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Rsa加密类
需要导入Base64.jar包 import java.io.ByteArrayOutputStream; import java.security.Key; import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.PublicKey; import java.security.Signature; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; import java.util.HashMap; import java.util.Map; import javax.crypto.Cipher; import Decoder.BASE64Decoder; import Decoder.BASE64Encoder; public class RSACrypt { /** * 文件读取缓冲区大小 */ private static final int CACHE_SIZE = 1024; /** * <p> * BASE64字符串解码为二进制数据 * </p> * * @param base64 * @return * @throws Exception */ public static byte[] decode(String base64) throws Exception { return new BASE64Decoder().decodeBuffer(base64); } /** * <p> * 二进制数据编码为BASE64字符串 * </p> * * @param bytes * @return * @throws Exception */ public static String encode(byte[] bytes) throws Exception { return new BASE64Encoder().encode(bytes); } /** * 加密算法RSA */ // public static final String KEY_ALGORITHM = "RSA"; public static final String KEY_ALGORITHM = "RSA"; /** * 签名算法 */ public static final String SIGNATURE_ALGORITHM = "MD5withRSA"; /** * 获取公钥的key */ private static final String PUBLIC_KEY = "RSAPublicKey"; /** * 获取私钥的key */ private static final String PRIVATE_KEY = "RSAPrivateKey"; /** * RSA最大加密明文大小 */ private static final int MAX_ENCRYPT_BLOCK = 117; /** * RSA最大解密密文大小 */ private static final int MAX_DECRYPT_BLOCK = 128; /** * <p> * 生成密钥对(公钥和私钥) * </p> * * @return * @throws Exception */ public static Map<String, Object> genKeyPair() throws Exception { KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM); keyPairGen.initialize(1024); KeyPair keyPair = keyPairGen.generateKeyPair(); RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); Map<String, Object> keyMap = new HashMap<String, Object>(2); keyMap.put(PUBLIC_KEY, publicKey); keyMap.put(PRIVATE_KEY, privateKey); return keyMap; } /** * <p> * 生成密钥对(公钥和私钥) * </p> * * @return * @throws Exception */ public static Map<String, Object> genKeyPair(String seed) throws Exception { KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM); keyPairGen.initialize(1024); // SecureRandom secrand = new SecureRandom(); // secrand.setSeed(seed.getBytes()); // 初始化随机产生器 // keyPairGen.initialize(1024, secrand); KeyPair keyPair = keyPairGen.generateKeyPair(); RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); Map<String, Object> keyMap = new HashMap<String, Object>(2); keyMap.put(PUBLIC_KEY, publicKey); keyMap.put(PRIVATE_KEY, privateKey); return keyMap; } /** * <p> * 用私钥对信息生成数字签名 * </p> * * @param data * 已加密数据 * @param privateKey * 私钥(BASE64编码) * * @return * @throws Exception */ public static String sign(byte[] data, String privateKey) throws Exception { byte[] keyBytes = decode(privateKey); PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec); Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM); signature.initSign(privateK); signature.update(data); return encode(signature.sign()); } /** * <p> * 校验数字签名 * </p> * * @param data * 已加密数据 * @param publicKey * 公钥(BASE64编码) * @param sign * 数字签名 * * @return * @throws Exception * */ public static boolean verify(byte[] data, String publicKey, String sign) throws Exception { byte[] keyBytes = decode(publicKey); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); PublicKey publicK = keyFactory.generatePublic(keySpec); Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM); signature.initVerify(publicK); signature.update(data); return signature.verify(decode(sign)); } /** * <P> * 私钥解密 * </p> * * @param encryptedData * 已加密数据 * @param privateKey * 私钥(BASE64编码) * @return * @throws Exception */ public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey) throws Exception { byte[] keyBytes = decode(privateKey); PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); Key privateK = keyFactory.generatePrivate(pkcs8KeySpec); // Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING"); cipher.init(Cipher.DECRYPT_MODE, privateK); int inputLen = encryptedData.length; ByteArrayOutputStream out = new ByteArrayOutputStream(); int offSet = 0; byte[] cache; int i = 0; // 对数据分段解密 while (inputLen - offSet > 0) { if (inputLen - offSet > MAX_DECRYPT_BLOCK) { cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK); } else { cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_DECRYPT_BLOCK; } byte[] decryptedData = http://www.mamicode.com/out.toByteArray();"RSA/ECB/PKCS1PADDING"); cipher.init(Cipher.DECRYPT_MODE, publicK); int inputLen = encryptedData.length; ByteArrayOutputStream out = new ByteArrayOutputStream(); int offSet = 0; byte[] cache; int i = 0; // 对数据分段解密 while (inputLen - offSet > 0) { if (inputLen - offSet > MAX_DECRYPT_BLOCK) { cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK); } else { cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_DECRYPT_BLOCK; } byte[] decryptedData = http://www.mamicode.com/out.toByteArray();"RSA/ECB/PKCS1PADDING"); cipher.init(Cipher.ENCRYPT_MODE, publicK); int inputLen = data.length; ByteArrayOutputStream out = new ByteArrayOutputStream(); int offSet = 0; byte[] cache; int i = 0; // 对数据分段加密 while (inputLen - offSet > 0) { if (inputLen - offSet > MAX_ENCRYPT_BLOCK) { cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK); } else { cache = cipher.doFinal(data, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_ENCRYPT_BLOCK; } byte[] encryptedData = http://www.mamicode.com/out.toByteArray();"RSA/ECB/PKCS1PADDING"); cipher.init(Cipher.ENCRYPT_MODE, privateK); int inputLen = data.length; ByteArrayOutputStream out = new ByteArrayOutputStream(); int offSet = 0; byte[] cache; int i = 0; // 对数据分段加密 while (inputLen - offSet > 0) { if (inputLen - offSet > MAX_ENCRYPT_BLOCK) { cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK); } else { cache = cipher.doFinal(data, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_ENCRYPT_BLOCK; } byte[] encryptedData = http://www.mamicode.com/out.toByteArray();"MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAKB8GunT65dDzvV4" + "VD6UA9+lGEjIgEtyEVtrp3rEhBRmvOZ1sromkybrAF4ByodHh1BmgBLdImMqMzH2" + "vgwc3ioOqiaODqHNPpqa/jeSrdNE/hJSKQqPXi+qVaIg6tOi84GnirHOrwkVxR45" + "kQgj4lH7qnIaMhooaIModIsDTGs7AgMBAAECgYEAg/Jlwlhtu9mRgDslsKnLoYZA" + "uB65dM5dPPf/JC4MliV+LFEa2Hg8xmOy0pfQZ3dE5rLPnDLaQgQBQZQn3xehBE/N" + "2YdzLEH1Dpw1eOJY30Qf/Rp6jUaTwY5gQCxSDt24CXpDjzo09dvaR4uHhRNZX1KB" + "XNco+PiM7ujFaSrhuBkCQQDQC3d2OhQB4vAaxaPzwqQv6lAFWCR8Osy5jyY/KlVF" + "kd/VzXp2uWACgFm6UXmUwyLfrSpFl013E5SjOsdgpXYNAkEAxXoqed1TYAHHS63N" + "oIQlMz/ygHiMtkFeoD8HgKYw5TzYCpqlM++2O1VcbTLjQtnwctIe3B3xF7eOZ1Si" + "53KcZwJAdPaNYhWC3BCnJpYI9+ls/1c/R9HnKUSxhn05Zne5WxSJAB22hPrxRFa+" + "m2Zk8ULH33LuehN3RMPoY+CO6QH9HQJBAK9+JrtP7iU2z2a42TEZ3nlSDe8PsnTR" + "WQdtm/w/NNqznIan8cJa+AZ4kH/WplIlneJcSuJwlW3vSNUZSQAIQWcCQHBsB41q" + "WyyPcRBjMCR6YO4Iih/07kZJDAqHrdnhea+aNF+MPuShqIGlcDEbdeS1XxUp8gSm" + "diXEh5aJvpTfSEY="; String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCgfBrp0+uXQ871eFQ+lAPfpRhI" + "yIBLchFba6d6xIQUZrzmdbK6JpMm6wBeAcqHR4dQZoAS3SJjKjMx9r4MHN4qDqom" + "jg6hzT6amv43kq3TRP4SUikKj14vqlWiIOrTovOBp4qxzq8JFcUeOZEII+JR+6py" + "GjIaKGiDKHSLA0xrOwIDAQAB"; System.out.println("privateKey=" + privateKey); System.err.println("私钥加密——公钥解密"); String source = "hyx_912_74571852356eb1dd4902f66c9c7ad103e8285d010d27488b"; System.out.println("原文字:\r\n" + source); byte[] data = http://www.mamicode.com/source.getBytes();"加密后:\r\n" + enBaseDate); // byte[] decryptByPublicKey = RSACrypt.decryptByPublicKey(encodedData, publicKey); byte[] decryptByPublicKey = RSACrypt.decryptByPrivateKey(encodedData, privateKey); System.out.println("解密后:\r\n" + new String(decryptByPublicKey)); } catch (Exception e) { e.printStackTrace(); } } }
Rsa加密类
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