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上传时间: 2015-10-30
详细说明： RSA封装类 ，完整的RSA加密和解密 public class RSAUtilEncrypt { public static final String KEY_ALGORTHM = "RSA";// public static final String KEY_ALGORTHM_RSA_ECB_PKCS1PADDING = "RSA/ECB/PKCS1Padding"; public static String RSA_PUBLIC_KEY = "rsa_public_key"; public static String RSA_PRIVATE_KEY = "rsa_private_key"; private int KeySize = 1024; private Map keyMap; private static String RSA = "RSA"; private static PublicKey publickey; public RSAUtilEncrypt(int KeySi ze,String publickey) { this.KeySize = KeySize; try { this.publickey=generatePublicKeyByString(publickey); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } private RSAPublicKey generatePublicKeyByString(String publicKeyStr) throws Exception { try { BASE64Decoder base64Decoder = new BASE64Decoder(); byte[] buffer = base64Decoder.decodeBuffer(publicKeyStr); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); return (RSAPublicKey) keyFactory.generatePublic(keySpec); } catch (NoSuchAlgorithmException e) { throw new Exception("No Algorthm,Checked by cemung!"); } catch (InvalidKeySpecException e) { throw new Exception("InvalidKeySpec!"); } catch (IOException e) { throw new Exception("Io exception!"); } catch (NullPointerException e) { throw new Exception("Illegle pointer reference!"); } } // Encypt public byte[] RSAEncrypt(byte[] data, RSAPublicKey publickey) throws Exception { Cipher cipher = Cipher.getInstance(KEY_ALGORTHM_RSA_ECB_PKCS1PADDING); cipher.init(Cipher.ENCRYPT_MODE, this.publickey); byte[] cipherbytes = cipher.doFinal(data); return cipherbytes; } // Encypt public byte[] RSAEncrypt(byte[] data) throws Exception { Cipher cipher = Cipher.getInstance(KEY_ALGORTHM_RSA_ECB_PKCS1PADDING); cipher.init(Cipher.ENCRYPT_MODE, this.publickey); byte[] cipherbytes = cipher.doFinal(data); return cipherbytes; } // Get Public key with format byte[] public byte[] getPublicKeyByte() { RSAPublicKey pubkey = (RSAPublicKey) keyMap.get(RSA_PUBLIC_KEY); return pubkey.getEncoded(); } public static byte[] decryptBASE64(String key) throws Exception { return (new BASE64Decoder()).decodeBuffer(key); } public static String encryptBASE64(byte[] key) throws Exception { return (new BASE64Encoder()).encodeBuffer(key); } public static byte[] decryptByPrivateKey(byte[] data, String key) throws Exception { byte[] keyBytes = decryptBASE64(key); PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec( keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORTHM); Key privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec); Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.DECRYPT_MODE, privateKey); return cipher.doFinal(data); } public static byte[] encryptByPublicKey(byte[] data, String key) throws Exception { byte[] keyBytes = decryptBASE64(key); X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORTHM); Key publicKey = keyFactory.generatePublic(x509EncodedKeySpec); Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.ENCRYPT_MODE, publicKey); return cipher.doFinal(data); } public static byte[] decryptByPublicKey(byte[] data, String key) throws Exception { byte[] keyBytes = decryptBASE64(key); X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORTHM); Key publicKey = keyFactory.generatePublic(x509EncodedKeySpec); Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.DECRYPT_MODE, publicKey); return cipher.doFinal(data); } 使用方法 private RSAUtilEncrypt rsa = new RSAUtilEncrypt(1024, publikey); /* * 给信息加密,获取密文 */ public String getCiphertext(String str_encrode) { try { byte[] estr = rsa.RSAEncrypt(str_encrode.getBytes()); // 密文 String ciphertext = Base64.encodeToString(estr, Base64.DEFAULT); return ciphertext; } catch (Exception e) { e.printStackTrace(); } return null; } 有疑问的留言 ...展开收缩
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