Generate key transfer blob using HSM vendor provided BYOK tool

Use the HSM Vendor provided BYOK tool to create a key transfer blob (stored as a ".byok" file). KEK public key as a .Privacy-Enhanced Mail (.pem file) will be one of the inputs to this tool.

Key Transfer Blob

Long term, Microsoft would like to use PKCS#11 CKM_RSA_AES_KEY_WRAP mechanism to transfer the target key to Azure Key Vault since this mechanism produces a single blob and, more importantly, the intermediate AES key is handled by the two HSMs and is guaranteed to be ephemeral. This mechanism isn't presently available in some HSMs but the combination of protecting the target key with CKM_AES_KEY_WRAP_PAD using an AES key and protecting the AES key with CKM_RSA_PKCS_OAEP produces an equivalent blob.

The target key plaintext depends on the key type:

  • For an RSA key, the private key ASN.1 DER encoding [RFC3447] wrapped in PKCS#8 [RFC5208]
  • For an EC key, the private key ASN.1 DER encoding [RFC5915] wrapped in PKCS#8 [RFC5208]
  • For an octet key, the raw bytes of the key

The bytes for the plaintext key are then transformed using the CKM_RSA_AES_KEY_WRAP mechanism:

  • An ephemeral AES key is generated and encrypted with the wrapping RSA key using RSA-OAEP with SHA1.
  • The encoded plaintext key is encrypted using the AES key using AES Key Wrap with Padding.
  • The encrypted AES key and the encrypted plaintext key are concatenated to produce the final ciphertext blob.

The format of the transfer blob uses JSON Web Encryption compact serialization (RFC7516) primarily as a vehicle for delivering the required metadata to the service for correct decryption.


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