| 提交 | 用户 | 时间 | ||
| 58d006 | 1 | package com.mandi.common; |
| A | 2 | |
| 3 | import java.security.KeyFactory; | |
| 4 | import java.security.KeyPair; | |
| 5 | import java.security.KeyPairGenerator; | |
| 6 | import java.security.PrivateKey; | |
| 7 | import java.security.PublicKey; | |
| 8 | import java.security.SecureRandom; | |
| 9 | import java.security.Signature; | |
| 10 | import java.security.interfaces.DSAPrivateKey; | |
| 11 | import java.security.interfaces.DSAPublicKey; | |
| 12 | import java.security.spec.PKCS8EncodedKeySpec; | |
| 13 | import java.security.spec.X509EncodedKeySpec; | |
| 14 | import java.util.HashMap; | |
| 15 | import java.util.Map; | |
| 16 | ||
| 17 | import org.springframework.util.Base64Utils; | |
| 18 | ||
| 19 | /** | |
| 20 | * @author mengly | |
| 21 | * @version 创建时间：2015年10月27日 下午6:53:16 | |
| 22 | * 类说明 :签名 | |
| 23 | */ | |
| 24 | ||
| 25 | public class DSAMethod { | |
| 26 | /** | |
| 27 | * 用私钥对信息生成数字签名 | |
| 28 | * | |
| 29 | * @param data | |
| 30 | * 加密数据 | |
| 31 | * @param privateKey | |
| 32 | * 私钥 | |
| 33 | * | |
| 34 | * @return | |
| 35 | * @throws Exception | |
| 36 | */ | |
| 37 | public static String sign(byte[] data, String privateKey) throws Exception { | |
| 38 | // 解密由base64编码的私钥 | |
| 39 | byte[] keyBytes =Base64Utils.decodeFromString(privateKey); | |
| 40 | ||
| 41 | // 构造PKCS8EncodedKeySpec对象 | |
| 42 | PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); | |
| 43 | ||
| 44 | // KEY_ALGORITHM 指定的加密算法 | |
| 45 | KeyFactory keyFactory = KeyFactory.getInstance("DSA"); | |
| 46 | ||
| 47 | // 取私钥匙对象 | |
| 48 | PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec); | |
| 49 | ||
| 50 | // 用私钥对信息生成数字签名 | |
| 51 | Signature signature = Signature.getInstance(keyFactory.getAlgorithm()); | |
| 52 | signature.initSign(priKey); | |
| 53 | signature.update(data); | |
| 54 | ||
| 55 | return Base64Utils.encodeToString(signature.sign()); | |
| 56 | } | |
| 57 | /** | |
| 58 | * 用私钥对信息生成数字签名 | |
| 59 | * | |
| 60 | * @param data | |
| 61 | * 加密数据 | |
| 62 | * @param privateKey | |
| 63 | * 私钥 | |
| 64 | * | |
| 65 | * @return | |
| 66 | * @throws Exception | |
| 67 | */ | |
| 68 | public static String sign(String content, String privateKey) throws Exception { | |
| 69 | // 解密由base64编码的私钥 | |
| 70 | byte[] data=content.getBytes("utf-8"); | |
| 71 | byte[] keyBytes =Base64Utils.decodeFromString(privateKey); | |
| 72 | ||
| 73 | // 构造PKCS8EncodedKeySpec对象 | |
| 74 | PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); | |
| 75 | ||
| 76 | // KEY_ALGORITHM 指定的加密算法 | |
| 77 | KeyFactory keyFactory = KeyFactory.getInstance("DSA"); | |
| 78 | ||
| 79 | // 取私钥匙对象 | |
| 80 | PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec); | |
| 81 | ||
| 82 | // 用私钥对信息生成数字签名 | |
| 83 | Signature signature = Signature.getInstance(keyFactory.getAlgorithm()); | |
| 84 | signature.initSign(priKey); | |
| 85 | signature.update(data); | |
| 86 | ||
| 87 | return Base64Utils.encodeToString(signature.sign()); | |
| 88 | } | |
| 89 | public static boolean verify(String content, String publicKey, String sign) | |
| 90 | throws Exception { | |
| 91 | byte[] data=content.getBytes("utf-8"); | |
| 92 | // 解密由base64编码的公钥 | |
| 93 | byte[] keyBytes = Base64Utils.decodeFromString(publicKey); | |
| 94 | ||
| 95 | // 构造X509EncodedKeySpec对象 | |
| 96 | X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); | |
| 97 | ||
| 98 | // ALGORITHM 指定的加密算法 | |
| 99 | KeyFactory keyFactory = KeyFactory.getInstance("DSA"); | |
| 100 | ||
| 101 | // 取公钥匙对象 | |
| 102 | PublicKey pubKey = keyFactory.generatePublic(keySpec); | |
| 103 | ||
| 104 | Signature signature = Signature.getInstance(keyFactory.getAlgorithm()); | |
| 105 | signature.initVerify(pubKey); | |
| 106 | signature.update(data); | |
| 107 | ||
| 108 | // 验证签名是否正常 | |
| 109 | return signature.verify(Base64Utils.decodeFromString(sign)); | |
| 110 | } | |
| 111 | ||
| 112 | ||
| 113 | /** | |
| 114 | * 生成密钥 | |
| 115 | * | |
| 116 | * @param seed | |
| 117 | * 种子 | |
| 118 | * @return 密钥对象 | |
| 119 | * @throws Exception | |
| 120 | */ | |
| 121 | public static Map<String, Object> initKey(String seed) throws Exception { | |
| 122 | KeyPairGenerator keygen = KeyPairGenerator.getInstance("DSA"); | |
| 123 | // 初始化随机产生器 | |
| 124 | SecureRandom secureRandom = new SecureRandom(); | |
| 125 | secureRandom.setSeed(seed.getBytes()); | |
| 126 | keygen.initialize(1024, secureRandom); | |
| 127 | ||
| 128 | KeyPair keys = keygen.genKeyPair(); | |
| 129 | ||
| 130 | DSAPublicKey publicKey = (DSAPublicKey) keys.getPublic(); | |
| 131 | DSAPrivateKey privateKey = (DSAPrivateKey) keys.getPrivate(); | |
| 132 | ||
| 133 | Map<String, Object> map = new HashMap<String, Object>(2); | |
| 134 | map.put("publicKey", publicKey); | |
| 135 | map.put("privateKey", privateKey); | |
| 136 | ||
| 137 | return map; | |
| 138 | } | |
| 139 | } | |
