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
20 struct tpm_buf {
21 int len;
22 unsigned char data[MAX_BUF_SIZE];
23 };
24
25 #define INIT_BUF(tb) (tb->len = 0)
26
27 struct 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 */
34 enum {
35 SEAL_keytype = 1,
36 SRK_keytype = 4
37 };
38
39 int TSS_authhmac(unsigned char *digest, const unsigned char *key,
40 unsigned int keylen, unsigned char *h1,
41 unsigned char *h2, unsigned int h3, ...);
42 int 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
48 int trusted_tpm_send(unsigned char *cmd, size_t buflen);
49 int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce);
50
51 #define TPM_DEBUG 0
52
53 #if TPM_DEBUG
dump_options(struct trusted_key_options * o)54 static 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
dump_payload(struct trusted_key_payload * p)64 static 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
dump_sess(struct osapsess * s)75 static 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
dump_tpm_buf(unsigned char * buf)87 static 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
dump_options(struct trusted_key_options * o)96 static inline void dump_options(struct trusted_key_options *o)
97 {
98 }
99
dump_payload(struct trusted_key_payload * p)100 static inline void dump_payload(struct trusted_key_payload *p)
101 {
102 }
103
dump_sess(struct osapsess * s)104 static inline void dump_sess(struct osapsess *s)
105 {
106 }
107
dump_tpm_buf(unsigned char * buf)108 static inline void dump_tpm_buf(unsigned char *buf)
109 {
110 }
111 #endif
112
store8(struct tpm_buf * buf,const unsigned char value)113 static inline void store8(struct tpm_buf *buf, const unsigned char value)
114 {
115 buf->data[buf->len++] = value;
116 }
117
store16(struct tpm_buf * buf,const uint16_t value)118 static 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
store32(struct tpm_buf * buf,const uint32_t value)124 static 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
storebytes(struct tpm_buf * buf,const unsigned char * in,const int len)130 static 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