原文:
iOS，Android，.NET通用AES加密算法
这两天为移动App开发API，结果实现加密验证时碰到一大坑。这里不得不吐槽下又臭又硬的iOS，Windows Server无法解密出正确的结果，Android则可以，后来使用了通用的AES256加密算法才最终搞定。
搞服务器端小伙伴没有接触过iOS，所以也没料到过这种情形。他使用了AES128 with IV的加密算法，Android端可以顺利通过加密验证。
但是iOS端使用AES128算法后出现问题，虽然可以在本地加密解密，但是无法被服务器解密成功。
后来经过多方查找，才了解到一个蛋疼的事实，iOS只支持AES PKCS7Padding算法，在服务器端修改为响应算法后，顺利通过。
这里主要参考一篇博文，以下给出通用AES算法：
Objective-C:
//头文件
#import <Foundation/Foundation.h> @interface NSData (AES) - (NSData *)AES256EncryptWithKey:(NSString *)key; - (NSData *)AES256DecryptWithKey:(NSString *)key; @end
实现代码：
#import "NSData+AES256.h" #import <CommonCrypto/CommonCryptor.h> @implementation NSData (AES) -(NSData *)AES256EncryptWithKey:(NSString *)key { // 'key' should be 32 bytes for AES256, will be null-padded otherwise char keyPtr[kCCKeySizeAES256+1]; // room for terminator (unused) bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding) // fetch key data [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding]; NSUInteger dataLength = [self length]; //See the doc: For block ciphers, the output size will always be less than or //equal to the input size plus the size of one block. //That's why we need to add the size of one block here size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize); size_t numBytesEncrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, keyPtr, kCCKeySizeAES256, NULL /* initialization vector (optional) */, [self bytes], dataLength, /* input */ buffer, bufferSize, /* output */ &numBytesEncrypted); if (cryptStatus == kCCSuccess) { //the returned NSData takes ownership of the buffer and will free it on deallocation return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted]; } free(buffer); //free the buffer; return nil;} -(NSData *)AES256DecryptWithKey:(NSString *)key { // 'key' should be 32 bytes for AES256, will be null-padded otherwise char keyPtr[kCCKeySizeAES256+1]; // room for terminator (unused) bzero(keyPtr, sizeof(keyPtr)); // fill with zeroes (for padding) // fetch key data [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding]; NSUInteger dataLength = [self length]; //See the doc: For block ciphers, the output size will always be less than or //equal to the input size plus the size of one block. //That's why we need to add the size of one block here size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize); size_t numBytesDecrypted = 0; CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, keyPtr, kCCKeySizeAES256, NULL /* initialization vector (optional) */, [self bytes], dataLength, /* input */ buffer, bufferSize, /* output */ &numBytesDecrypted); if (cryptStatus == kCCSuccess) { //the returned NSData takes ownership of the buffer and will free it on deallocation return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted]; } free(buffer); //free the buffer; return nil; } @end
C#：
#region /// <summary> /// 256位AES加密 /// </summary> /// <param name="toEncrypt"></param> /// <returns></returns> public static string Encrypt(string toEncrypt) { // 256-AES key byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key); byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt); RijndaelManaged rDel = new RijndaelManaged(); rDel.Key = keyArray; rDel.Mode = CipherMode.ECB; rDel.Padding = PaddingMode.PKCS7; ICryptoTransform cTransform = rDel.CreateEncryptor(); byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length); return Convert.ToBase64String(resultArray, 0, resultArray.Length); } /// <summary> /// 256位AES解密 /// </summary> /// <param name="toDecrypt"></param> /// <returns></returns> public static string Decrypt(string toDecrypt) { // 256-AES key byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key); byte[] toEncryptArray = Convert.FromBase64String(toDecrypt); RijndaelManaged rDel = new RijndaelManaged(); rDel.Key = keyArray; rDel.Mode = CipherMode.ECB; rDel.Padding = PaddingMode.PKCS7; ICryptoTransform cTransform = rDel.CreateDecryptor(); byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length); return UTF8Encoding.UTF8.GetString(resultArray); } #endregion
Java：
import java.io.UnsupportedEncodingException; import java.security.InvalidAlgorithmParameterException; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.util.Arrays; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.NoSuchPaddingException; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import android.util.Base64; public class AESUtils { /** * 加密 * @param content 需要加密的内容 * @param password 加密密码 * @return */ private static String Key="GcA*23jKJf0df09Osf09834ljlJF0920"; public static String encode(String stringToEncode) throws NullPointerException { try { SecretKeySpec skeySpec = getKey(Key); byte[] clearText = stringToEncode.getBytes("UTF8"); final byte[] iv = new byte[16]; Arrays.fill(iv, (byte) 0x00); IvParameterSpec ivParameterSpec = new IvParameterSpec(iv); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivParameterSpec); String encrypedValue = Base64.encodeToString(cipher.doFinal(clearText), Base64.DEFAULT); return encrypedValue; } catch (InvalidKeyException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (InvalidAlgorithmParameterException e) { e.printStackTrace(); } return ""; } private static SecretKeySpec getKey(String password) throws UnsupportedEncodingException { int keyLength = 256; byte[] keyBytes = new byte[keyLength / 8]; Arrays.fill(keyBytes, (byte) 0x0); byte[] passwordBytes = password.getBytes("UTF-8"); int length = passwordBytes.length < keyBytes.length ? passwordBytes.length : keyBytes.length; System.arraycopy(passwordBytes, 0, keyBytes, 0, length); SecretKeySpec key = new SecretKeySpec(keyBytes, "AES"); return key; } }
