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