Struct tss_esapi::abstraction::transient::TransientKeyContext

pub struct TransientKeyContext { /* private fields */ }

Structure offering an abstracted programming experience.

The TransientKeyContext makes use of a root key from which the other, client-controlled keyes are derived.

Currently, only functionality necessary for RSA key creation and usage (for signing, verifying signatures, encryption and decryption) is implemented. The RSA SSA asymmetric scheme with SHA256 is used for all created and imported signing keys. The RSA OAEP asymmetric scheme with SHA256 is used for all created and imported signing/encryption/decryption keys.

Implementations

impl TransientKeyContext

pub fn get_make_cred_params(
    &mut self,
    object: ObjectWrapper,
    key: Option<ObjectWrapper>
) -> Result<MakeCredParams>

Get the data required to perform a MakeCredential

Parameters

• object - the object whose TPM name will be included in the credential
• key - the key to be used to encrypt the secret that wraps the credential

Note: If no key is given, the default Endorsement Key will be used.

pub fn activate_credential(
    &mut self,
    object: ObjectWrapper,
    key: Option<ObjectWrapper>,
    credential_blob: Vec<u8>,
    secret: Vec<u8>
) -> Result<Vec<u8>>

Perform an ActivateCredential operation for the given object

Parameters

• object - the object whose TPM name is included in the credential
• key - the key used to encrypt the secret that wraps the credential
• credential_blob - encrypted credential that will be returned by the TPM
• secret - encrypted secret that was used to encrypt the credential

Note: if no key is given, the default Endorsement Key will be used. You can find more information about the default Endorsement Key in the ek module.

impl TransientKeyContext

pub fn create_key(
    &mut self,
    key_params: KeyParams,
    auth_size: usize
) -> Result<(KeyMaterial, Option<Auth>)>

Create a new key.

A key is created as a descendant of the context root key, with the given parameters.

If successful, the result contains the KeyMaterial of the key and a vector of bytes forming the authentication value for said key.

Constraints

• auth_size must be at most 32

Errors

• if the authentication size is larger than 32 a WrongParamSize wrapper error is returned

pub fn load_external_public_key(
    &mut self,
    public_key: PublicKey,
    params: KeyParams
) -> Result<KeyMaterial>

Load the public part of a key.

Returns the key context.

pub fn rsa_encrypt(
    &mut self,
    key_material: KeyMaterial,
    key_params: KeyParams,
    key_auth: Option<Auth>,
    message: PublicKeyRsa,
    label: Option<Data>
) -> Result<PublicKeyRsa>

Encrypt a message with an existing key.

Takes the key as a parameter, encrypts the message and returns the ciphertext. A label (i.e. nonce) can also be provided.

pub fn rsa_decrypt(
    &mut self,
    key_material: KeyMaterial,
    key_params: KeyParams,
    key_auth: Option<Auth>,
    ciphertext: PublicKeyRsa,
    label: Option<Data>
) -> Result<PublicKeyRsa>

Decrypt ciphertext with an existing key.

Takes the key as a parameter, decrypts the ciphertext and returns the plaintext. A label (i.e. nonce) can also be provided.

pub fn sign(
    &mut self,
    key_material: KeyMaterial,
    key_params: KeyParams,
    key_auth: Option<Auth>,
    digest: Digest
) -> Result<Signature>

Sign a digest with an existing key.

Takes the key as a parameter, signs and returns the signature.

pub fn verify_signature(
    &mut self,
    key_material: KeyMaterial,
    key_params: KeyParams,
    digest: Digest,
    signature: Signature
) -> Result<VerifiedTicket>

Verify a signature against a digest.

Given a digest, a key and a signature, this method returns a Verified ticket if the verification was successful.

Errors

• if the verification fails (i.e. the signature is invalid), a TPM error is returned

pub fn migrate_key_from_ctx(
    &mut self,
    context: TpmsContext,
    auth: Option<Auth>
) -> Result<KeyMaterial>

Perform a migration from the previous version of the TransientKeyContext.

The original version of the TransientKeyContext used contexts of keys for persistence. This method allows a key persisted in this way to be migrated to the new format.

The method determines on its own whether the loaded key was a keypair or just a public key.

pub fn builder() -> TransientKeyContextBuilder

Get a builder for the structure

Trait Implementations

impl Debug for TransientKeyContext

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.