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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2018 Bootlin
* Author: Miquel Raynal <miquel.raynal@bootlin.com>
*/
#include <common.h>
#include <dm.h>
#include <tpm-common.h>
#include <tpm-v2.h>
#include "tpm-utils.h"
u32 tpm2_startup(enum tpm2_startup_types mode)
{
const u8 command_v2[12] = {
tpm_u16(TPM2_ST_NO_SESSIONS),
tpm_u32(12),
tpm_u32(TPM2_CC_STARTUP),
tpm_u16(mode),
};
int ret;
/*
* Note TPM2_Startup command will return RC_SUCCESS the first time,
* but will return RC_INITIALIZE otherwise.
*/
ret = tpm_sendrecv_command(command_v2, NULL, NULL);
if (ret && ret != TPM2_RC_INITIALIZE)
return ret;
return 0;
}
u32 tpm2_self_test(enum tpm2_yes_no full_test)
{
const u8 command_v2[12] = {
tpm_u16(TPM2_ST_NO_SESSIONS),
tpm_u32(11),
tpm_u32(TPM2_CC_SELF_TEST),
full_test,
};
return tpm_sendrecv_command(command_v2, NULL, NULL);
}
u32 tpm2_clear(u32 handle, const char *pw, const ssize_t pw_sz)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(27 + pw_sz), /* Length */
tpm_u32(TPM2_CC_CLEAR), /* Command code */
/* HANDLE */
tpm_u32(handle), /* TPM resource handle */
/* AUTH_SESSION */
tpm_u32(9 + pw_sz), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* Session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(pw_sz), /* Size of <hmac/password> */
/* STRING(pw) <hmac/password> (if any) */
};
unsigned int offset = 27;
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the password (if any)
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
offset, pw, pw_sz);
offset += pw_sz;
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(command_v2, NULL, NULL);
}
u32 tpm2_pcr_extend(u32 index, const uint8_t *digest)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(33 + TPM2_DIGEST_LEN), /* Length */
tpm_u32(TPM2_CC_PCR_EXTEND), /* Command code */
/* HANDLE */
tpm_u32(index), /* Handle (PCR Index) */
/* AUTH_SESSION */
tpm_u32(9), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* Session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(0), /* Size of <hmac/password> */
/* <hmac/password> (if any) */
tpm_u32(1), /* Count (number of hashes) */
tpm_u16(TPM2_ALG_SHA256), /* Algorithm of the hash */
/* STRING(digest) Digest */
};
unsigned int offset = 33;
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the digest
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
offset, digest, TPM2_DIGEST_LEN);
offset += TPM2_DIGEST_LEN;
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(command_v2, NULL, NULL);
}
u32 tpm2_pcr_read(u32 idx, unsigned int idx_min_sz, void *data,
unsigned int *updates)
{
u8 idx_array_sz = max(idx_min_sz, DIV_ROUND_UP(idx, 8));
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */
tpm_u32(17 + idx_array_sz), /* Length */
tpm_u32(TPM2_CC_PCR_READ), /* Command code */
/* TPML_PCR_SELECTION */
tpm_u32(1), /* Number of selections */
tpm_u16(TPM2_ALG_SHA256), /* Algorithm of the hash */
idx_array_sz, /* Array size for selection */
/* bitmap(idx) Selected PCR bitmap */
};
size_t response_len = COMMAND_BUFFER_SIZE;
u8 response[COMMAND_BUFFER_SIZE];
unsigned int pcr_sel_idx = idx / 8;
u8 pcr_sel_bit = BIT(idx % 8);
unsigned int counter = 0;
int ret;
if (pack_byte_string(command_v2, COMMAND_BUFFER_SIZE, "b",
17 + pcr_sel_idx, pcr_sel_bit))
return TPM_LIB_ERROR;
ret = tpm_sendrecv_command(command_v2, response, &response_len);
if (ret)
return ret;
if (unpack_byte_string(response, response_len, "ds",
10, &counter,
response_len - TPM2_DIGEST_LEN, data,
TPM2_DIGEST_LEN))
return TPM_LIB_ERROR;
if (updates)
*updates = counter;
return 0;
}
u32 tpm2_get_capability(u32 capability, u32 property, void *buf,
size_t prop_count)
{
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_NO_SESSIONS), /* TAG */
tpm_u32(22), /* Length */
tpm_u32(TPM2_CC_GET_CAPABILITY), /* Command code */
tpm_u32(capability), /* Capability */
tpm_u32(property), /* Property */
tpm_u32(prop_count), /* Property count */
};
u8 response[COMMAND_BUFFER_SIZE];
size_t response_len = COMMAND_BUFFER_SIZE;
unsigned int properties_off;
int ret;
ret = tpm_sendrecv_command(command_v2, response, &response_len);
if (ret)
return ret;
/*
* In the response buffer, the properties are located after the:
* tag (u16), response size (u32), response code (u32),
* YES/NO flag (u8), TPM_CAP (u32) and TPMU_CAPABILITIES (u32).
*/
properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) +
sizeof(u8) + sizeof(u32) + sizeof(u32);
memcpy(buf, &response[properties_off], response_len - properties_off);
return 0;
}
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