MD5加密方法

#import <CommonCrypto/CommonCrypto.h>


#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;
}