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doc: Adding best practises for crypto.pbkdf2 #3290

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doc: Adding best practises for crypto.pbkdf2 
Added some information around usages of how to use iterations, how to
choose decent salts and updating the example to have a significant work
factor and to use sha512.
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@tomgco
tomgco committed Nov 23, 2015
commit e1b39b0c60089e01bd5d254b53279ff2c120b79d
9 changes: 8 additions & 1 deletion doc/api/crypto.markdown
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Expand Up @@ -625,9 +625,16 @@ Asynchronous PBKDF2 function. Applies the selected HMAC digest function
salt and number of iterations. The callback gets two arguments:
`(err, derivedKey)`.

The number of iterations passed to pbkdf2 should be as high as possible, the
higher the number, the more secure it will be, but will take a longer amount of
time to complete.

Chosen salts should also be unique. It is recommended that the salts are random
and their length is greater than 16 bytes. See NIST 800-132 for details.

Example:

crypto.pbkdf2('secret', 'salt', 4096, 64, 'sha256', function(err, key) {
crypto.pbkdf2('secret', 'salt', 100000, 512, 'sha512', function(err, key) {
if (err)
throw err;
console.log(key.toString('hex')); // 'c5e478d...1469e50'
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