Examples with UnsupportedCurveException io.churchkey.ec.UnsupportedCurveException used on opensource projects

Example 1 with UnsupportedCurveException

use of io.churchkey.ec.UnsupportedCurveException in project churchkey by tomitribe.

the class BeginPrivateKey method decodeEcKey.

/**
 * EC Keys start out with this wrapper identifying the curve by OID
 *
 *     0:d=0  hl=2 l= 112 cons: SEQUENCE
 *     2:d=1  hl=2 l=   1 prim:  INTEGER           :00
 *     5:d=1  hl=2 l=  20 cons:  SEQUENCE
 *     7:d=2  hl=2 l=   7 prim:   OBJECT            :id-ecPublicKey
 *    16:d=2  hl=2 l=   9 prim:   OBJECT            :brainpoolP192r1
 *    27:d=1  hl=2 l=  85 prim:  OCTET STRING
 *       0000 - 30 53 02 01 01 04 18 88-9f 26 37 f9 f5 1f da 16   0S.......&7.....
 *       0010 - 1c b0 4c ce 79 09 36 b0-b6 8f 22 80 4d a0 ff a1   ..L.y.6...".M...
 *       0020 - 34 03 32 00 04 46 c1 7d-10 61 08 39 73 14 45 d0   4.2..F.}.a.9s.E.
 *       0030 - 8d 3b ac 12 05 a5 ef 45-d3 fb 33 cf 91 81 e8 43   .;.....E..3....C
 *       0040 - dd ab cb b7 de 04 64 b0-82 a6 59 27 c9 0d b2 25   ......d...Y'...%
 *       0050 - 32 20 c0 d6 38                                    2 ..8
 *
 * The above OCTET STRING at byte 27 (in this example) contains the actual key values
 * and is in the following format once decoded.
 *
 *    0:d=0  hl=2 l=  83 cons: SEQUENCE
 *     2:d=1  hl=2 l=   1 prim:  INTEGER           :01
 *     5:d=1  hl=2 l=  24 prim:  OCTET STRING
 *       0000 - 88 9f 26 37 f9 f5 1f da-16 1c b0 4c ce 79 09 36   ..&7.......L.y.6
 *       0010 - b0 b6 8f 22 80 4d a0 ff-                          ...".M..
 *    31:d=1  hl=2 l=  52 cons:  cont [ 1 ]
 *    33:d=2  hl=2 l=  50 prim:   BIT STRING
 *       0000 - 00 04 46 c1 7d 10 61 08-39 73 14 45 d0 8d 3b ac   ..F.}.a.9s.E..;.
 *       0010 - 12 05 a5 ef 45 d3 fb 33-cf 91 81 e8 43 dd ab cb   ....E..3....C...
 *       0020 - b7 de 04 64 b0 82 a6 59-27 c9 0d b2 25 32 20 c0   ...d...Y'...%2 .
 *       0030 - d6 38                                             .8
 *
 * The above OCTET STRING contains the private key BigInteger.
 * The BIT STRING contains the public key ECPoint (x, y) values.
 */
private static Key decodeEcKey(final byte[] bytes) throws IOException {
    final Ecdsa.Private.Builder ecdsa = Ecdsa.Private.builder();
    final DerParser d1 = new DerParser(bytes);
    final Asn1Object d1o1 = d1.readObject().assertType(Asn1Type.SEQUENCE);
    {
        final DerParser d2 = new DerParser(d1o1.getValue());
        final Asn1Object d2o1 = d2.readObject().assertType(Asn1Type.INTEGER);
        final Asn1Object d2o2 = d2.readObject().assertType(Asn1Type.SEQUENCE);
        {
            final DerParser d3 = new DerParser(d2o2.getValue());
            final Asn1Object d3o1 = d3.readObject().assertType(Asn1Type.OBJECT_IDENTIFIER);
            final Asn1Object d3o2 = d3.readObject();
            if (d3o2.isType(Asn1Type.OBJECT_IDENTIFIER)) {
                /*
                     * An OID naming a curve is encoded
                     */
                final Oid oid = d3o2.asOID();
                final Curve curve = Curve.resolve(oid);
                if (curve == null) {
                    throw new UnsupportedCurveException(oid.toString());
                }
                ecdsa.curve(curve);
            } else if (d3o2.isType(Asn1Type.SEQUENCE)) {
                /*
                     * The actual curve parameters are encoded
                     */
                final ECParameterSpec parameterSpec = EcCurveParams.parseSequence(d3o2);
                ecdsa.spec(parameterSpec);
            }
        }
        final Asn1Object d2o3 = d2.readObject().assertType(Asn1Type.OCTET_STRING);
        {
            final DerParser d3 = new DerParser(d2o3.getValue());
            final Asn1Object d3o1 = d3.readObject().assertType(Asn1Type.SEQUENCE);
            {
                final DerParser d4 = new DerParser(d3o1.getValue());
                final Asn1Object d4o1 = d4.readObject().assertType(Asn1Type.INTEGER);
                final Asn1Object d4o2 = d4.readObject().assertType(Asn1Type.OCTET_STRING);
                final Asn1Object d4o3 = d4.readObject();
                if (d4o3 != null && d4o3.isType(Asn1Type.BOOLEAN)) {
                    final DerParser d5 = new DerParser(d4o3.getValue());
                    final Asn1Object d5o1 = d5.readObject().assertType(Asn1Type.BIT_STRING);
                    final byte[] value = Bytes.trim(d5o1.getValue());
                    final ECPoint ecPoint = EcPoints.fromBytes(value);
                    ecdsa.x(ecPoint.getAffineX());
                    ecdsa.y(ecPoint.getAffineY());
                }
                ecdsa.d(new BigInteger(1, Bytes.trim(d4o2.getValue())));
                final Ecdsa.Private build = ecdsa.build();
                final ECPrivateKey privateKey = build.toKey();
                final ECPublicKey publicKey = build.getX() != null && build.getY() != null ? build.toPublic().toKey() : null;
                return new Key(privateKey, publicKey, Key.Type.PRIVATE, EC, Key.Format.PEM);
            }
        }
    }
}