Amazon KMS Sign and Verify

arazzo: 1.0.1
info:
  title: Amazon KMS Sign and Verify
  summary: Sign a message with an asymmetric KMS key, then verify the signature.
  description: >-
    Exercises the asymmetric signing path of KMS. The workflow creates a digital
    signature for a message using an asymmetric KMS key and then verifies that
    signature against the same message and signing algorithm to confirm
    authenticity. The signature blob from the sign step is chained into the
    verify step. Each step spells out its request inline, including the AWS JSON
    protocol X-Amz-Target header, so the flow can be read and executed without
    opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: kmsApi
  url: ../openapi/amazon-kms-openapi.yml
  type: openapi
workflows:
- workflowId: sign-and-verify
  summary: Sign a message with an asymmetric key then verify the resulting signature.
  description: >-
    Produces a digital signature for the supplied message using an asymmetric
    KMS key and verifies that signature to confirm it is valid for the message
    and algorithm.
  inputs:
    type: object
    required:
    - KeyId
    - Message
    - SigningAlgorithm
    properties:
      KeyId:
        type: string
        description: Identifies the asymmetric KMS key used to sign and verify.
      Message:
        type: string
        description: Base64-encoded message (or digest) to sign.
      MessageType:
        type: string
        description: Whether Message is RAW data or a DIGEST.
      SigningAlgorithm:
        type: string
        description: The signing algorithm to use (e.g. RSASSA_PSS_SHA_256).
  steps:
  - stepId: sign
    description: >-
      Create a digital signature for the supplied message using the asymmetric
      KMS key and chosen signing algorithm.
    operationId: Sign
    parameters:
    - name: KeyId
      in: path
      value: $inputs.KeyId
    - name: X-Amz-Target
      in: header
      value: TrentService.Sign
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        KeyId: $inputs.KeyId
        Message: $inputs.Message
        MessageType: $inputs.MessageType
        SigningAlgorithm: $inputs.SigningAlgorithm
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      signature: $response.body#/Signature
  - stepId: verify
    description: >-
      Verify the signature produced by the sign step against the same message
      and signing algorithm to confirm it is valid.
    operationId: Verify
    parameters:
    - name: KeyId
      in: path
      value: $inputs.KeyId
    - name: X-Amz-Target
      in: header
      value: TrentService.Verify
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        KeyId: $inputs.KeyId
        Message: $inputs.Message
        MessageType: $inputs.MessageType
        Signature: $steps.sign.outputs.signature
        SigningAlgorithm: $inputs.SigningAlgorithm
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      signatureValid: $response.body#/SignatureValid
  outputs:
    signature: $steps.sign.outputs.signature
    signatureValid: $steps.verify.outputs.signatureValid