jetbrains.exodus.crypto.streamciphers.Salsa20StreamCipherProvider.kt Maven / Gradle / Ivy

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/**
 * Copyright 2010 - 2019 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jetbrains.exodus.crypto.streamciphers

import jetbrains.exodus.crypto.StreamCipher
import jetbrains.exodus.crypto.toByteArray
import org.bouncycastle.crypto.engines.Salsa20Engine
import org.bouncycastle.crypto.params.ParametersWithIV

const val SALSA20_CIPHER_ID = "jetbrains.exodus.crypto.streamciphers.Salsa20StreamCipherProvider"

@Suppress("unused")
class Salsa20StreamCipherProvider : KeyAwareStreamCipherProvider() {

    override fun getId() = SALSA20_CIPHER_ID

    override fun newCipher(): StreamCipher = Salsa20StreamCipher(this)

    private class Salsa20StreamCipher(provider: Salsa20StreamCipherProvider) : KeyAwareStreamCipher(provider) {

        private lateinit var engine: Salsa20Engine

        override fun init(key: ByteArray, iv: Long) {
            this.engine = Salsa20Engine().apply { init(true, ParametersWithIV(getKeyParameter(key), iv.toByteArray())) }
        }

        override fun crypt(b: Byte): Byte {
            return engine.returnByte(b)
        }
    }
}