hash | 易学教程

How to create Hash object/array using jquery?

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问题 I know there is a Hash() object in the Javascript prototype framework, but is there anything in Jquery like this? As I would like to stick with one javascript framework, rather than mixing the Prototype Frame work and the JQuery framework and use at the same time, as I worry there will be conflict and create side-effects. So my question is: how to create Hash object/array using jquery? Here is my function: /* prototype framework, I want to change this to jQuery! */ var starSaves = new Hash();

SHA256 webhook signature from WooCommerce never verifies

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问题 I am receiving webhooks from a woocommerce site into a nodejs/express application. I am trying to verify the webhook's signature to prove authenticity, yet the hash I compute never corresponds to the signature that woocommerce reports in the hook's signature header. Here is the code I am using to verify the authenticity: function verifySignature(signature, payload, key){ var computedSignature = crypto.createHmac("sha256", key).update(payload).digest('base64'); debug('computed signature: %s',

Why is the default hashcode() in java bad?

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问题 if I remember correctly the default hashCode() implementation in java of an object of type Object() is to return the memory address of the object. When we create our own classes, I read that we want to override hashCode() so that when we insert them into a hash related collection like HashMap() it will work properly. But why is a memory address bad? Sure we will EVENTUALLY run out of memory and you'll have collisions, but the only case where I see this being a problem is where you are dealing

password_verify doesn't verify hash

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问题 I hash my inserted passwords via password_hash. I verify them by using password_verify. However when I insert a hashed password in my database and I try to verify it, both outputs always differ from eachother. my pages are as following, main_login.php (form): <?php include 'header.php';?> <body> <form role="form" method="post" action="login.php"> <div class="form-group"> <label for="usrname">Username:</label> <input type="text" class="form-control" name="usrname" placeholder="Enter username">

Which one to use: Managed vs. NonManaged hashing algorithms

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问题 In a regular C# application which class to use for hashing: xxxManaged or xxx (i.e SHA1Managed vs SHA1 ) and why? 回答1: The Non-managed hashes which end in ***Cng , ie SHA256Cng, will also have platform restrictions. They are quite a bit faster than the managed alternatives, but will fail at runtime on Windows XP, for example. If you know your program will always be run on Windows 7, Vista SP1, or 2008, however, they will generally perform quite a bit better than the managed versions, even

Best Way to Generate Random Salt in C#?

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问题 Question says it all, what is the best method of generating a random salt (to be used with a hash function) in C#? 回答1: You should use the RNGCryptoServiceProvider class to generate cryptographically secure random numbers.. 回答2: Enterprise Library should be able to create a random salt for you very effectively. Check it out here. 来源： https://stackoverflow.com/questions/6415724/best-way-to-generate-random-salt-in-c

SHA 256 Different Result

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问题 If I invoke the command from Mac echo hello | shasum -a 256 or from ubuntu echo hello | sha256sum Then I get the following result 5891b5b522d5df086d0ff0b110fbd9d21bb4fc7163af34d08286a2e846f6be03 - I notice there is dash at the end. But when I use Python hashlib or Java java.security.MessageDigest , they give me the same result as follows: 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824 So, could anyone point out where I got it wrong please? Thanks. Python: >>> import hashlib

HashSet 的 elements 为何一定要重写 hashCode() 和 equals() 方法

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 先看下 HashSet 的存储原理：比如我们实例化一个 HashSet 对象，然后存入一个元素： Set<Integer> set = new HashSet<Integer>(); set.add(new Integer(250)); 看下 HashSet 类的构造方法和 add() 方法源码： private static final Object PRESENT = new Object(); private transient HashMap<E,Object> map; public HashSet() { map = new HashMap<>(); } public boolean add(E e) { return map.put(e, PRESENT)==null; } 然后是 map.put() 方法的源码： public V put(K key, V value) { return putVal(hash(key), key, value, false, true); } 然后是 putVal() 方法源码： final V putVal(int hash, K key, V value, boolean onlyIfAbsent, boolean evict) { Node<K,V

How does one store password hashes securely in memory, when creating accounts?

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问题 Our web-based applications has user accounts tied down to users with the passwords specified during account creation. In the case of Java, how does one process the password securely, before persisting its hash in the database. To be more specific, how does one ensure that the string holding the password is garbage collected within a sufficiently short interval of time ? 回答1: If you have the possibility (may be difficult in web applications), it would be better to store passwords in character

How to determine a strings dna for likeness to another

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问题 I am hoping I am wording this correctly to get across what I am looking for. I need to compare two pieces of text. If the two strings are alike I would like to get scores that are very alike if the strings are very different i need scores that are very different. If i take a md5 hash of an email and change one character the hash changes dramatically I want something to not change too much. I need to compare how alike two pieces of content are without storing the string. Update : I am looking