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Avoids creating a new byte array at every call of conversation key.

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This commit is contained in:
Vitor Pamplona 2023-12-22 17:09:36 -05:00
parent 159228972c
commit 720ebfd0ea
1 changed files with 2 additions and 1 deletions
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3
quartz/src/main/java/com/vitorpamplona/quartz/crypto/Nip44v2.kt
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@ -23,6 +23,7 @@ class Nip44v2(val secp256k1: Secp256k1, val random: SecureRandom) {
private val hkdf = Hkdf()
private val h02 = Hex.decode("02")
private val saltPrefix = "nip44-v2".toByteArray(Charsets.UTF_8)
private val hashLength = 32
private val minPlaintextSize: Int = 0x0001 // 1b msg => padded to 32b
@ -179,7 +180,7 @@ class Nip44v2(val secp256k1: Secp256k1, val random: SecureRandom) {
*/
fun computeConversationKey(privateKey: ByteArray, pubKey: ByteArray): ByteArray {
val sharedX = secp256k1.pubKeyTweakMul(h02 + pubKey, privateKey).copyOfRange(1, 33)
return hkdf.extract(sharedX, "nip44-v2".toByteArray(Charsets.UTF_8))
return hkdf.extract(sharedX, saltPrefix)
}
class EncryptedInfo(