Java服务端与iOS通信 DES加密方式兼容解析

阐述Java服务端DES加解密规则， 可兼容iOS自带DES加密方式

先定义其加密参数规则，如下：

private static final String KEY_ALGORITHM = "DES";

private static final String CIPHER_TRANSFORMATION = "DES/CBC/PKCS5Padding";

private static final String CHARSET = "UTF-8";private static final byte[] SPECIFICATION = { 1, 2, 3, 4, 5, 6, 7, 8 };

加密方式：

try {

byte[] data = content.getBytes(CHARSET);

IvParameterSpec parameterSpec = new IvParameterSpec(SPECIFICATION);

SecretKeySpec sKey = new SecretKeySpec(key.getBytes(),

KEY_ALGORITHM);

Cipher cipher = Cipher.getInstance(CIPHER_TRANSFORMATION);

cipher.init(Cipher.ENCRYPT_MODE, sKey, parameterSpec);

byte[] results = cipher.doFinal(data);

return Base64.encode(results);

} catch (Throwable t) {

t.printStackTrace();

} 

解密方式：

try {

byte[] prepares = Base64.decode(content);

IvParameterSpec parameterSpec = new IvParameterSpec(SPECIFICATION);

SecretKeySpec sKey = new SecretKeySpec(key.getBytes(),

KEY_ALGORITHM);

Cipher cipher = Cipher.getInstance(CIPHER_TRANSFORMATION);

cipher.init(Cipher.DECRYPT_MODE, sKey, parameterSpec);

byte[] results = cipher.doFinal(prepares);

return new String(results, CHARSET);

} catch (Throwable t) {

t.printStackTrace();

}

这里的SPECIFICATION数组长度为8