From 4b7457c7f712b92f21604d8612ec8ff19df75c81 Mon Sep 17 00:00:00 2001
From: Tad Fisher <tadfisher@gmail.com>
Date: Sun, 9 Oct 2022 15:10:10 -0700
Subject: Add crypto-hwsecurity library

---
 .../app/passwordstore/crypto/DeviceHandler.kt      | 12 +++++++
 .../passwordstore/crypto/errors/CryptoException.kt | 39 ++++++++++++++++++++--
 2 files changed, 48 insertions(+), 3 deletions(-)
 create mode 100644 crypto-common/src/main/kotlin/app/passwordstore/crypto/DeviceHandler.kt

(limited to 'crypto-common/src/main')

diff --git a/crypto-common/src/main/kotlin/app/passwordstore/crypto/DeviceHandler.kt b/crypto-common/src/main/kotlin/app/passwordstore/crypto/DeviceHandler.kt
new file mode 100644
index 00000000..74eb0cfa
--- /dev/null
+++ b/crypto-common/src/main/kotlin/app/passwordstore/crypto/DeviceHandler.kt
@@ -0,0 +1,12 @@
+package app.passwordstore.crypto
+
+import app.passwordstore.crypto.errors.DeviceHandlerException
+import com.github.michaelbull.result.Result
+
+public interface DeviceHandler<Key, EncryptedSessionKey, DecryptedSessionKey> {
+  public suspend fun pairWithPublicKey(publicKey: Key): Result<Key, DeviceHandlerException>
+
+  public suspend fun decryptSessionKey(
+    encryptedSessionKey: EncryptedSessionKey
+  ): Result<DecryptedSessionKey, DeviceHandlerException>
+}
diff --git a/crypto-common/src/main/kotlin/app/passwordstore/crypto/errors/CryptoException.kt b/crypto-common/src/main/kotlin/app/passwordstore/crypto/errors/CryptoException.kt
index 81bdf95f..328a7a32 100644
--- a/crypto-common/src/main/kotlin/app/passwordstore/crypto/errors/CryptoException.kt
+++ b/crypto-common/src/main/kotlin/app/passwordstore/crypto/errors/CryptoException.kt
@@ -6,7 +6,7 @@ public sealed class CryptoException(message: String? = null, cause: Throwable? =
   Exception(message, cause)
 
 /** Sealed exception types for [KeyManager]. */
-public sealed class KeyManagerException(message: String? = null) : CryptoException(message)
+public sealed class KeyManagerException(message: String? = null, cause: Throwable? = null) : CryptoException(message, cause)
 
 /** Store contains no keys. */
 public object NoKeysAvailableException : KeyManagerException("No keys were found")
@@ -19,8 +19,8 @@ public object KeyDirectoryUnavailableException :
 public object KeyDeletionFailedException : KeyManagerException("Couldn't delete the key file")
 
 /** Failed to parse the key as a known type. */
-public object InvalidKeyException :
-  KeyManagerException("Given key cannot be parsed as a known key type")
+public class InvalidKeyException(cause: Throwable? = null) :
+  KeyManagerException("Given key cannot be parsed as a known key type", cause)
 
 /** No key matching `keyId` could be found. */
 public class KeyNotFoundException(keyId: String) :
@@ -30,6 +30,9 @@ public class KeyNotFoundException(keyId: String) :
 public class KeyAlreadyExistsException(keyId: String) :
   KeyManagerException("Pre-existing key was found for $keyId")
 
+public class NoSecretKeyException(keyId: String) :
+  KeyManagerException("No secret keys found for $keyId")
+
 /** Sealed exception types for [app.passwordstore.crypto.CryptoHandler]. */
 public sealed class CryptoHandlerException(message: String? = null, cause: Throwable? = null) :
   CryptoException(message, cause)
@@ -42,3 +45,33 @@ public class NoKeysProvided(message: String?) : CryptoHandlerException(message,
 
 /** An unexpected error that cannot be mapped to a known type. */
 public class UnknownError(cause: Throwable) : CryptoHandlerException(null, cause)
+
+public class KeySpecific(public val key: Any, cause: Throwable?) : CryptoHandlerException(key.toString(), cause)
+
+/** Wrapper containing possibly multiple child exceptions via [suppressedExceptions]. */
+public class MultipleKeySpecific(
+  message: String?,
+  public val errors: List<KeySpecific>
+) : CryptoHandlerException(message) {
+  init {
+    for (error in errors) {
+      addSuppressed(error)
+    }
+  }
+}
+
+/** Sealed exception types for [app.passwordstore.crypto.DeviceHandler]. */
+public sealed class DeviceHandlerException(message: String? = null, cause: Throwable? = null) :
+  CryptoHandlerException(message, cause)
+
+/** The device crypto operation was canceled by the user. */
+public class DeviceOperationCanceled(message: String) : DeviceHandlerException(message, null)
+
+/** The device crypto operation failed. */
+public class DeviceOperationFailed(message: String?, cause: Throwable? = null) : DeviceHandlerException(message, cause)
+
+/** The device's key fingerprint doesn't match the fingerprint we are trying to pair it to. */
+public class DeviceFingerprintMismatch(
+  public val publicFingerprint: String,
+  public val deviceFingerprint: String,
+) : DeviceHandlerException()
-- 
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