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
19struct osapsess {
20	uint32_t handle;
21	unsigned char secret[SHA1_DIGEST_SIZE];
22	unsigned char enonce[TPM_NONCE_SIZE];
23};
24
25/* discrete values, but have to store in uint16_t for TPM use */
26enum {
27	SEAL_keytype = 1,
28	SRK_keytype = 4
29};
30
31int TSS_authhmac(unsigned char *digest, const unsigned char *key,
32			unsigned int keylen, unsigned char *h1,
33			unsigned char *h2, unsigned int h3, ...);
34int TSS_checkhmac1(unsigned char *buffer,
35			  const uint32_t command,
36			  const unsigned char *ononce,
37			  const unsigned char *key,
38			  unsigned int keylen, ...);
39
40int trusted_tpm_send(unsigned char *cmd, size_t buflen);
41int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce);
42
43int tpm2_seal_trusted(struct tpm_chip *chip,
44		      struct trusted_key_payload *payload,
45		      struct trusted_key_options *options);
46int tpm2_unseal_trusted(struct tpm_chip *chip,
47			struct trusted_key_payload *payload,
48			struct trusted_key_options *options);
49
50#define TPM_DEBUG 0
51
52#if TPM_DEBUG
53static inline void dump_options(struct trusted_key_options *o)
54{
55	pr_info("trusted_key: sealing key type %d\n", o->keytype);
56	pr_info("trusted_key: sealing key handle %0X\n", o->keyhandle);
57	pr_info("trusted_key: pcrlock %d\n", o->pcrlock);
58	pr_info("trusted_key: pcrinfo %d\n", o->pcrinfo_len);
59	print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE,
60		       16, 1, o->pcrinfo, o->pcrinfo_len, 0);
61}
62
63static inline void dump_payload(struct trusted_key_payload *p)
64{
65	pr_info("trusted_key: key_len %d\n", p->key_len);
66	print_hex_dump(KERN_INFO, "key ", DUMP_PREFIX_NONE,
67		       16, 1, p->key, p->key_len, 0);
68	pr_info("trusted_key: bloblen %d\n", p->blob_len);
69	print_hex_dump(KERN_INFO, "blob ", DUMP_PREFIX_NONE,
70		       16, 1, p->blob, p->blob_len, 0);
71	pr_info("trusted_key: migratable %d\n", p->migratable);
72}
73
74static inline void dump_sess(struct osapsess *s)
75{
76	print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE,
77		       16, 1, &s->handle, 4, 0);
78	pr_info("trusted-key: secret:\n");
79	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
80		       16, 1, &s->secret, SHA1_DIGEST_SIZE, 0);
81	pr_info("trusted-key: enonce:\n");
82	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
83		       16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0);
84}
85
86static inline void dump_tpm_buf(unsigned char *buf)
87{
88	int len;
89
90	pr_info("\ntrusted-key: tpm buffer\n");
91	len = LOAD32(buf, TPM_SIZE_OFFSET);
92	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0);
93}
94#else
95static inline void dump_options(struct trusted_key_options *o)
96{
97}
98
99static inline void dump_payload(struct trusted_key_payload *p)
100{
101}
102
103static inline void dump_sess(struct osapsess *s)
104{
105}
106
107static inline void dump_tpm_buf(unsigned char *buf)
108{
109}
110#endif
111#endif
112