This function will help you generate MD5 hash of a given string

Class.h

+ (NSString *)getMD5FromString:(NSString *)source;

Class.m

+ (NSString *)getMD5FromString:(NSString *)source{
	const char *src = ;
	unsigned char result[CC_MD5_DIGEST_LENGTH];
	CC_MD5(src, strlen(src), result);
    NSString *ret = [[[NSString alloc] initWithFormat:@"%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]
					  ] autorelease];
    return [ret lowercaseString];
}