org.xipki.security.util.AlgorithmUtil Maven / Gradle / Ivy
/*
*
* Copyright (c) 2013 - 2018 Lijun Liao
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.xipki.security.util;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.interfaces.DSAPublicKey;
import java.security.interfaces.ECPublicKey;
import java.security.interfaces.RSAPublicKey;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.bsi.BSIObjectIdentifiers;
import org.bouncycastle.asn1.gm.GMObjectIdentifiers;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.RSASSAPSSparams;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.jce.ECNamedCurveTable;
import org.xipki.security.AlgorithmCode;
import org.xipki.security.HashAlgo;
import org.xipki.security.SignatureAlgoControl;
import org.xipki.security.SignerConf;
import org.xipki.util.Args;
import org.xipki.util.StringUtil;
/**
* TODO.
* @author Lijun Liao
* @since 2.0.0
*/
public class AlgorithmUtil {
private static final List curveNames;
private static final Map curveNameToOidMap;
private static final Map curveOidToNameMap;
private static final Map algOidToCodeMap;
private static final Map sigAlgOidToDigestMap;
private static final Map macAlgOidToDigestMap;
private static final Map digestToECSigAlgMap;
private static final Map digestToECPlainSigAlgMap;
private static final Map digestToDSASigAlgMap;
private static final Map digestToRSASigAlgMap;
private static final Map macAlgOidToNameMap;
private static final Map macAlgNameToOidMap;
private static final Map sigAlgOidToNameMap;
private static final Map sigAlgNameToOidMap;
private static final Map digestToMgf1AlgCodeMap;
private static final Map digestOidToMgf1SigNameMap;
private static final Map mgf1SigNameToDigestOidMap;
static {
//----- initialize the static fields curveNames, curveNameOidMap, curveOidNameMap
{
List nameList = new LinkedList<>();
Map nameOidMap = new HashMap<>();
Map oidNameMap = new HashMap<>();
Enumeration names = ECNamedCurveTable.getNames();
while (names.hasMoreElements()) {
String name = ((String) names.nextElement()).toLowerCase();
ASN1ObjectIdentifier oid = org.bouncycastle.asn1.x9.ECNamedCurveTable.getOID(name);
if (oid == null) {
continue;
}
nameList.add(name);
nameOidMap.put(name, oid);
if (!oidNameMap.containsKey(oid)) {
oidNameMap.put(oid, name);
}
}
Collections.sort(nameList);
curveNames = Collections.unmodifiableList(nameList);
curveNameToOidMap = Collections.unmodifiableMap(nameOidMap);
curveOidToNameMap = Collections.unmodifiableMap(oidNameMap);
}
//----- Initialize the static fields algNameCodeMap
{
Map map = new HashMap<>();
// HMAC
map.put(PKCSObjectIdentifiers.id_hmacWithSHA1, AlgorithmCode.HMAC_SHA1);
map.put(PKCSObjectIdentifiers.id_hmacWithSHA224, AlgorithmCode.HMAC_SHA224);
map.put(PKCSObjectIdentifiers.id_hmacWithSHA256, AlgorithmCode.HMAC_SHA256);
map.put(PKCSObjectIdentifiers.id_hmacWithSHA384, AlgorithmCode.HMAC_SHA384);
map.put(PKCSObjectIdentifiers.id_hmacWithSHA512, AlgorithmCode.HMAC_SHA512);
map.put(NISTObjectIdentifiers.id_hmacWithSHA3_224, AlgorithmCode.HMAC_SHA224);
map.put(NISTObjectIdentifiers.id_hmacWithSHA3_256, AlgorithmCode.HMAC_SHA256);
map.put(NISTObjectIdentifiers.id_hmacWithSHA3_384, AlgorithmCode.HMAC_SHA384);
map.put(NISTObjectIdentifiers.id_hmacWithSHA3_512, AlgorithmCode.HMAC_SHA512);
// GMAC
map.put(NISTObjectIdentifiers.id_aes128_GCM, AlgorithmCode.AES128_GMAC);
map.put(NISTObjectIdentifiers.id_aes192_GCM, AlgorithmCode.AES192_GMAC);
map.put(NISTObjectIdentifiers.id_aes256_GCM, AlgorithmCode.AES256_GMAC);
// ECDSA
map.put(X9ObjectIdentifiers.ecdsa_with_SHA1, AlgorithmCode.SHA1WITHECDSA);
map.put(X9ObjectIdentifiers.ecdsa_with_SHA224, AlgorithmCode.SHA224WITHECDSA);
map.put(X9ObjectIdentifiers.ecdsa_with_SHA256, AlgorithmCode.SHA256WITHECDSA);
map.put(X9ObjectIdentifiers.ecdsa_with_SHA384, AlgorithmCode.SHA384WITHECDSA);
map.put(X9ObjectIdentifiers.ecdsa_with_SHA512, AlgorithmCode.SHA512WITHECDSA);
map.put(NISTObjectIdentifiers.id_ecdsa_with_sha3_224, AlgorithmCode.SHA3_224WITHECDSA);
map.put(NISTObjectIdentifiers.id_ecdsa_with_sha3_256, AlgorithmCode.SHA3_256WITHECDSA);
map.put(NISTObjectIdentifiers.id_ecdsa_with_sha3_384, AlgorithmCode.SHA3_384WITHECDSA);
map.put(NISTObjectIdentifiers.id_ecdsa_with_sha3_512, AlgorithmCode.SHA3_512WITHECDSA);
map.put(BSIObjectIdentifiers.ecdsa_plain_SHA1, AlgorithmCode.SHA1WITHPLAIN_ECDSA);
map.put(BSIObjectIdentifiers.ecdsa_plain_SHA224, AlgorithmCode.SHA224WITHPLAIN_ECDSA);
map.put(BSIObjectIdentifiers.ecdsa_plain_SHA256, AlgorithmCode.SHA256WITHPLAIN_ECDSA);
map.put(BSIObjectIdentifiers.ecdsa_plain_SHA384, AlgorithmCode.SHA384WITHPLAIN_ECDSA);
map.put(BSIObjectIdentifiers.ecdsa_plain_SHA512, AlgorithmCode.SHA512WITHPLAIN_ECDSA);
// DSA
map.put(X9ObjectIdentifiers.id_dsa_with_sha1, AlgorithmCode.SHA1WITHDSA);
map.put(NISTObjectIdentifiers.dsa_with_sha224, AlgorithmCode.SHA224WITHDSA);
map.put(NISTObjectIdentifiers.dsa_with_sha256, AlgorithmCode.SHA256WITHDSA);
map.put(NISTObjectIdentifiers.dsa_with_sha384, AlgorithmCode.SHA384WITHDSA);
map.put(NISTObjectIdentifiers.dsa_with_sha512, AlgorithmCode.SHA512WITHDSA);
map.put(NISTObjectIdentifiers.id_dsa_with_sha3_224, AlgorithmCode.SHA3_224WITHDSA);
map.put(NISTObjectIdentifiers.id_dsa_with_sha3_256, AlgorithmCode.SHA3_256WITHDSA);
map.put(NISTObjectIdentifiers.id_dsa_with_sha3_384, AlgorithmCode.SHA3_384WITHDSA);
map.put(NISTObjectIdentifiers.id_dsa_with_sha3_512, AlgorithmCode.SHA3_512WITHDSA);
// RSA
map.put(PKCSObjectIdentifiers.sha1WithRSAEncryption, AlgorithmCode.SHA1WITHRSA);
map.put(PKCSObjectIdentifiers.sha224WithRSAEncryption, AlgorithmCode.SHA224WITHRSA);
map.put(PKCSObjectIdentifiers.sha256WithRSAEncryption, AlgorithmCode.SHA256WITHRSA);
map.put(PKCSObjectIdentifiers.sha384WithRSAEncryption, AlgorithmCode.SHA384WITHRSA);
map.put(PKCSObjectIdentifiers.sha512WithRSAEncryption, AlgorithmCode.SHA512WITHRSA);
map.put(NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_224,
AlgorithmCode.SHA3_224WITHRSA);
map.put(NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_256,
AlgorithmCode.SHA3_256WITHRSA);
map.put(NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_384,
AlgorithmCode.SHA3_384WITHRSA);
map.put(NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_512,
AlgorithmCode.SHA3_512WITHRSA);
// SM2
map.put(GMObjectIdentifiers.sm2sign_with_sm3, AlgorithmCode.SM2WITHSM3);
// Hash
for (HashAlgo hashAlgo : HashAlgo.values()) {
map.put(hashAlgo.getOid(), hashAlgo.getAlgorithmCode());
}
algOidToCodeMap = Collections.unmodifiableMap(map);
}
//----- Initialize the static field digstMgf1AlgCodeMap
{
Map map = new HashMap<>();
map.put(HashAlgo.SHA1.getOid(), AlgorithmCode.SHA1WITHRSAANDMGF1);
map.put(HashAlgo.SHA224.getOid(), AlgorithmCode.SHA224WITHRSAANDMGF1);
map.put(HashAlgo.SHA256.getOid(), AlgorithmCode.SHA256WITHRSAANDMGF1);
map.put(HashAlgo.SHA384.getOid(), AlgorithmCode.SHA384WITHRSAANDMGF1);
map.put(HashAlgo.SHA512.getOid(), AlgorithmCode.SHA512WITHRSAANDMGF1);
map.put(HashAlgo.SHA3_224.getOid(), AlgorithmCode.SHA3_224WITHRSAANDMGF1);
map.put(HashAlgo.SHA3_256.getOid(), AlgorithmCode.SHA3_256WITHRSAANDMGF1);
map.put(HashAlgo.SHA3_384.getOid(), AlgorithmCode.SHA3_384WITHRSAANDMGF1);
map.put(HashAlgo.SHA3_512.getOid(), AlgorithmCode.SHA3_512WITHRSAANDMGF1);
digestToMgf1AlgCodeMap = Collections.unmodifiableMap(map);
}
//----- Initialize the static fields digestECSigAlgMap, digestECPlainSigAlgMap,
// digestDSASigAlgMap, digestRSASigAlgMap
{
// ECDSA
Map map = new HashMap<>();
map.put(HashAlgo.SHA1, X9ObjectIdentifiers.ecdsa_with_SHA1);
map.put(HashAlgo.SHA224, X9ObjectIdentifiers.ecdsa_with_SHA224);
map.put(HashAlgo.SHA256, X9ObjectIdentifiers.ecdsa_with_SHA256);
map.put(HashAlgo.SHA384, X9ObjectIdentifiers.ecdsa_with_SHA384);
map.put(HashAlgo.SHA512, X9ObjectIdentifiers.ecdsa_with_SHA512);
map.put(HashAlgo.SHA3_224, NISTObjectIdentifiers.id_ecdsa_with_sha3_224);
map.put(HashAlgo.SHA3_256, NISTObjectIdentifiers.id_ecdsa_with_sha3_256);
map.put(HashAlgo.SHA3_384, NISTObjectIdentifiers.id_ecdsa_with_sha3_384);
map.put(HashAlgo.SHA3_512, NISTObjectIdentifiers.id_ecdsa_with_sha3_512);
digestToECSigAlgMap = Collections.unmodifiableMap(map);
// PlainECDSA
map = new HashMap<>();
map.put(HashAlgo.SHA1, BSIObjectIdentifiers.ecdsa_plain_SHA1);
map.put(HashAlgo.SHA224, BSIObjectIdentifiers.ecdsa_plain_SHA224);
map.put(HashAlgo.SHA256, BSIObjectIdentifiers.ecdsa_plain_SHA256);
map.put(HashAlgo.SHA384, BSIObjectIdentifiers.ecdsa_plain_SHA384);
map.put(HashAlgo.SHA512, BSIObjectIdentifiers.ecdsa_plain_SHA512);
digestToECPlainSigAlgMap = Collections.unmodifiableMap(map);
// DSA
map = new HashMap<>();
map.put(HashAlgo.SHA1, X9ObjectIdentifiers.id_dsa_with_sha1);
map.put(HashAlgo.SHA224, NISTObjectIdentifiers.dsa_with_sha224);
map.put(HashAlgo.SHA256, NISTObjectIdentifiers.dsa_with_sha256);
map.put(HashAlgo.SHA384, NISTObjectIdentifiers.dsa_with_sha384);
map.put(HashAlgo.SHA512, NISTObjectIdentifiers.dsa_with_sha512);
map.put(HashAlgo.SHA3_224, NISTObjectIdentifiers.id_dsa_with_sha3_224);
map.put(HashAlgo.SHA3_256, NISTObjectIdentifiers.id_dsa_with_sha3_256);
map.put(HashAlgo.SHA3_384, NISTObjectIdentifiers.id_dsa_with_sha3_384);
map.put(HashAlgo.SHA3_512, NISTObjectIdentifiers.id_dsa_with_sha3_512);
digestToDSASigAlgMap = Collections.unmodifiableMap(map);
// RSA
map = new HashMap<>();
map.put(HashAlgo.SHA1, PKCSObjectIdentifiers.sha1WithRSAEncryption);
map.put(HashAlgo.SHA224, PKCSObjectIdentifiers.sha224WithRSAEncryption);
map.put(HashAlgo.SHA256, PKCSObjectIdentifiers.sha256WithRSAEncryption);
map.put(HashAlgo.SHA384, PKCSObjectIdentifiers.sha384WithRSAEncryption);
map.put(HashAlgo.SHA512, PKCSObjectIdentifiers.sha512WithRSAEncryption);
map.put(HashAlgo.SHA3_224, NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_224);
map.put(HashAlgo.SHA3_256, NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_256);
map.put(HashAlgo.SHA3_384, NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_384);
map.put(HashAlgo.SHA3_512, NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_512);
digestToRSASigAlgMap = Collections.unmodifiableMap(map);
}
//----- Initialize the static fields sigAlgOidDigestMap
{
Map map = new HashMap<>();
map.put(X9ObjectIdentifiers.ecdsa_with_SHA1, HashAlgo.SHA1);
map.put(X9ObjectIdentifiers.ecdsa_with_SHA224, HashAlgo.SHA224);
map.put(X9ObjectIdentifiers.ecdsa_with_SHA256, HashAlgo.SHA256);
map.put(X9ObjectIdentifiers.ecdsa_with_SHA384, HashAlgo.SHA384);
map.put(X9ObjectIdentifiers.ecdsa_with_SHA512, HashAlgo.SHA512);
map.put(NISTObjectIdentifiers.id_ecdsa_with_sha3_224, HashAlgo.SHA3_224);
map.put(NISTObjectIdentifiers.id_ecdsa_with_sha3_256, HashAlgo.SHA3_256);
map.put(NISTObjectIdentifiers.id_ecdsa_with_sha3_384, HashAlgo.SHA3_384);
map.put(NISTObjectIdentifiers.id_ecdsa_with_sha3_512, HashAlgo.SHA3_512);
map.put(BSIObjectIdentifiers.ecdsa_plain_SHA1, HashAlgo.SHA1);
map.put(BSIObjectIdentifiers.ecdsa_plain_SHA224, HashAlgo.SHA224);
map.put(BSIObjectIdentifiers.ecdsa_plain_SHA256, HashAlgo.SHA256);
map.put(BSIObjectIdentifiers.ecdsa_plain_SHA384, HashAlgo.SHA384);
map.put(BSIObjectIdentifiers.ecdsa_plain_SHA512, HashAlgo.SHA512);
map.put(X9ObjectIdentifiers.id_dsa_with_sha1, HashAlgo.SHA1);
map.put(NISTObjectIdentifiers.dsa_with_sha224, HashAlgo.SHA224);
map.put(NISTObjectIdentifiers.dsa_with_sha256, HashAlgo.SHA256);
map.put(NISTObjectIdentifiers.dsa_with_sha384, HashAlgo.SHA384);
map.put(NISTObjectIdentifiers.dsa_with_sha512, HashAlgo.SHA512);
map.put(NISTObjectIdentifiers.id_dsa_with_sha3_224, HashAlgo.SHA3_224);
map.put(NISTObjectIdentifiers.id_dsa_with_sha3_256, HashAlgo.SHA3_256);
map.put(NISTObjectIdentifiers.id_dsa_with_sha3_384, HashAlgo.SHA3_384);
map.put(NISTObjectIdentifiers.id_dsa_with_sha3_512, HashAlgo.SHA3_512);
map.put(PKCSObjectIdentifiers.sha1WithRSAEncryption, HashAlgo.SHA1);
map.put(PKCSObjectIdentifiers.sha224WithRSAEncryption, HashAlgo.SHA224);
map.put(PKCSObjectIdentifiers.sha256WithRSAEncryption, HashAlgo.SHA256);
map.put(PKCSObjectIdentifiers.sha384WithRSAEncryption, HashAlgo.SHA384);
map.put(PKCSObjectIdentifiers.sha512WithRSAEncryption, HashAlgo.SHA512);
map.put(NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_224, HashAlgo.SHA3_224);
map.put(NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_256, HashAlgo.SHA3_256);
map.put(NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_384, HashAlgo.SHA3_384);
map.put(NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_512, HashAlgo.SHA3_512);
map.put(GMObjectIdentifiers.sm2sign_with_sm3, HashAlgo.SM3);
sigAlgOidToDigestMap = Collections.unmodifiableMap(map);
}
//----- Initialize the static field macAlgOidDigestMap
{
Map map = new HashMap<>();
map.put(PKCSObjectIdentifiers.id_hmacWithSHA1, HashAlgo.SHA1);
map.put(PKCSObjectIdentifiers.id_hmacWithSHA224, HashAlgo.SHA224);
map.put(PKCSObjectIdentifiers.id_hmacWithSHA256, HashAlgo.SHA256);
map.put(PKCSObjectIdentifiers.id_hmacWithSHA384, HashAlgo.SHA384);
map.put(PKCSObjectIdentifiers.id_hmacWithSHA512, HashAlgo.SHA512);
map.put(NISTObjectIdentifiers.id_hmacWithSHA3_224, HashAlgo.SHA224);
map.put(NISTObjectIdentifiers.id_hmacWithSHA3_256, HashAlgo.SHA256);
map.put(NISTObjectIdentifiers.id_hmacWithSHA3_384, HashAlgo.SHA384);
map.put(NISTObjectIdentifiers.id_hmacWithSHA3_512, HashAlgo.SHA512);
macAlgOidToDigestMap = Collections.unmodifiableMap(map);
}
//----- Initialize the static field macAlgIdNameMap
{
Map m1 = new HashMap<>();
Map m2 = new HashMap<>();
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_aes128_GCM, "AES128GMAC");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_aes192_GCM, "AES192GMAC");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_aes256_GCM, "AES256GMAC");
addOidNameMap(m1, m2, PKCSObjectIdentifiers.id_hmacWithSHA1, "HMACSHA1");
addOidNameMap(m1, m2, PKCSObjectIdentifiers.id_hmacWithSHA224, "HMACSHA224");
addOidNameMap(m1, m2, PKCSObjectIdentifiers.id_hmacWithSHA256, "HMACSHA256");
addOidNameMap(m1, m2, PKCSObjectIdentifiers.id_hmacWithSHA384, "HMACSHA384");
addOidNameMap(m1, m2, PKCSObjectIdentifiers.id_hmacWithSHA512, "HMACSHA512");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_hmacWithSHA3_224, "HMACSHA3-224");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_hmacWithSHA3_256, "HMACSHA3-256");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_hmacWithSHA3_384, "HMACSHA3-384");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_hmacWithSHA3_512, "HMACSHA3-512");
macAlgOidToNameMap = Collections.unmodifiableMap(m1);
macAlgNameToOidMap = Collections.unmodifiableMap(m2);
}
//----- Initialize the static fields sigAlgOidNameMap, digestMgf1SigAlgNameMap.
{
Map m1 = new HashMap<>();
Map m2 = new HashMap<>();
addOidNameMap(m1, m2, X9ObjectIdentifiers.ecdsa_with_SHA1, "SHA1WITHECDSA",
"ECDSAWITHSHA1");
addOidNameMap(m1, m2, X9ObjectIdentifiers.ecdsa_with_SHA224, "SHA224WITHECDSA",
"ECDSAWITHSHA224");
addOidNameMap(m1, m2, X9ObjectIdentifiers.ecdsa_with_SHA256, "SHA256WITHECDSA",
"ECDSAWITHSHA256");
addOidNameMap(m1, m2, X9ObjectIdentifiers.ecdsa_with_SHA384, "SHA384WITHECDSA",
"ECDSAWITHSHA384");
addOidNameMap(m1, m2, X9ObjectIdentifiers.ecdsa_with_SHA512, "SHA512WITHECDSA",
"ECDSAWITHSHA512");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_ecdsa_with_sha3_224,
"SHA3-224WITHECDSA", "ECDSAWITHSHA3-224");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_ecdsa_with_sha3_256,
"SHA3-256WITHECDSA", "ECDSAWITHSHA3-256");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_ecdsa_with_sha3_384,
"SHA3-384WITHECDSA", "ECDSAWITHSHA3-384");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_ecdsa_with_sha3_512,
"SHA3-512WITHECDSA", "ECDSAWITHSHA3-512");
addOidNameMap(m1, m2, BSIObjectIdentifiers.ecdsa_plain_SHA1,
"SHA1WITHPLAINECDSA", "PLAINECDSAWITHSHA1");
addOidNameMap(m1, m2, BSIObjectIdentifiers.ecdsa_plain_SHA224,
"SHA224WITHPLAIN-ECDSA", "PLAINECDSAWITHSHA224");
addOidNameMap(m1, m2, BSIObjectIdentifiers.ecdsa_plain_SHA256,
"SHA256WITHPLAINECDSA", "PLAINECDSAWITHSHA256");
addOidNameMap(m1, m2, BSIObjectIdentifiers.ecdsa_plain_SHA384,
"SHA384WITHPLAINECDSA", "PLAINECDSAWITHSHA384");
addOidNameMap(m1, m2, BSIObjectIdentifiers.ecdsa_plain_SHA512,
"SHA512WITHPLAINECDSA", "PLAINECDSAWITHSHA512");
addOidNameMap(m1, m2, X9ObjectIdentifiers.id_dsa_with_sha1, "SHA1WITHDSA",
"DSAWITHSHA1");
addOidNameMap(m1, m2, NISTObjectIdentifiers.dsa_with_sha224, "SHA224WITHDSA",
"DSAWITHSHA224");
addOidNameMap(m1, m2, NISTObjectIdentifiers.dsa_with_sha256, "SHA256WITHDSA",
"DSAWITHSHA256");
addOidNameMap(m1, m2, NISTObjectIdentifiers.dsa_with_sha384, "SHA384WITHDSA",
"DSAWITHSHA384");
addOidNameMap(m1, m2, NISTObjectIdentifiers.dsa_with_sha512, "SHA512WITHDSA",
"DSAWITHSHA512");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_dsa_with_sha3_224, "SHA3-224WITHDSA",
"DSAWITHSHA3-224");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_dsa_with_sha3_256, "SHA3-256WITHDSA",
"DSAWITHSHA3-256");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_dsa_with_sha3_384, "SHA3-384WITHDSA",
"DSAWITHSHA3-384");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_dsa_with_sha3_512, "SHA3-512WITHDSA",
"DSAWITHSHA3-512");
addOidNameMap(m1, m2, PKCSObjectIdentifiers.sha1WithRSAEncryption, "SHA1WITHRSA",
"RSAWITHSHA1");
addOidNameMap(m1, m2, PKCSObjectIdentifiers.sha224WithRSAEncryption, "SHA224WITHRSA",
"RSAWITHSHA224");
addOidNameMap(m1, m2, PKCSObjectIdentifiers.sha256WithRSAEncryption, "SHA256WITHRSA",
"RSAWITHSHA256");
addOidNameMap(m1, m2, PKCSObjectIdentifiers.sha384WithRSAEncryption, "SHA384WITHRSA",
"RSAWITHSHA384");
addOidNameMap(m1, m2, PKCSObjectIdentifiers.sha512WithRSAEncryption, "SHA512WITHRSA",
"RSAWITHSHA512");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_224,
"SHA3-224WITHRSA", "RSAWITHSHA3-224");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_256,
"SHA3-256WITHRSA", "RSAWITHSHA3-256");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_384,
"SHA3-384WITHRSA", "RSAWITHSHA3-384");
addOidNameMap(m1, m2, NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_512,
"SHA3-512WITHRSA", "RSAWITHSHA3-512");
addOidNameMap(m1, m2, GMObjectIdentifiers.sm2sign_with_sm3, "SM3WITHSM2", "SM2WITHSM3");
sigAlgOidToNameMap = Collections.unmodifiableMap(m1);
sigAlgNameToOidMap = Collections.unmodifiableMap(m2);
m1 = new HashMap<>();
Map m3 = new HashMap<>();
addHashAlgoNameMap(m1, m3, HashAlgo.SHA1, "SHA1WITHRSAANDMGF1");
addHashAlgoNameMap(m1, m3, HashAlgo.SHA224, "SHA224WITHRSAANDMGF1");
addHashAlgoNameMap(m1, m3, HashAlgo.SHA256, "SHA256WITHRSAANDMGF1");
addHashAlgoNameMap(m1, m3, HashAlgo.SHA384, "SHA384WITHRSAANDMGF1");
addHashAlgoNameMap(m1, m3, HashAlgo.SHA512, "SHA512WITHRSAANDMGF1");
addHashAlgoNameMap(m1, m3, HashAlgo.SHA3_224, "SHA3-224WITHRSAANDMGF1");
addHashAlgoNameMap(m1, m3, HashAlgo.SHA3_256, "SHA3-256WITHRSAANDMGF1");
addHashAlgoNameMap(m1, m3, HashAlgo.SHA3_384, "SHA3-384WITHRSAANDMGF1");
addHashAlgoNameMap(m1, m3, HashAlgo.SHA3_512, "SHA3-512WITHRSAANDMGF1");
digestOidToMgf1SigNameMap = Collections.unmodifiableMap(m1);
mgf1SigNameToDigestOidMap = Collections.unmodifiableMap(m3);
}
}
private static void addOidNameMap(Map oidNameMap,
Map nameOidMap, ASN1ObjectIdentifier oid, String... names) {
oidNameMap.put(oid, names[0].toUpperCase());
nameOidMap.put(oid.getId(), oid);
for (String name : names) {
nameOidMap.put(name.toUpperCase(), oid);
}
}
private static void addHashAlgoNameMap(Map oidNameMap,
Map nameOidMap, HashAlgo hashAlgo, String... names) {
oidNameMap.put(hashAlgo.getOid(), names[0].toUpperCase());
nameOidMap.put(hashAlgo.getOid().getId(), hashAlgo);
for (String name : names) {
nameOidMap.put(name.toUpperCase(), hashAlgo);
}
}
private AlgorithmUtil() {
}
public static ASN1ObjectIdentifier getHashAlg(String hashAlgName)
throws NoSuchAlgorithmException {
Args.notBlank(hashAlgName, "hashAlgName");
HashAlgo hashAlgo = HashAlgo.getInstance(hashAlgName.toUpperCase());
if (hashAlgo == null) {
throw new NoSuchAlgorithmException("Unsupported hash algorithm " + hashAlgName);
}
return hashAlgo.getOid();
} // method getHashAlg
public static int getHashOutputSizeInOctets(ASN1ObjectIdentifier hashAlgo)
throws NoSuchAlgorithmException {
Args.notNull(hashAlgo, "hashAlgo");
HashAlgo hashAlgoType = HashAlgo.getInstance(hashAlgo);
if (hashAlgoType == null) {
throw new NoSuchAlgorithmException("Unsupported hash algorithm " + hashAlgo.getId());
}
return hashAlgoType.getLength();
} // method getHashOutputSizeInOctets
public static AlgorithmCode getSigOrMacAlgoCode(AlgorithmIdentifier algId)
throws NoSuchAlgorithmException {
ASN1ObjectIdentifier oid = algId.getAlgorithm();
AlgorithmCode code = algOidToCodeMap.get(oid);
if (code != null) {
return code;
}
if (PKCSObjectIdentifiers.id_RSASSA_PSS.equals(oid)) {
RSASSAPSSparams param = RSASSAPSSparams.getInstance(algId.getParameters());
ASN1ObjectIdentifier digestAlgOid = param.getHashAlgorithm().getAlgorithm();
code = digestToMgf1AlgCodeMap.get(digestAlgOid);
if (code == null) {
throw new NoSuchAlgorithmException("unsupported digest algorithm " + digestAlgOid);
}
return code;
} else {
throw new NoSuchAlgorithmException("unsupported signature algorithm " + oid.getId());
}
} // method getSignatureAlgoName
public static String getSigOrMacAlgoName(AlgorithmIdentifier sigAlgId)
throws NoSuchAlgorithmException {
ASN1ObjectIdentifier algOid = Args.notNull(sigAlgId, "sigAlgId").getAlgorithm();
String name = macAlgOidToNameMap.get(algOid);
return (name != null) ? name : getSignatureAlgoName(sigAlgId);
}
public static String getSignatureAlgoName(AlgorithmIdentifier sigAlgId)
throws NoSuchAlgorithmException {
ASN1ObjectIdentifier algOid = Args.notNull(sigAlgId, "sigAlgId").getAlgorithm();
String name = null;
if (PKCSObjectIdentifiers.id_RSASSA_PSS.equals(algOid)) {
RSASSAPSSparams param = RSASSAPSSparams.getInstance(sigAlgId.getParameters());
ASN1ObjectIdentifier digestAlgOid = param.getHashAlgorithm().getAlgorithm();
name = digestOidToMgf1SigNameMap.get(digestAlgOid);
if (name == null) {
throw new NoSuchAlgorithmException("unsupported digest algorithm " + digestAlgOid);
}
} else {
name = sigAlgOidToNameMap.get(algOid);
}
if (name == null) {
throw new NoSuchAlgorithmException("unsupported signature algorithm " + algOid.getId());
}
return name;
} // method getSignatureAlgoName
// CHECKSTYLE:SKIP
public static boolean isDSAPlainSigAlg(AlgorithmIdentifier algId) {
return isPlainECDSASigAlg(algId);
}
public static String canonicalizeSignatureAlgo(String algoName) throws NoSuchAlgorithmException {
return getSignatureAlgoName(getSigAlgId(algoName));
}
public static AlgorithmIdentifier getMacAlgId(String macAlgName) throws NoSuchAlgorithmException {
String algoS = Args.notNull(macAlgName, "macAlgName").toUpperCase();
algoS = canonicalizeAlgoText(algoS);
ASN1ObjectIdentifier oid = macAlgNameToOidMap.get(algoS);
if (oid == null) {
throw new NoSuchAlgorithmException("unsupported MAC algorithm " + algoS);
}
return new AlgorithmIdentifier(oid, DERNull.INSTANCE);
} // method getMacAlgId
public static AlgorithmIdentifier getSigAlgId(String sigAlgName) throws NoSuchAlgorithmException {
String algoS = Args.notNull(sigAlgName, "sigAlgName").toUpperCase();
algoS = canonicalizeAlgoText(algoS);
AlgorithmIdentifier signatureAlgId;
if (algoS.contains("MGF1")) {
HashAlgo ha = mgf1SigNameToDigestOidMap.get(algoS);
if (ha == null) {
throw new NoSuchAlgorithmException("unknown algorithm " + algoS);
}
signatureAlgId = buildRSAPSSAlgId(ha);
} else {
ASN1ObjectIdentifier algOid = sigAlgNameToOidMap.get(algoS);
if (algOid == null) {
throw new NoSuchAlgorithmException("unknown algorithm " + algoS);
}
boolean withNullParam = algoS.contains("RSA");
signatureAlgId = withNullParam ? new AlgorithmIdentifier(algOid, DERNull.INSTANCE)
: new AlgorithmIdentifier(algOid);
}
return signatureAlgId;
} // method getSigAlgId
public static AlgorithmIdentifier getSigAlgId(PublicKey pubKey, SignerConf signerConf)
throws NoSuchAlgorithmException {
if (Args.notNull(signerConf, "signerConf").getHashAlgo() == null) {
return getSigAlgId(signerConf.getConfValue("algo"));
} else {
SignatureAlgoControl algoControl = signerConf.getSignatureAlgoControl();
HashAlgo hashAlgo = signerConf.getHashAlgo();
if (pubKey instanceof RSAPublicKey) {
boolean rsaMgf1 = (algoControl == null) ? false : algoControl.isRsaMgf1();
return getRSASigAlgId(hashAlgo, rsaMgf1);
} else if (pubKey instanceof ECPublicKey) {
boolean dsaPlain = (algoControl == null) ? false : algoControl.isDsaPlain();
boolean gm = (algoControl == null) ? false : algoControl.isGm();
return getECSigAlgId(hashAlgo, dsaPlain, gm);
} else if (pubKey instanceof DSAPublicKey) {
return getDSASigAlgId(hashAlgo);
} else {
throw new NoSuchAlgorithmException("Unknown public key '" + pubKey.getClass().getName());
}
}
}
public static AlgorithmIdentifier getSigAlgId(PublicKey pubKey, HashAlgo hashAlgo,
SignatureAlgoControl algoControl) throws NoSuchAlgorithmException {
Args.notNull(hashAlgo, "hashAlgo");
if (pubKey instanceof RSAPublicKey) {
boolean rsaMgf1 = (algoControl == null) ? false : algoControl.isRsaMgf1();
return getRSASigAlgId(hashAlgo, rsaMgf1);
} else if (pubKey instanceof ECPublicKey) {
boolean dsaPlain = (algoControl == null) ? false : algoControl.isDsaPlain();
boolean gm = (algoControl == null) ? false : algoControl.isGm();
return getECSigAlgId(hashAlgo, dsaPlain, gm);
} else if (pubKey instanceof DSAPublicKey) {
return getDSASigAlgId(hashAlgo);
} else {
throw new NoSuchAlgorithmException("Unknown public key '" + pubKey.getClass().getName());
}
}
// CHECKSTYLE:SKIP
public static boolean isRSASigAlgId(AlgorithmIdentifier algId) {
ASN1ObjectIdentifier oid = Args.notNull(algId, "algId").getAlgorithm();
if (PKCSObjectIdentifiers.sha1WithRSAEncryption.equals(oid)
|| PKCSObjectIdentifiers.sha224WithRSAEncryption.equals(oid)
|| PKCSObjectIdentifiers.sha256WithRSAEncryption.equals(oid)
|| PKCSObjectIdentifiers.sha384WithRSAEncryption.equals(oid)
|| PKCSObjectIdentifiers.sha512WithRSAEncryption.equals(oid)
|| NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_224.equals(oid)
|| NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_256.equals(oid)
|| NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_384.equals(oid)
|| NISTObjectIdentifiers.id_rsassa_pkcs1_v1_5_with_sha3_512.equals(oid)
|| PKCSObjectIdentifiers.id_RSASSA_PSS.equals(oid)) {
return true;
}
return false;
}
// CHECKSTYLE:SKIP
public static boolean isECSigAlg(AlgorithmIdentifier algId) {
return isECDSASigAlg(algId) || isPlainECDSASigAlg(algId);
}
// CHECKSTYLE:SKIP
private static boolean isECDSASigAlg(AlgorithmIdentifier algId) {
ASN1ObjectIdentifier oid = Args.notNull(algId, "algId").getAlgorithm();
if (X9ObjectIdentifiers.ecdsa_with_SHA1.equals(oid)
|| X9ObjectIdentifiers.ecdsa_with_SHA224.equals(oid)
|| X9ObjectIdentifiers.ecdsa_with_SHA256.equals(oid)
|| X9ObjectIdentifiers.ecdsa_with_SHA384.equals(oid)
|| X9ObjectIdentifiers.ecdsa_with_SHA512.equals(oid)
|| NISTObjectIdentifiers.id_ecdsa_with_sha3_224.equals(oid)
|| NISTObjectIdentifiers.id_ecdsa_with_sha3_256.equals(oid)
|| NISTObjectIdentifiers.id_ecdsa_with_sha3_384.equals(oid)
|| NISTObjectIdentifiers.id_ecdsa_with_sha3_512.equals(oid)) {
return true;
}
return false;
}
// CHECKSTYLE:SKIP
public static boolean isPlainECDSASigAlg(AlgorithmIdentifier algId) {
ASN1ObjectIdentifier oid = Args.notNull(algId, "algId").getAlgorithm();
if (BSIObjectIdentifiers.ecdsa_plain_SHA1.equals(oid)
|| BSIObjectIdentifiers.ecdsa_plain_SHA224.equals(oid)
|| BSIObjectIdentifiers.ecdsa_plain_SHA256.equals(oid)
|| BSIObjectIdentifiers.ecdsa_plain_SHA384.equals(oid)
|| BSIObjectIdentifiers.ecdsa_plain_SHA512.equals(oid)) {
return true;
}
return false;
}
// CHECKSTYLE:SKIP
public static boolean isSM2SigAlg(AlgorithmIdentifier algId) {
ASN1ObjectIdentifier oid = Args.notNull(algId, "algId").getAlgorithm();
if (GMObjectIdentifiers.sm2sign_with_sm3.equals(oid)) {
return true;
}
// other algorithms not supported yet.
return false;
}
// CHECKSTYLE:SKIP
public static boolean isDSASigAlg(AlgorithmIdentifier algId) {
ASN1ObjectIdentifier oid = Args.notNull(algId, "algId").getAlgorithm();
if (X9ObjectIdentifiers.id_dsa_with_sha1.equals(oid)
|| NISTObjectIdentifiers.dsa_with_sha224.equals(oid)
|| NISTObjectIdentifiers.dsa_with_sha256.equals(oid)
|| NISTObjectIdentifiers.dsa_with_sha384.equals(oid)
|| NISTObjectIdentifiers.dsa_with_sha512.equals(oid)
|| NISTObjectIdentifiers.id_dsa_with_sha3_224.equals(oid)
|| NISTObjectIdentifiers.id_dsa_with_sha3_256.equals(oid)
|| NISTObjectIdentifiers.id_dsa_with_sha3_384.equals(oid)
|| NISTObjectIdentifiers.id_dsa_with_sha3_512.equals(oid)) {
return true;
}
return false;
}
// CHECKSTYLE:SKIP
private static AlgorithmIdentifier getRSASigAlgId(HashAlgo hashAlgo, boolean mgf1)
throws NoSuchAlgorithmException {
Args.notNull(hashAlgo, "hashAlgo");
if (mgf1) {
return buildRSAPSSAlgId(hashAlgo);
}
ASN1ObjectIdentifier sigAlgOid = digestToRSASigAlgMap.get(hashAlgo);
if (sigAlgOid == null) {
throw new NoSuchAlgorithmException("unsupported hash " + hashAlgo + " for RSA key");
}
return new AlgorithmIdentifier(sigAlgOid, DERNull.INSTANCE);
} // method getRSASigAlgId
// CHECKSTYLE:SKIP
private static AlgorithmIdentifier getDSASigAlgId(HashAlgo hashAlgo)
throws NoSuchAlgorithmException {
Args.notNull(hashAlgo, "hashAlgo");
ASN1ObjectIdentifier sigAlgOid = digestToDSASigAlgMap.get(hashAlgo);
if (sigAlgOid == null) {
throw new NoSuchAlgorithmException("unsupported hash " + hashAlgo + " for DSA key");
}
return new AlgorithmIdentifier(sigAlgOid);
} // method getDSASigAlgId
// CHECKSTYLE:SKIP
private static AlgorithmIdentifier getECSigAlgId(HashAlgo hashAlgo, boolean plainSignature,
boolean gm) throws NoSuchAlgorithmException {
Args.notNull(hashAlgo, "hashAlgo");
if (gm && plainSignature) {
throw new IllegalArgumentException("plainSignature and gm cannot be both true");
}
ASN1ObjectIdentifier sigAlgOid;
if (gm) {
switch (hashAlgo) {
case SM3:
sigAlgOid = GMObjectIdentifiers.sm2sign_with_sm3;
break;
default:
throw new NoSuchAlgorithmException("unsupported hash " + hashAlgo + " for SM2 EC key");
}
} else if (plainSignature) {
sigAlgOid = digestToECPlainSigAlgMap.get(hashAlgo);
if (sigAlgOid == null) {
throw new NoSuchAlgorithmException("unsupported hash " + hashAlgo + " for SM2 EC key");
}
} else {
sigAlgOid = digestToECSigAlgMap.get(hashAlgo);
if (sigAlgOid == null) {
throw new NoSuchAlgorithmException("unsupported hash " + hashAlgo + " for EC key");
}
}
return new AlgorithmIdentifier(sigAlgOid);
} // method getECDSASigAlgId
public static HashAlgo extractHashAlgoFromMacAlg(AlgorithmIdentifier macAlg) {
ASN1ObjectIdentifier oid = macAlg.getAlgorithm();
HashAlgo hashAlgo = macAlgOidToDigestMap.get(oid);
if (hashAlgo == null) {
throw new IllegalArgumentException("unknown algorithm identifier " + oid.getId());
}
return hashAlgo;
}
public static AlgorithmIdentifier extractDigesetAlgFromSigAlg(AlgorithmIdentifier sigAlgId)
throws NoSuchAlgorithmException {
ASN1ObjectIdentifier algOid = sigAlgId.getAlgorithm();
ASN1ObjectIdentifier digestAlgOid;
if (PKCSObjectIdentifiers.id_RSASSA_PSS.equals(algOid)) {
ASN1Encodable asn1Encodable = sigAlgId.getParameters();
RSASSAPSSparams param = RSASSAPSSparams.getInstance(asn1Encodable);
digestAlgOid = param.getHashAlgorithm().getAlgorithm();
} else {
HashAlgo digestAlg = sigAlgOidToDigestMap.get(algOid);
if (digestAlg == null) {
throw new NoSuchAlgorithmException("unknown signature algorithm " + algOid.getId());
}
digestAlgOid = digestAlg.getOid();
}
return new AlgorithmIdentifier(digestAlgOid, DERNull.INSTANCE);
} // method extractDigesetAlgorithmIdentifier
public static boolean equalsAlgoName(String algoNameA, String algoNameB) {
Args.notBlank(algoNameA, "algoNameA");
Args.notBlank(algoNameB, "algoNameB");
if (algoNameA.equalsIgnoreCase(algoNameB)) {
return true;
}
String tmpA = algoNameA;
if (tmpA.indexOf('-') != -1) {
tmpA = tmpA.replace("-", "");
}
String tmpB = algoNameB;
if (tmpB.indexOf('-') != -1) {
tmpB = tmpB.replace("-", "");
}
if (tmpA.equalsIgnoreCase(tmpB)) {
return true;
}
return splitAlgoNameTokens(tmpA).equals(splitAlgoNameTokens(tmpB));
}
private static Set splitAlgoNameTokens(String algoName) {
Args.notBlank(algoName, "algoName");
String tmpAlgoName = algoName.toUpperCase();
int idx = tmpAlgoName.indexOf("AND");
Set set = new HashSet<>();
if (idx == -1) {
set.add(tmpAlgoName);
return set;
}
final int len = tmpAlgoName.length();
int beginIndex = 0;
int endIndex = idx;
while (true) {
String token = tmpAlgoName.substring(beginIndex, endIndex);
if (StringUtil.isNotBlank(token)) {
set.add(token);
}
if (endIndex >= len) {
return set;
}
beginIndex = endIndex + 3; // 3 = "AND".length()
endIndex = tmpAlgoName.indexOf("AND", beginIndex);
if (endIndex == -1) {
endIndex = len;
}
}
}
// CHECKSTYLE:SKIP
private static AlgorithmIdentifier buildRSAPSSAlgId(HashAlgo digestAlg)
throws NoSuchAlgorithmException {
RSASSAPSSparams params = createPSSRSAParams(digestAlg);
return new AlgorithmIdentifier(PKCSObjectIdentifiers.id_RSASSA_PSS, params);
}
// CHECKSTYLE:SKIP
private static RSASSAPSSparams createPSSRSAParams(HashAlgo digestAlg)
throws NoSuchAlgorithmException {
int saltSize = Args.notNull(digestAlg, "digestAlg").getLength();
AlgorithmIdentifier digAlgId = new AlgorithmIdentifier(digestAlg.getOid(), DERNull.INSTANCE);
return new RSASSAPSSparams(digAlgId,
new AlgorithmIdentifier(PKCSObjectIdentifiers.id_mgf1, digAlgId),
new ASN1Integer(saltSize), RSASSAPSSparams.DEFAULT_TRAILER_FIELD);
} // method createPSSRSAParams
private static ASN1ObjectIdentifier getCurveOidForName(String curveName) {
return curveNameToOidMap.get(Args.toNonBlankLower(curveName, "curveName"));
}
// CHECKSTYLE:SKIP
public static List getECCurveNames() {
return curveNames;
}
public static String getCurveName(ASN1ObjectIdentifier curveOid) {
Args.notNull(curveOid, "curveOid");
return curveOidToNameMap.get(curveOid);
}
public static ASN1ObjectIdentifier getCurveOidForCurveNameOrOid(String curveNameOrOid) {
Args.notBlank(curveNameOrOid, "curveNameOrOid");
ASN1ObjectIdentifier oid;
try {
oid = new ASN1ObjectIdentifier(curveNameOrOid);
} catch (Exception ex) {
oid = getCurveOidForName(curveNameOrOid);
}
return oid;
}
private static String canonicalizeAlgoText(String algoText) {
if (algoText.indexOf('-') == -1) {
return algoText;
}
StringBuilder sb = new StringBuilder(algoText.length());
for (int i = 0; i < algoText.length(); i++) {
char cc = algoText.charAt(i);
if (cc == '-') {
if (i > 3 && !(algoText.charAt(i - 4) == 'S' && algoText.charAt(i - 3) == 'H'
&& algoText.charAt(i - 2) == 'A' && algoText.charAt(i - 1) == '3')) {
continue;
}
}
sb.append(cc);
}
return sb.toString();
}
}
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