MD5加密字符串

//[iOS]MD5加密字符串
//将字符串进行MD5加密，返回加密后的字符串。

#import <CommonCrypto/CommonDigest.h> // Need to import for CC_MD5 access
- (NSString *)md5:(NSString *)str

{

    const char *cStr = [str UTF8String];

    unsigned char result[16];

    CC_MD5(cStr, 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]

        ];

}