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plurals

PO
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Id
19382826
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0
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2013-10-15T13:43:56.210
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2013-10-15T13:43:56.210
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1350193
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2
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text
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The CryptoJS API doesn't provide a way to specify a salt or the number of rounds for SHA256. You could add a salt manually if necessary, and specifying rounds doesn't make sense since "plain" SHA256 always uses a fixed number of rounds (64). The number of rounds in PHP's <code>crypt()</code> actually defines how often the SHA256 algorithm is applied consecutively, in order to increase the complexity of brute force attacks. The <a href="https://github.com/php/php-src/blob/master/ext/standard/crypt_sha256.c" rel="nofollow">PHP source code</a> comments on this as follows: "Repeatedly run the collected hash value through SHA256 to burn CPU cycles". As you can see in the source code (<a href="https://github.com/php/php-src/blob/master/ext/standard/crypt.c" rel="nofollow">here</a> and <a href="https://github.com/php/php-src/blob/master/ext/standard/crypt_sha256.c" rel="nofollow">here</a>), <code>crypt()</code> is actually a key derivation function that only makes use of SHA256 to generate cryptographically secure, salted hashes. So it also doesn't simply append the given salt to the key, instead it's a more elaborate process. Therefore, it is not possible to get the same results with the algorithms provided by CryptoJS. <code>crypt()</code> is mainly intended for password hashing. So if you need the hashes for another purpose, <code>hash()</code> is a good alternative (and of course creates exactly the same results as <code>CryptoJS.SHA256()</code>). However, bear in mind that any cryptography with JavaScript is generally <a href="http://www.matasano.com/articles/javascript-cryptography/" rel="nofollow">considered harmful</a>. Hence, you should better use SSL in your application, if possible, and generate the hashes server side. If this is an option, have a look at <a href="http://codahale.com/how-to-safely-store-a-password/" rel="nofollow">bcrypt</a>.
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1. This table or related slice is empty.
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1. POCryptoJS and PHP SHA256
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1. PTAnswer
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1. USAletheios
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1. POCryptoJS and PHP SHA256
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1. VO
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2. VO
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1. COPerfect Answer, Thank you for the considered and detailed response.
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 USleenix

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