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Dahua ICC Open API SDK for Java
package com.dahuatech.hutool.crypto;
import com.dahuatech.hutool.core.io.FileUtil;
import com.dahuatech.hutool.core.lang.Assert;
import com.dahuatech.hutool.core.util.*;
import com.dahuatech.hutool.crypto.asymmetric.AsymmetricAlgorithm;
import com.dahuatech.hutool.crypto.symmetric.SymmetricAlgorithm;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.InputStream;
import java.security.*;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.spec.*;
/**
* 密钥工具类
*
* 包括:
*
*
* 1、生成密钥（单密钥、密钥对）
* 2、读取密钥文件
*
*
* @author looly, Gsealy
* @since 4.4.1
*/
public class KeyUtil {
/** Java密钥库(Java Key Store，JKS)KEY_STORE */
public static final String KEY_TYPE_JKS = "JKS";
/** jceks */
public static final String KEY_TYPE_JCEKS = "jceks";
/** PKCS12是公钥加密标准，它规定了可包含所有私钥、公钥和证书。其以二进制格式存储，也称为 PFX 文件 */
public static final String KEY_TYPE_PKCS12 = "pkcs12";
/** Certification类型：X.509 */
public static final String CERT_TYPE_X509 = "X.509";
/**
* 默认密钥字节数
*
*
* RSA/DSA
* Default Keysize 1024
* Keysize must be a multiple of 64, ranging from 512 to 1024 (inclusive).
*
*/
public static final int DEFAULT_KEY_SIZE = 1024;
/**
* SM2默认曲线
*
*
* Default SM2 curve
*
*/
public static final String SM2_DEFAULT_CURVE = "sm2p256v1";
/**
* 生成 {@link SecretKey}，仅用于对称加密和摘要算法密钥生成
*
* @param algorithm 算法，支持PBE算法
* @return {@link SecretKey}
*/
public static SecretKey generateKey(String algorithm) {
return generateKey(algorithm, -1);
}
/**
* 生成 {@link SecretKey}，仅用于对称加密和摘要算法密钥生成
*
* @param algorithm 算法，支持PBE算法
* @param keySize 密钥长度
* @return {@link SecretKey}
* @since 3.1.2
*/
public static SecretKey generateKey(String algorithm, int keySize) {
algorithm = getMainAlgorithm(algorithm);
final KeyGenerator keyGenerator = getKeyGenerator(algorithm);
if (keySize > 0) {
keyGenerator.init(keySize);
} else if (SymmetricAlgorithm.AES.getValue().equals(algorithm)) {
// 对于AES的密钥，除非指定，否则强制使用128位
keyGenerator.init(128);
}
return keyGenerator.generateKey();
}
/**
* 生成 {@link SecretKey}，仅用于对称加密和摘要算法密钥生成
*
* @param algorithm 算法
* @param key 密钥，如果为{@code null} 自动生成随机密钥
* @return {@link SecretKey}
*/
public static SecretKey generateKey(String algorithm, byte[] key) {
Assert.notBlank(algorithm, "Algorithm is blank!");
SecretKey secretKey;
if (algorithm.startsWith("PBE")) {
// PBE密钥
secretKey =
generatePBEKey(
algorithm,
(null == key) ? null : StrUtil.str(key, CharsetUtil.CHARSET_UTF_8).toCharArray());
} else if (algorithm.startsWith("DES")) {
// DES密钥
secretKey = generateDESKey(algorithm, key);
} else {
// 其它算法密钥
secretKey = (null == key) ? generateKey(algorithm) : new SecretKeySpec(key, algorithm);
}
return secretKey;
}
/**
* 生成 {@link SecretKey}
*
* @param algorithm DES算法，包括DES、DESede等
* @param key 密钥
* @return {@link SecretKey}
*/
public static SecretKey generateDESKey(String algorithm, byte[] key) {
if (StrUtil.isBlank(algorithm) || false == algorithm.startsWith("DES")) {
throw new CryptoException("Algorithm [{}] is not a DES algorithm!");
}
SecretKey secretKey;
if (null == key) {
secretKey = generateKey(algorithm);
} else {
KeySpec keySpec;
try {
if (algorithm.startsWith("DESede")) {
// DESede兼容
keySpec = new DESedeKeySpec(key);
} else {
keySpec = new DESKeySpec(key);
}
} catch (InvalidKeyException e) {
throw new CryptoException(e);
}
secretKey = generateKey(algorithm, keySpec);
}
return secretKey;
}
/**
* 生成PBE {@link SecretKey}
*
* @param algorithm PBE算法，包括：PBEWithMD5AndDES、PBEWithSHA1AndDESede、PBEWithSHA1AndRC2_40等
* @param key 密钥
* @return {@link SecretKey}
*/
public static SecretKey generatePBEKey(String algorithm, char[] key) {
if (StrUtil.isBlank(algorithm) || false == algorithm.startsWith("PBE")) {
throw new CryptoException("Algorithm [{}] is not a PBE algorithm!");
}
if (null == key) {
key = RandomUtil.randomString(32).toCharArray();
}
PBEKeySpec keySpec = new PBEKeySpec(key);
return generateKey(algorithm, keySpec);
}
/**
* 生成 {@link SecretKey}，仅用于对称加密和摘要算法
*
* @param algorithm 算法
* @param keySpec {@link KeySpec}
* @return {@link SecretKey}
*/
public static SecretKey generateKey(String algorithm, KeySpec keySpec) {
final SecretKeyFactory keyFactory = getSecretKeyFactory(algorithm);
try {
return keyFactory.generateSecret(keySpec);
} catch (InvalidKeySpecException e) {
throw new CryptoException(e);
}
}
/**
* 生成RSA私钥，仅用于非对称加密
* 采用PKCS#8规范，此规范定义了私钥信息语法和加密私钥语法
* 算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyFactory
*
* @param key 密钥，必须为DER编码存储
* @return RSA私钥 {@link PrivateKey}
* @since 4.5.2
*/
public static PrivateKey generateRSAPrivateKey(byte[] key) {
return generatePrivateKey(AsymmetricAlgorithm.RSA.getValue(), key);
}
/**
* 生成私钥，仅用于非对称加密
* 采用PKCS#8规范，此规范定义了私钥信息语法和加密私钥语法
* 算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyFactory
*
* @param algorithm 算法
* @param key 密钥，必须为DER编码存储
* @return 私钥 {@link PrivateKey}
*/
public static PrivateKey generatePrivateKey(String algorithm, byte[] key) {
if (null == key) {
return null;
}
return generatePrivateKey(algorithm, new PKCS8EncodedKeySpec(key));
}
/**
* 生成私钥，仅用于非对称加密
* 算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyFactory
*
* @param algorithm 算法
* @param keySpec {@link KeySpec}
* @return 私钥 {@link PrivateKey}
* @since 3.1.1
*/
public static PrivateKey generatePrivateKey(String algorithm, KeySpec keySpec) {
if (null == keySpec) {
return null;
}
algorithm = getAlgorithmAfterWith(algorithm);
try {
return getKeyFactory(algorithm).generatePrivate(keySpec);
} catch (Exception e) {
throw new CryptoException(e);
}
}
/**
* 生成私钥，仅用于非对称加密
*
* @param keyStore {@link KeyStore}
* @param alias 别名
* @param password 密码
* @return 私钥 {@link PrivateKey}
*/
public static PrivateKey generatePrivateKey(KeyStore keyStore, String alias, char[] password) {
try {
return (PrivateKey) keyStore.getKey(alias, password);
} catch (Exception e) {
throw new CryptoException(e);
}
}
/**
* 生成RSA公钥，仅用于非对称加密
* 采用X509证书规范
* 算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyFactory
*
* @param key 密钥，必须为DER编码存储
* @return 公钥 {@link PublicKey}
* @since 4.5.2
*/
public static PublicKey generateRSAPublicKey(byte[] key) {
return generatePublicKey(AsymmetricAlgorithm.RSA.getValue(), key);
}
/**
* 生成公钥，仅用于非对称加密
* 采用X509证书规范
* 算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyFactory
*
* @param algorithm 算法
* @param key 密钥，必须为DER编码存储
* @return 公钥 {@link PublicKey}
*/
public static PublicKey generatePublicKey(String algorithm, byte[] key) {
if (null == key) {
return null;
}
return generatePublicKey(algorithm, new X509EncodedKeySpec(key));
}
/**
* 生成公钥，仅用于非对称加密
* 算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyFactory
*
* @param algorithm 算法
* @param keySpec {@link KeySpec}
* @return 公钥 {@link PublicKey}
* @since 3.1.1
*/
public static PublicKey generatePublicKey(String algorithm, KeySpec keySpec) {
if (null == keySpec) {
return null;
}
algorithm = getAlgorithmAfterWith(algorithm);
try {
return getKeyFactory(algorithm).generatePublic(keySpec);
} catch (Exception e) {
throw new CryptoException(e);
}
}
/**
* 生成用于非对称加密的公钥和私钥，仅用于非对称加密
* 密钥对生成算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyPairGenerator
*
* @param algorithm 非对称加密算法
* @return {@link KeyPair}
*/
public static KeyPair generateKeyPair(String algorithm) {
return generateKeyPair(algorithm, DEFAULT_KEY_SIZE);
}
/**
* 生成用于非对称加密的公钥和私钥
* 密钥对生成算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyPairGenerator
*
* @param algorithm 非对称加密算法
* @param keySize 密钥模（modulus ）长度
* @return {@link KeyPair}
*/
public static KeyPair generateKeyPair(String algorithm, int keySize) {
return generateKeyPair(algorithm, keySize, null);
}
/**
* 生成用于非对称加密的公钥和私钥
* 密钥对生成算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyPairGenerator
*
* @param algorithm 非对称加密算法
* @param keySize 密钥模（modulus ）长度
* @param seed 种子
* @return {@link KeyPair}
*/
public static KeyPair generateKeyPair(String algorithm, int keySize, byte[] seed) {
// SM2算法需要单独定义其曲线生成
if ("SM2".equalsIgnoreCase(algorithm)) {
final ECGenParameterSpec sm2p256v1 = new ECGenParameterSpec(SM2_DEFAULT_CURVE);
return generateKeyPair(algorithm, keySize, seed, sm2p256v1);
}
return generateKeyPair(algorithm, keySize, seed, (AlgorithmParameterSpec[]) null);
}
/**
* 生成用于非对称加密的公钥和私钥
* 密钥对生成算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyPairGenerator
*
* @param algorithm 非对称加密算法
* @param params {@link AlgorithmParameterSpec}
* @return {@link KeyPair}
* @since 4.3.3
*/
public static KeyPair generateKeyPair(String algorithm, AlgorithmParameterSpec params) {
return generateKeyPair(algorithm, null, params);
}
/**
* 生成用于非对称加密的公钥和私钥
* 密钥对生成算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyPairGenerator
*
* @param algorithm 非对称加密算法
* @param param {@link AlgorithmParameterSpec}
* @param seed 种子
* @return {@link KeyPair}
* @since 4.3.3
*/
public static KeyPair generateKeyPair(
String algorithm, byte[] seed, AlgorithmParameterSpec param) {
return generateKeyPair(algorithm, DEFAULT_KEY_SIZE, seed, param);
}
/**
* 生成用于非对称加密的公钥和私钥
* 密钥对生成算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyPairGenerator
*
* 对于非对称加密算法，密钥长度有严格限制，具体如下：
*
*
RSA：
*
*
* RS256、PS256：2048 bits
* RS384、PS384：3072 bits
* RS512、RS512：4096 bits
*
*
* EC（Elliptic Curve）：
*
*
* EC256：256 bits
* EC384：384 bits
* EC512：512 bits
*
*
* @param algorithm 非对称加密算法
* @param keySize 密钥模（modulus ）长度（单位bit）
* @param seed 种子
* @param params {@link AlgorithmParameterSpec}
* @return {@link KeyPair}
* @since 4.3.3
*/
public static KeyPair generateKeyPair(
String algorithm, int keySize, byte[] seed, AlgorithmParameterSpec... params) {
return generateKeyPair(algorithm, keySize, RandomUtil.createSecureRandom(seed), params);
}
/**
* 生成用于非对称加密的公钥和私钥
* 密钥对生成算法见：https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#KeyPairGenerator
*
* 对于非对称加密算法，密钥长度有严格限制，具体如下：
*
*
RSA：
*
*
* RS256、PS256：2048 bits
* RS384、PS384：3072 bits
* RS512、RS512：4096 bits
*
*
* EC（Elliptic Curve）：
*
*
* EC256：256 bits
* EC384：384 bits
* EC512：512 bits
*
*
* @param algorithm 非对称加密算法
* @param keySize 密钥模（modulus ）长度（单位bit）
* @param random {@link SecureRandom} 对象，创建时可选传入seed
* @param params {@link AlgorithmParameterSpec}
* @return {@link KeyPair}
* @since 4.6.5
*/
public static KeyPair generateKeyPair(
String algorithm, int keySize, SecureRandom random, AlgorithmParameterSpec... params) {
algorithm = getAlgorithmAfterWith(algorithm);
final KeyPairGenerator keyPairGen = getKeyPairGenerator(algorithm);
// 密钥模（modulus ）长度初始化定义
if (keySize > 0) {
// key长度适配修正
if ("EC".equalsIgnoreCase(algorithm) && keySize > 256) {
// 对于EC（EllipticCurve）算法，密钥长度有限制，在此使用默认256
keySize = 256;
}
if (null != random) {
keyPairGen.initialize(keySize, random);
} else {
keyPairGen.initialize(keySize);
}
}
// 自定义初始化参数
if (ArrayUtil.isNotEmpty(params)) {
for (AlgorithmParameterSpec param : params) {
if (null == param) {
continue;
}
try {
if (null != random) {
keyPairGen.initialize(param, random);
} else {
keyPairGen.initialize(param);
}
} catch (InvalidAlgorithmParameterException e) {
throw new CryptoException(e);
}
}
}
return keyPairGen.generateKeyPair();
}
/**
* 获取{@link KeyPairGenerator}
*
* @param algorithm 非对称加密算法
* @return {@link KeyPairGenerator}
* @since 4.4.3
*/
public static KeyPairGenerator getKeyPairGenerator(String algorithm) {
final Provider provider = GlobalBouncyCastleProvider.INSTANCE.getProvider();
KeyPairGenerator keyPairGen;
try {
keyPairGen =
(null == provider) //
? KeyPairGenerator.getInstance(getMainAlgorithm(algorithm)) //
: KeyPairGenerator.getInstance(getMainAlgorithm(algorithm), provider); //
} catch (NoSuchAlgorithmException e) {
throw new CryptoException(e);
}
return keyPairGen;
}
/**
* 获取{@link KeyFactory}
*
* @param algorithm 非对称加密算法
* @return {@link KeyFactory}
* @since 4.4.4
*/
public static KeyFactory getKeyFactory(String algorithm) {
final Provider provider = GlobalBouncyCastleProvider.INSTANCE.getProvider();
KeyFactory keyFactory;
try {
keyFactory =
(null == provider) //
? KeyFactory.getInstance(getMainAlgorithm(algorithm)) //
: KeyFactory.getInstance(getMainAlgorithm(algorithm), provider);
} catch (NoSuchAlgorithmException e) {
throw new CryptoException(e);
}
return keyFactory;
}
/**
* 获取{@link SecretKeyFactory}
*
* @param algorithm 对称加密算法
* @return {@link KeyFactory}
* @since 4.5.2
*/
public static SecretKeyFactory getSecretKeyFactory(String algorithm) {
final Provider provider = GlobalBouncyCastleProvider.INSTANCE.getProvider();
SecretKeyFactory keyFactory;
try {
keyFactory =
(null == provider) //
? SecretKeyFactory.getInstance(getMainAlgorithm(algorithm)) //
: SecretKeyFactory.getInstance(getMainAlgorithm(algorithm), provider);
} catch (NoSuchAlgorithmException e) {
throw new CryptoException(e);
}
return keyFactory;
}
/**
* 获取{@link KeyGenerator}
*
* @param algorithm 对称加密算法
* @return {@link KeyGenerator}
* @since 4.5.2
*/
public static KeyGenerator getKeyGenerator(String algorithm) {
final Provider provider = GlobalBouncyCastleProvider.INSTANCE.getProvider();
KeyGenerator generator;
try {
generator =
(null == provider) //
? KeyGenerator.getInstance(getMainAlgorithm(algorithm)) //
: KeyGenerator.getInstance(getMainAlgorithm(algorithm), provider);
} catch (NoSuchAlgorithmException e) {
throw new CryptoException(e);
}
return generator;
}
/**
* 获取主体算法名，例如RSA/ECB/PKCS1Padding的主体算法是RSA
*
* @param algorithm XXXwithXXX算法
* @return 主体算法名
* @since 4.5.2
*/
public static String getMainAlgorithm(String algorithm) {
final int slashIndex = algorithm.indexOf(CharUtil.SLASH);
if (slashIndex > 0) {
return algorithm.substring(0, slashIndex);
}
return algorithm;
}
/**
* 获取用于密钥生成的算法
* 获取XXXwithXXX算法的后半部分算法，如果为ECDSA或SM2，返回算法为EC
*
* @param algorithm XXXwithXXX算法
* @return 算法
*/
public static String getAlgorithmAfterWith(String algorithm) {
Assert.notNull(algorithm, "algorithm must be not null !");
int indexOfWith = StrUtil.lastIndexOfIgnoreCase(algorithm, "with");
if (indexOfWith > 0) {
algorithm = StrUtil.subSuf(algorithm, indexOfWith + "with".length());
}
if ("ECDSA".equalsIgnoreCase(algorithm) || "SM2".equalsIgnoreCase(algorithm)) {
algorithm = "EC";
}
return algorithm;
}
/**
* 读取密钥库(Java Key Store，JKS) KeyStore文件
* KeyStore文件用于数字证书的密钥对保存
* see: http://snowolf.iteye.com/blog/391931
*
* @param in {@link InputStream} 如果想从文件读取.keystore文件，使用 {@link
* FileUtil#getInputStream(java.io.File)} 读取
* @param password 密码
* @return {@link KeyStore}
*/
public static KeyStore readJKSKeyStore(InputStream in, char[] password) {
return readKeyStore(KEY_TYPE_JKS, in, password);
}
/**
* 读取KeyStore文件
* KeyStore文件用于数字证书的密钥对保存
* see: http://snowolf.iteye.com/blog/391931
*
* @param type 类型
* @param in {@link InputStream} 如果想从文件读取.keystore文件，使用 {@link
* FileUtil#getInputStream(java.io.File)} 读取
* @param password 密码，null表示无密码
* @return {@link KeyStore}
*/
public static KeyStore readKeyStore(String type, InputStream in, char[] password) {
KeyStore keyStore;
try {
keyStore = KeyStore.getInstance(type);
keyStore.load(in, password);
} catch (Exception e) {
throw new CryptoException(e);
}
return keyStore;
}
/**
* 从KeyStore中获取私钥公钥
*
* @param type 类型
* @param in {@link InputStream} 如果想从文件读取.keystore文件，使用 {@link
* FileUtil#getInputStream(java.io.File)} 读取
* @param password 密码
* @param alias 别名
* @return {@link KeyPair}
* @since 4.4.1
*/
public static KeyPair getKeyPair(String type, InputStream in, char[] password, String alias) {
final KeyStore keyStore = readKeyStore(type, in, password);
return getKeyPair(keyStore, password, alias);
}
/**
* 从KeyStore中获取私钥公钥
*
* @param keyStore {@link KeyStore}
* @param password 密码
* @param alias 别名
* @return {@link KeyPair}
* @since 4.4.1
*/
public static KeyPair getKeyPair(KeyStore keyStore, char[] password, String alias) {
PublicKey publicKey;
PrivateKey privateKey;
try {
publicKey = keyStore.getCertificate(alias).getPublicKey();
privateKey = (PrivateKey) keyStore.getKey(alias, password);
} catch (Exception e) {
throw new CryptoException(e);
}
return new KeyPair(publicKey, privateKey);
}
/**
* 读取X.509 Certification文件
* Certification为证书文件
* see: http://snowolf.iteye.com/blog/391931
*
* @param in {@link InputStream} 如果想从文件读取.cer文件，使用 {@link FileUtil#getInputStream(java.io.File)}
* 读取
* @param password 密码
* @param alias 别名
* @return {@link KeyStore}
* @since 4.4.1
*/
public static Certificate readX509Certificate(InputStream in, char[] password, String alias) {
return readCertificate(CERT_TYPE_X509, in, password, alias);
}
/**
* 读取X.509 Certification文件中的公钥
* Certification为证书文件
* see: https://www.cnblogs.com/yinliang/p/10115519.html
*
* @param in {@link InputStream} 如果想从文件读取.cer文件，使用 {@link FileUtil#getInputStream(java.io.File)}
* 读取
* @return {@link KeyStore}
* @since 4.5.2
*/
public static PublicKey readPublicKeyFromCert(InputStream in) {
final Certificate certificate = readX509Certificate(in);
if (null != certificate) {
return certificate.getPublicKey();
}
return null;
}
/**
* 读取X.509 Certification文件
* Certification为证书文件
* see: http://snowolf.iteye.com/blog/391931
*
* @param in {@link InputStream} 如果想从文件读取.cer文件，使用 {@link FileUtil#getInputStream(java.io.File)}
* 读取
* @return {@link KeyStore}
* @since 4.4.1
*/
public static Certificate readX509Certificate(InputStream in) {
return readCertificate(CERT_TYPE_X509, in);
}
/**
* 读取Certification文件
* Certification为证书文件
* see: http://snowolf.iteye.com/blog/391931
*
* @param type 类型，例如X.509
* @param in {@link InputStream} 如果想从文件读取.cer文件，使用 {@link FileUtil#getInputStream(java.io.File)}
* 读取
* @param password 密码
* @param alias 别名
* @return {@link KeyStore}
* @since 4.4.1
*/
public static Certificate readCertificate(
String type, InputStream in, char[] password, String alias) {
final KeyStore keyStore = readKeyStore(type, in, password);
try {
return keyStore.getCertificate(alias);
} catch (KeyStoreException e) {
throw new CryptoException(e);
}
}
/**
* 读取Certification文件
* Certification为证书文件
* see: http://snowolf.iteye.com/blog/391931
*
* @param type 类型，例如X.509
* @param in {@link InputStream} 如果想从文件读取.cer文件，使用 {@link FileUtil#getInputStream(java.io.File)}
* 读取
* @return {@link Certificate}
*/
public static Certificate readCertificate(String type, InputStream in) {
try {
return getCertificateFactory(type).generateCertificate(in);
} catch (CertificateException e) {
throw new CryptoException(e);
}
}
/**
* 获得 Certification
*
* @param keyStore {@link KeyStore}
* @param alias 别名
* @return {@link Certificate}
*/
public static Certificate getCertificate(KeyStore keyStore, String alias) {
try {
return keyStore.getCertificate(alias);
} catch (Exception e) {
throw new CryptoException(e);
}
}
/**
* 获取{@link CertificateFactory}
*
* @param type 类型，例如X.509
* @return {@link KeyPairGenerator}
* @since 4.5.0
*/
public static CertificateFactory getCertificateFactory(String type) {
final Provider provider = GlobalBouncyCastleProvider.INSTANCE.getProvider();
CertificateFactory factory;
try {
factory =
(null == provider)
? CertificateFactory.getInstance(type)
: CertificateFactory.getInstance(type, provider);
} catch (CertificateException e) {
throw new CryptoException(e);
}
return factory;
}
/**
* 编码压缩EC公钥（基于BouncyCastle）
* 见：https://www.cnblogs.com/xinzhao/p/8963724.html
*
* @param publicKey {@link
* PublicKey}，必须为org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey
* @return 压缩得到的X
* @since 4.4.4
*/
public static byte[] encodeECPublicKey(PublicKey publicKey) {
return BCUtil.encodeECPublicKey(publicKey);
}
/**
* 解码恢复EC压缩公钥,支持Base64和Hex编码,（基于BouncyCastle）
* 见：https://www.cnblogs.com/xinzhao/p/8963724.html
*
* @param encode 压缩公钥
* @param curveName EC曲线名
* @return 公钥
* @since 4.4.4
*/
public static PublicKey decodeECPoint(String encode, String curveName) {
return BCUtil.decodeECPoint(encode, curveName);
}
/**
* 解码恢复EC压缩公钥,支持Base64和Hex编码,（基于BouncyCastle）
* 见：https://www.cnblogs.com/xinzhao/p/8963724.html
*
* @param encodeByte 压缩公钥
* @param curveName EC曲线名
* @return 公钥
* @since 4.4.4
*/
public static PublicKey decodeECPoint(byte[] encodeByte, String curveName) {
return BCUtil.decodeECPoint(encodeByte, curveName);
}
}