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const val TAG_LENGTH = 16 | |
class EncryptionOutput(val tag: ByteArray, | |
val ciphertext: ByteArray) | |
fun encrypt(key: SecretKey, iv: ByteArray, aad: ByteArray, message: ByteArray): EncryptionOutput { | |
val cipher = Cipher.getInstance("AES/GCM/NoPadding") | |
val spec = GCMParameterSpec(TAG_LENGTH * 8, iv) | |
cipher.init(Cipher.ENCRYPT_MODE, key, spec) | |
cipher.updateAAD(aad) | |
val result = cipher.doFinal(message) | |
val ciphertext = result.copyOfRange(0, result.size - TAG_LENGTH) | |
val tag = result.copyOfRange(result.size - TAG_LENGTH, result.size) | |
return EncryptionOutput(tag, ciphertext) | |
} | |
fun decrypt(key: SecretKey, iv: ByteArray, aad: ByteArray, tag: ByteArray, ciphertext: ByteArray): ByteArray { | |
val cipher = Cipher.getInstance("AES/GCM/NoPadding") | |
val spec = GCMParameterSpec(TAG_LENGTH * 8, iv) | |
cipher.init(Cipher.DECRYPT_MODE, key, spec) | |
cipher.updateAAD(aad) | |
return cipher.doFinal(ciphertext + tag) | |
} |
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