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//**********************************************************************;
// Copyright (c) 2017, Intel Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of Intel Corporation nor the names of its contributors
// may be used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//**********************************************************************;
#include <errno.h>
#include <string.h>
#include <sapi/tpm20.h>
#include "log.h"
#include "files.h"
#include "tpm2_hash.h"
#include "tpm2_util.h"
bool tpm2_hash_compute_data(TSS2_SYS_CONTEXT *sapi_context, TPMI_ALG_HASH halg,
TPMI_RH_HIERARCHY hierarchy, BYTE *buffer, UINT16 length,
TPM2B_DIGEST *result, TPMT_TK_HASHCHECK *validation) {
FILE *mem = fmemopen(buffer, length, "rb");
if (!mem) {
LOG_ERR("Error converting buffer to memory stream: %s",
strerror(errno));
return false;
}
return tpm2_hash_file(sapi_context, halg, hierarchy, mem, result, validation);
}
bool tpm2_hash_file(TSS2_SYS_CONTEXT *sapi_context, TPMI_ALG_HASH halg,
TPMI_RH_HIERARCHY hierarchy, FILE *input, TPM2B_DIGEST *result,
TPMT_TK_HASHCHECK *validation) {
TPM2B_AUTH nullAuth = TPM2B_EMPTY_INIT;
TPMI_DH_OBJECT sequenceHandle;
TSS2L_SYS_AUTH_COMMAND cmdAuthArray = { 1, {{.sessionHandle = TPM2_RS_PW,
.nonce = TPM2B_EMPTY_INIT, .hmac = TPM2B_EMPTY_INIT,
.sessionAttributes = 0, }}};
unsigned long file_size = 0;
/* Suppress error reporting with NULL path */
bool res = files_get_file_size(input, &file_size, NULL);
/* If we can get the file size and its less than 1024, just do it in one hash invocation */
if (res && file_size <= TPM2_MAX_DIGEST_BUFFER) {
TPM2B_MAX_BUFFER buffer = { .size = file_size };
res = files_read_bytes(input, buffer.buffer, buffer.size);
if (!res) {
LOG_ERR("Error reading input file!");
return false;
}
TSS2_RC rval = TSS2_RETRY_EXP(Tss2_Sys_Hash(sapi_context, NULL, &buffer, halg,
hierarchy, result, validation, NULL));
if (rval != TSS2_RC_SUCCESS) {
LOG_PERR(Tss2_Sys_Hash, rval);
return false;
}
return true;
}
/*
* Size is either unkown because the FILE * is a fifo, or it's too big
* to do in a single hash call. Based on the size figure out the chunks
* to loop over, if possible. This way we can call Complete with data.
*/
TSS2_RC rval = TSS2_RETRY_EXP(Tss2_Sys_HashSequenceStart(sapi_context, NULL, &nullAuth,
halg, &sequenceHandle, NULL));
if (rval != TPM2_RC_SUCCESS) {
LOG_PERR(Tss2_Sys_HashSequenceStart, rval);
return rval;
}
/* If we know the file size, we decrement the amount read and terminate the loop
* when 1 block is left, else we go till feof.
*/
size_t left = file_size;
bool use_left = !!res;
TPM2B_MAX_BUFFER data;
bool done = false;
while (!done) {
size_t bytes_read = fread(data.buffer, 1,
BUFFER_SIZE(typeof(data), buffer), input);
if (ferror(input)) {
LOG_ERR("Error reading from input file");
return false;
}
data.size = bytes_read;
/* if data was read, update the sequence */
rval = TSS2_RETRY_EXP(Tss2_Sys_SequenceUpdate(sapi_context, sequenceHandle,
&cmdAuthArray, &data, NULL));
if (rval != TPM2_RC_SUCCESS) {
LOG_PERR(Tss2_Sys_SequenceUpdate, rval);
return false;
}
if (use_left) {
left -= bytes_read;
if (left <= TPM2_MAX_DIGEST_BUFFER) {
done = true;
continue;
}
} else if (feof(input)) {
done = true;
}
} /* end file read/hash update loop */
if (use_left) {
data.size = left;
bool res = files_read_bytes(input, data.buffer, left);
if (!res) {
LOG_ERR("Error reading from input file.");
return false;
}
} else {
data.size = 0;
}
rval = TSS2_RETRY_EXP(Tss2_Sys_SequenceComplete(sapi_context, sequenceHandle,
&cmdAuthArray, &data, hierarchy, result, validation,
NULL));
if (rval != TSS2_RC_SUCCESS) {
LOG_PERR(Tss2_Sys_SequenceComplete, rval);
return false;
}
return true;
}
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