.TH "Esys_VerifySignature" 3 "Sun May 7 2023" "Version 4.0.1" "tpm2-tss" \" -*- nroff -*-
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.SH NAME
Esys_VerifySignature \- The ESAPI function for the TPM2_VerifySignature command\&.
.SH SYNOPSIS
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.PP
.SS "Functions"

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.RI "TSS2_RC \fBEsys_VerifySignature_Async\fP (\fBESYS_CONTEXT\fP *esysContext, \fBESYS_TR\fP keyHandle, \fBESYS_TR\fP shandle1, \fBESYS_TR\fP shandle2, \fBESYS_TR\fP shandle3, const TPM2B_DIGEST *digest, const TPMT_SIGNATURE *signature)"
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.RI "TSS2_RC \fBEsys_VerifySignature\fP (\fBESYS_CONTEXT\fP *esysContext, \fBESYS_TR\fP keyHandle, \fBESYS_TR\fP shandle1, \fBESYS_TR\fP shandle2, \fBESYS_TR\fP shandle3, const TPM2B_DIGEST *digest, const TPMT_SIGNATURE *signature, TPMT_TK_VERIFIED **validation)"
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.RI "TSS2_RC \fBEsys_VerifySignature_Finish\fP (\fBESYS_CONTEXT\fP *esysContext, TPMT_TK_VERIFIED **validation)"
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.SH "Detailed Description"
.PP 
ESAPI function to invoke the TPM2_VerifySignature command either as a one-call or in an asynchronous manner\&. 
.SH "Function Documentation"
.PP 
.SS "TSS2_RC Esys_VerifySignature (\fBESYS_CONTEXT\fP * esysContext, \fBESYS_TR\fP keyHandle, \fBESYS_TR\fP shandle1, \fBESYS_TR\fP shandle2, \fBESYS_TR\fP shandle3, const TPM2B_DIGEST * digest, const TPMT_SIGNATURE * signature, TPMT_TK_VERIFIED ** validation)"
One-Call function for TPM2_VerifySignature
.PP
This function invokes the TPM2_VerifySignature 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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\fIkeyHandle\fP Handle of public key that will be used in the validation\&. 
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\fIshandle1\fP First session handle\&. 
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\fIshandle2\fP Second session handle\&. 
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\fIshandle3\fP Third session handle\&. 
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\fIdigest\fP Digest of the signed message\&. 
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\fIsignature\fP Signature to be tested\&. 
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\fIvalidation\fP \&. (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_ESYS_RC_NO_ENCRYPT_PARAM\fP if one of the sessions has the 'encrypt' attribute set and the command does not support encryption of the first response parameter\&. 
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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_VerifySignature_Async (\fBESYS_CONTEXT\fP * esysContext, \fBESYS_TR\fP keyHandle, \fBESYS_TR\fP shandle1, \fBESYS_TR\fP shandle2, \fBESYS_TR\fP shandle3, const TPM2B_DIGEST * digest, const TPMT_SIGNATURE * signature)"
Asynchronous function for TPM2_VerifySignature
.PP
This function invokes the TPM2_VerifySignature 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_VerifySignature_Finish\&.
.PP
\fBParameters\fP
.RS 4
\fIesysContext\fP The \fBESYS_CONTEXT\fP\&. 
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\fIkeyHandle\fP Handle of public key that will be used in the validation\&. 
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\fIshandle1\fP First session handle\&. 
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\fIshandle2\fP Second session handle\&. 
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\fIshandle3\fP Third session handle\&. 
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\fIdigest\fP Digest of the signed message\&. 
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\fIsignature\fP Signature to be tested\&. 
.RE
.PP
\fBReturn values\fP
.RS 4
\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_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\&. 
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\fITSS2_ESYS_RC_NO_ENCRYPT_PARAM\fP if one of the sessions has the 'encrypt' attribute set and the command does not support encryption of the first response parameter\&. 
.RE
.PP

.SS "TSS2_RC Esys_VerifySignature_Finish (\fBESYS_CONTEXT\fP * esysContext, TPMT_TK_VERIFIED ** validation)"
Asynchronous finish function for TPM2_VerifySignature
.PP
This function returns the results of a TPM2_VerifySignature command invoked via Esys_VerifySignature_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\&. 
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\fIvalidation\fP \&. (callee-allocated) 
.RE
.PP
\fBReturn values\fP
.RS 4
\fITSS2_RC_SUCCESS\fP on success 
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\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\&.