androidRSA加密

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 KeySize,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;