ios-加密(EDS)

+(NSString *)encryptUseDES:(NSString *)plainText {

NSData *textData = [plainText dataUsingEncoding:NSUTF8StringEncoding];
NSUInteger dataLength = [textData length];

unsigned char buffer[1024];
memset(buffer, 0, sizeof(char));
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
                                      kCCAlgorithmDES,
                                      kCCOptionPKCS7Padding | kCCOptionECBMode,
                                      [KEY UTF8String],
                                      kCCKeySizeDES,
                                      nil,
                                      [textData bytes],
                                      dataLength,
                                      buffer,
                                      1024,
                                      &numBytesEncrypted);

NSMutableString *string = [[NSMutableString alloc]init ] ;

if (cryptStatus == kCCSuccess) {
    NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
    if (!data || [data length] == 0) {
        return @"";
    }
    string = [[NSMutableString alloc] initWithCapacity:[data length]];
    
    [data enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) {
        unsigned char *dataBytes = (unsigned char*)bytes;
        for (NSInteger i = 0; i < byteRange.length; i++) {
            NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff];
            if ([hexStr length] == 2) {
                [string appendString:hexStr];
            } else {
                [string appendFormat:@"0%@", hexStr];
            }
        }
    }];
    
    
}
return string;

}