tablet/grub
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

tss2: Add TPM2 buffer handling functions

Browse Source 
As the preparation to support TPM2 Software Stack (TSS2), this commit
implements the TPM2 buffer handling functions to pack data for the TPM2
commands and unpack the data from the response.

Cc: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Hernan Gatta <hegatta@linux.microsoft.com>
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
This commit is contained in:
Gary Lin 2024-11-15 15:34:48 +08:00 committed by Daniel Kiper
parent 5d260302da
commit 2ad159d9b3
2 changed files with 211 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

147
grub-core/lib/tss2/buffer.c Normal file
View File

@ -0,0 +1,147 @@
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2022 Microsoft Corporation
* Copyright (C) 2024 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/misc.h>
#include <tss2_buffer.h>
void grub_tpm2_buffer_init (grub_tpm2_buffer_t buffer)
{
grub_memset (buffer->data, 0, sizeof (buffer->data));
buffer->size = 0;
buffer->offset = 0;
buffer->cap = sizeof (buffer->data);
buffer->error = 0;
}
void
grub_tpm2_buffer_pack (grub_tpm2_buffer_t buffer, const void *data, grub_size_t size)
{
grub_uint32_t r = buffer->cap - buffer->size;
if (buffer->error)
return;
if (size > r)
{
buffer->error = 1;
return;
}
grub_memcpy (&buffer->data[buffer->size], (void *) data, size);
buffer->size += size;
}
void
grub_tpm2_buffer_pack_u8 (grub_tpm2_buffer_t buffer, grub_uint8_t value)
{
grub_tpm2_buffer_pack (buffer, (const void *) &value, sizeof (value));
}
void
grub_tpm2_buffer_pack_u16 (grub_tpm2_buffer_t buffer, grub_uint16_t value)
{
grub_uint16_t tmp = grub_cpu_to_be16 (value);
grub_tpm2_buffer_pack (buffer, (const void *) &tmp, sizeof (tmp));
}
void
grub_tpm2_buffer_pack_u32 (grub_tpm2_buffer_t buffer, grub_uint32_t value)
{
grub_uint32_t tmp = grub_cpu_to_be32 (value);
grub_tpm2_buffer_pack (buffer, (const void *) &tmp, sizeof (tmp));
}
void
grub_tpm2_buffer_unpack (grub_tpm2_buffer_t buffer, void *data, grub_size_t size)
{
grub_uint32_t r = buffer->size - buffer->offset;
if (buffer->error)
return;
if (size > r)
{
buffer->error = 1;
return;
}
grub_memcpy (data, &buffer->data[buffer->offset], size);
buffer->offset += size;
}
void
grub_tpm2_buffer_unpack_u8 (grub_tpm2_buffer_t buffer, grub_uint8_t *value)
{
grub_uint32_t r = buffer->size - buffer->offset;
if (buffer->error)
return;
if (sizeof (*value) > r)
{
buffer->error = 1;
return;
}
grub_memcpy (value, &buffer->data[buffer->offset], sizeof (*value));
buffer->offset += sizeof (*value);
}
void
grub_tpm2_buffer_unpack_u16 (grub_tpm2_buffer_t buffer, grub_uint16_t *value)
{
grub_uint16_t tmp;
grub_uint32_t r = buffer->size - buffer->offset;
if (buffer->error)
return;
if (sizeof (tmp) > r)
{
buffer->error = 1;
return;
}
grub_memcpy (&tmp, &buffer->data[buffer->offset], sizeof (tmp));
buffer->offset += sizeof (tmp);
*value = grub_be_to_cpu16 (tmp);
}
void
grub_tpm2_buffer_unpack_u32 (grub_tpm2_buffer_t buffer, grub_uint32_t *value)
{
grub_uint32_t tmp;
grub_uint32_t r = buffer->size - buffer->offset;
if (buffer->error)
return;
if (sizeof (tmp) > r)
{
buffer->error = 1;
return;
}
grub_memcpy (&tmp, &buffer->data[buffer->offset], sizeof (tmp));
buffer->offset += sizeof (tmp);
*value = grub_be_to_cpu32 (tmp);
}

64
grub-core/lib/tss2/tss2_buffer.h Normal file
View File

@ -0,0 +1,64 @@
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2022 Microsoft Corporation
* Copyright (C) 2024 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GRUB_TPM2_BUFFER_HEADER
#define GRUB_TPM2_BUFFER_HEADER 1
#include <grub/types.h>
#define GRUB_TPM2_BUFFER_CAPACITY 4096
struct grub_tpm2_buffer
{
grub_uint8_t data[GRUB_TPM2_BUFFER_CAPACITY];
grub_size_t size;
grub_size_t offset;
grub_size_t cap;
bool error;
};
typedef struct grub_tpm2_buffer *grub_tpm2_buffer_t;
extern void
grub_tpm2_buffer_init (grub_tpm2_buffer_t buffer);
extern void
grub_tpm2_buffer_pack (grub_tpm2_buffer_t buffer, const void *data, grub_size_t size);
extern void
grub_tpm2_buffer_pack_u8 (grub_tpm2_buffer_t buffer, grub_uint8_t value);
extern void
grub_tpm2_buffer_pack_u16 (grub_tpm2_buffer_t buffer, grub_uint16_t value);
extern void
grub_tpm2_buffer_pack_u32 (grub_tpm2_buffer_t buffer, grub_uint32_t value);
extern void
grub_tpm2_buffer_unpack (grub_tpm2_buffer_t buffer, void *data, grub_size_t size);
extern void
grub_tpm2_buffer_unpack_u8 (grub_tpm2_buffer_t buffer, grub_uint8_t *value);
extern void
grub_tpm2_buffer_unpack_u16 (grub_tpm2_buffer_t buffer, grub_uint16_t *value);
extern void
grub_tpm2_buffer_unpack_u32 (grub_tpm2_buffer_t buffer, grub_uint32_t *value);
#endif /* ! GRUB_TPM2_BUFFER_HEADER */