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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.
package org.bouncycastle.jcajce.provider.asymmetric.util;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import javax.crypto.KeyAgreementSpi;
import javax.crypto.SecretKey;
import javax.crypto.ShortBufferException;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cryptopro.CryptoProObjectIdentifiers;
import org.bouncycastle.asn1.gnu.GNUObjectIdentifiers;
import org.bouncycastle.asn1.kisa.KISAObjectIdentifiers;
import org.bouncycastle.asn1.misc.MiscObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.ntt.NTTObjectIdentifiers;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.crypto.DerivationFunction;
import org.bouncycastle.crypto.agreement.kdf.DHKDFParameters;
import org.bouncycastle.crypto.agreement.kdf.DHKEKGenerator;
import org.bouncycastle.crypto.params.DESParameters;
import org.bouncycastle.crypto.params.KDFParameters;
import org.bouncycastle.util.Integers;
import org.bouncycastle.util.Strings;
public abstract class BaseAgreementSpi
extends KeyAgreementSpi
{
private static final Map defaultOids = new HashMap ();
private static final Map keySizes = new HashMap ();
private static final Map nameTable = new HashMap ();
private static final Hashtable oids = new Hashtable();
private static final Hashtable des = new Hashtable();
static
{
Integer i64 = Integers.valueOf(64);
Integer i128 = Integers.valueOf(128);
Integer i192 = Integers.valueOf(192);
Integer i256 = Integers.valueOf(256);
keySizes.put("DES", i64);
keySizes.put("DESEDE", i192);
keySizes.put("BLOWFISH", i128);
keySizes.put("AES", i256);
keySizes.put(NISTObjectIdentifiers.id_aes128_ECB.getId(), i128);
keySizes.put(NISTObjectIdentifiers.id_aes192_ECB.getId(), i192);
keySizes.put(NISTObjectIdentifiers.id_aes256_ECB.getId(), i256);
keySizes.put(NISTObjectIdentifiers.id_aes128_CBC.getId(), i128);
keySizes.put(NISTObjectIdentifiers.id_aes192_CBC.getId(), i192);
keySizes.put(NISTObjectIdentifiers.id_aes256_CBC.getId(), i256);
keySizes.put(NISTObjectIdentifiers.id_aes128_CFB.getId(), i128);
keySizes.put(NISTObjectIdentifiers.id_aes192_CFB.getId(), i192);
keySizes.put(NISTObjectIdentifiers.id_aes256_CFB.getId(), i256);
keySizes.put(NISTObjectIdentifiers.id_aes128_OFB.getId(), i128);
keySizes.put(NISTObjectIdentifiers.id_aes192_OFB.getId(), i192);
keySizes.put(NISTObjectIdentifiers.id_aes256_OFB.getId(), i256);
keySizes.put(NISTObjectIdentifiers.id_aes128_wrap.getId(), i128);
keySizes.put(NISTObjectIdentifiers.id_aes192_wrap.getId(), i192);
keySizes.put(NISTObjectIdentifiers.id_aes256_wrap.getId(), i256);
keySizes.put(NISTObjectIdentifiers.id_aes128_CCM.getId(), i128);
keySizes.put(NISTObjectIdentifiers.id_aes192_CCM.getId(), i192);
keySizes.put(NISTObjectIdentifiers.id_aes256_CCM.getId(), i256);
keySizes.put(NISTObjectIdentifiers.id_aes128_GCM.getId(), i128);
keySizes.put(NISTObjectIdentifiers.id_aes192_GCM.getId(), i192);
keySizes.put(NISTObjectIdentifiers.id_aes256_GCM.getId(), i256);
keySizes.put(NTTObjectIdentifiers.id_camellia128_wrap.getId(), i128);
keySizes.put(NTTObjectIdentifiers.id_camellia192_wrap.getId(), i192);
keySizes.put(NTTObjectIdentifiers.id_camellia256_wrap.getId(), i256);
keySizes.put(KISAObjectIdentifiers.id_npki_app_cmsSeed_wrap.getId(), i128);
keySizes.put(PKCSObjectIdentifiers.id_alg_CMS3DESwrap.getId(), i192);
keySizes.put(PKCSObjectIdentifiers.des_EDE3_CBC.getId(), i192);
keySizes.put(OIWObjectIdentifiers.desCBC.getId(), i64);
keySizes.put(PKCSObjectIdentifiers.id_hmacWithSHA1.getId(), Integers.valueOf(160));
keySizes.put(PKCSObjectIdentifiers.id_hmacWithSHA256.getId(), i256);
keySizes.put(PKCSObjectIdentifiers.id_hmacWithSHA384.getId(), Integers.valueOf(384));
keySizes.put(PKCSObjectIdentifiers.id_hmacWithSHA512.getId(), Integers.valueOf(512));
defaultOids.put("DESEDE", PKCSObjectIdentifiers.des_EDE3_CBC);
defaultOids.put("AES", NISTObjectIdentifiers.id_aes256_CBC);
defaultOids.put("CAMELLIA", NTTObjectIdentifiers.id_camellia256_cbc);
defaultOids.put("SEED", KISAObjectIdentifiers.id_seedCBC);
defaultOids.put("DES", OIWObjectIdentifiers.desCBC);
nameTable.put(MiscObjectIdentifiers.cast5CBC.getId(), "CAST5");
nameTable.put(MiscObjectIdentifiers.as_sys_sec_alg_ideaCBC.getId(), "IDEA");
nameTable.put(MiscObjectIdentifiers.cryptlib_algorithm_blowfish_ECB.getId(), "Blowfish");
nameTable.put(MiscObjectIdentifiers.cryptlib_algorithm_blowfish_CBC.getId(), "Blowfish");
nameTable.put(MiscObjectIdentifiers.cryptlib_algorithm_blowfish_CFB.getId(), "Blowfish");
nameTable.put(MiscObjectIdentifiers.cryptlib_algorithm_blowfish_OFB.getId(), "Blowfish");
nameTable.put(OIWObjectIdentifiers.desECB.getId(), "DES");
nameTable.put(OIWObjectIdentifiers.desCBC.getId(), "DES");
nameTable.put(OIWObjectIdentifiers.desCFB.getId(), "DES");
nameTable.put(OIWObjectIdentifiers.desOFB.getId(), "DES");
nameTable.put(OIWObjectIdentifiers.desEDE.getId(), "DESede");
nameTable.put(PKCSObjectIdentifiers.des_EDE3_CBC.getId(), "DESede");
nameTable.put(PKCSObjectIdentifiers.id_alg_CMS3DESwrap.getId(), "DESede");
nameTable.put(PKCSObjectIdentifiers.id_alg_CMSRC2wrap.getId(), "RC2");
nameTable.put(PKCSObjectIdentifiers.id_hmacWithSHA1.getId(), "HmacSHA1");
nameTable.put(PKCSObjectIdentifiers.id_hmacWithSHA224.getId(), "HmacSHA224");
nameTable.put(PKCSObjectIdentifiers.id_hmacWithSHA256.getId(), "HmacSHA256");
nameTable.put(PKCSObjectIdentifiers.id_hmacWithSHA384.getId(), "HmacSHA384");
nameTable.put(PKCSObjectIdentifiers.id_hmacWithSHA512.getId(), "HmacSHA512");
nameTable.put(NTTObjectIdentifiers.id_camellia128_cbc.getId(), "Camellia");
nameTable.put(NTTObjectIdentifiers.id_camellia192_cbc.getId(), "Camellia");
nameTable.put(NTTObjectIdentifiers.id_camellia256_cbc.getId(), "Camellia");
nameTable.put(NTTObjectIdentifiers.id_camellia128_wrap.getId(), "Camellia");
nameTable.put(NTTObjectIdentifiers.id_camellia192_wrap.getId(), "Camellia");
nameTable.put(NTTObjectIdentifiers.id_camellia256_wrap.getId(), "Camellia");
nameTable.put(KISAObjectIdentifiers.id_npki_app_cmsSeed_wrap.getId(), "SEED");
nameTable.put(KISAObjectIdentifiers.id_seedCBC.getId(), "SEED");
nameTable.put(KISAObjectIdentifiers.id_seedMAC.getId(), "SEED");
nameTable.put(CryptoProObjectIdentifiers.gostR28147_gcfb.getId(), "GOST28147");
nameTable.put(NISTObjectIdentifiers.id_aes128_wrap.getId(), "AES");
nameTable.put(NISTObjectIdentifiers.id_aes128_CCM.getId(), "AES");
nameTable.put(NISTObjectIdentifiers.id_aes128_CCM.getId(), "AES");
oids.put("DESEDE", PKCSObjectIdentifiers.des_EDE3_CBC);
oids.put("AES", NISTObjectIdentifiers.id_aes256_CBC);
oids.put("DES", OIWObjectIdentifiers.desCBC);
des.put("DES", "DES");
des.put("DESEDE", "DES");
des.put(OIWObjectIdentifiers.desCBC.getId(), "DES");
des.put(PKCSObjectIdentifiers.des_EDE3_CBC.getId(), "DES");
des.put(PKCSObjectIdentifiers.id_alg_CMS3DESwrap.getId(), "DES");
}
private final String kaAlgorithm;
private final DerivationFunction kdf;
protected byte[] ukmParameters;
public BaseAgreementSpi(String kaAlgorithm, DerivationFunction kdf)
{
this.kaAlgorithm = kaAlgorithm;
this.kdf = kdf;
}
protected static String getAlgorithm(String algDetails)
{
if (algDetails.indexOf('[') > 0)
{
return algDetails.substring(0, algDetails.indexOf('['));
}
if (algDetails.startsWith(NISTObjectIdentifiers.aes.getId()))
{
return "AES";
}
if (algDetails.startsWith(GNUObjectIdentifiers.Serpent.getId()))
{
return "Serpent";
}
String name = (String)nameTable.get(Strings.toUpperCase(algDetails));
if (name != null)
{
return name;
}
return algDetails;
}
protected static int getKeySize(String algDetails)
{
if (algDetails.indexOf('[') > 0)
{
return (Integer.parseInt(algDetails.substring(algDetails.indexOf('[') + 1, algDetails.indexOf(']'))) + 7) / 8;
}
String algKey = Strings.toUpperCase(algDetails);
if (!keySizes.containsKey(algKey))
{
return -1;
}
return ((Integer)keySizes.get(algKey)).intValue();
}
protected static byte[] trimZeroes(byte[] secret)
{
if (secret[0] != 0)
{
return secret;
}
else
{
int ind = 0;
while (ind < secret.length && secret[ind] == 0)
{
ind++;
}
byte[] rv = new byte[secret.length - ind];
System.arraycopy(secret, ind, rv, 0, rv.length);
return rv;
}
}
protected byte[] engineGenerateSecret()
throws IllegalStateException
{
if (kdf != null)
{
throw new UnsupportedOperationException(
"KDF can only be used when algorithm is known");
}
return calcSecret();
}
protected int engineGenerateSecret(
byte[] sharedSecret,
int offset)
throws IllegalStateException, ShortBufferException
{
byte[] secret = engineGenerateSecret();
if (sharedSecret.length - offset < secret.length)
{
throw new ShortBufferException(kaAlgorithm + " key agreement: need " + secret.length + " bytes");
}
System.arraycopy(secret, 0, sharedSecret, offset, secret.length);
return secret.length;
}
protected SecretKey engineGenerateSecret(
String algorithm)
throws NoSuchAlgorithmException
{
byte[] secret = calcSecret();
String algKey = Strings.toUpperCase(algorithm);
String oidAlgorithm = algorithm;
if (oids.containsKey(algKey))
{
oidAlgorithm = ((ASN1ObjectIdentifier)oids.get(algKey)).getId();
}
int keySize = getKeySize(oidAlgorithm);
if (kdf != null)
{
if (keySize < 0)
{
throw new NoSuchAlgorithmException("unknown algorithm encountered: " + oidAlgorithm);
}
byte[] keyBytes = new byte[keySize / 8];
if (kdf instanceof DHKEKGenerator)
{
ASN1ObjectIdentifier oid;
try
{
oid = new ASN1ObjectIdentifier(oidAlgorithm);
}
catch (IllegalArgumentException e)
{
throw new NoSuchAlgorithmException("no OID for algorithm: " + oidAlgorithm);
}
DHKDFParameters params = new DHKDFParameters(oid, keySize, secret, ukmParameters);
kdf.init(params);
}
else
{
KDFParameters params = new KDFParameters(secret, ukmParameters);
kdf.init(params);
}
kdf.generateBytes(keyBytes, 0, keyBytes.length);
secret = keyBytes;
}
else
{
if (keySize > 0)
{
byte[] keyBytes = new byte[keySize / 8];
System.arraycopy(secret, 0, keyBytes, 0, keyBytes.length);
secret = keyBytes;
}
}
if (des.containsKey(oidAlgorithm))
{
DESParameters.setOddParity(secret);
}
return new SecretKeySpec(secret, getAlgorithm(algorithm));
}
protected abstract byte[] calcSecret();
}
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