objective-c md5例子

转自:http://www.cnblogs.com/tracy-e/archive/2011/04/13/1877351.html

@interface NSString (MyExtensions)

- (NSString *) md5;

@end

@implementation NSString (MyExtensions)

- (NSString *) md5

{

    const char *cStr = [self 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]

];  

}

@end