60 lines
2.9 KiB
Kotlin
60 lines
2.9 KiB
Kotlin
package org.thoughtcrime.securesms.crypto
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import android.content.Context
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import com.goterl.lazysodium.LazySodiumAndroid
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import com.goterl.lazysodium.SodiumAndroid
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import com.goterl.lazysodium.utils.Key
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import com.goterl.lazysodium.utils.KeyPair
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import org.session.libsignal.crypto.ecc.DjbECPrivateKey
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import org.session.libsignal.crypto.ecc.DjbECPublicKey
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import org.session.libsignal.crypto.ecc.ECKeyPair
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import org.session.libsignal.utilities.Base64
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import org.session.libsignal.utilities.Hex
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object KeyPairUtilities {
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private val sodium by lazy { LazySodiumAndroid(SodiumAndroid()) }
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fun generate(): KeyPairGenerationResult {
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val seed = sodium.randomBytesBuf(16)
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try {
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return generate(seed)
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} catch (exception: Exception) {
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return generate()
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}
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}
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fun generate(seed: ByteArray): KeyPairGenerationResult {
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val padding = ByteArray(16) { 0 }
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val ed25519KeyPair = sodium.cryptoSignSeedKeypair(seed + padding)
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val sodiumX25519KeyPair = sodium.convertKeyPairEd25519ToCurve25519(ed25519KeyPair)
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val x25519KeyPair = ECKeyPair(DjbECPublicKey(sodiumX25519KeyPair.publicKey.asBytes), DjbECPrivateKey(sodiumX25519KeyPair.secretKey.asBytes))
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return KeyPairGenerationResult(seed, ed25519KeyPair, x25519KeyPair)
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}
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fun store(context: Context, seed: ByteArray, ed25519KeyPair: KeyPair, x25519KeyPair: ECKeyPair) {
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IdentityKeyUtil.save(context, IdentityKeyUtil.LOKI_SEED, Hex.toStringCondensed(seed))
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IdentityKeyUtil.save(context, IdentityKeyUtil.IDENTITY_PUBLIC_KEY_PREF, Base64.encodeBytes(x25519KeyPair.publicKey.serialize()))
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IdentityKeyUtil.save(context, IdentityKeyUtil.IDENTITY_PRIVATE_KEY_PREF, Base64.encodeBytes(x25519KeyPair.privateKey.serialize()))
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IdentityKeyUtil.save(context, IdentityKeyUtil.ED25519_PUBLIC_KEY, Base64.encodeBytes(ed25519KeyPair.publicKey.asBytes))
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IdentityKeyUtil.save(context, IdentityKeyUtil.ED25519_SECRET_KEY, Base64.encodeBytes(ed25519KeyPair.secretKey.asBytes))
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}
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fun hasV2KeyPair(context: Context): Boolean {
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return (IdentityKeyUtil.retrieve(context, IdentityKeyUtil.ED25519_SECRET_KEY) != null)
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}
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fun getUserED25519KeyPair(context: Context): KeyPair? {
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val base64EncodedED25519PublicKey = IdentityKeyUtil.retrieve(context, IdentityKeyUtil.ED25519_PUBLIC_KEY) ?: return null
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val base64EncodedED25519SecretKey = IdentityKeyUtil.retrieve(context, IdentityKeyUtil.ED25519_SECRET_KEY) ?: return null
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val ed25519PublicKey = Key.fromBytes(Base64.decode(base64EncodedED25519PublicKey))
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val ed25519SecretKey = Key.fromBytes(Base64.decode(base64EncodedED25519SecretKey))
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return KeyPair(ed25519PublicKey, ed25519SecretKey)
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}
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data class KeyPairGenerationResult(
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val seed: ByteArray,
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val ed25519KeyPair: KeyPair,
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val x25519KeyPair: ECKeyPair
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)
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} |