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Java中使用OpenSSL生成的RSA公私钥
RSA是什么:RSA公钥加密算法是1977年由Ron Rivest、Adi Shamirh和LenAdleman在(美国麻省理工学院)开发的。RSA取名来自开发他们三者的名字。RSA是目前最有影响力的公钥加密算法,它能够抵抗到目前为止已知的所有密码攻击,已被ISO推荐为公钥数据加密标准。目前该加密方式广泛用于网上银行、数字签名等场合。RSA算法基于一个十分简单的数论事实:将两个大素数相乘十分容易,但那时想要对其乘积进行因式分解却极其困难,因此可以将乘积公开作为加密密钥。
OpenSSL是什么:众多的密码算法、公钥基础设施标准以及SSL协议,或许这些有趣的功能会让你产生实现所有这些算法和标准的想法。果真如此,在对你表示敬佩的同时,还是忍不住提醒你:这是一个令人望而生畏的过程。这个工作不再是简单的读懂几本密码学专著和协议文档那么简单,而是要理解所有这些算法、标准和协议文档的每一个细节,并用你可能很熟悉的C语言字符一个一个去实现这些定义和过程。我们不知道你将需要多少时间来完成这项有趣而可怕的工作,但肯定不是一年两年的问题。OpenSSL就是由Eric A. Young和Tim J. Hudson两位绝世大好人自1995年就开始编写的集合众多安全算法的算法集合。通过命令或者开发库,我们可以轻松实现标准的公开算法应用。
下面将介绍如何生成和使用秘钥。
一、使用OpenSSL来生成私钥和公钥
先验证系统上是否已经安装OpenSSL工具,Linux系统默认安装,但Windows默认没安装,需自行下载安装。请参考:Windows安装openssl
λ openssl.exe version -a OpenSSL 1.1.0e 16 Feb 2017 built on: reproducible build, date unspecified platform: compiler: cl " "VC-WIN64A OPENSSLDIR: "C:\Program Files\Common Files\SSL" ENGINESDIR: "C:\Program Files\OpenSSL\lib\engines-1_1"
先来生成私钥:
λ openssl genrsa -out rsa_private_key.pem 1024 Generating RSA private key, 1024 bit long modulus ....................................++++++ ........++++++ e is 65537 (0x010001)
这条命令让openssl随机生成了一份私钥,加密长度是1024位。加密长度是指理论上最大允许”被加密的信息“长度的限制,也就是明文的长度限制。随着这个参数的增大(比方说2048),允许的明文长度也会增加,但同时也会造成计算复杂度的极速增长。一般推荐的长度就是1024位(128字节)。
我们来看一下私钥的内容:
-----BEGIN RSA PRIVATE KEY----- MIICWwIBAAKBgQDKeYC1p4iE7koV4JOlr+doVwIyhcI3q+q/MkBtPPN/w4J/2h3U LqaKXb54Fs8ON9rDFEVLShtbxX6fYx3vBEArrd516KWYYcx5la1vr1KHFtJScN/p 3u0vwSj7ElE8U7aZwtkXL7iqGGLOyM1wQNqyIMi7nayPeOP2RzSYy2uUQQIDAQAB AoGAXWteJXJdHOhNKnbp6MKWhJ/Qlbr9d25M61amP0CmIMb2SUM8DBBSKvlBzmrH sgm3V9bcefaBVQB0gdnbj9JoQGzTOVNqVTVFg46a99uNpVja3HWdvZWDs4YKN4cE DGhHxu5DeyV/K4r3Paz/0mSBAu3Sn0l6ROejXX2GnKZFAAECQQDqjUhLSiTVAJfn rukJxEEJcvT0ELBxEu0OqiUNZCI2tbwWAP+KcZTJdJq5LR0O/ruFoUM+TskM+27y SrDuFLQBAkEA3P1PoFcYL7rs3vVG6LJZTNDz/rrG3wjMelVFUm3X7AiTqeChmh3Y HRvhoeRdP/O1Dc6MkmvKtMhmAFX3ZqngQQJASP38sIl7Wtoba9tP5F0xzCn9NvL2 pcm5AiZK75bo2tPFm6dl3wSnw+XIvLXgZCk73EMqNPq5sJOSnE5IL188AQJAL39q i+XsVuXwX4OMeBtNQktvBgMTF4EGogyN18ewLxUw18RmN3/OoYMKngc9W69/7LXG VPpCGVUxR0Uy5agBgQJAGUa3uV3UTGBSxbbtII+9NRmlFTh+EsamP/iPErCr+pmI os8GvX7q24bkYvVddXu4hwLaplXrwTjNaAs1w390IQ== -----END RSA PRIVATE KEY-----
内容都是标准的ASCII字符,开头一行和结尾一行有明显的标记,真正的私钥数据是中间的不规则字符。
密钥文件最终将数据通过Base64编码进行存储。可以看到上述密钥文件内容每一行的长度都很规律。这是由于RFC2045中规定:The encoded output stream must be represented in lines of no more than 76 characters each。也就是说Base64编码的数据每行最多不超过76字符,对于超长数据需要按行分割。
接下来根据私钥生成公钥:
λ openssl rsa -in rsa_private_key.pem -out rsa_public_key.pem -pubout writing RSA key
再来看一下公钥的内容:
-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDKeYC1p4iE7koV4JOlr+doVwIy hcI3q+q/MkBtPPN/w4J/2h3ULqaKXb54Fs8ON9rDFEVLShtbxX6fYx3vBEArrd51 6KWYYcx5la1vr1KHFtJScN/p3u0vwSj7ElE8U7aZwtkXL7iqGGLOyM1wQNqyIMi7 nayPeOP2RzSYy2uUQQIDAQAB -----END PUBLIC KEY-----
这时候的私钥还不能直接被使用,需要进行PKCS#8编码:
λ openssl pkcs8 -topk8 -in rsa_private_key.pem -out pkcs8_rsa_private_key.pem -nocrypt
命令中指明了输入私钥文件为rsa_private_key.pem,输出私钥文件为pkcs8_rsa_private_key.pem,不采用任何二次加密(-nocrypt)
如果不进行PKCS#8编码,Java在使用时会报错:
java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: IOException : algid parse error, not a sequence
再来看一下,编码后的私钥文件是不是和之前的私钥文件不同了:
-----BEGIN PRIVATE KEY----- MIICdQIBADANBgkqhkiG9w0BAQEFAASCAl8wggJbAgEAAoGBAMp5gLWniITuShXg k6Wv52hXAjKFwjer6r8yQG0883/Dgn/aHdQupopdvngWzw432sMURUtKG1vFfp9j He8EQCut3nXopZhhzHmVrW+vUocW0lJw3+ne7S/BKPsSUTxTtpnC2RcvuKoYYs7I zXBA2rIgyLudrI944/ZHNJjLa5RBAgMBAAECgYBda14lcl0c6E0qdunowpaEn9CV uv13bkzrVqY/QKYgxvZJQzwMEFIq+UHOaseyCbdX1tx59oFVAHSB2duP0mhAbNM5 U2pVNUWDjpr3242lWNrcdZ29lYOzhgo3hwQMaEfG7kN7JX8rivc9rP/SZIEC7dKf SXpE56NdfYacpkUAAQJBAOqNSEtKJNUAl+eu6QnEQQly9PQQsHES7Q6qJQ1kIja1 vBYA/4pxlMl0mrktHQ7+u4WhQz5OyQz7bvJKsO4UtAECQQDc/U+gVxgvuuze9Ubo sllM0PP+usbfCMx6VUVSbdfsCJOp4KGaHdgdG+Gh5F0/87UNzoySa8q0yGYAVfdm qeBBAkBI/fywiXta2htr20/kXTHMKf028valybkCJkrvluja08Wbp2XfBKfD5ci8 teBkKTvcQyo0+rmwk5KcTkgvXzwBAkAvf2qL5exW5fBfg4x4G01CS28GAxMXgQai DI3Xx7AvFTDXxGY3f86hgwqeBz1br3/stcZU+kIZVTFHRTLlqAGBAkAZRre5XdRM YFLFtu0gj701GaUVOH4SxqY/+I8SsKv6mYiizwa9furbhuRi9V11e7iHAtqmVevB OM1oCzXDf3Qh -----END PRIVATE KEY-----
至此,可用的密钥对已经生成好了,私钥使用pkcs8_rsa_private_key.pem,公钥采用rsa_public_key.pem。
最近又遇到RSA加密的需求了,而且对方要求只能使用第一步生成的未经过PKCS#8编码的私钥文件。后来查看相关文献得知第一步生成的私钥文件编码是PKCS#1格式,这种格式Java其实是支持的,只不过多写两行代码而已:
RSAPrivateKeyStructure asn1PrivKey = new RSAPrivateKeyStructure((ASN1Sequence) ASN1Sequence.fromByteArray(priKeyData)); RSAPrivateKeySpec rsaPrivKeySpec = new RSAPrivateKeySpec(asn1PrivKey.getModulus(), asn1PrivKey.getPrivateExponent()); KeyFactory keyFactory= KeyFactory.getInstance("RSA"); PrivateKey priKey= keyFactory.generatePrivate(rsaPrivKeySpec);
首先将PKCS#1的私钥文件读取出来(注意去掉减号开头的注释内容),然后使用Base64解码读出的字符串,便得到priKeyData,也就是第一行代码中的参数。最后一行得到了私钥。接下来的用法就没什么区别了。
二、编写Java代码实际测试
RSA加密解密类:
1 import java.io.BufferedReader; 2 import java.io.BufferedWriter; 3 import java.io.FileReader; 4 import java.io.FileWriter; 5 import java.io.IOException; 6 import java.security.InvalidKeyException; 7 import java.security.KeyFactory; 8 import java.security.KeyPair; 9 import java.security.KeyPairGenerator; 10 import java.security.NoSuchAlgorithmException; 11 import java.security.SecureRandom; 12 13 import java.security.interfaces.RSAPrivateKey; 14 import java.security.interfaces.RSAPublicKey; 15 import java.security.spec.InvalidKeySpecException; 16 import java.security.spec.PKCS8EncodedKeySpec; 17 import java.security.spec.X509EncodedKeySpec; 18 19 import javax.crypto.BadPaddingException; 20 import javax.crypto.Cipher; 21 import javax.crypto.IllegalBlockSizeException; 22 import javax.crypto.NoSuchPaddingException; 23 24 import org.apache.commons.codec.binary.Base64; 25 26 public class RSAEncrypt { 27 /** 28 * 字节数据转字符串专用集合 29 */ 30 private static final char[] HEX_CHAR = { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, 31 ‘7‘, ‘8‘, ‘9‘, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘ }; 32 33 /** 34 * 随机生成密钥对 35 */ 36 public static void genKeyPair(String filePath) { 37 // KeyPairGenerator类用于生成公钥和私钥对,基于RSA算法生成对象 38 KeyPairGenerator keyPairGen = null; 39 try { 40 keyPairGen = KeyPairGenerator.getInstance("RSA"); 41 } catch (NoSuchAlgorithmException e) { 42 e.printStackTrace(); 43 } 44 // 初始化密钥对生成器,密钥大小为96-1024位 45 keyPairGen.initialize(1024,new SecureRandom()); 46 // 生成一个密钥对,保存在keyPair中 47 KeyPair keyPair = keyPairGen.generateKeyPair(); 48 // 得到私钥 49 RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); 50 // 得到公钥 51 RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); 52 try { 53 // 得到公钥字符串 54 Base64 base64 = new Base64(); 55 String publicKeyString = new String(base64.encode(publicKey.getEncoded())); 56 // 得到私钥字符串 57 String privateKeyString = new String(base64.encode(privateKey.getEncoded())); 58 // 将密钥对写入到文件 59 FileWriter pubfw = new FileWriter(filePath + "/publicKey.keystore"); 60 FileWriter prifw = new FileWriter(filePath + "/privateKey.keystore"); 61 BufferedWriter pubbw = new BufferedWriter(pubfw); 62 BufferedWriter pribw = new BufferedWriter(prifw); 63 pubbw.write(publicKeyString); 64 pribw.write(privateKeyString); 65 pubbw.flush(); 66 pubbw.close(); 67 pubfw.close(); 68 pribw.flush(); 69 pribw.close(); 70 prifw.close(); 71 } catch (Exception e) { 72 e.printStackTrace(); 73 } 74 } 75 76 /** 77 * 从文件中输入流中加载公钥 78 * 79 * @param in 80 * 公钥输入流 81 * @throws Exception 82 * 加载公钥时产生的异常 83 */ 84 public static String loadPublicKeyByFile(String path) throws Exception { 85 try { 86 BufferedReader br = new BufferedReader(new FileReader(path 87 + "/publicKey.keystore")); 88 String readLine = null; 89 StringBuilder sb = new StringBuilder(); 90 while ((readLine = br.readLine()) != null) { 91 sb.append(readLine); 92 } 93 br.close(); 94 return sb.toString(); 95 } catch (IOException e) { 96 throw new Exception("公钥数据流读取错误"); 97 } catch (NullPointerException e) { 98 throw new Exception("公钥输入流为空"); 99 } 100 } 101 102 /** 103 * 从字符串中加载公钥 104 * 105 * @param publicKeyStr 106 * 公钥数据字符串 107 * @throws Exception 108 * 加载公钥时产生的异常 109 */ 110 public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr) 111 throws Exception { 112 try { 113 Base64 base64 = new Base64(); 114 byte[] buffer = base64.decode(publicKeyStr); 115 KeyFactory keyFactory = KeyFactory.getInstance("RSA"); 116 X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer); 117 return (RSAPublicKey) keyFactory.generatePublic(keySpec); 118 } catch (NoSuchAlgorithmException e) { 119 throw new Exception("无此算法"); 120 } catch (InvalidKeySpecException e) { 121 throw new Exception("公钥非法"); 122 } catch (NullPointerException e) { 123 throw new Exception("公钥数据为空"); 124 } 125 } 126 127 /** 128 * 从文件中加载私钥 129 * 130 * @param keyFileName 131 * 私钥文件名 132 * @return 是否成功 133 * @throws Exception 134 */ 135 public static String loadPrivateKeyByFile(String path) throws Exception { 136 try { 137 BufferedReader br = new BufferedReader(new FileReader(path 138 + "/privateKey.keystore")); 139 String readLine = null; 140 StringBuilder sb = new StringBuilder(); 141 while ((readLine = br.readLine()) != null) { 142 sb.append(readLine); 143 } 144 br.close(); 145 return sb.toString(); 146 } catch (IOException e) { 147 throw new Exception("私钥数据读取错误"); 148 } catch (NullPointerException e) { 149 throw new Exception("私钥输入流为空"); 150 } 151 } 152 153 public static RSAPrivateKey loadPrivateKeyByStr(String privateKeyStr) 154 throws Exception { 155 try { 156 Base64 base64 = new Base64(); 157 byte[] buffer = base64.decode(privateKeyStr); 158 PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer); 159 KeyFactory keyFactory = KeyFactory.getInstance("RSA"); 160 return (RSAPrivateKey) keyFactory.generatePrivate(keySpec); 161 } catch (NoSuchAlgorithmException e) { 162 throw new Exception("无此算法"); 163 } catch (InvalidKeySpecException e) { 164 throw new Exception("私钥非法"); 165 } catch (NullPointerException e) { 166 throw new Exception("私钥数据为空"); 167 } 168 } 169 170 /** 171 * 公钥加密过程 172 * 173 * @param publicKey 174 * 公钥 175 * @param plainTextData 176 * 明文数据 177 * @return 178 * @throws Exception 179 * 加密过程中的异常信息 180 */ 181 public static byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData) 182 throws Exception { 183 if (publicKey == null) { 184 throw new Exception("加密公钥为空, 请设置"); 185 } 186 Cipher cipher = null; 187 try { 188 // 使用默认RSA 189 cipher = Cipher.getInstance("RSA"); 190 // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider()); 191 cipher.init(Cipher.ENCRYPT_MODE, publicKey); 192 byte[] output = cipher.doFinal(plainTextData); 193 return output; 194 } catch (NoSuchAlgorithmException e) { 195 throw new Exception("无此加密算法"); 196 } catch (NoSuchPaddingException e) { 197 e.printStackTrace(); 198 return null; 199 } catch (InvalidKeyException e) { 200 throw new Exception("加密公钥非法,请检查"); 201 } catch (IllegalBlockSizeException e) { 202 throw new Exception("明文长度非法"); 203 } catch (BadPaddingException e) { 204 throw new Exception("明文数据已损坏"); 205 } 206 } 207 208 /** 209 * 私钥加密过程 210 * 211 * @param privateKey 212 * 私钥 213 * @param plainTextData 214 * 明文数据 215 * @return 216 * @throws Exception 217 * 加密过程中的异常信息 218 */ 219 public static byte[] encrypt(RSAPrivateKey privateKey, byte[] plainTextData) 220 throws Exception { 221 if (privateKey == null) { 222 throw new Exception("加密私钥为空, 请设置"); 223 } 224 Cipher cipher = null; 225 try { 226 // 使用默认RSA 227 cipher = Cipher.getInstance("RSA"); 228 cipher.init(Cipher.ENCRYPT_MODE, privateKey); 229 byte[] output = cipher.doFinal(plainTextData); 230 return output; 231 } catch (NoSuchAlgorithmException e) { 232 throw new Exception("无此加密算法"); 233 } catch (NoSuchPaddingException e) { 234 e.printStackTrace(); 235 return null; 236 } catch (InvalidKeyException e) { 237 throw new Exception("加密私钥非法,请检查"); 238 } catch (IllegalBlockSizeException e) { 239 throw new Exception("明文长度非法"); 240 } catch (BadPaddingException e) { 241 throw new Exception("明文数据已损坏"); 242 } 243 } 244 245 /** 246 * 私钥解密过程 247 * 248 * @param privateKey 249 * 私钥 250 * @param cipherData 251 * 密文数据 252 * @return 明文 253 * @throws Exception 254 * 解密过程中的异常信息 255 */ 256 public static byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData) 257 throws Exception { 258 if (privateKey == null) { 259 throw new Exception("解密私钥为空, 请设置"); 260 } 261 Cipher cipher = null; 262 try { 263 // 使用默认RSA 264 cipher = Cipher.getInstance("RSA"); 265 // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider()); 266 cipher.init(Cipher.DECRYPT_MODE, privateKey); 267 byte[] output = cipher.doFinal(cipherData); 268 return output; 269 } catch (NoSuchAlgorithmException e) { 270 throw new Exception("无此解密算法"); 271 } catch (NoSuchPaddingException e) { 272 e.printStackTrace(); 273 return null; 274 } catch (InvalidKeyException e) { 275 throw new Exception("解密私钥非法,请检查"); 276 } catch (IllegalBlockSizeException e) { 277 throw new Exception("密文长度非法"); 278 } catch (BadPaddingException e) { 279 throw new Exception("密文数据已损坏"); 280 } 281 } 282 283 /** 284 * 公钥解密过程 285 * 286 * @param publicKey 287 * 公钥 288 * @param cipherData 289 * 密文数据 290 * @return 明文 291 * @throws Exception 292 * 解密过程中的异常信息 293 */ 294 public static byte[] decrypt(RSAPublicKey publicKey, byte[] cipherData) 295 throws Exception { 296 if (publicKey == null) { 297 throw new Exception("解密公钥为空, 请设置"); 298 } 299 Cipher cipher = null; 300 try { 301 // 使用默认RSA 302 cipher = Cipher.getInstance("RSA"); 303 // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider()); 304 cipher.init(Cipher.DECRYPT_MODE, publicKey); 305 byte[] output = cipher.doFinal(cipherData); 306 return output; 307 } catch (NoSuchAlgorithmException e) { 308 throw new Exception("无此解密算法"); 309 } catch (NoSuchPaddingException e) { 310 e.printStackTrace(); 311 return null; 312 } catch (InvalidKeyException e) { 313 throw new Exception("解密公钥非法,请检查"); 314 } catch (IllegalBlockSizeException e) { 315 throw new Exception("密文长度非法"); 316 } catch (BadPaddingException e) { 317 throw new Exception("密文数据已损坏"); 318 } 319 } 320 321 /** 322 * 字节数据转十六进制字符串 323 * 324 * @param data 325 * 输入数据 326 * @return 十六进制内容 327 */ 328 public static String byteArrayToString(byte[] data) { 329 StringBuilder stringBuilder = new StringBuilder(); 330 for (int i = 0; i < data.length; i++) { 331 // 取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移 332 stringBuilder.append(HEX_CHAR[(data[i] & 0xf0) >>> 4]); 333 // 取出字节的低四位 作为索引得到相应的十六进制标识符 334 stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]); 335 if (i < data.length - 1) { 336 stringBuilder.append(‘ ‘); 337 } 338 } 339 return stringBuilder.toString(); 340 } 341 }
签名及校验类:
1 import java.security.KeyFactory; 2 import java.security.PrivateKey; 3 import java.security.PublicKey; 4 import java.security.spec.PKCS8EncodedKeySpec; 5 import java.security.spec.X509EncodedKeySpec; 6 7 import org.apache.commons.codec.binary.Base64; 8 9 /** 10 * RSA签名验签类 11 */ 12 public class RSASignature { 13 14 /** 15 * 签名算法 16 */ 17 public static final String SIGN_ALGORITHMS = "SHA1WithRSA"; 18 19 /** 20 * RSA签名 21 * 22 * @param content 23 * 待签名数据 24 * @param privateKey 25 * 商户私钥 26 * @param encode 27 * 字符集编码 28 * @return 签名值 29 */ 30 public static String sign(String content, String privateKey, String encode) { 31 try { 32 Base64 base64 = new Base64(); 33 PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(base64.decode(privateKey)); 34 35 KeyFactory keyf = KeyFactory.getInstance("RSA"); 36 PrivateKey priKey = keyf.generatePrivate(priPKCS8); 37 38 java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS); 39 40 signature.initSign(priKey); 41 signature.update(content.getBytes(encode)); 42 43 byte[] signed = signature.sign(); 44 45 return new String(base64.encode(signed)); 46 } catch (Exception e) { 47 e.printStackTrace(); 48 } 49 50 return null; 51 } 52 53 public static String sign(String content, String privateKey) { 54 try { 55 Base64 base64 = new Base64(); 56 PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(base64.decode(privateKey)); 57 KeyFactory keyf = KeyFactory.getInstance("RSA"); 58 PrivateKey priKey = keyf.generatePrivate(priPKCS8); 59 java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS); 60 signature.initSign(priKey); 61 signature.update(content.getBytes()); 62 byte[] signed = signature.sign(); 63 return new String(base64.encode(signed)); 64 } catch (Exception e) { 65 e.printStackTrace(); 66 } 67 return null; 68 } 69 70 /** 71 * RSA验签名检查 72 * 73 * @param content 74 * 待签名数据 75 * @param sign 76 * 签名值 77 * @param publicKey 78 * 分配给开发商公钥 79 * @param encode 80 * 字符集编码 81 * @return 布尔值 82 */ 83 public static boolean doCheck(String content, String sign, String publicKey, String encode) { 84 try { 85 KeyFactory keyFactory = KeyFactory.getInstance("RSA"); 86 Base64 base64 = new Base64(); 87 byte[] encodedKey = base64.decode(publicKey); 88 PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey)); 89 90 java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS); 91 92 signature.initVerify(pubKey); 93 signature.update(content.getBytes(encode)); 94 95 boolean bverify = signature.verify(base64.decode(sign)); 96 return bverify; 97 98 } catch (Exception e) { 99 e.printStackTrace(); 100 } 101 102 return false; 103 } 104 105 public static boolean doCheck(String content, String sign, String publicKey) { 106 try { 107 KeyFactory keyFactory = KeyFactory.getInstance("RSA"); 108 Base64 base64 = new Base64(); 109 byte[] encodedKey = base64.decode(publicKey); 110 PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey)); 111 112 java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS); 113 114 signature.initVerify(pubKey); 115 signature.update(content.getBytes()); 116 117 boolean bverify = signature.verify(base64.decode(sign)); 118 return bverify; 119 120 } catch (Exception e) { 121 e.printStackTrace(); 122 } 123 124 return false; 125 } 126 127 }
最后是一个MainTest:
1 import org.apache.commons.codec.binary.Base64; 2 3 public class MainTest { 4 5 public static void main(String[] args) throws Exception { 6 String filepath = "G:/tmp/"; 7 8 // RSAEncrypt.genKeyPair(filepath); 9 10 Base64 base64 = new Base64(); 11 12 System.out.println("--------------公钥加密私钥解密过程-------------------"); 13 String plainText = "ihep_公钥加密私钥解密"; 14 // 公钥加密过程 15 byte[] cipherData =http://www.mamicode.com/ RSAEncrypt.encrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath)), 16 plainText.getBytes()); 17 String cipher = new String(base64.encode(cipherData)); 18 // 私钥解密过程 19 byte[] res = RSAEncrypt.decrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)), 20 base64.decode(cipher)); 21 String restr = new String(res); 22 System.out.println("原文:" + plainText); 23 System.out.println("加密:" + cipher); 24 System.out.println("解密:" + restr); 25 System.out.println(); 26 27 System.out.println("--------------私钥加密公钥解密过程-------------------"); 28 plainText = "ihep_私钥加密公钥解密"; 29 // 私钥加密过程 30 cipherData =http://www.mamicode.com/ RSAEncrypt.encrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)), 31 plainText.getBytes()); 32 cipher = new String(base64.encode(cipherData)); 33 // 公钥解密过程 34 res = RSAEncrypt.decrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath)), 35 base64.decode(cipher)); 36 restr = new String(res); 37 System.out.println("原文:" + plainText); 38 System.out.println("加密:" + cipher); 39 System.out.println("解密:" + restr); 40 System.out.println(); 41 42 System.out.println("---------------私钥签名过程------------------"); 43 String content = "ihep_这是用于签名的原始数据"; 44 String signstr = RSASignature.sign(content, RSAEncrypt.loadPrivateKeyByFile(filepath)); 45 System.out.println("签名原串:" + content); 46 System.out.println("签名串:" + signstr); 47 System.out.println(); 48 49 System.out.println("---------------公钥校验签名------------------"); 50 System.out.println("签名原串:" + content); 51 System.out.println("签名串:" + signstr); 52 53 System.out.println("验签结果:" + RSASignature.doCheck(content, signstr, RSAEncrypt.loadPublicKeyByFile(filepath))); 54 System.out.println(); 55 56 } 57 }
参考:
http://blog.csdn.net/chaijunkun/article/details/7275632
http://blog.csdn.net/wangqiuyun/article/details/42143957
Java中使用OpenSSL生成的RSA公私钥