csu3_am335x/EVSE/GPL/tpm2-tss-3.2.0/doxygen-doc/man/Esys_HMAC.3

.TH "Esys_HMAC" 3 "Fri Oct 7 2022" "Version 3.2.0" "tpm2-tss" \" -*- nroff -*-
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.SH NAME
Esys_HMAC
.SH SYNOPSIS
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.PP
.SS "Functions"

.in +1c
.ti -1c
.RI "TSS2_RC \fBEsys_HMAC_Async\fP (\fBESYS_CONTEXT\fP *esysContext, \fBESYS_TR\fP handle, \fBESYS_TR\fP shandle1, \fBESYS_TR\fP shandle2, \fBESYS_TR\fP shandle3, const TPM2B_MAX_BUFFER *buffer, TPMI_ALG_HASH hashAlg)"
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.ti -1c
.RI "TSS2_RC \fBEsys_HMAC\fP (\fBESYS_CONTEXT\fP *esysContext, \fBESYS_TR\fP handle, \fBESYS_TR\fP shandle1, \fBESYS_TR\fP shandle2, \fBESYS_TR\fP shandle3, const TPM2B_MAX_BUFFER *buffer, TPMI_ALG_HASH hashAlg, TPM2B_DIGEST **outHMAC)"
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.ti -1c
.RI "TSS2_RC \fBEsys_HMAC_Finish\fP (\fBESYS_CONTEXT\fP *esysContext, TPM2B_DIGEST **outHMAC)"
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.in -1c
.SH "Detailed Description"
.PP 
ESAPI function to invoke the TPM2_HMAC command either as a one-call or in an asynchronous manner\&. 
.SH "Function Documentation"
.PP 
.SS "TSS2_RC Esys_HMAC (\fBESYS_CONTEXT\fP * esysContext, \fBESYS_TR\fP handle, \fBESYS_TR\fP shandle1, \fBESYS_TR\fP shandle2, \fBESYS_TR\fP shandle3, const TPM2B_MAX_BUFFER * buffer, TPMI_ALG_HASH hashAlg, TPM2B_DIGEST ** outHMAC)"
One-Call function for TPM2_HMAC
.PP
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\&.
.PP
\fBParameters:\fP
.RS 4
\fIesysContext\fP The \fBESYS_CONTEXT\fP\&. 
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\fIhandle\fP Handle for the symmetric signing key providing the HMAC key\&. 
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\fIshandle1\fP Session handle for authorization of handle 
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\fIshandle2\fP Second session handle\&. 
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\fIshandle3\fP Third session handle\&. 
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\fIbuffer\fP HMAC data\&. 
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\fIhashAlg\fP Algorithm to use for HMAC\&. 
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\fIoutHMAC\fP The returned HMAC in a sized buffer\&. (callee-allocated) 
.RE
.PP
\fBReturn values:\fP
.RS 4
\fITSS2_RC_SUCCESS\fP if the function call was a success\&. 
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\fITSS2_ESYS_RC_BAD_REFERENCE\fP if the esysContext or required input pointers or required output handle references are NULL\&. 
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\fITSS2_ESYS_RC_BAD_CONTEXT\fP if esysContext corruption is detected\&. 
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\fITSS2_ESYS_RC_MEMORY\fP if the ESAPI cannot allocate enough memory for internal operations or return parameters\&. 
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\fITSS2_ESYS_RC_BAD_SEQUENCE\fP if the context has an asynchronous operation already pending\&. 
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\fITSS2_ESYS_RC_INSUFFICIENT_RESPONSE\fP if the TPM's response does not at least contain the tag, response length, and response code\&. 
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\fITSS2_ESYS_RC_MALFORMED_RESPONSE\fP if the TPM's response is corrupted\&. 
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\fITSS2_ESYS_RC_RSP_AUTH_FAILED\fP if the response HMAC from the TPM did not verify\&. 
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\fITSS2_ESYS_RC_MULTIPLE_DECRYPT_SESSIONS\fP if more than one session has the 'decrypt' attribute bit set\&. 
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\fITSS2_ESYS_RC_MULTIPLE_ENCRYPT_SESSIONS\fP if more than one session has the 'encrypt' attribute bit set\&. 
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\fITSS2_ESYS_RC_BAD_TR\fP if any of the ESYS_TR objects are unknown to the \fBESYS_CONTEXT\fP or are of the wrong type or if required ESYS_TR objects are ESYS_TR_NONE\&. 
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\fITSS2_RCs\fP produced by lower layers of the software stack may be returned to the caller unaltered unless handled internally\&. 
.RE
.PP

.SS "TSS2_RC Esys_HMAC_Async (\fBESYS_CONTEXT\fP * esysContext, \fBESYS_TR\fP handle, \fBESYS_TR\fP shandle1, \fBESYS_TR\fP shandle2, \fBESYS_TR\fP shandle3, const TPM2B_MAX_BUFFER * buffer, TPMI_ALG_HASH hashAlg)"
Asynchronous function for TPM2_HMAC
.PP
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\&.
.PP
\fBParameters:\fP
.RS 4
\fIesysContext\fP The \fBESYS_CONTEXT\fP\&. 
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\fIhandle\fP Handle for the symmetric signing key providing the HMAC key\&. 
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\fIshandle1\fP Session handle for authorization of handle 
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\fIshandle2\fP Second session handle\&. 
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\fIshandle3\fP Third session handle\&. 
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\fIbuffer\fP HMAC data\&. 
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\fIhashAlg\fP Algorithm to use for HMAC\&. 
.RE
.PP
\fBReturn values:\fP
.RS 4
\fIESYS_RC_SUCCESS\fP if the function call was a success\&. 
.br
\fITSS2_ESYS_RC_BAD_REFERENCE\fP if the esysContext or required input pointers or required output handle references are NULL\&. 
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\fITSS2_ESYS_RC_BAD_CONTEXT\fP if esysContext corruption is detected\&. 
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\fITSS2_ESYS_RC_MEMORY\fP if the ESAPI cannot allocate enough memory for internal operations or return parameters\&. 
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\fITSS2_RCs\fP produced by lower layers of the software stack may be returned to the caller unaltered unless handled internally\&. 
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\fITSS2_ESYS_RC_MULTIPLE_DECRYPT_SESSIONS\fP if more than one session has the 'decrypt' attribute bit set\&. 
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\fITSS2_ESYS_RC_MULTIPLE_ENCRYPT_SESSIONS\fP if more than one session has the 'encrypt' attribute bit set\&. 
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\fITSS2_ESYS_RC_BAD_TR\fP if any of the ESYS_TR objects are unknown to the \fBESYS_CONTEXT\fP or are of the wrong type or if required ESYS_TR objects are ESYS_TR_NONE\&. 
.RE
.PP

.SS "TSS2_RC Esys_HMAC_Finish (\fBESYS_CONTEXT\fP * esysContext, TPM2B_DIGEST ** outHMAC)"
Asynchronous finish function for TPM2_HMAC
.PP
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\&.
.PP
\fBParameters:\fP
.RS 4
\fIesysContext\fP The \fBESYS_CONTEXT\fP\&. 
.br
\fIoutHMAC\fP The returned HMAC in a sized buffer\&. (callee-allocated) 
.RE
.PP
\fBReturn values:\fP
.RS 4
\fITSS2_RC_SUCCESS\fP on success 
.br
\fIESYS_RC_SUCCESS\fP if the function call was a success\&. 
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\fITSS2_ESYS_RC_BAD_REFERENCE\fP if the esysContext or required input pointers or required output handle references are NULL\&. 
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\fITSS2_ESYS_RC_BAD_CONTEXT\fP if esysContext corruption is detected\&. 
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\fITSS2_ESYS_RC_MEMORY\fP if the ESAPI cannot allocate enough memory for internal operations or return parameters\&. 
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\fITSS2_ESYS_RC_BAD_SEQUENCE\fP if the context has an asynchronous operation already pending\&. 
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\fITSS2_ESYS_RC_TRY_AGAIN\fP if the timeout counter expires before the TPM response is received\&. 
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\fITSS2_ESYS_RC_INSUFFICIENT_RESPONSE\fP if the TPM's response does not at least contain the tag, response length, and response code\&. 
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\fITSS2_ESYS_RC_RSP_AUTH_FAILED\fP if the response HMAC from the TPM did not verify\&. 
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\fITSS2_ESYS_RC_MALFORMED_RESPONSE\fP if the TPM's response is corrupted\&. 
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\fITSS2_RCs\fP produced by lower layers of the software stack may be returned to the caller unaltered unless handled internally\&. 
.RE
.PP

.SH "Author"
.PP 
Generated automatically by Doxygen for tpm2-tss from the source code\&.