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
19 extern struct trusted_key_ops trusted_key_tpm_ops;
20
21 struct 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 */
28 enum {
29 SEAL_keytype = 1,
30 SRK_keytype = 4
31 };
32
33 int TSS_authhmac(unsigned char *digest, const unsigned char *key,
34 unsigned int keylen, unsigned char *h1,
35 unsigned char *h2, unsigned int h3, ...);
36 int 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
42 int trusted_tpm_send(unsigned char *cmd, size_t buflen);
43 int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce);
44
45 int tpm2_seal_trusted(struct tpm_chip *chip,
46 struct trusted_key_payload *payload,
47 struct trusted_key_options *options);
48 int 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
dump_options(struct trusted_key_options * o)55 static 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
dump_sess(struct osapsess * s)65 static 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
dump_tpm_buf(unsigned char * buf)77 static 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
dump_options(struct trusted_key_options * o)86 static inline void dump_options(struct trusted_key_options *o)
87 {
88 }
89
dump_sess(struct osapsess * s)90 static inline void dump_sess(struct osapsess *s)
91 {
92 }
93
dump_tpm_buf(unsigned char * buf)94 static inline void dump_tpm_buf(unsigned char *buf)
95 {
96 }
97 #endif
98 #endif
99