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 TPM_SIZE_OFFSET			2
10#define TPM_RETURN_OFFSET		6
11#define TPM_DATA_OFFSET			10
12
13#define LOAD32(buffer, offset)	(ntohl(*(uint32_t *)&buffer[offset]))
14#define LOAD32N(buffer, offset)	(*(uint32_t *)&buffer[offset])
15#define LOAD16(buffer, offset)	(ntohs(*(uint16_t *)&buffer[offset]))
16
17extern struct trusted_key_ops trusted_key_tpm_ops;
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("sealing key type %d\n", o->keytype);
56	pr_info("sealing key handle %0X\n", o->keyhandle);
57	pr_info("pcrlock %d\n", o->pcrlock);
58	pr_info("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_sess(struct osapsess *s)
64{
65	print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE,
66		       16, 1, &s->handle, 4, 0);
67	pr_info("secret:\n");
68	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
69		       16, 1, &s->secret, SHA1_DIGEST_SIZE, 0);
70	pr_info("trusted-key: enonce:\n");
71	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
72		       16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0);
73}
74
75static inline void dump_tpm_buf(unsigned char *buf)
76{
77	int len;
78
79	pr_info("\ntpm buffer\n");
80	len = LOAD32(buf, TPM_SIZE_OFFSET);
81	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0);
82}
83#else
84static inline void dump_options(struct trusted_key_options *o)
85{
86}
87
88static inline void dump_sess(struct osapsess *s)
89{
90}
91
92static inline void dump_tpm_buf(unsigned char *buf)
93{
94}
95#endif
96#endif