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/*
* Copyright (C) 2020 Square, Inc. and others.
*
* 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 okio
import javax.crypto.spec.IvParameterSpec
import javax.crypto.spec.SecretKeySpec
import kotlin.random.Random
data class CipherAlgorithm(
val transformation: String,
val padding: Boolean,
val keyLength: Int,
val ivLength: Int? = null
) {
fun createCipherFactory(random: Random): CipherFactory {
val key = random.nextBytes(keyLength)
val secretKeySpec = SecretKeySpec(key, transformation.substringBefore('/'))
return if (ivLength == null) {
CipherFactory(transformation) { mode ->
init(mode, secretKeySpec)
}
} else {
val iv = random.nextBytes(ivLength)
val ivParameterSpec = IvParameterSpec(iv)
CipherFactory(transformation) { mode ->
init(mode, secretKeySpec, ivParameterSpec)
}
}
}
override fun toString() = transformation
companion object {
val BLOCK_CIPHER_ALGORITHMS
get() = listOf(
CipherAlgorithm("AES/CBC/NoPadding", false, 16, 16),
CipherAlgorithm("AES/CBC/PKCS5Padding", true, 16, 16),
CipherAlgorithm("AES/ECB/NoPadding", false, 16),
CipherAlgorithm("AES/ECB/PKCS5Padding", true, 16),
CipherAlgorithm("DES/CBC/NoPadding", false, 8, 8),
CipherAlgorithm("DES/CBC/PKCS5Padding", true, 8, 8),
CipherAlgorithm("DES/ECB/NoPadding", false, 8),
CipherAlgorithm("DES/ECB/PKCS5Padding", true, 8),
CipherAlgorithm("DESede/CBC/NoPadding", false, 24, 8),
CipherAlgorithm("DESede/CBC/PKCS5Padding", true, 24, 8),
CipherAlgorithm("DESede/ECB/NoPadding", false, 24),
CipherAlgorithm("DESede/ECB/PKCS5Padding", true, 24)
)
}
}
