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var checkParameters = require('./lib/precondition')
var native = require('crypto')
function nativePBKDF2 (password, salt, iterations, keylen, digest, callback) {
checkParameters(password, salt, iterations, keylen)
if (typeof digest === 'function') {
callback = digest
digest = 'sha1'
}
if (typeof callback !== 'function') throw new Error('No callback provided to pbkdf2')
return native.pbkdf2(password, salt, iterations, keylen, digest, callback)
}
function nativePBKDF2Sync (password, salt, iterations, keylen, digest) {
checkParameters(password, salt, iterations, keylen)
digest = digest || 'sha1'
return native.pbkdf2Sync(password, salt, iterations, keylen, digest)
}
/* istanbul ignore next */
if (!native.pbkdf2Sync || native.pbkdf2Sync.toString().indexOf('keylen, digest') === -1) {
exports.pbkdf2Sync = require('./lib/sync')
exports.pbkdf2 = require('./lib/async')
// native
} else {
exports.pbkdf2Sync = nativePBKDF2Sync
exports.pbkdf2 = nativePBKDF2
}
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