如何在iOS中解密DES加密字符串？

Question

我使用PHP在DES算法中使用PKCS＃7填充字符串進行加密。

我想知道如何在iOS中使用CCCrypt來解密DES加密字符串。欣賞它，如果你能提供一些示例代碼來幫助我。

謝謝。

Answer 1

- (NSData *)encryptDESByKey:(NSData *)key data:(NSData *)data 
{ 
size_t numBytesEncrypted = 0; 
size_t bufferSize = data.length + kCCBlockSizeDES; 
void *buffer = malloc(bufferSize); 

CCCryptorStatus result = CCCrypt(kCCEncrypt, kCCAlgorithmDES, kCCOptionPKCS7Padding, 
           key.bytes, kCCKeySizeDES, 
           NULL, 
           data.bytes, data.length, 
           buffer, bufferSize, 
           &numBytesEncrypted); 
NSData *output = [NSData dataWithBytes:buffer length:numBytesEncrypted]; 
free(buffer); 
if(result == kCCSuccess) 
{ 
    NSLog(@"encoded str %@",[output base64EncodedStringWithOptions:0]); 
    return output; 
} else { 
    NSLog(@"Failed DES encrypt..."); 
    return nil; 
} 
} 
- (NSData *) decryptDESByKey:(NSData *)key data:(NSData *)data 
{ 
size_t numBytesEncrypted = 0; 

size_t bufferSize = data.length + kCCBlockSizeDES; 
void *buffer_decrypt = malloc(bufferSize); 
CCCryptorStatus result = CCCrypt(kCCDecrypt , kCCAlgorithmDES, kCCOptionPKCS7Padding, 
           key.bytes, kCCKeySizeDES, 
           NULL, 
           data.bytes, data.length, 
           buffer_decrypt, bufferSize, 
           &numBytesEncrypted); 

NSData *output = [NSData dataWithBytes:buffer_decrypt length:numBytesEncrypted]; 
free(buffer_decrypt); 
if(result == kCCSuccess) 
{ 
    NSString *decodedString = [[NSString alloc] initWithData:output encoding:NSUTF8StringEncoding]; 
    NSLog(@"decoded str %@",decodedString); 
    return output; 
} else { 
    NSLog(@"Failed DES decrypt ..."); 
    return nil; 
} 
} 

- 然後你就可以調用方法一樣

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