1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __TRUSTED_KEY_H
3#define __TRUSTED_KEY_H
4
5/* implementation specific TPM constants */
6#define MAX_BUF_SIZE 1024
7#define TPM_GETRANDOM_SIZE 14
8#define TPM_OSAP_SIZE 36
9#define TPM_OIAP_SIZE 10
10#define TPM_SEAL_SIZE 87
11#define TPM_UNSEAL_SIZE 104
12#define TPM_SIZE_OFFSET 2
13#define TPM_RETURN_OFFSET 6
14#define TPM_DATA_OFFSET 10
15
16#define LOAD32(buffer, offset) (ntohl(*(uint32_t *)&buffer[offset]))
17#define LOAD32N(buffer, offset) (*(uint32_t *)&buffer[offset])
18#define LOAD16(buffer, offset) (ntohs(*(uint16_t *)&buffer[offset]))
19
20struct tpm_buf {
21 int len;
22 unsigned char data[MAX_BUF_SIZE];
23};
24
25#define INIT_BUF(tb) (tb->len = 0)
26
27struct osapsess {
28 uint32_t handle;
29 unsigned char secret[SHA1_DIGEST_SIZE];
30 unsigned char enonce[TPM_NONCE_SIZE];
31};
32
33/* discrete values, but have to store in uint16_t for TPM use */
34enum {
35 SEAL_keytype = 1,
36 SRK_keytype = 4
37};
38
39int TSS_authhmac(unsigned char *digest, const unsigned char *key,
40 unsigned int keylen, unsigned char *h1,
41 unsigned char *h2, unsigned char h3, ...);
42int TSS_checkhmac1(unsigned char *buffer,
43 const uint32_t command,
44 const unsigned char *ononce,
45 const unsigned char *key,
46 unsigned int keylen, ...);
47
48int trusted_tpm_send(unsigned char *cmd, size_t buflen);
49int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce);
50
51#define TPM_DEBUG 0
52
53#if TPM_DEBUG
54static inline void dump_options(struct trusted_key_options *o)
55{
56 pr_info("trusted_key: sealing key type %d\n", o->keytype);
57 pr_info("trusted_key: sealing key handle %0X\n", o->keyhandle);
58 pr_info("trusted_key: pcrlock %d\n", o->pcrlock);
59 pr_info("trusted_key: pcrinfo %d\n", o->pcrinfo_len);
60 print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE,
61 16, 1, o->pcrinfo, o->pcrinfo_len, 0);
62}
63
64static inline void dump_payload(struct trusted_key_payload *p)
65{
66 pr_info("trusted_key: key_len %d\n", p->key_len);
67 print_hex_dump(KERN_INFO, "key ", DUMP_PREFIX_NONE,
68 16, 1, p->key, p->key_len, 0);
69 pr_info("trusted_key: bloblen %d\n", p->blob_len);
70 print_hex_dump(KERN_INFO, "blob ", DUMP_PREFIX_NONE,
71 16, 1, p->blob, p->blob_len, 0);
72 pr_info("trusted_key: migratable %d\n", p->migratable);
73}
74
75static inline void dump_sess(struct osapsess *s)
76{
77 print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE,
78 16, 1, &s->handle, 4, 0);
79 pr_info("trusted-key: secret:\n");
80 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
81 16, 1, &s->secret, SHA1_DIGEST_SIZE, 0);
82 pr_info("trusted-key: enonce:\n");
83 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
84 16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0);
85}
86
87static inline void dump_tpm_buf(unsigned char *buf)
88{
89 int len;
90
91 pr_info("\ntrusted-key: tpm buffer\n");
92 len = LOAD32(buf, TPM_SIZE_OFFSET);
93 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0);
94}
95#else
96static inline void dump_options(struct trusted_key_options *o)
97{
98}
99
100static inline void dump_payload(struct trusted_key_payload *p)
101{
102}
103
104static inline void dump_sess(struct osapsess *s)
105{
106}
107
108static inline void dump_tpm_buf(unsigned char *buf)
109{
110}
111#endif
112
113static inline void store8(struct tpm_buf *buf, const unsigned char value)
114{
115 buf->data[buf->len++] = value;
116}
117
118static inline void store16(struct tpm_buf *buf, const uint16_t value)
119{
120 *(uint16_t *) & buf->data[buf->len] = htons(value);
121 buf->len += sizeof value;
122}
123
124static inline void store32(struct tpm_buf *buf, const uint32_t value)
125{
126 *(uint32_t *) & buf->data[buf->len] = htonl(value);
127 buf->len += sizeof value;
128}
129
130static inline void storebytes(struct tpm_buf *buf, const unsigned char *in,
131 const int len)
132{
133 memcpy(buf->data + buf->len, in, len);
134 buf->len += len;
135}
136#endif
137