iOS md5加密

#import <CommonCrypto/CommonDigest.h>

//将订单号使用md5加密

-(NSString *) md5:(NSString *)str {

    const char *cStr = [str UTF8String];

    unsigned char result[16]= "0123456789abcdef";

    CC_MD5(cStr, (CC_LONG)strlen(cStr), result); // This is the md5 call

    return [NSString stringWithFormat:

            @"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",

            result[0], result[1], result[2], result[3],

            result[4], result[5], result[6], result[7],

            result[8], result[9], result[10], result[11],

            result[12], result[13], result[14], result[15]

            ];

}