1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __TRUSTED_TPM_H
3#define __TRUSTED_TPM_H
4
5#include <keys/trusted-type.h>
6#include <linux/tpm_command.h>
7
8/* implementation specific TPM constants */
9#define MAX_BUF_SIZE			1024
10#define TPM_GETRANDOM_SIZE		14
11#define TPM_SIZE_OFFSET			2
12#define TPM_RETURN_OFFSET		6
13#define TPM_DATA_OFFSET			10
14
15#define LOAD32(buffer, offset)	(ntohl(*(uint32_t *)&buffer[offset]))
16#define LOAD32N(buffer, offset)	(*(uint32_t *)&buffer[offset])
17#define LOAD16(buffer, offset)	(ntohs(*(uint16_t *)&buffer[offset]))
18
19extern struct trusted_key_ops trusted_key_tpm_ops;
20
21struct osapsess {
22	uint32_t handle;
23	unsigned char secret[SHA1_DIGEST_SIZE];
24	unsigned char enonce[TPM_NONCE_SIZE];
25};
26
27/* discrete values, but have to store in uint16_t for TPM use */
28enum {
29	SEAL_keytype = 1,
30	SRK_keytype = 4
31};
32
33int TSS_authhmac(unsigned char *digest, const unsigned char *key,
34			unsigned int keylen, unsigned char *h1,
35			unsigned char *h2, unsigned int h3, ...);
36int TSS_checkhmac1(unsigned char *buffer,
37			  const uint32_t command,
38			  const unsigned char *ononce,
39			  const unsigned char *key,
40			  unsigned int keylen, ...);
41
42int trusted_tpm_send(unsigned char *cmd, size_t buflen);
43int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce);
44
45int tpm2_seal_trusted(struct tpm_chip *chip,
46		      struct trusted_key_payload *payload,
47		      struct trusted_key_options *options);
48int tpm2_unseal_trusted(struct tpm_chip *chip,
49			struct trusted_key_payload *payload,
50			struct trusted_key_options *options);
51
52#define TPM_DEBUG 0
53
54#if TPM_DEBUG
55static inline void dump_options(struct trusted_key_options *o)
56{
57	pr_info("sealing key type %d\n", o->keytype);
58	pr_info("sealing key handle %0X\n", o->keyhandle);
59	pr_info("pcrlock %d\n", o->pcrlock);
60	pr_info("pcrinfo %d\n", o->pcrinfo_len);
61	print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE,
62		       16, 1, o->pcrinfo, o->pcrinfo_len, 0);
63}
64
65static inline void dump_sess(struct osapsess *s)
66{
67	print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE,
68		       16, 1, &s->handle, 4, 0);
69	pr_info("secret:\n");
70	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
71		       16, 1, &s->secret, SHA1_DIGEST_SIZE, 0);
72	pr_info("trusted-key: enonce:\n");
73	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
74		       16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0);
75}
76
77static inline void dump_tpm_buf(unsigned char *buf)
78{
79	int len;
80
81	pr_info("\ntpm buffer\n");
82	len = LOAD32(buf, TPM_SIZE_OFFSET);
83	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0);
84}
85#else
86static inline void dump_options(struct trusted_key_options *o)
87{
88}
89
90static inline void dump_sess(struct osapsess *s)
91{
92}
93
94static inline void dump_tpm_buf(unsigned char *buf)
95{
96}
97#endif
98#endif
99