使用PKCS7Padding的AES CBC加密在Java和Objective中有不同的结果
我用Java为Android创建了一个应用程序，并使用Cipher类用AES加密数据。现在我想用CommonCrypto类将该算法引入iOS。代码可以工作，但有不同的结果
这是Java中的代码：
public static String Decrypt(String text, String key) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
byte[] keyBytes = new byte[16];
byte[] b = key.getBytes("UTF-8");
int len = b.length;
if (len > keyBytes.length)
len = keyBytes.length;
System.arraycopy(b, 0, keyBytes, 0, len);
SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(keyBytes);
cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
byte[] results = new byte[text.length()];
BASE64Decoder decoder = new BASE64Decoder();
try {
results = cipher.doFinal(decoder.decodeBuffer(text));
} catch (Exception e) {
System.out.print("Erron in Decryption");
}
return new String(results, "UTF-8");
}
public static String Encrypt(String text, String key) throws Exception {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
byte[] keyBytes = new byte[16];
byte[] b = key.getBytes("UTF-8");
int len = b.length;
if (len > keyBytes.length)
len = keyBytes.length;
System.arraycopy(b, 0, keyBytes, 0, len);
SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(keyBytes);
System.out.println(keyBytes);
System.out.println(keySpec);
System.out.println(ivSpec);
cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
byte[] results = cipher.doFinal(text.getBytes("UTF-8"));
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(results);
}
这是Objective-C中的代码：
+ (NSString*)AES256EncryptData:(NSString*)data WithKey:(NSString*)key {
char keyPtr[kCCKeySizeAES128]; // 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 = data.length;
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) */,
data.UTF8String, dataLength, /* input */
buffer, bufferSize, /* output */
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
return [[NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted] base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithCarriageReturn];
}
free(buffer); //free the buffer;
return nil;
}
+ (NSString*)AES256DecryptData:(NSString*)data WithKey:(NSString*)key {
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 = data.length;
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) */,
data.UTF8String, dataLength, /* input */
buffer, bufferSize, /* output */
&numBytesDecrypted);
if (cryptStatus == kCCSuccess) {
return [[NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted] base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithCarriageReturn];
}
free(buffer); //free the buffer;
return nil;
}
更新1:
数据：text to encrypt
键：testkey
Java（所需）结果：7ptTEyImNz9KgC96+JPFXQ==
目的-C结果：U7FAVHi01q0Hhf+m9NsKjw==
# 1 楼答案
在java代码中，您使用的是一个IV参数：
在目标C中，IV参数设置为空：
除此之外，IV参数应该是一些随机值，而不是您的密钥（或部分密钥）。其思想是输出不同的密码文本并防止块模式匹配
# 2 楼答案
您需要向ObjC代码中添加一个iv，而不是NULL
不要为iv使用密钥，而是创建一个随机字节的iv，将其预先添加到加密数据以用于解密。在ObjC中，您可以使用
SecRandomCopyBytes创建随机iv：输出：
# 3 楼答案
您的问题在于Objective-C代码。您应该在Java和Obj-C中使用相同的方法。您可以使用此代码使其返回相同的结果：
AES。h
AES。m