/* grub_fatal() on error */
static void
grub_TPM_readpcr( const unsigned long index, grub_uint8_t* result ) {
CHECK_FOR_NULL_ARGUMENT( result )
PassThroughToTPM_InputParamBlock *passThroughInput = NULL;
PCRReadIncoming* pcrReadIncoming = NULL;
grub_uint16_t inputlen = sizeof( *passThroughInput ) - sizeof( passThroughInput->TPMOperandIn ) + sizeof( *pcrReadIncoming );
PassThroughToTPM_OutputParamBlock *passThroughOutput = NULL;
PCRReadOutgoing* pcrReadOutgoing = NULL;
grub_uint16_t outputlen = sizeof( *passThroughOutput ) - sizeof( passThroughOutput->TPMOperandOut ) + sizeof( *pcrReadOutgoing );
passThroughInput = grub_zalloc( inputlen );
if( ! passThroughInput ) {
grub_fatal( "readpcr: memory allocation failed" );
}
passThroughInput->IPBLength = inputlen;
passThroughInput->OPBLength = outputlen;
pcrReadIncoming = (void *)passThroughInput->TPMOperandIn;
pcrReadIncoming->tag = grub_swap_bytes16_compile_time( TPM_TAG_RQU_COMMAND );
pcrReadIncoming->paramSize = grub_swap_bytes32( sizeof( *pcrReadIncoming ) );
pcrReadIncoming->ordinal = grub_swap_bytes32_compile_time( TPM_ORD_PcrRead );
pcrReadIncoming->pcrIndex = grub_swap_bytes32( (grub_uint32_t) index);
passThroughOutput = grub_zalloc( outputlen );
if( ! passThroughOutput ) {
grub_free( passThroughInput );
grub_fatal( "readpcr: memory allocation failed" );
}
grub_TPM_int1A_passThroughToTPM( passThroughInput, passThroughOutput );
grub_free( passThroughInput );
pcrReadOutgoing = (void *)passThroughOutput->TPMOperandOut;
grub_uint32_t tpm_PCRreadReturnCode = grub_swap_bytes32( pcrReadOutgoing->returnCode );
if( tpm_PCRreadReturnCode != TPM_SUCCESS ) {
grub_free( passThroughOutput );
if( tpm_PCRreadReturnCode == TPM_BADINDEX ) {
grub_fatal( "readpcr: bad pcr index" );
}
grub_fatal( "readpcr: tpm_PCRreadReturnCode: %u", tpm_PCRreadReturnCode );
}
grub_memcpy( result, pcrReadOutgoing->pcr_value, SHA1_DIGEST_SIZE );
grub_free( passThroughOutput );
}
static void
test32 (grub_uint32_t a)
{
grub_uint32_t b, c;
grub_uint8_t *ap, *bp;
int i;
b = grub_swap_bytes32 (a);
c = grub_swap_bytes32 (b);
grub_test_assert (a == c, "bswap not idempotent: 0x%llx, 0x%llx, 0x%llx",
(long long) a, (long long) b, (long long) c);
ap = (grub_uint8_t *) &a;
bp = (grub_uint8_t *) &b;
for (i = 0; i < 4; i++)
{
grub_test_assert (ap[i] == bp[3 - i],
"bswap bytes wrong: 0x%llx, 0x%llx",
(long long) a, (long long) b);
}
}
static void
grub_gpt_lecrc32 (grub_uint32_t *crc, const void *data, grub_size_t len)
{
grub_uint32_t crc32_val;
grub_crypto_hash (GRUB_MD_CRC32, &crc32_val, data, len);
/* GRUB_MD_CRC32 always uses big endian, gpt is always little. */
*crc = grub_swap_bytes32 (crc32_val);
}
