Esys_StartAuthSession

NAME

Esys_StartAuthSession − The ESAPI function for the TPM2_StartAuthSession command.

SYNOPSIS

Functions

TSS2_RC Esys_StartAuthSession_Async (ESYS_CONTEXT *esysContext, ESYS_TR tpmKey, ESYS_TR bind, ESYS_TR shandle1, ESYS_TR shandle2, ESYS_TR shandle3, const TPM2B_NONCE *nonceCaller, TPM2_SE sessionType, const TPMT_SYM_DEF *symmetric, TPMI_ALG_HASH authHash)
TSS2_RC Esys_StartAuthSession (ESYS_CONTEXT *esysContext, ESYS_TR tpmKey, ESYS_TR bind, ESYS_TR shandle1, ESYS_TR shandle2, ESYS_TR shandle3, const TPM2B_NONCE *nonceCaller, TPM2_SE sessionType, const TPMT_SYM_DEF *symmetric, TPMI_ALG_HASH authHash, ESYS_TR *sessionHandle)

Detailed Description

ESAPI function to invoke the TPM2_StartAuthSession command either as a one-call or in an asynchronous manner.

Function Documentation

TSS2_RC Esys_StartAuthSession (ESYS_CONTEXT * esysContext, ESYS_TR tpmKey, ESYS_TR bind, ESYS_TR shandle1, ESYS_TR shandle2, ESYS_TR shandle3, const TPM2B_NONCE * nonceCaller, TPM2_SE sessionType, const TPMT_SYM_DEF * symmetric, TPMI_ALG_HASH authHash, ESYS_TR * sessionHandle)
One-Call function for TPM2_StartAuthSession

This function invokes the TPM2_StartAuthSession 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.
tpmKey
Handle of a loaded decrypt key used to encrypt salt.
bind
Entity providing the authValue.
shandle1
First session handle.
shandle2
Second session handle.
shandle3
Third session handle.
nonceCaller
Initial nonceCaller, sets nonceTPM size for the session.
sessionType
Indicates the type of the session; simple HMAC or policy (including a trial policy).
symmetric
The algorithm and key size for parameter encryption.
authHash
Hash algorithm to use for the session.
sessionHandle
ESYS_TR handle of ESYS resource for TPMI_SH_AUTH_SESSION.

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_StartAuthSession_Async (ESYS_CONTEXT * esysContext, ESYS_TR tpmKey, ESYS_TR bind, ESYS_TR shandle1, ESYS_TR shandle2, ESYS_TR shandle3, const TPM2B_NONCE * nonceCaller, TPM2_SE sessionType, const TPMT_SYM_DEF * symmetric, TPMI_ALG_HASH authHash)
Asynchronous function for TPM2_StartAuthSession

This function invokes the TPM2_StartAuthSession 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_StartAuthSession_Finish.

Parameters

esysContext The ESYS_CONTEXT.
tpmKey
Handle of a loaded decrypt key used to encrypt salt.
bind
Entity providing the authValue.
shandle1
First session handle.
shandle2
Second session handle.
shandle3
Third session handle.
nonceCaller
Initial nonceCaller, sets nonceTPM size for the session.
sessionType
Indicates the type of the session; simple HMAC or policy (including a trial policy).
symmetric
The algorithm and key size for parameter encryption.
authHash
Hash algorithm to use for the session.

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.

Author

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