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*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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package sun.security.ssl;
import java.io.IOException;
import java.security.spec.ECParameterSpec;
import java.util.HashMap;
import java.util.Map;
import javax.net.ssl.SSLProtocolException;
final class SupportedEllipticCurvesExtension extends HelloExtension {
// the extension value to send in the ClientHello message
static final SupportedEllipticCurvesExtension DEFAULT;
private static final boolean fips;
static {
int[] ids;
fips = SunJSSE.isFIPS();
if (fips == false) {
ids = new int[] {
// NIST curves first
// prefer NIST P-256, rest in order of increasing key length
23, 1, 3, 19, 21, 6, 7, 9, 10, 24, 11, 12, 25, 13, 14,
// non-NIST curves
15, 16, 17, 2, 18, 4, 5, 20, 8, 22,
};
} else {
ids = new int[] {
// same as above, but allow only NIST curves in FIPS mode
23, 1, 3, 19, 21, 6, 7, 9, 10, 24, 11, 12, 25, 13, 14,
};
}
DEFAULT = new SupportedEllipticCurvesExtension(ids);
}
private final int[] curveIds;
private SupportedEllipticCurvesExtension(int[] curveIds) {
super(ExtensionType.EXT_ELLIPTIC_CURVES);
this.curveIds = curveIds;
}
SupportedEllipticCurvesExtension(HandshakeInStream s, int len)
throws IOException {
super(ExtensionType.EXT_ELLIPTIC_CURVES);
int k = s.getInt16();
if (((len & 1) != 0) || (k + 2 != len)) {
throw new SSLProtocolException("Invalid " + type + " extension");
}
curveIds = new int[k >> 1];
for (int i = 0; i < curveIds.length; i++) {
curveIds[i] = s.getInt16();
}
}
boolean contains(int index) {
for (int curveId : curveIds) {
if (index == curveId) {
return true;
}
}
return false;
}
// Return a reference to the internal curveIds array.
// The caller must NOT modify the contents.
int[] curveIds() {
return curveIds;
}
@Override
int length() {
return 6 + (curveIds.length << 1);
}
@Override
void send(HandshakeOutStream s) throws IOException {
s.putInt16(type.id);
int k = curveIds.length << 1;
s.putInt16(k + 2);
s.putInt16(k);
for (int curveId : curveIds) {
s.putInt16(curveId);
}
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Extension " + type + ", curve names: {");
boolean first = true;
for (int curveId : curveIds) {
if (first) {
first = false;
} else {
sb.append(", ");
}
// first check if it is a known named curve, then try other cases.
String oid = getCurveOid(curveId);
if (oid != null) {
ECParameterSpec spec = JsseJce.getECParameterSpec(oid);
// this toString() output will look nice for the current
// implementation of the ECParameterSpec class in the Sun
// provider, but may not look good for other implementations.
if (spec != null) {
sb.append(spec.toString().split(" ")[0]);
} else {
sb.append(oid);
}
} else if (curveId == ARBITRARY_PRIME) {
sb.append("arbitrary_explicit_prime_curves");
} else if (curveId == ARBITRARY_CHAR2) {
sb.append("arbitrary_explicit_char2_curves");
} else {
sb.append("unknown curve " + curveId);
}
}
sb.append("}");
return sb.toString();
}
// Test whether we support the curve with the given index.
static boolean isSupported(int index) {
if ((index <= 0) || (index >= NAMED_CURVE_OID_TABLE.length)) {
return false;
}
if (fips == false) {
// in non-FIPS mode, we support all valid indices
return true;
}
return DEFAULT.contains(index);
}
static int getCurveIndex(ECParameterSpec params) {
String oid = JsseJce.getNamedCurveOid(params);
if (oid == null) {
return -1;
}
Integer n = curveIndices.get(oid);
return (n == null) ? -1 : n;
}
static String getCurveOid(int index) {
if ((index > 0) && (index < NAMED_CURVE_OID_TABLE.length)) {
return NAMED_CURVE_OID_TABLE[index];
}
return null;
}
private final static int ARBITRARY_PRIME = 0xff01;
private final static int ARBITRARY_CHAR2 = 0xff02;
// See sun.security.ec.NamedCurve for the OIDs
private final static String[] NAMED_CURVE_OID_TABLE = new String[] {
null, // (0) unused
"1.3.132.0.1", // (1) sect163k1, NIST K-163
"1.3.132.0.2", // (2) sect163r1
"1.3.132.0.15", // (3) sect163r2, NIST B-163
"1.3.132.0.24", // (4) sect193r1
"1.3.132.0.25", // (5) sect193r2
"1.3.132.0.26", // (6) sect233k1, NIST K-233
"1.3.132.0.27", // (7) sect233r1, NIST B-233
"1.3.132.0.3", // (8) sect239k1
"1.3.132.0.16", // (9) sect283k1, NIST K-283
"1.3.132.0.17", // (10) sect283r1, NIST B-283
"1.3.132.0.36", // (11) sect409k1, NIST K-409
"1.3.132.0.37", // (12) sect409r1, NIST B-409
"1.3.132.0.38", // (13) sect571k1, NIST K-571
"1.3.132.0.39", // (14) sect571r1, NIST B-571
"1.3.132.0.9", // (15) secp160k1
"1.3.132.0.8", // (16) secp160r1
"1.3.132.0.30", // (17) secp160r2
"1.3.132.0.31", // (18) secp192k1
"1.2.840.10045.3.1.1", // (19) secp192r1, NIST P-192
"1.3.132.0.32", // (20) secp224k1
"1.3.132.0.33", // (21) secp224r1, NIST P-224
"1.3.132.0.10", // (22) secp256k1
"1.2.840.10045.3.1.7", // (23) secp256r1, NIST P-256
"1.3.132.0.34", // (24) secp384r1, NIST P-384
"1.3.132.0.35", // (25) secp521r1, NIST P-521
};
private final static Map<String,Integer> curveIndices;
static {
curveIndices = new HashMap<String,Integer>();
for (int i = 1; i < NAMED_CURVE_OID_TABLE.length; i++) {
curveIndices.put(NAMED_CURVE_OID_TABLE[i], i);
}
}
}