str 转 md5

 

 

@interface NSString (MD5)

+ (NSString *)md5To32bit:(NSString *)str;

@end


@implementation NSString (MD5)

+ (NSString *)md5To32bit:(NSString *)str {
    
    const char *cStr = [str UTF8String];
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5( cStr, (CC_LONG)strlen(cStr),digest );
    NSMutableString *result = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
        [result appendFormat:@"%02x", digest[i]];
    return result;
}

@end