我正致力于将Objective-C Code转换为Swift。在这里，我们发现Swift中没有 CommonCrypto 。
因此，我们在令人兴奋的Swift项目中使用映射来执行module.map文件并访问Common Crypto文件。我在下面写了Objective-C到Swift的代码。
但是我在代码转换方面遇到了问题。下面我写了两种语言代码。 请注意，此SWIFT代码包含错误 。 不完美。请帮我解决Swift语言代码。
Objective-C代码：
- (NSData *) hashKey:(NSString *)hash{
unsigned char result[1000];
const char *cStr = [hash UTF8String];
CC_MD5(cStr, (CC_LONG)strlen(cStr), result);
for (int jval = 0, kval = 16; jval < 8;) {
result[kval++] = result[jval++];
}
return [NSMutableData dataWithBytes:result length:24];;
}
- (NSData *) myEncrypt:(NSString *)encryptData{
NSData *myKeyData = [self hashKey:MySecretKey];
NSData *myRawData = [encryptData dataUsingEncoding:NSUTF8StringEncoding];
size_t buffer_size = [myRawData length] + kCCBlockSize3DES;
void* buffer = malloc(buffer_size);
size_t num_bytes_encrypted = 0;
uint8_t iv[8] = { 56, 101, 63, 23, 96, 182, 209, 205};
CCCryptorStatus Crypto_status = CCCrypt(kCCEncrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding,
[myKeyData bytes],
kCCKeySize3DES,
iv,
[myRawData bytes],
[myRawData length],
buffer,
buffer_size,
&num_bytes_encrypted);
if (Crypto_status == kCCSuccess){
NSData *myResult = [NSData dataWithBytes:buffer length:num_bytes_encrypted];
free(buffer);
return myResult;
}
else {
free(buffer);
return nil;
}
}
- (NSData *) myDecrypt:(NSData *)decryptData{
NSUInteger mydata_len = [decryptData length];
NSData *keyData = [self hashKey:MySecretKey];
size_t buffer_size = mydata_len + kCCBlockSizeAES128;
void* buffer = malloc(buffer_size);
size_t num_bytes_encrypted = 0;
uint8_t iv[8] = { 56, 101, 63, 23, 96, 182, 209, 205};
CCCryptorStatus decrypt_status = CCCrypt(kCCDecrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding,
[keyData bytes],
kCCKeySize3DES,
iv,
[decryptData bytes],
mydata_len,
buffer,
buffer_size,
&num_bytes_encrypted);
if (decrypt_status == kCCSuccess){
NSData *myResult = [NSData dataWithBytes:buffer length:num_bytes_encrypted];
free(buffer);
return myResult;
}
else {
free(buffer);
return nil;
}
}
Swift代码：
func hashKey(hash:String) -> NSData{
let digestLength = Int(CC_MD5_DIGEST_LENGTH)
let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLength)
var cStr = hash.cStringUsingEncoding(NSUTF8StringEncoding)
var strLen = CC_LONG(strlen(cStr!))
CC_MD5(cStr!, strLen, result)
var kval = 16
for (var jval=0; kval==16; jval<8){
result [kval++] = result[jval++] ***//Here We Got An Error: Cannot assign a value of type 'CUnsignedChar' to a value of type '[Int]'***
}
return NSMutableData(bytes: result, length: 24)
}
func myEncrypt(encryptData:String) -> NSData?{
var myKeyData : NSData = self.hashKey(MySecretKey)
var myRawData : NSData = encryptData.dataUsingEncoding(NSUTF8StringEncoding)!
var buffer_size : size_t = myRawData.length + kCCBlockSize3DES
var buffer = UnsafeMutablePointer<NSData>.alloc(buffer_size)
var num_bytes_encrypted : size_t = 0
var iv : [UInt8] = [56, 101, 63, 23, 96, 182, 209, 205]
let operation: CCOperation = UInt32(kCCEncrypt)
let algoritm: CCAlgorithm = UInt32(kCCAlgorithm3DES)
let options: CCOptions = UInt32(kCCOptionPKCS7Padding)
let keyLength = size_t(kCCKeySize3DES)
var Crypto_status: CCCryptorStatus = CCCrypt(operation, algoritm, options, myKeyData.bytes, keyLength, iv, myRawData.bytes, myRawData.length, buffer, buffer_size, &num_bytes_encrypted)
if UInt32(Crypto_status) == UInt32(kCCSuccess){
var myResult: NSData = NSData(bytes: buffer, length: num_bytes_encrypted)
free(buffer)
return myResult
}else{
free(buffer)
return nil
}
}
func myDecrypt(decryptData : NSData) -> NSData?{
var mydata_len : Int = decryptData.length
var keyData : NSData = self.hashKey(MySecretKey)
var buffer_size : size_t = mydata_len+kCCBlockSizeAES128
var buffer = UnsafeMutablePointer<NSData>.alloc(buffer_size)
var num_bytes_encrypted : size_t = 0
var iv : [UInt8] = [56, 101, 63, 23, 96, 182, 209, 205]
let operation: CCOperation = UInt32(kCCDecrypt)
let algoritm: CCAlgorithm = UInt32(kCCAlgorithm3DES)
let options: CCOptions = UInt32(kCCOptionPKCS7Padding)
let keyLength = size_t(kCCKeySize3DES)
var decrypt_status : CCCryptorStatus = CCCrypt(operation, algoritm, options, keyData.bytes, keyLength, iv, decryptData.bytes, mydata_len, buffer, buffer_size, &num_bytes_encrypted)
if UInt32(decrypt_status) == UInt32(kCCSuccess){
var myResult : NSData = NSData(bytes: buffer, length: num_bytes_encrypted)
free(buffer)
return myResult
}else{
free(buffer)
return nil
}
}
答案 0 :(得分：3)
for (var jval=0; kval==16; jval<8){
return [kval++] = result[jval++] ***//Here We Got An Error: Cannot assign a value of type 'CUnsignedChar' to a value of type '[Int]'***
}
正如@Francisco所说，这是不正确的。你试图在循环中间返回。这是一个明显的错字。您的意思是result[kval++]而不是return [kval++]。
但还有另一个问题。您修改了for循环。那是：
for (int jval = 0, kval = 16; jval < 8;) {
在Swift中基本相同：
for var jval = 0, kval = 0; jval < 8; {
答案 1 :(得分：1)
Swift 2.0
添加Security.framework
#import <CommonCrypto/CommonCrypto.h> (in bridging header)
示例md5方法：
func mac_md5(string string: String) -> (NSData?) {
let data = (dataString as NSString).dataUsingEncoding(NSUTF8StringEncoding) as NSData!
let result = NSMutableData(length: Int(CC_MD5_DIGEST_LENGTH))!
if (data.length > 0) {
CC_MD5(data.bytes,
CC_LONG(data.length),
UnsafeMutablePointer<UInt8>(result.mutableBytes))
}
return result
}
测试：
let dataString = "Here is the data longer"
var mac = mac_md5(string:dataString) as! NSMutableData
print("mac: \(mac)")
输出：
mac: <e3b741ae cadf6725 03e3c95c 9d88a9a6>
问题末尾的代码是复制前16个字节末尾的前8个字节，创建一个24字节的3DES密钥（又名2TDEA）。这主要见于在加密方法中实现DES和3DES兼容性的应用程序。
示例代码：
mac.appendData(mac.subdataWithRange(NSMakeRange(0, 8)))
println("mac: \(mac)")
输出：
mac: <e3b741ae cadf6725 03e3c95c 9d88a9a6 e3b741ae cadf6725>
示例3DES方法：
func testCrypt3DES(data data:NSData, keyData:NSData, ivData:NSData, operation:CCOperation) -> NSData? {
let keyBytes = UnsafePointer<UInt8>(keyData.bytes)
let ivBytes = UnsafePointer<UInt8>(ivData.bytes)
let dataLength = Int(data.length)
let dataBytes = UnsafePointer<UInt8>(data.bytes)
let cryptData: NSMutableData! = NSMutableData(length: Int(dataLength) + kCCBlockSize3DES)
let cryptPointer = UnsafeMutablePointer<UInt8>(cryptData.mutableBytes)
let cryptLength = size_t(cryptData.length)
let keyLength = size_t(kCCKeySize3DES)
let algoritm: CCAlgorithm = UInt32(kCCAlgorithm3DES)
let options: CCOptions = UInt32(kCCOptionPKCS7Padding)
var numBytesEncrypted :size_t = 0
let cryptStatus = CCCrypt(operation,
algoritm,
options,
keyBytes, keyLength,
ivBytes,
dataBytes, dataLength,
cryptPointer, cryptLength,
&numBytesEncrypted)
if UInt32(cryptStatus) == UInt32(kCCSuccess) {
cryptData.length = Int(numBytesEncrypted)
} else {
print("Error: \(cryptStatus)")
}
return cryptData;
//测试代码：
let keyString = "!Use a data key!"
let keyData = (keyString as NSString).dataUsingEncoding(NSUTF8StringEncoding) as NSData!
let ivString = "Use a iv"
let ivData = (keyString as NSString).dataUsingEncoding(NSUTF8StringEncoding) as NSData!
let message = "Don´t try to read this text. Top Secret Stuff"
let data = (message as NSString).dataUsingEncoding(NSUTF8StringEncoding) as NSData!
print("data: \(data)")
if let encryptedData = testCrypt3DES(data:data, keyData:keyData, ivData:ivData, operation:UInt32(kCCEncrypt)) {
print("encryptedData: \(encryptedData)")
if let decryptedData = testCrypt3DES(data:encryptedData, keyData:keyData, ivData:ivData, operation:UInt32(kCCDecrypt)) {
print("decryptedData: \(decryptedData)")
}
}
输出：
data: <446f6ec2 b4742074 72792074 6f207265 61642074 68697320 74657874 2e20546f 70205365 63726574 20537475 6666>
encryptedData: <b146c869 df2eec94 fd4656fd 02757e25 718cc32e 35c51907 31866a1c 99f8e2b9 de3ba203 41a49b0f 8fd5dc4c d7721333>
decryptedData: <446f6ec2 b4742074 72792074 6f207265 61642074 68697320 74657874 2e20546f 70205365 63726574 20537475 6666>
答案 2 :(得分：0)
我不确定你想做什么但是这个：
for (int jval = 0, kval = 16; jval < 8;) {
result[kval++] = result[jval++];
}
与此不一样：
for (var jval=0; kval==16; jval<8){
return [kval++] = result[jval++]
}
我想你想要做的是：
for (var jval=0; kval==16; jval<8){
result[kval++] = result[jval++]
}
在任何情况下，您都可以将CUnsignedChar（通过示例命名为var）转换为Int：
[String(var).toInt()!]
答案 3 :(得分：0)
使用Swiftify，我得到了以下代码：
func hashKey(hash: String) -> NSData {
var result: UInt8
let cStr: Character = hash.UTF8String()
CC_MD5(cStr, strlen(cStr), result)
for var jval = 0, kval = 16; jval < 8; {
result[kval++] = result[jval++]
}
return NSMutableData.dataWithBytes(result, length: 24)
}
func myEncrypt(encryptData: String) -> NSData {
var myKeyData: NSData = self.hashKey(MySecretKey)
var myRawData: NSData = encryptData.dataUsingEncoding(NSUTF8StringEncoding)
var buffer_size: size_t = myRawData.length() + kCCBlockSize3DES
var buffer: void = malloc(buffer_size)
var num_bytes_encrypted: size_t = 0
var iv: uint8_t = 56101632396182209205
var Crypto_status: CCCryptorStatus = CCCrypt(kCCEncrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding, myKeyData.bytes(), kCCKeySize3DES, iv, myRawData.bytes(), myRawData.length(), buffer, buffer_size, &num_bytes_encrypted)
if Crypto_status == kCCSuccess {
var myResult: NSData = NSData.dataWithBytes(buffer, length: num_bytes_encrypted)
free(buffer)
return myResult
}
else {
free(buffer)
return nil
}
}
func myDecrypt(decryptData: NSData) -> NSData {
var mydata_len: UInt = decryptData.length()
var keyData: NSData = self.hashKey(MySecretKey)
var buffer_size: size_t = mydata_len + kCCBlockSizeAES128
var buffer: void = malloc(buffer_size)
var num_bytes_encrypted: size_t = 0
var iv: uint8_t = 56101632396182209205
var decrypt_status: CCCryptorStatus = CCCrypt(kCCDecrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding, keyData.bytes(), kCCKeySize3DES, iv, decryptData.bytes(), mydata_len, buffer, buffer_size, &num_bytes_encrypted)
if decrypt_status == kCCSuccess {
var myResult: NSData = NSData.dataWithBytes(buffer, length: num_bytes_encrypted)
free(buffer)
return myResult
}
else {
free(buffer)
return nil
}
}
答案 4 :(得分：0)
我建议您使用CryptoSwift。它是用纯粹的快速写的。