Objective-C AES 加解密

iOS AES加解密

hexToByte

{
    NSData* hexToBytes(NSString *hex) {
    NSMutableData* data = [NSMutableData data];
    unsigned int idx, intValue;
    for (idx = 0; idx+2 <= hex.length; idx+=2) {
        NSString* hexStr = [hex substringWithRange:NSMakeRange(idx, 2)];
        NSScanner* scanner = [NSScanner scannerWithString:hexStr];
        [scanner scanHexInt:&intValue];
        [data appendBytes:&intValue length:1];
    }
    return data;
}

parseByteToHexString

NSString *parseByte2HexString(NSData *dt){
    const unsigned char *dataBuffer = (const unsigned char *)[dt bytes];

    if (!dataBuffer){
        return @"";
    }

    NSUInteger dataLength = [dt length];
    NSMutableString *hexString = [NSMutableString stringWithCapacity:(dataLength * 2)];

    for (int i = 0; i < dataLength; ++i){
        [hexString appendFormat:@"%02x", (unsigned int)dataBuffer[i]];
    }
    DLog(@"hexString==%@",hexString);
    return hexString;
}

md5

NSString *md5(NSString *str){
    const char *cStr = [str UTF8String];
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5( cStr, (uint32_t)strlen(cStr), digest );
    NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    
    for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
        [output appendFormat:@"%02x", digest[i]];
    
    return output;
}
}

AESEncrypt

+(NSString *)AESEncrypt:(NSString *)str key:(NSString *)enKey{
    
    NSString *md5Str = md5(enKey);
    NSData *key = hexToBytes(md5Str);
    NSData *content = [str dataUsingEncoding:NSUTF8StringEncoding];
    
    size_t bufferSize = content.length + kCCBlockSizeAES128;
    void *buffer = malloc( bufferSize );
    size_t numBytesEncrypted = 0;
    
    CCCryptorStatus result;
    result = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,
                     kCCOptionECBMode | kCCOptionPKCS7Padding,
                     key.bytes, key.length,NULL,
                     content.bytes, content.length,
                     buffer, bufferSize,
                     &numBytesEncrypted);
    if(result == kCCSuccess){
        NSData *data = [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
        NSString *encStr = parseByte2HexString(data);
        return encStr;
    }
    return @"";
}

AESDecrypt

+(NSString *)AESDecrypt:(NSString *)str key:(NSString *)deKey{
    NSString *md5Str = md5(deKey);
    NSData *key = hexToBytes(md5Str);
    NSData *content = hexToBytes(str);
    
    size_t bufferSize = content.length + kCCBlockSizeAES128;
    void *buffer = malloc( bufferSize );
    size_t numBytesEncrypted = 0;
    
    CCCryptorStatus result;
    result = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,
                     kCCOptionECBMode | kCCOptionPKCS7Padding,
                     key.bytes, key.length,NULL,
                     content.bytes, content.length,
                     buffer, bufferSize,
                     &numBytesEncrypted);
    if(result == kCCSuccess){
        NSData *data = [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
        NSString *encStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];//parseByte2HexString(data);
        return encStr;
    }
    return @"";
}

截图

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