// Copyright 2025 Google LLC
//
// 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.

syntax = "proto3";

package google.cloud.kms.v1;

import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/protobuf/duration.proto";
import "google/protobuf/timestamp.proto";
import "google/protobuf/wrappers.proto";

option csharp_namespace = "Google.Cloud.Kms.V1";
option go_package = "cloud.google.com/go/kms/apiv1/kmspb;kmspb";
option java_multiple_files = true;
option java_outer_classname = "KmsResourcesProto";
option java_package = "com.google.cloud.kms.v1";
option php_namespace = "Google\\Cloud\\Kms\\V1";

// LINT: LEGACY_NAMES

// A [KeyRing][google.cloud.kms.v1.KeyRing] is a toplevel logical grouping of
// [CryptoKeys][google.cloud.kms.v1.CryptoKey].
message KeyRing {
  option (google.api.resource) = {
    type: "cloudkms.googleapis.com/KeyRing"
    pattern: "projects/{project}/locations/{location}/keyRings/{key_ring}"
  };

  // Output only. The resource name for the
  // [KeyRing][google.cloud.kms.v1.KeyRing] in the format
  // `projects/*/locations/*/keyRings/*`.
  string name = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time at which this [KeyRing][google.cloud.kms.v1.KeyRing]
  // was created.
  google.protobuf.Timestamp create_time = 2
      [(google.api.field_behavior) = OUTPUT_ONLY];
}

// A [CryptoKey][google.cloud.kms.v1.CryptoKey] represents a logical key that
// can be used for cryptographic operations.
//
// A [CryptoKey][google.cloud.kms.v1.CryptoKey] is made up of zero or more
// [versions][google.cloud.kms.v1.CryptoKeyVersion], which represent the actual
// key material used in cryptographic operations.
message CryptoKey {
  option (google.api.resource) = {
    type: "cloudkms.googleapis.com/CryptoKey"
    pattern: "projects/{project}/locations/{location}/keyRings/{key_ring}/cryptoKeys/{crypto_key}"
  };

  // [CryptoKeyPurpose][google.cloud.kms.v1.CryptoKey.CryptoKeyPurpose]
  // describes the cryptographic capabilities of a
  // [CryptoKey][google.cloud.kms.v1.CryptoKey]. A given key can only be used
  // for the operations allowed by its purpose. For more information, see [Key
  // purposes](https://cloud.google.com/kms/docs/algorithms#key_purposes).
  enum CryptoKeyPurpose {
    // Not specified.
    CRYPTO_KEY_PURPOSE_UNSPECIFIED = 0;

    // [CryptoKeys][google.cloud.kms.v1.CryptoKey] with this purpose may be used
    // with [Encrypt][google.cloud.kms.v1.KeyManagementService.Encrypt] and
    // [Decrypt][google.cloud.kms.v1.KeyManagementService.Decrypt].
    ENCRYPT_DECRYPT = 1;

    // [CryptoKeys][google.cloud.kms.v1.CryptoKey] with this purpose may be used
    // with
    // [AsymmetricSign][google.cloud.kms.v1.KeyManagementService.AsymmetricSign]
    // and
    // [GetPublicKey][google.cloud.kms.v1.KeyManagementService.GetPublicKey].
    ASYMMETRIC_SIGN = 5;

    // [CryptoKeys][google.cloud.kms.v1.CryptoKey] with this purpose may be used
    // with
    // [AsymmetricDecrypt][google.cloud.kms.v1.KeyManagementService.AsymmetricDecrypt]
    // and
    // [GetPublicKey][google.cloud.kms.v1.KeyManagementService.GetPublicKey].
    ASYMMETRIC_DECRYPT = 6;

    // [CryptoKeys][google.cloud.kms.v1.CryptoKey] with this purpose may be used
    // with [RawEncrypt][google.cloud.kms.v1.KeyManagementService.RawEncrypt]
    // and [RawDecrypt][google.cloud.kms.v1.KeyManagementService.RawDecrypt].
    // This purpose is meant to be used for interoperable symmetric
    // encryption and does not support automatic CryptoKey rotation.
    RAW_ENCRYPT_DECRYPT = 7;

    // [CryptoKeys][google.cloud.kms.v1.CryptoKey] with this purpose may be used
    // with [MacSign][google.cloud.kms.v1.KeyManagementService.MacSign].
    MAC = 9;
  }

  // Output only. The resource name for this
  // [CryptoKey][google.cloud.kms.v1.CryptoKey] in the format
  // `projects/*/locations/*/keyRings/*/cryptoKeys/*`.
  string name = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. A copy of the "primary"
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] that will be used
  // by [Encrypt][google.cloud.kms.v1.KeyManagementService.Encrypt] when this
  // [CryptoKey][google.cloud.kms.v1.CryptoKey] is given in
  // [EncryptRequest.name][google.cloud.kms.v1.EncryptRequest.name].
  //
  // The [CryptoKey][google.cloud.kms.v1.CryptoKey]'s primary version can be
  // updated via
  // [UpdateCryptoKeyPrimaryVersion][google.cloud.kms.v1.KeyManagementService.UpdateCryptoKeyPrimaryVersion].
  //
  // Keys with [purpose][google.cloud.kms.v1.CryptoKey.purpose]
  // [ENCRYPT_DECRYPT][google.cloud.kms.v1.CryptoKey.CryptoKeyPurpose.ENCRYPT_DECRYPT]
  // may have a primary. For other keys, this field will be omitted.
  CryptoKeyVersion primary = 2 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Immutable. The immutable purpose of this
  // [CryptoKey][google.cloud.kms.v1.CryptoKey].
  CryptoKeyPurpose purpose = 3 [(google.api.field_behavior) = IMMUTABLE];

  // Output only. The time at which this
  // [CryptoKey][google.cloud.kms.v1.CryptoKey] was created.
  google.protobuf.Timestamp create_time = 5
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // At [next_rotation_time][google.cloud.kms.v1.CryptoKey.next_rotation_time],
  // the Key Management Service will automatically:
  //
  // 1. Create a new version of this [CryptoKey][google.cloud.kms.v1.CryptoKey].
  // 2. Mark the new version as primary.
  //
  // Key rotations performed manually via
  // [CreateCryptoKeyVersion][google.cloud.kms.v1.KeyManagementService.CreateCryptoKeyVersion]
  // and
  // [UpdateCryptoKeyPrimaryVersion][google.cloud.kms.v1.KeyManagementService.UpdateCryptoKeyPrimaryVersion]
  // do not affect
  // [next_rotation_time][google.cloud.kms.v1.CryptoKey.next_rotation_time].
  //
  // Keys with [purpose][google.cloud.kms.v1.CryptoKey.purpose]
  // [ENCRYPT_DECRYPT][google.cloud.kms.v1.CryptoKey.CryptoKeyPurpose.ENCRYPT_DECRYPT]
  // support automatic rotation. For other keys, this field must be omitted.
  google.protobuf.Timestamp next_rotation_time = 7;

  // Controls the rate of automatic rotation.
  oneof rotation_schedule {
    // [next_rotation_time][google.cloud.kms.v1.CryptoKey.next_rotation_time]
    // will be advanced by this period when the service automatically rotates a
    // key. Must be at least 24 hours and at most 876,000 hours.
    //
    // If [rotation_period][google.cloud.kms.v1.CryptoKey.rotation_period] is
    // set,
    // [next_rotation_time][google.cloud.kms.v1.CryptoKey.next_rotation_time]
    // must also be set.
    //
    // Keys with [purpose][google.cloud.kms.v1.CryptoKey.purpose]
    // [ENCRYPT_DECRYPT][google.cloud.kms.v1.CryptoKey.CryptoKeyPurpose.ENCRYPT_DECRYPT]
    // support automatic rotation. For other keys, this field must be omitted.
    google.protobuf.Duration rotation_period = 8;
  }

  // A template describing settings for new
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] instances. The
  // properties of new [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion]
  // instances created by either
  // [CreateCryptoKeyVersion][google.cloud.kms.v1.KeyManagementService.CreateCryptoKeyVersion]
  // or auto-rotation are controlled by this template.
  CryptoKeyVersionTemplate version_template = 11;

  // Labels with user-defined metadata. For more information, see
  // [Labeling Keys](https://cloud.google.com/kms/docs/labeling-keys).
  map<string, string> labels = 10;

  // Immutable. Whether this key may contain imported versions only.
  bool import_only = 13 [(google.api.field_behavior) = IMMUTABLE];

  // Immutable. The period of time that versions of this key spend in the
  // [DESTROY_SCHEDULED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.DESTROY_SCHEDULED]
  // state before transitioning to
  // [DESTROYED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.DESTROYED].
  // If not specified at creation time, the default duration is 30 days.
  google.protobuf.Duration destroy_scheduled_duration = 14
      [(google.api.field_behavior) = IMMUTABLE];

  // Immutable. The resource name of the backend environment where the key
  // material for all [CryptoKeyVersions][google.cloud.kms.v1.CryptoKeyVersion]
  // associated with this [CryptoKey][google.cloud.kms.v1.CryptoKey] reside and
  // where all related cryptographic operations are performed. Only applicable
  // if [CryptoKeyVersions][google.cloud.kms.v1.CryptoKeyVersion] have a
  // [ProtectionLevel][google.cloud.kms.v1.ProtectionLevel] of
  // [EXTERNAL_VPC][google.cloud.kms.v1.ProtectionLevel.EXTERNAL_VPC], with the
  // resource name in the format `projects/*/locations/*/ekmConnections/*`.
  // Note, this list is non-exhaustive and may apply to additional
  // [ProtectionLevels][google.cloud.kms.v1.ProtectionLevel] in the future.
  string crypto_key_backend = 15 [
    (google.api.field_behavior) = IMMUTABLE,
    (google.api.resource_reference) = { type: "*" }
  ];

  // Optional. The policy used for Key Access Justifications Policy Enforcement.
  // If this field is present and this key is enrolled in Key Access
  // Justifications Policy Enforcement, the policy will be evaluated in encrypt,
  // decrypt, and sign operations, and the operation will fail if rejected by
  // the policy. The policy is defined by specifying zero or more allowed
  // justification codes.
  // https://cloud.google.com/assured-workloads/key-access-justifications/docs/justification-codes
  // By default, this field is absent, and all justification codes are allowed.
  KeyAccessJustificationsPolicy key_access_justifications_policy = 17
      [(google.api.field_behavior) = OPTIONAL];
}

// A [CryptoKeyVersionTemplate][google.cloud.kms.v1.CryptoKeyVersionTemplate]
// specifies the properties to use when creating a new
// [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion], either manually
// with
// [CreateCryptoKeyVersion][google.cloud.kms.v1.KeyManagementService.CreateCryptoKeyVersion]
// or automatically as a result of auto-rotation.
message CryptoKeyVersionTemplate {
  // [ProtectionLevel][google.cloud.kms.v1.ProtectionLevel] to use when creating
  // a [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] based on this
  // template. Immutable. Defaults to
  // [SOFTWARE][google.cloud.kms.v1.ProtectionLevel.SOFTWARE].
  ProtectionLevel protection_level = 1;

  // Required.
  // [Algorithm][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionAlgorithm]
  // to use when creating a
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] based on this
  // template.
  //
  // For backwards compatibility, GOOGLE_SYMMETRIC_ENCRYPTION is implied if both
  // this field is omitted and
  // [CryptoKey.purpose][google.cloud.kms.v1.CryptoKey.purpose] is
  // [ENCRYPT_DECRYPT][google.cloud.kms.v1.CryptoKey.CryptoKeyPurpose.ENCRYPT_DECRYPT].
  CryptoKeyVersion.CryptoKeyVersionAlgorithm algorithm = 3
      [(google.api.field_behavior) = REQUIRED];
}

// Contains an HSM-generated attestation about a key operation. For more
// information, see [Verifying attestations]
// (https://cloud.google.com/kms/docs/attest-key).
message KeyOperationAttestation {
  // Attestation formats provided by the HSM.
  enum AttestationFormat {
    // Not specified.
    ATTESTATION_FORMAT_UNSPECIFIED = 0;

    // Cavium HSM attestation compressed with gzip. Note that this format is
    // defined by Cavium and subject to change at any time.
    //
    // See
    // https://www.marvell.com/products/security-solutions/nitrox-hs-adapters/software-key-attestation.html.
    CAVIUM_V1_COMPRESSED = 3;

    // Cavium HSM attestation V2 compressed with gzip. This is a new format
    // introduced in Cavium's version 3.2-08.
    CAVIUM_V2_COMPRESSED = 4;
  }

  // Certificate chains needed to verify the attestation.
  // Certificates in chains are PEM-encoded and are ordered based on
  // https://tools.ietf.org/html/rfc5246#section-7.4.2.
  message CertificateChains {
    // Cavium certificate chain corresponding to the attestation.
    repeated string cavium_certs = 1;

    // Google card certificate chain corresponding to the attestation.
    repeated string google_card_certs = 2;

    // Google partition certificate chain corresponding to the attestation.
    repeated string google_partition_certs = 3;
  }

  // Output only. The format of the attestation data.
  AttestationFormat format = 4 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The attestation data provided by the HSM when the key
  // operation was performed.
  bytes content = 5 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The certificate chains needed to validate the attestation
  CertificateChains cert_chains = 6 [(google.api.field_behavior) = OUTPUT_ONLY];
}

// A [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] represents an
// individual cryptographic key, and the associated key material.
//
// An
// [ENABLED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.ENABLED]
// version can be used for cryptographic operations.
//
// For security reasons, the raw cryptographic key material represented by a
// [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] can never be viewed
// or exported. It can only be used to encrypt, decrypt, or sign data when an
// authorized user or application invokes Cloud KMS.
message CryptoKeyVersion {
  option (google.api.resource) = {
    type: "cloudkms.googleapis.com/CryptoKeyVersion"
    pattern: "projects/{project}/locations/{location}/keyRings/{key_ring}/cryptoKeys/{crypto_key}/cryptoKeyVersions/{crypto_key_version}"
  };

  // The algorithm of the
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion], indicating what
  // parameters must be used for each cryptographic operation.
  //
  // The
  // [GOOGLE_SYMMETRIC_ENCRYPTION][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionAlgorithm.GOOGLE_SYMMETRIC_ENCRYPTION]
  // algorithm is usable with
  // [CryptoKey.purpose][google.cloud.kms.v1.CryptoKey.purpose]
  // [ENCRYPT_DECRYPT][google.cloud.kms.v1.CryptoKey.CryptoKeyPurpose.ENCRYPT_DECRYPT].
  //
  // Algorithms beginning with `RSA_SIGN_` are usable with
  // [CryptoKey.purpose][google.cloud.kms.v1.CryptoKey.purpose]
  // [ASYMMETRIC_SIGN][google.cloud.kms.v1.CryptoKey.CryptoKeyPurpose.ASYMMETRIC_SIGN].
  //
  // The fields in the name after `RSA_SIGN_` correspond to the following
  // parameters: padding algorithm, modulus bit length, and digest algorithm.
  //
  // For PSS, the salt length used is equal to the length of digest
  // algorithm. For example,
  // [RSA_SIGN_PSS_2048_SHA256][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionAlgorithm.RSA_SIGN_PSS_2048_SHA256]
  // will use PSS with a salt length of 256 bits or 32 bytes.
  //
  // Algorithms beginning with `RSA_DECRYPT_` are usable with
  // [CryptoKey.purpose][google.cloud.kms.v1.CryptoKey.purpose]
  // [ASYMMETRIC_DECRYPT][google.cloud.kms.v1.CryptoKey.CryptoKeyPurpose.ASYMMETRIC_DECRYPT].
  //
  // The fields in the name after `RSA_DECRYPT_` correspond to the following
  // parameters: padding algorithm, modulus bit length, and digest algorithm.
  //
  // Algorithms beginning with `EC_SIGN_` are usable with
  // [CryptoKey.purpose][google.cloud.kms.v1.CryptoKey.purpose]
  // [ASYMMETRIC_SIGN][google.cloud.kms.v1.CryptoKey.CryptoKeyPurpose.ASYMMETRIC_SIGN].
  //
  // The fields in the name after `EC_SIGN_` correspond to the following
  // parameters: elliptic curve, digest algorithm.
  //
  // Algorithms beginning with `HMAC_` are usable with
  // [CryptoKey.purpose][google.cloud.kms.v1.CryptoKey.purpose]
  // [MAC][google.cloud.kms.v1.CryptoKey.CryptoKeyPurpose.MAC].
  //
  // The suffix following `HMAC_` corresponds to the hash algorithm being used
  // (eg. SHA256).
  //
  //
  // For more information, see [Key purposes and algorithms]
  // (https://cloud.google.com/kms/docs/algorithms).
  enum CryptoKeyVersionAlgorithm {
    // Not specified.
    CRYPTO_KEY_VERSION_ALGORITHM_UNSPECIFIED = 0;

    // Creates symmetric encryption keys.
    GOOGLE_SYMMETRIC_ENCRYPTION = 1;

    // AES-GCM (Galois Counter Mode) using 128-bit keys.
    AES_128_GCM = 41;

    // AES-GCM (Galois Counter Mode) using 256-bit keys.
    AES_256_GCM = 19;

    // AES-CBC (Cipher Block Chaining Mode) using 128-bit keys.
    AES_128_CBC = 42;

    // AES-CBC (Cipher Block Chaining Mode) using 256-bit keys.
    AES_256_CBC = 43;

    // AES-CTR (Counter Mode) using 128-bit keys.
    AES_128_CTR = 44;

    // AES-CTR (Counter Mode) using 256-bit keys.
    AES_256_CTR = 45;

    // RSASSA-PSS 2048 bit key with a SHA256 digest.
    RSA_SIGN_PSS_2048_SHA256 = 2;

    // RSASSA-PSS 3072 bit key with a SHA256 digest.
    RSA_SIGN_PSS_3072_SHA256 = 3;

    // RSASSA-PSS 4096 bit key with a SHA256 digest.
    RSA_SIGN_PSS_4096_SHA256 = 4;

    // RSASSA-PSS 4096 bit key with a SHA512 digest.
    RSA_SIGN_PSS_4096_SHA512 = 15;

    // RSASSA-PKCS1-v1_5 with a 2048 bit key and a SHA256 digest.
    RSA_SIGN_PKCS1_2048_SHA256 = 5;

    // RSASSA-PKCS1-v1_5 with a 3072 bit key and a SHA256 digest.
    RSA_SIGN_PKCS1_3072_SHA256 = 6;

    // RSASSA-PKCS1-v1_5 with a 4096 bit key and a SHA256 digest.
    RSA_SIGN_PKCS1_4096_SHA256 = 7;

    // RSASSA-PKCS1-v1_5 with a 4096 bit key and a SHA512 digest.
    RSA_SIGN_PKCS1_4096_SHA512 = 16;

    // RSASSA-PKCS1-v1_5 signing without encoding, with a 2048 bit key.
    RSA_SIGN_RAW_PKCS1_2048 = 28;

    // RSASSA-PKCS1-v1_5 signing without encoding, with a 3072 bit key.
    RSA_SIGN_RAW_PKCS1_3072 = 29;

    // RSASSA-PKCS1-v1_5 signing without encoding, with a 4096 bit key.
    RSA_SIGN_RAW_PKCS1_4096 = 30;

    // RSAES-OAEP 2048 bit key with a SHA256 digest.
    RSA_DECRYPT_OAEP_2048_SHA256 = 8;

    // RSAES-OAEP 3072 bit key with a SHA256 digest.
    RSA_DECRYPT_OAEP_3072_SHA256 = 9;

    // RSAES-OAEP 4096 bit key with a SHA256 digest.
    RSA_DECRYPT_OAEP_4096_SHA256 = 10;

    // RSAES-OAEP 4096 bit key with a SHA512 digest.
    RSA_DECRYPT_OAEP_4096_SHA512 = 17;

    // RSAES-OAEP 2048 bit key with a SHA1 digest.
    RSA_DECRYPT_OAEP_2048_SHA1 = 37;

    // RSAES-OAEP 3072 bit key with a SHA1 digest.
    RSA_DECRYPT_OAEP_3072_SHA1 = 38;

    // RSAES-OAEP 4096 bit key with a SHA1 digest.
    RSA_DECRYPT_OAEP_4096_SHA1 = 39;

    // ECDSA on the NIST P-256 curve with a SHA256 digest.
    // Other hash functions can also be used:
    // https://cloud.google.com/kms/docs/create-validate-signatures#ecdsa_support_for_other_hash_algorithms
    EC_SIGN_P256_SHA256 = 12;

    // ECDSA on the NIST P-384 curve with a SHA384 digest.
    // Other hash functions can also be used:
    // https://cloud.google.com/kms/docs/create-validate-signatures#ecdsa_support_for_other_hash_algorithms
    EC_SIGN_P384_SHA384 = 13;

    // ECDSA on the non-NIST secp256k1 curve. This curve is only supported for
    // HSM protection level.
    // Other hash functions can also be used:
    // https://cloud.google.com/kms/docs/create-validate-signatures#ecdsa_support_for_other_hash_algorithms
    EC_SIGN_SECP256K1_SHA256 = 31;

    // EdDSA on the Curve25519 in pure mode (taking data as input).
    EC_SIGN_ED25519 = 40;

    // HMAC-SHA256 signing with a 256 bit key.
    HMAC_SHA256 = 32;

    // HMAC-SHA1 signing with a 160 bit key.
    HMAC_SHA1 = 33;

    // HMAC-SHA384 signing with a 384 bit key.
    HMAC_SHA384 = 34;

    // HMAC-SHA512 signing with a 512 bit key.
    HMAC_SHA512 = 35;

    // HMAC-SHA224 signing with a 224 bit key.
    HMAC_SHA224 = 36;

    // Algorithm representing symmetric encryption by an external key manager.
    EXTERNAL_SYMMETRIC_ENCRYPTION = 18;

    // The post-quantum Module-Lattice-Based Digital Signature Algorithm, at
    // security level 3. Randomized version.
    PQ_SIGN_ML_DSA_65 = 56;

    // The post-quantum stateless hash-based digital signature algorithm, at
    // security level 1. Randomized version.
    PQ_SIGN_SLH_DSA_SHA2_128S = 57;
  }

  // The state of a [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion],
  // indicating if it can be used.
  enum CryptoKeyVersionState {
    // Not specified.
    CRYPTO_KEY_VERSION_STATE_UNSPECIFIED = 0;

    // This version is still being generated. It may not be used, enabled,
    // disabled, or destroyed yet. Cloud KMS will automatically mark this
    // version
    // [ENABLED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.ENABLED]
    // as soon as the version is ready.
    PENDING_GENERATION = 5;

    // This version may be used for cryptographic operations.
    ENABLED = 1;

    // This version may not be used, but the key material is still available,
    // and the version can be placed back into the
    // [ENABLED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.ENABLED]
    // state.
    DISABLED = 2;

    // This version is destroyed, and the key material is no longer stored.
    // This version may only become
    // [ENABLED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.ENABLED]
    // again if this version is
    // [reimport_eligible][google.cloud.kms.v1.CryptoKeyVersion.reimport_eligible]
    // and the original key material is reimported with a call to
    // [KeyManagementService.ImportCryptoKeyVersion][google.cloud.kms.v1.KeyManagementService.ImportCryptoKeyVersion].
    DESTROYED = 3;

    // This version is scheduled for destruction, and will be destroyed soon.
    // Call
    // [RestoreCryptoKeyVersion][google.cloud.kms.v1.KeyManagementService.RestoreCryptoKeyVersion]
    // to put it back into the
    // [DISABLED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.DISABLED]
    // state.
    DESTROY_SCHEDULED = 4;

    // This version is still being imported. It may not be used, enabled,
    // disabled, or destroyed yet. Cloud KMS will automatically mark this
    // version
    // [ENABLED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.ENABLED]
    // as soon as the version is ready.
    PENDING_IMPORT = 6;

    // This version was not imported successfully. It may not be used, enabled,
    // disabled, or destroyed. The submitted key material has been discarded.
    // Additional details can be found in
    // [CryptoKeyVersion.import_failure_reason][google.cloud.kms.v1.CryptoKeyVersion.import_failure_reason].
    IMPORT_FAILED = 7;

    // This version was not generated successfully. It may not be used, enabled,
    // disabled, or destroyed. Additional details can be found in
    // [CryptoKeyVersion.generation_failure_reason][google.cloud.kms.v1.CryptoKeyVersion.generation_failure_reason].
    GENERATION_FAILED = 8;

    // This version was destroyed, and it may not be used or enabled again.
    // Cloud KMS is waiting for the corresponding key material residing in an
    // external key manager to be destroyed.
    PENDING_EXTERNAL_DESTRUCTION = 9;

    // This version was destroyed, and it may not be used or enabled again.
    // However, Cloud KMS could not confirm that the corresponding key material
    // residing in an external key manager was destroyed. Additional details can
    // be found in
    // [CryptoKeyVersion.external_destruction_failure_reason][google.cloud.kms.v1.CryptoKeyVersion.external_destruction_failure_reason].
    EXTERNAL_DESTRUCTION_FAILED = 10;
  }

  // A view for [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion]s.
  // Controls the level of detail returned for
  // [CryptoKeyVersions][google.cloud.kms.v1.CryptoKeyVersion] in
  // [KeyManagementService.ListCryptoKeyVersions][google.cloud.kms.v1.KeyManagementService.ListCryptoKeyVersions]
  // and
  // [KeyManagementService.ListCryptoKeys][google.cloud.kms.v1.KeyManagementService.ListCryptoKeys].
  enum CryptoKeyVersionView {
    // Default view for each
    // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion]. Does not
    // include the
    // [attestation][google.cloud.kms.v1.CryptoKeyVersion.attestation] field.
    CRYPTO_KEY_VERSION_VIEW_UNSPECIFIED = 0;

    // Provides all fields in each
    // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion], including the
    // [attestation][google.cloud.kms.v1.CryptoKeyVersion.attestation].
    FULL = 1;
  }

  // Output only. The resource name for this
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] in the format
  // `projects/*/locations/*/keyRings/*/cryptoKeys/*/cryptoKeyVersions/*`.
  string name = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // The current state of the
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion].
  CryptoKeyVersionState state = 3;

  // Output only. The [ProtectionLevel][google.cloud.kms.v1.ProtectionLevel]
  // describing how crypto operations are performed with this
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion].
  ProtectionLevel protection_level = 7
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The
  // [CryptoKeyVersionAlgorithm][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionAlgorithm]
  // that this [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion]
  // supports.
  CryptoKeyVersionAlgorithm algorithm = 10
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Statement that was generated and signed by the HSM at key
  // creation time. Use this statement to verify attributes of the key as stored
  // on the HSM, independently of Google. Only provided for key versions with
  // [protection_level][google.cloud.kms.v1.CryptoKeyVersion.protection_level]
  // [HSM][google.cloud.kms.v1.ProtectionLevel.HSM].
  KeyOperationAttestation attestation = 8
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time at which this
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] was created.
  google.protobuf.Timestamp create_time = 4
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time this
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion]'s key material was
  // generated.
  google.protobuf.Timestamp generate_time = 11
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time this
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion]'s key material is
  // scheduled for destruction. Only present if
  // [state][google.cloud.kms.v1.CryptoKeyVersion.state] is
  // [DESTROY_SCHEDULED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.DESTROY_SCHEDULED].
  google.protobuf.Timestamp destroy_time = 5
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time this CryptoKeyVersion's key material was
  // destroyed. Only present if
  // [state][google.cloud.kms.v1.CryptoKeyVersion.state] is
  // [DESTROYED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.DESTROYED].
  google.protobuf.Timestamp destroy_event_time = 6
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The name of the [ImportJob][google.cloud.kms.v1.ImportJob]
  // used in the most recent import of this
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion]. Only present if
  // the underlying key material was imported.
  string import_job = 14 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time at which this
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion]'s key material was
  // most recently imported.
  google.protobuf.Timestamp import_time = 15
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The root cause of the most recent import failure. Only present
  // if [state][google.cloud.kms.v1.CryptoKeyVersion.state] is
  // [IMPORT_FAILED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.IMPORT_FAILED].
  string import_failure_reason = 16 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The root cause of the most recent generation failure. Only
  // present if [state][google.cloud.kms.v1.CryptoKeyVersion.state] is
  // [GENERATION_FAILED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.GENERATION_FAILED].
  string generation_failure_reason = 19
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The root cause of the most recent external destruction
  // failure. Only present if
  // [state][google.cloud.kms.v1.CryptoKeyVersion.state] is
  // [EXTERNAL_DESTRUCTION_FAILED][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionState.EXTERNAL_DESTRUCTION_FAILED].
  string external_destruction_failure_reason = 20
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // ExternalProtectionLevelOptions stores a group of additional fields for
  // configuring a [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] that
  // are specific to the
  // [EXTERNAL][google.cloud.kms.v1.ProtectionLevel.EXTERNAL] protection level
  // and [EXTERNAL_VPC][google.cloud.kms.v1.ProtectionLevel.EXTERNAL_VPC]
  // protection levels.
  ExternalProtectionLevelOptions external_protection_level_options = 17;

  // Output only. Whether or not this key version is eligible for reimport, by
  // being specified as a target in
  // [ImportCryptoKeyVersionRequest.crypto_key_version][google.cloud.kms.v1.ImportCryptoKeyVersionRequest.crypto_key_version].
  bool reimport_eligible = 18 [(google.api.field_behavior) = OUTPUT_ONLY];
}

// Data with integrity verification field.
message ChecksummedData {
  // Raw Data.
  bytes data = 3;

  // Integrity verification field. A CRC32C
  // checksum of the returned
  // [ChecksummedData.data][google.cloud.kms.v1.ChecksummedData.data]. An
  // integrity check of
  // [ChecksummedData.data][google.cloud.kms.v1.ChecksummedData.data] can be
  // performed by computing the CRC32C checksum of
  // [ChecksummedData.data][google.cloud.kms.v1.ChecksummedData.data] and
  // comparing your results to this field. Discard the response in case of
  // non-matching checksum values, and perform a limited number of retries. A
  // persistent mismatch may indicate an issue in your computation of the CRC32C
  // checksum. Note: This field is defined as int64 for reasons of compatibility
  // across different languages. However, it is a non-negative integer, which
  // will never exceed `2^32-1`, and can be safely downconverted to uint32 in
  // languages that support this type.
  google.protobuf.Int64Value crc32c_checksum = 2;
}

// The public keys for a given
// [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion]. Obtained via
// [GetPublicKey][google.cloud.kms.v1.KeyManagementService.GetPublicKey].
message PublicKey {
  option (google.api.resource) = {
    type: "cloudkms.googleapis.com/PublicKey"
    pattern: "projects/{project}/locations/{location}/keyRings/{key_ring}/cryptoKeys/{crypto_key}/cryptoKeyVersions/{crypto_key_version}/publicKey"
  };

  // The supported [PublicKey][google.cloud.kms.v1.PublicKey] formats.
  enum PublicKeyFormat {
    // If the
    // [public_key_format][google.cloud.kms.v1.GetPublicKeyRequest.public_key_format]
    // field is not specified:
    // - For PQC algorithms, an error will be returned.
    // - For non-PQC algorithms, the default format is PEM, and the field
    //   [pem][google.cloud.kms.v1.PublicKey.pem] will be populated.
    //
    // Otherwise, the public key will be exported through the
    // [public_key][google.cloud.kms.v1.PublicKey.public_key] field in the
    // requested format.
    PUBLIC_KEY_FORMAT_UNSPECIFIED = 0;

    // The returned public key will be encoded in PEM format.
    // See the [RFC7468](https://tools.ietf.org/html/rfc7468) sections for
    // [General Considerations](https://tools.ietf.org/html/rfc7468#section-2)
    // and [Textual Encoding of Subject Public Key Info]
    // (https://tools.ietf.org/html/rfc7468#section-13) for more information.
    PEM = 1;

    // This is supported only for PQC algorithms.
    // The key material is returned in the format defined by NIST PQC
    // standards (FIPS 203, FIPS 204, and FIPS 205).
    NIST_PQC = 3;
  }

  // The public key, encoded in PEM format. For more information, see the
  // [RFC 7468](https://tools.ietf.org/html/rfc7468) sections for
  // [General Considerations](https://tools.ietf.org/html/rfc7468#section-2) and
  // [Textual Encoding of Subject Public Key Info]
  // (https://tools.ietf.org/html/rfc7468#section-13).
  string pem = 1;

  // The
  // [Algorithm][google.cloud.kms.v1.CryptoKeyVersion.CryptoKeyVersionAlgorithm]
  // associated with this key.
  CryptoKeyVersion.CryptoKeyVersionAlgorithm algorithm = 2;

  // Integrity verification field. A CRC32C checksum of the returned
  // [PublicKey.pem][google.cloud.kms.v1.PublicKey.pem]. An integrity check of
  // [PublicKey.pem][google.cloud.kms.v1.PublicKey.pem] can be performed by
  // computing the CRC32C checksum of
  // [PublicKey.pem][google.cloud.kms.v1.PublicKey.pem] and comparing your
  // results to this field. Discard the response in case of non-matching
  // checksum values, and perform a limited number of retries. A persistent
  // mismatch may indicate an issue in your computation of the CRC32C checksum.
  // Note: This field is defined as int64 for reasons of compatibility across
  // different languages. However, it is a non-negative integer, which will
  // never exceed `2^32-1`, and can be safely downconverted to uint32 in
  // languages that support this type.
  //
  // NOTE: This field is in Beta.
  google.protobuf.Int64Value pem_crc32c = 3;

  // The [name][google.cloud.kms.v1.CryptoKeyVersion.name] of the
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] public key.
  // Provided here for verification.
  //
  // NOTE: This field is in Beta.
  string name = 4;

  // The [ProtectionLevel][google.cloud.kms.v1.ProtectionLevel] of the
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] public key.
  ProtectionLevel protection_level = 5;

  // The [PublicKey][google.cloud.kms.v1.PublicKey] format specified by the
  // customer through the
  // [public_key_format][google.cloud.kms.v1.GetPublicKeyRequest.public_key_format]
  // field.
  PublicKeyFormat public_key_format = 7;

  // This field contains the public key (with integrity verification), formatted
  // according to the
  // [public_key_format][google.cloud.kms.v1.PublicKey.public_key_format] field.
  ChecksummedData public_key = 8;
}

// An [ImportJob][google.cloud.kms.v1.ImportJob] can be used to create
// [CryptoKeys][google.cloud.kms.v1.CryptoKey] and
// [CryptoKeyVersions][google.cloud.kms.v1.CryptoKeyVersion] using pre-existing
// key material, generated outside of Cloud KMS.
//
// When an [ImportJob][google.cloud.kms.v1.ImportJob] is created, Cloud KMS will
// generate a "wrapping key", which is a public/private key pair. You use the
// wrapping key to encrypt (also known as wrap) the pre-existing key material to
// protect it during the import process. The nature of the wrapping key depends
// on the choice of
// [import_method][google.cloud.kms.v1.ImportJob.import_method]. When the
// wrapping key generation is complete, the
// [state][google.cloud.kms.v1.ImportJob.state] will be set to
// [ACTIVE][google.cloud.kms.v1.ImportJob.ImportJobState.ACTIVE] and the
// [public_key][google.cloud.kms.v1.ImportJob.public_key] can be fetched. The
// fetched public key can then be used to wrap your pre-existing key material.
//
// Once the key material is wrapped, it can be imported into a new
// [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] in an existing
// [CryptoKey][google.cloud.kms.v1.CryptoKey] by calling
// [ImportCryptoKeyVersion][google.cloud.kms.v1.KeyManagementService.ImportCryptoKeyVersion].
// Multiple [CryptoKeyVersions][google.cloud.kms.v1.CryptoKeyVersion] can be
// imported with a single [ImportJob][google.cloud.kms.v1.ImportJob]. Cloud KMS
// uses the private key portion of the wrapping key to unwrap the key material.
// Only Cloud KMS has access to the private key.
//
// An [ImportJob][google.cloud.kms.v1.ImportJob] expires 3 days after it is
// created. Once expired, Cloud KMS will no longer be able to import or unwrap
// any key material that was wrapped with the
// [ImportJob][google.cloud.kms.v1.ImportJob]'s public key.
//
// For more information, see
// [Importing a key](https://cloud.google.com/kms/docs/importing-a-key).
message ImportJob {
  option (google.api.resource) = {
    type: "cloudkms.googleapis.com/ImportJob"
    pattern: "projects/{project}/locations/{location}/keyRings/{key_ring}/importJobs/{import_job}"
  };

  // [ImportMethod][google.cloud.kms.v1.ImportJob.ImportMethod] describes the
  // key wrapping method chosen for this
  // [ImportJob][google.cloud.kms.v1.ImportJob].
  enum ImportMethod {
    // Not specified.
    IMPORT_METHOD_UNSPECIFIED = 0;

    // This ImportMethod represents the CKM_RSA_AES_KEY_WRAP key wrapping
    // scheme defined in the PKCS #11 standard. In summary, this involves
    // wrapping the raw key with an ephemeral AES key, and wrapping the
    // ephemeral AES key with a 3072 bit RSA key. For more details, see
    // [RSA AES key wrap
    // mechanism](http://docs.oasis-open.org/pkcs11/pkcs11-curr/v2.40/cos01/pkcs11-curr-v2.40-cos01.html#_Toc408226908).
    RSA_OAEP_3072_SHA1_AES_256 = 1;

    // This ImportMethod represents the CKM_RSA_AES_KEY_WRAP key wrapping
    // scheme defined in the PKCS #11 standard. In summary, this involves
    // wrapping the raw key with an ephemeral AES key, and wrapping the
    // ephemeral AES key with a 4096 bit RSA key. For more details, see
    // [RSA AES key wrap
    // mechanism](http://docs.oasis-open.org/pkcs11/pkcs11-curr/v2.40/cos01/pkcs11-curr-v2.40-cos01.html#_Toc408226908).
    RSA_OAEP_4096_SHA1_AES_256 = 2;

    // This ImportMethod represents the CKM_RSA_AES_KEY_WRAP key wrapping
    // scheme defined in the PKCS #11 standard. In summary, this involves
    // wrapping the raw key with an ephemeral AES key, and wrapping the
    // ephemeral AES key with a 3072 bit RSA key. For more details, see
    // [RSA AES key wrap
    // mechanism](http://docs.oasis-open.org/pkcs11/pkcs11-curr/v2.40/cos01/pkcs11-curr-v2.40-cos01.html#_Toc408226908).
    RSA_OAEP_3072_SHA256_AES_256 = 3;

    // This ImportMethod represents the CKM_RSA_AES_KEY_WRAP key wrapping
    // scheme defined in the PKCS #11 standard. In summary, this involves
    // wrapping the raw key with an ephemeral AES key, and wrapping the
    // ephemeral AES key with a 4096 bit RSA key. For more details, see
    // [RSA AES key wrap
    // mechanism](http://docs.oasis-open.org/pkcs11/pkcs11-curr/v2.40/cos01/pkcs11-curr-v2.40-cos01.html#_Toc408226908).
    RSA_OAEP_4096_SHA256_AES_256 = 4;

    // This ImportMethod represents RSAES-OAEP with a 3072 bit RSA key. The
    // key material to be imported is wrapped directly with the RSA key. Due
    // to technical limitations of RSA wrapping, this method cannot be used to
    // wrap RSA keys for import.
    RSA_OAEP_3072_SHA256 = 5;

    // This ImportMethod represents RSAES-OAEP with a 4096 bit RSA key. The
    // key material to be imported is wrapped directly with the RSA key. Due
    // to technical limitations of RSA wrapping, this method cannot be used to
    // wrap RSA keys for import.
    RSA_OAEP_4096_SHA256 = 6;
  }

  // The state of the [ImportJob][google.cloud.kms.v1.ImportJob], indicating if
  // it can be used.
  enum ImportJobState {
    // Not specified.
    IMPORT_JOB_STATE_UNSPECIFIED = 0;

    // The wrapping key for this job is still being generated. It may not be
    // used. Cloud KMS will automatically mark this job as
    // [ACTIVE][google.cloud.kms.v1.ImportJob.ImportJobState.ACTIVE] as soon as
    // the wrapping key is generated.
    PENDING_GENERATION = 1;

    // This job may be used in
    // [CreateCryptoKey][google.cloud.kms.v1.KeyManagementService.CreateCryptoKey]
    // and
    // [CreateCryptoKeyVersion][google.cloud.kms.v1.KeyManagementService.CreateCryptoKeyVersion]
    // requests.
    ACTIVE = 2;

    // This job can no longer be used and may not leave this state once entered.
    EXPIRED = 3;
  }

  // The public key component of the wrapping key. For details of the type of
  // key this public key corresponds to, see the
  // [ImportMethod][google.cloud.kms.v1.ImportJob.ImportMethod].
  message WrappingPublicKey {
    // The public key, encoded in PEM format. For more information, see the [RFC
    // 7468](https://tools.ietf.org/html/rfc7468) sections for [General
    // Considerations](https://tools.ietf.org/html/rfc7468#section-2) and
    // [Textual Encoding of Subject Public Key Info]
    // (https://tools.ietf.org/html/rfc7468#section-13).
    string pem = 1;
  }

  // Output only. The resource name for this
  // [ImportJob][google.cloud.kms.v1.ImportJob] in the format
  // `projects/*/locations/*/keyRings/*/importJobs/*`.
  string name = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Required. Immutable. The wrapping method to be used for incoming key
  // material.
  ImportMethod import_method = 2 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.field_behavior) = IMMUTABLE
  ];

  // Required. Immutable. The protection level of the
  // [ImportJob][google.cloud.kms.v1.ImportJob]. This must match the
  // [protection_level][google.cloud.kms.v1.CryptoKeyVersionTemplate.protection_level]
  // of the [version_template][google.cloud.kms.v1.CryptoKey.version_template]
  // on the [CryptoKey][google.cloud.kms.v1.CryptoKey] you attempt to import
  // into.
  ProtectionLevel protection_level = 9 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.field_behavior) = IMMUTABLE
  ];

  // Output only. The time at which this
  // [ImportJob][google.cloud.kms.v1.ImportJob] was created.
  google.protobuf.Timestamp create_time = 3
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time this [ImportJob][google.cloud.kms.v1.ImportJob]'s key
  // material was generated.
  google.protobuf.Timestamp generate_time = 4
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time at which this
  // [ImportJob][google.cloud.kms.v1.ImportJob] is scheduled for expiration and
  // can no longer be used to import key material.
  google.protobuf.Timestamp expire_time = 5
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The time this [ImportJob][google.cloud.kms.v1.ImportJob]
  // expired. Only present if [state][google.cloud.kms.v1.ImportJob.state] is
  // [EXPIRED][google.cloud.kms.v1.ImportJob.ImportJobState.EXPIRED].
  google.protobuf.Timestamp expire_event_time = 10
      [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The current state of the
  // [ImportJob][google.cloud.kms.v1.ImportJob], indicating if it can be used.
  ImportJobState state = 6 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The public key with which to wrap key material prior to
  // import. Only returned if [state][google.cloud.kms.v1.ImportJob.state] is
  // [ACTIVE][google.cloud.kms.v1.ImportJob.ImportJobState.ACTIVE].
  WrappingPublicKey public_key = 7 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. Statement that was generated and signed by the key creator
  // (for example, an HSM) at key creation time. Use this statement to verify
  // attributes of the key as stored on the HSM, independently of Google.
  // Only present if the chosen
  // [ImportMethod][google.cloud.kms.v1.ImportJob.ImportMethod] is one with a
  // protection level of [HSM][google.cloud.kms.v1.ProtectionLevel.HSM].
  KeyOperationAttestation attestation = 8
      [(google.api.field_behavior) = OUTPUT_ONLY];
}

// ExternalProtectionLevelOptions stores a group of additional fields for
// configuring a [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] that
// are specific to the [EXTERNAL][google.cloud.kms.v1.ProtectionLevel.EXTERNAL]
// protection level and
// [EXTERNAL_VPC][google.cloud.kms.v1.ProtectionLevel.EXTERNAL_VPC] protection
// levels.
message ExternalProtectionLevelOptions {
  // The URI for an external resource that this
  // [CryptoKeyVersion][google.cloud.kms.v1.CryptoKeyVersion] represents.
  string external_key_uri = 1;

  // The path to the external key material on the EKM when using
  // [EkmConnection][google.cloud.kms.v1.EkmConnection] e.g., "v0/my/key". Set
  // this field instead of external_key_uri when using an
  // [EkmConnection][google.cloud.kms.v1.EkmConnection].
  string ekm_connection_key_path = 2;
}

// A
// [KeyAccessJustificationsPolicy][google.cloud.kms.v1.KeyAccessJustificationsPolicy]
// specifies zero or more allowed
// [AccessReason][google.cloud.kms.v1.AccessReason] values for encrypt, decrypt,
// and sign operations on a [CryptoKey][google.cloud.kms.v1.CryptoKey].
message KeyAccessJustificationsPolicy {
  // The list of allowed reasons for access to a
  // [CryptoKey][google.cloud.kms.v1.CryptoKey]. Zero allowed access reasons
  // means all encrypt, decrypt, and sign operations for the
  // [CryptoKey][google.cloud.kms.v1.CryptoKey] associated with this policy will
  // fail.
  repeated AccessReason allowed_access_reasons = 1;
}

// [ProtectionLevel][google.cloud.kms.v1.ProtectionLevel] specifies how
// cryptographic operations are performed. For more information, see [Protection
// levels] (https://cloud.google.com/kms/docs/algorithms#protection_levels).
enum ProtectionLevel {
  // Not specified.
  PROTECTION_LEVEL_UNSPECIFIED = 0;

  // Crypto operations are performed in software.
  SOFTWARE = 1;

  // Crypto operations are performed in a Hardware Security Module.
  HSM = 2;

  // Crypto operations are performed by an external key manager.
  EXTERNAL = 3;

  // Crypto operations are performed in an EKM-over-VPC backend.
  EXTERNAL_VPC = 4;
}

// Describes the reason for a data access. Please refer to
// https://cloud.google.com/assured-workloads/key-access-justifications/docs/justification-codes
// for the detailed semantic meaning of justification reason codes.
enum AccessReason {
  // Unspecified access reason.
  REASON_UNSPECIFIED = 0;

  // Customer-initiated support.
  CUSTOMER_INITIATED_SUPPORT = 1;

  // Google-initiated access for system management and troubleshooting.
  GOOGLE_INITIATED_SERVICE = 2;

  // Google-initiated access in response to a legal request or legal process.
  THIRD_PARTY_DATA_REQUEST = 3;

  // Google-initiated access for security, fraud, abuse, or compliance purposes.
  GOOGLE_INITIATED_REVIEW = 4;

  // Customer uses their account to perform any access to their own data which
  // their IAM policy authorizes.
  CUSTOMER_INITIATED_ACCESS = 5;

  // Google systems access customer data to help optimize the structure of the
  // data or quality for future uses by the customer.
  GOOGLE_INITIATED_SYSTEM_OPERATION = 6;

  // No reason is expected for this key request.
  REASON_NOT_EXPECTED = 7;

  // Customer uses their account to perform any access to their own data which
  // their IAM policy authorizes, and one of the following is true:
  //
  // * A Google administrator has reset the root-access account associated with
  //   the user's organization within the past 7 days.
  // * A Google-initiated emergency access operation has interacted with a
  //   resource in the same project or folder as the currently accessed resource
  //   within the past 7 days.
  MODIFIED_CUSTOMER_INITIATED_ACCESS = 8;

  // Google systems access customer data to help optimize the structure of the
  // data or quality for future uses by the customer, and one of the following
  // is true:
  //
  // * A Google administrator has reset the root-access account associated with
  //   the user's organization within the past 7 days.
  // * A Google-initiated emergency access operation has interacted with a
  //   resource in the same project or folder as the currently accessed resource
  //   within the past 7 days.
  MODIFIED_GOOGLE_INITIATED_SYSTEM_OPERATION = 9;

  // Google-initiated access to maintain system reliability.
  GOOGLE_RESPONSE_TO_PRODUCTION_ALERT = 10;

  // One of the following operations is being executed while simultaneously
  // encountering an internal technical issue which prevented a more precise
  // justification code from being generated:
  //
  // * Your account has been used to perform any access to your own data which
  //   your IAM policy authorizes.
  // * An automated Google system operates on encrypted customer data which your
  //   IAM policy authorizes.
  // * Customer-initiated Google support access.
  // * Google-initiated support access to protect system reliability.
  CUSTOMER_AUTHORIZED_WORKFLOW_SERVICING = 11;
}
