iOS MD5加密算法

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#pragma mark - 32位 小写+ (NSString *)MD5ForLower32Bate:(NSString *)str{        //要进行UTF8的转码    const char* input = [str UTF8String];    unsigned char result[CC_MD5_DIGEST_LENGTH];    CC_MD5(input, (CC_LONG)strlen(input), result);        NSMutableString *digest = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];    for (NSInteger i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {        [digest appendFormat:@"%02x", result[i]];    }        return digest;}#pragma mark - 32位 大写+ (NSString *)MD5ForUpper32Bate:(NSString *)str{        //要进行UTF8的转码    const char* input = [str UTF8String];    unsigned char result[CC_MD5_DIGEST_LENGTH];    CC_MD5(input, (CC_LONG)strlen(input), result);        NSMutableString *digest = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];    for (NSInteger i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {        [digest appendFormat:@"%02X", result[i]];    }        return digest;}#pragma mark - 16位 大写+ (NSString *)MD5ForUpper16Bate:(NSString *)str{        NSString *md5Str = [self MD5ForUpper32Bate:str];        NSString  *string;    for (int i=0; i<24; i++) {        string=[md5Str substringWithRange:NSMakeRange(8, 16)];    }    return string;}#pragma mark - 16位 小写+ (NSString *)MD5ForLower16Bate:(NSString *)str{        NSString *md5Str = [self MD5ForLower32Bate:str];        NSString  *string;    for (int i=0; i<24; i++) {        string=[md5Str substringWithRange:NSMakeRange(8, 16)];    }    return string;}
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