Copyright (C) 2004 International Business Machines Corporation
Written by Megan Schneider based on the Trusted Computing Group Software Stack Specification Version 1.1 Golden

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1 TCG Software Stack Developer's Reference

Tspi_Hash_VerifySignature - verify the hash value with a given signature

 #include <tss/platform.h>  #include <tss/tcpa_defines.h>  #include <tss/tcpa_typedef.h>  #include <tss/tcpa_struct.h>  #include <tss/tss_typedef.h>  #include <tss/tss_structs.h>  #include <tss/tspi.h>  "TSS_RESULT Tspi_Hash_VerifySignature(TSS_HHASH " hHash ", TSS_HKEY " hKey ","  " UINT32 " ulSignatureLength ", BYTE* " rgbSignature ");" 

Tspi_Hash_VerifySignature verifies the hash value of a given hash object with a given signature. In order to use this command, one must have a hash and a signature of the hash that one is trying to verify. The public key which corresponds to the private key used to sign the hash is also needed.

The handle to the hash object instance whose hash value should be signed. Handle to the key object which should be used for the signature verification. The length of the signature data provided at the parameter rgbSignature. A pointer to the signature data.

Tspi_Hash_VerifySignature returns TSS_SUCCESS on success, otherwise one of the following values is returned:

TSS_E_INVALID_HANDLE hKey is not a valid handle.

TSS_E_INTERNAL_ERROR An internal SW error has been detected.

TSS_E_BAD_PARAMETER One or more parameters is bad.

TSS_E_HASH_INVALID_LENGTH Hash length is inconsistent with hash algorithm.

TSS_E_HASH_NO_DATA Hash object has no internal hash value.

TSS_E_INVALID_SIGSCHEME Invalid signature scheme.

Tspi_Hash_VerifySignature conforms to the Trusted Computing Group Software Specification version 1.1 Golden

Tspi_Hash_UpdateHashValue(3), Tspi_Hash_SetHashValue(3), Tspi_Hash_Sign(3), Tspi_Hash_GetHashValue(3).