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Crypto: Stubs for encryption key types

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This commit is contained in:
zzz
2014-12-17 14:41:24 +00:00
parent eb46f74e24
commit 60017f7c55
4 changed files with 292 additions and 0 deletions
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37
core/java/src/net/i2p/crypto/CryptoConstants.java
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@@ -29,7 +29,9 @@ package net.i2p.crypto;
* POSSIBILITY OF SUCH DAMAGE.
*/
import java.lang.reflect.Constructor;
import java.math.BigInteger;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.DSAParameterSpec;
import net.i2p.util.NativeBigInteger;
@@ -37,6 +39,9 @@ import net.i2p.util.NativeBigInteger;
/**
* Prime for ElGamal from http://tools.ietf.org/html/rfc3526
* Primes for DSA: Generated by TheCrypto http://article.gmane.org/gmane.comp.security.invisiblenet.iip.devel/343
*
* See also: ECConstants, RSAConstants
*
*/
public class CryptoConstants {
public static final BigInteger dsap = new NativeBigInteger(
@@ -52,6 +57,8 @@ public class CryptoConstants {
+ "985e43d136cdcfc6bd5409cd2f450821142a5e6f8eb1c3ab5d0484b8129fcf17bce4f7f3"
+ "3321c3cb3dbb14a905e7b2b3e93be4708cbcc82",
16);
/** 2048-bit MODP Group from RFC 3526 */
public static final BigInteger elgp = new NativeBigInteger("FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1"
+ "29024E088A67CC74020BBEA63B139B22514A08798E3404DD"
+ "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245"
@@ -63,10 +70,40 @@ public class CryptoConstants {
+ "E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9"
+ "DE2BCBF6955817183995497CEA956AE515D2261898FA0510"
+ "15728E5A8AACAA68FFFFFFFFFFFFFFFF", 16);
public static final BigInteger elgg = new NativeBigInteger("2");
/**
* @since 0.9.9
*/
public static final DSAParameterSpec DSA_SHA1_SPEC = new DSAParameterSpec(dsap, dsaq, dsag);
/**
* This will be org.bouncycastle.jce.spec.ElgamalParameterSpec
* if BC is available, otherwise it
* will be net.i2p.crypto.ElgamalParameterSpec
*
* @since 0.9.18
*/
public static final AlgorithmParameterSpec ELGAMAL_2048_SPEC;
static {
AlgorithmParameterSpec spec;
if (ECConstants.isBCAvailable()) {
try {
Class<?> cls = Class.forName("org.bouncycastle.jce.spec.ElGamalParameterSpec");
Constructor<?> con = cls.getConstructor(new Class[] {BigInteger.class, BigInteger.class});
spec = (AlgorithmParameterSpec)con.newInstance(new Object[] {elgp, elgg});
//System.out.println("BC ElG spec loaded");
} catch (Exception e) {
//System.out.println("BC ElG spec failed");
//e.printStackTrace();
spec = new ElGamalParameterSpec(elgp, elgg);
}
} else {
//System.out.println("BC not available");
spec = new ElGamalParameterSpec(elgp, elgg);
}
ELGAMAL_2048_SPEC = spec;
}
}

66
core/java/src/net/i2p/crypto/ElGamalParameterSpec.java Normal file
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@@ -0,0 +1,66 @@
package net.i2p.crypto;
/*
* Copyright (c) 2000 - 2013 The Legion of the Bouncy Castle Inc. (http://www.bouncycastle.org)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
* is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
*THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
import java.math.BigInteger;
import java.security.spec.AlgorithmParameterSpec;
/**
* Copied from org.bouncycastle.jce.spec
* This can't actually be passed to the BC provider, we would have to
* use reflection to create a "real" org.bouncycasle.jce.spec.ElGamalParameterSpec.
*
* @since 0.9.18
*/
public class ElGamalParameterSpec implements AlgorithmParameterSpec {
private final BigInteger p;
private final BigInteger g;
/**
* Constructs a parameter set for Diffie-Hellman, using a prime modulus
* <code>p</code> and a base generator <code>g</code>.
*
* @param p the prime modulus
* @param g the base generator
*/
public ElGamalParameterSpec(BigInteger p, BigInteger g) {
this.p = p;
this.g = g;
}
/**
* Returns the prime modulus <code>p</code>.
*
* @return the prime modulus <code>p</code>
*/
public BigInteger getP() {
return p;
}
/**
* Returns the base generator <code>g</code>.
*
* @return the base generator <code>g</code>
*/
public BigInteger getG() {
return g;
}
}

20
core/java/src/net/i2p/crypto/EncAlgo.java Normal file
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@@ -0,0 +1,20 @@
package net.i2p.crypto;
/**
* Base encryption algorithm type
*
* @since 0.9.18
*/
public enum EncAlgo {
ELGAMAL("ElGamal"),
EC("EC");
private final String name;
EncAlgo(String name) {
this.name = name;
}
public String getName() { return name; }
}

169
core/java/src/net/i2p/crypto/EncType.java Normal file
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@@ -0,0 +1,169 @@
package net.i2p.crypto;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidParameterSpecException;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import net.i2p.data.Hash;
import net.i2p.data.SimpleDataStructure;
/**
* Defines the properties for various signature types
* that I2P supports or may someday support.
*
* All Signatures, SigningPublicKeys, and SigningPrivateKeys have a type.
* Note that a EncType specifies both an algorithm and parameters, so that
* we may change primes or curves for a given algorithm.
*
* @since 0.9.18
*/
public enum EncType {
/**
* 2048-bit MODP Group from RFC 3526.
* This is the default.
* Pubkey 256 bytes, privkey 256 bytes.
*/
ELGAMAL_2048(0, 256, 256, EncAlgo.ELGAMAL, "ElGamal/None/NoPadding", CryptoConstants.ELGAMAL_2048_SPEC, "0"),
/** Pubkey 64 bytes; privkey 32 bytes; */
EC_P256(1, 64, 32, EncAlgo.EC, "EC/None/NoPadding", ECConstants.P256_SPEC, "0.9.20"),
/** Pubkey 96 bytes; privkey 48 bytes; */
EC_P384(2, 96, 48, EncAlgo.EC, "EC/None/NoPadding", ECConstants.P384_SPEC, "0.9.20"),
/** Pubkey 132 bytes; privkey 66 bytes; */
EC_P521(3, 132, 66, EncAlgo.EC, "EC/None/NoPadding", ECConstants.P521_SPEC, "0.9.20");
private final int code, pubkeyLen, privkeyLen;
private final EncAlgo base;
private final String algoName, since;
private final AlgorithmParameterSpec params;
private final boolean isAvail;
/**
*
* @param transformation algorithm/mode/padding
*
*/
EncType(int cod, int pubLen, int privLen, EncAlgo baseAlgo,
String transformation, AlgorithmParameterSpec pSpec, String supportedSince) {
code = cod;
pubkeyLen = pubLen;
privkeyLen = privLen;
base = baseAlgo;
algoName = transformation;
params = pSpec;
since = supportedSince;
isAvail = x_isAvailable();
}
/** the unique identifier for this type */
public int getCode() { return code; }
/** the length of the public key, in bytes */
public int getPubkeyLen() { return pubkeyLen; }
/** the length of the private key, in bytes */
public int getPrivkeyLen() { return privkeyLen; }
/** the standard base algorithm name used for the Java crypto factories */
public EncAlgo getBaseAlgorithm() { return base; }
/** the standard name used for the Java crypto factories */
public String getAlgorithmName() { return algoName; }
/**
* The elliptic curve ECParameterSpec for ECDSA; DSAParameterSpec for DSA
* @throws InvalidParameterSpecException if the algorithm is not available on this JVM.
*/
public AlgorithmParameterSpec getParams() throws InvalidParameterSpecException {
if (params == null)
throw new InvalidParameterSpecException(toString() + " is not available in this JVM");
return params;
}
/**
* The router version in which this type was first supported.
*/
public String getSupportedSince() {
return since;
}
/**
* @return true if supported in this JVM
*/
public boolean isAvailable() {
return isAvail;
}
private boolean x_isAvailable() {
if (ELGAMAL_2048 == this)
return true;
try {
getParams();
} catch (Exception e) {
return false;
}
return true;
}
/**
* @return true if supported in this JVM
*/
public static boolean isAvailable(int code) {
EncType type = getByCode(code);
if (type == null)
return false;
return type.isAvailable();
}
/**
* @param stype number or name
* @return true if supported in this JVM
*/
public static boolean isAvailable(String stype) {
EncType type = parseEncType(stype);
if (type == null)
return false;
return type.isAvailable();
}
private static final Map<Integer, EncType> BY_CODE = new HashMap<Integer, EncType>();
static {
for (EncType type : EncType.values()) {
if (BY_CODE.put(Integer.valueOf(type.getCode()), type) != null)
throw new IllegalStateException("Duplicate EncType code");
}
}
/** @return null if not supported */
public static EncType getByCode(int code) {
return BY_CODE.get(Integer.valueOf(code));
}
/**
* Convenience for user apps
*
* @param stype number or name
* @return null if not found
*/
public static EncType parseEncType(String stype) {
try {
String uc = stype.toUpperCase(Locale.US);
return valueOf(uc);
} catch (IllegalArgumentException iae) {
try {
int code = Integer.parseInt(stype);
return getByCode(code);
} catch (NumberFormatException nfe) {
return null;
}
}
}
}