NAME

       Esys_HMAC - The ESAPI function for the TPM2_HMAC command.

SYNOPSIS

   Functions
       TSS2_RC Esys_HMAC_Async (ESYS_CONTEXT *esysContext, ESYS_TR handle, ESYS_TR shandle1,
           ESYS_TR shandle2, ESYS_TR shandle3, const TPM2B_MAX_BUFFER *buffer, TPMI_ALG_HASH
           hashAlg)
       TSS2_RC Esys_HMAC (ESYS_CONTEXT *esysContext, ESYS_TR handle, ESYS_TR shandle1, ESYS_TR
           shandle2, ESYS_TR shandle3, const TPM2B_MAX_BUFFER *buffer, TPMI_ALG_HASH hashAlg,
           TPM2B_DIGEST **outHMAC)
       TSS2_RC Esys_HMAC_Finish (ESYS_CONTEXT *esysContext, TPM2B_DIGEST **outHMAC)

Detailed Description

       ESAPI function to invoke the TPM2_HMAC command either as a one-call or in an asynchronous
       manner.

Function Documentation

   TSS2_RC Esys_HMAC (ESYS_CONTEXT * esysContext, ESYS_TR handle, ESYS_TR shandle1, ESYS_TR
       shandle2, ESYS_TR shandle3, const TPM2B_MAX_BUFFER * buffer, TPMI_ALG_HASH hashAlg,
       TPM2B_DIGEST ** outHMAC)
       One-Call function for TPM2_HMAC

       This function invokes the TPM2_HMAC command in a one-call variant. This means the function
       will block until the TPM response is available. All input parameters are const. The memory
       for non-simple output parameters is allocated by the function implementation.

       Parameters
           esysContext The ESYS_CONTEXT.
           handle Handle for the symmetric signing key providing the HMAC key.
           shandle1 Session handle for authorization of handle
           shandle2 Second session handle.
           shandle3 Third session handle.
           buffer HMAC data.
           hashAlg Algorithm to use for HMAC.
           outHMAC The returned HMAC in a sized buffer. (callee-allocated)

       Return values
           TSS2_RC_SUCCESS if the function call was a success.
           TSS2_ESYS_RC_BAD_REFERENCE if the esysContext or required input pointers or required
           output handle references are NULL.
           TSS2_ESYS_RC_BAD_CONTEXT if esysContext corruption is detected.
           TSS2_ESYS_RC_MEMORY if the ESAPI cannot allocate enough memory for internal operations
           or return parameters.
           TSS2_ESYS_RC_BAD_SEQUENCE if the context has an asynchronous operation already
           pending.
           TSS2_ESYS_RC_INSUFFICIENT_RESPONSE if the TPM's response does not at least contain the
           tag, response length, and response code.
           TSS2_ESYS_RC_MALFORMED_RESPONSE if the TPM's response is corrupted.
           TSS2_ESYS_RC_RSP_AUTH_FAILED if the response HMAC from the TPM did not verify.
           TSS2_ESYS_RC_MULTIPLE_DECRYPT_SESSIONS if more than one session has the 'decrypt'
           attribute bit set.
           TSS2_ESYS_RC_MULTIPLE_ENCRYPT_SESSIONS if more than one session has the 'encrypt'
           attribute bit set.
           TSS2_ESYS_RC_BAD_TR if any of the ESYS_TR objects are unknown to the ESYS_CONTEXT or
           are of the wrong type or if required ESYS_TR objects are ESYS_TR_NONE.
           TSS2_RCs produced by lower layers of the software stack may be returned to the caller
           unaltered unless handled internally.

   TSS2_RC Esys_HMAC_Async (ESYS_CONTEXT * esysContext, ESYS_TR handle, ESYS_TR shandle1, ESYS_TR
       shandle2, ESYS_TR shandle3, const TPM2B_MAX_BUFFER * buffer, TPMI_ALG_HASH hashAlg)
       Asynchronous function for TPM2_HMAC

       This function invokes the TPM2_HMAC command in a asynchronous variant. This means the
       function will return as soon as the command has been sent downwards the stack to the TPM.
       All input parameters are const. In order to retrieve the TPM's response call
       Esys_HMAC_Finish.

       Parameters
           esysContext The ESYS_CONTEXT.
           handle Handle for the symmetric signing key providing the HMAC key.
           shandle1 Session handle for authorization of handle
           shandle2 Second session handle.
           shandle3 Third session handle.
           buffer HMAC data.
           hashAlg Algorithm to use for HMAC.

       Return values
           ESYS_RC_SUCCESS if the function call was a success.
           TSS2_ESYS_RC_BAD_REFERENCE if the esysContext or required input pointers or required
           output handle references are NULL.
           TSS2_ESYS_RC_BAD_CONTEXT if esysContext corruption is detected.
           TSS2_ESYS_RC_MEMORY if the ESAPI cannot allocate enough memory for internal operations
           or return parameters.
           TSS2_RCs produced by lower layers of the software stack may be returned to the caller
           unaltered unless handled internally.
           TSS2_ESYS_RC_MULTIPLE_DECRYPT_SESSIONS if more than one session has the 'decrypt'
           attribute bit set.
           TSS2_ESYS_RC_MULTIPLE_ENCRYPT_SESSIONS if more than one session has the 'encrypt'
           attribute bit set.
           TSS2_ESYS_RC_BAD_TR if any of the ESYS_TR objects are unknown to the ESYS_CONTEXT or
           are of the wrong type or if required ESYS_TR objects are ESYS_TR_NONE.

   TSS2_RC Esys_HMAC_Finish (ESYS_CONTEXT * esysContext, TPM2B_DIGEST ** outHMAC)
       Asynchronous finish function for TPM2_HMAC

       This function returns the results of a TPM2_HMAC command invoked via Esys_HMAC_Finish. All
       non-simple output parameters are allocated by the function's implementation. NULL can be
       passed for every output parameter if the value is not required.

       Parameters
           esysContext The ESYS_CONTEXT.
           outHMAC The returned HMAC in a sized buffer. (callee-allocated)

       Return values
           TSS2_RC_SUCCESS on success
           ESYS_RC_SUCCESS if the function call was a success.
           TSS2_ESYS_RC_BAD_REFERENCE if the esysContext or required input pointers or required
           output handle references are NULL.
           TSS2_ESYS_RC_BAD_CONTEXT if esysContext corruption is detected.
           TSS2_ESYS_RC_MEMORY if the ESAPI cannot allocate enough memory for internal operations
           or return parameters.
           TSS2_ESYS_RC_BAD_SEQUENCE if the context has an asynchronous operation already
           pending.
           TSS2_ESYS_RC_TRY_AGAIN if the timeout counter expires before the TPM response is
           received.
           TSS2_ESYS_RC_INSUFFICIENT_RESPONSE if the TPM's response does not at least contain the
           tag, response length, and response code.
           TSS2_ESYS_RC_RSP_AUTH_FAILED if the response HMAC from the TPM did not verify.
           TSS2_ESYS_RC_MALFORMED_RESPONSE if the TPM's response is corrupted.
           TSS2_RCs produced by lower layers of the software stack may be returned to the caller
           unaltered unless handled internally.

Author

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