] ecPrivateKey = Sequence(xxx); |
| 97 | + |
| 98 | + xxx = new ArrayList<byte[]>(); |
| 99 | + xxx.add(new byte[]{2, 1, 0}); |
| 100 | + xxx.add(AlgorithmIdentifier(oid_ecPublicKey, oid)); |
| 101 | + xxx.add(new byte[]{4}); |
| 102 | + xxx.add(GetLength(ecPrivateKey.length)); |
| 103 | + xxx.add(ecPrivateKey); |
| 104 | + |
| 105 | + return Sequence(xxx); |
| 106 | + } |
| 107 | + catch (ArrayIndexOutOfBoundsException e) { |
| 108 | + System.out.print(e.toString()); |
| 109 | + throw e; |
| 110 | + } |
| 111 | + } |
| 112 | + public static byte[] EncodeSignature(byte[] r, byte[] s) throws CoseException { |
| 113 | + ArrayList<byte[]> x = new ArrayList<byte[]>(); |
| 114 | + x.add(UnsignedInteger(r)); |
| 115 | + x.add(UnsignedInteger(s)); |
| 116 | + |
| 117 | + return Sequence(x); |
| 118 | + } |
| 119 | + |
| 120 | + private static byte[] AlgorithmIdentifier(byte[] oid, byte[] params) throws CoseException |
| 121 | + { |
| 122 | + ArrayList<byte[]> xxx = new ArrayList<byte[]>(); |
| 123 | + xxx.add(oid); |
| 124 | + if (params != null) { |
| 125 | + xxx.add(params); |
| 126 | + } |
| 127 | + return Sequence(xxx); |
| 128 | + } |
| 129 | + private static byte[] Sequence(ArrayList<byte[]> members) throws CoseException |
| 130 | + { |
| 131 | + byte[] y = ToBytes(members); |
| 132 | + ArrayList<byte[]> x = new ArrayList<byte[]>(); |
| 133 | + x.add(SequenceX); |
| 134 | + x.add(GetLength(y.length)); |
| 135 | + x.add(y); |
| 136 | + |
| 137 | + return ToBytes(x); |
| 138 | + } |
| 139 | + private static byte[] UnsignedInteger(byte[] i) throws CoseException { |
| 140 | + int pad = 0, offset = 0; |
| 141 | + |
| 142 | + while (offset < i.length && i[offset] == 0) { |
| 143 | + offset++; |
| 144 | + } |
| 145 | + |
| 146 | + if (offset == i.length) { |
| 147 | + return new byte[] {0x02, 0x01, 0x00}; |
| 148 | + } |
| 149 | + if ((i[offset] & 0x80) != 0) { |
| 150 | + pad++; |
| 151 | + } |
| 152 | + int length = i.length - offset; |
| 153 | + byte[] der = new byte[2 + length + pad]; |
| 154 | + der[0] = 0x02; |
| 155 | + der[1] = (byte)(length + pad); |
| 156 | + System.arraycopy(i, offset, der, 2 + pad, length); |
| 157 | + |
| 158 | + return der; |
| 159 | + } |
| 160 | + |
| 161 | + private static byte[] GetLength(int x) throws CoseException |
| 162 | + { |
| 163 | + if (x <= 127) { |
| 164 | + return new byte[]{(byte)x}; |
| 165 | + } |
| 166 | + else if ( x < 256) { |
| 167 | + return new byte[]{(byte) 0x81, (byte) x}; |
| 168 | + } |
| 169 | + throw new CoseException("Error in ASN1.GetLength"); |
| 170 | + } |
| 171 | + |
| 172 | + private static byte[] ToBytes(ArrayList<byte[]> x) |
| 173 | + { |
| 174 | + int l = 0; |
| 175 | + for (byte[] r : x) { |
| 176 | + l += r.length; |
| 177 | + } |
| 178 | + |
| 179 | + byte[] b = new byte[l]; |
| 180 | + l = 0; |
| 181 | + for (byte[] r : x) { |
| 182 | + System.arraycopy(r, 0, b, l, r.length); |
| 183 | + l += r.length; |
| 184 | + } |
| 185 | + |
| 186 | + return b; |
| 187 | + } |
| 188 | + |
| 189 | + |
| 190 | +} |
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