Assigning a hash to another hash key Post: 302397097

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tspi_hash_verifysignature

Tspi_Hash_VerifySignature(3)				     Library Functions Manual				      Tspi_Hash_VerifySignature(3)

						     TCG Software Stack Developer's Reference

NAME

       Tspi_Hash_VerifySignature - verify the hash value with a given signature

SYNOPSIS

       #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);

DESCRIPTION

       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.

PARAMETERS

   hHash
       The handle to the hash object instance whose hash value should be signed.

   hKey
       Handle to the key object which should be used for the signature verification.

   ulSignatureLength
       The length of the signature data provided at the parameter rgbSignature.

   rgbSignature
       A pointer to the signature data.

RETURN CODES

       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.

CONFORMING TO

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

SEE ALSO

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

TSS 1.1 							    2004-05-25					      Tspi_Hash_VerifySignature(3)