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Change crypto_kdf_KEYBYTES to be 32 and use subarray instead of slice

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Thanks to Emil Bayes for the advice.
This commit is contained in:
Jim Pick 2018-03-03 09:19:06 -08:00 committed by Emil Bay
parent 5159d68fa9
commit 4e1c69ba13
1 changed files with 2 additions and 2 deletions
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4
crypto_kdf.js
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@ -6,7 +6,7 @@ module.exports.crypto_kdf_PRIMITIVE = 'blake2b'
module.exports.crypto_kdf_BYTES_MIN = 16 module.exports.crypto_kdf_BYTES_MIN = 16
module.exports.crypto_kdf_BYTES_MAX = 64 module.exports.crypto_kdf_BYTES_MAX = 64
module.exports.crypto_kdf_CONTEXTBYTES = 8 module.exports.crypto_kdf_CONTEXTBYTES = 8
module.exports.crypto_kdf_KEYBYTES = 64 module.exports.crypto_kdf_KEYBYTES = 32
function STORE64_LE(dest, int) { function STORE64_LE(dest, int) {
var mul = 1 var mul = 1
@ -29,7 +29,7 @@ module.exports.crypto_kdf_derive_from_key = function crypto_kdf_derive_from_key
STORE64_LE(salt, subkey_id) STORE64_LE(salt, subkey_id)
var outlen = Math.min(subkey.length, module.exports.crypto_kdf_BYTES_MAX) var outlen = Math.min(subkey.length, module.exports.crypto_kdf_BYTES_MAX)
blake2b(outlen, key.slice(0, blake2b.KEYBYTES), salt, ctx_padded, true) blake2b(outlen, key.subarray(0, module.exports.crypto_kdf_KEYBYTES), salt, ctx_padded, true)
.final(subkey) .final(subkey)
} }