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 512
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 #define TPM_DEBUG 0
40
41 #if TPM_DEBUG
dump_options(struct trusted_key_options * o)42 static inline void dump_options(struct trusted_key_options *o)
43 {
44 pr_info("trusted_key: sealing key type %d\n", o->keytype);
45 pr_info("trusted_key: sealing key handle %0X\n", o->keyhandle);
46 pr_info("trusted_key: pcrlock %d\n", o->pcrlock);
47 pr_info("trusted_key: pcrinfo %d\n", o->pcrinfo_len);
48 print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE,
49 16, 1, o->pcrinfo, o->pcrinfo_len, 0);
50 }
51
dump_payload(struct trusted_key_payload * p)52 static inline void dump_payload(struct trusted_key_payload *p)
53 {
54 pr_info("trusted_key: key_len %d\n", p->key_len);
55 print_hex_dump(KERN_INFO, "key ", DUMP_PREFIX_NONE,
56 16, 1, p->key, p->key_len, 0);
57 pr_info("trusted_key: bloblen %d\n", p->blob_len);
58 print_hex_dump(KERN_INFO, "blob ", DUMP_PREFIX_NONE,
59 16, 1, p->blob, p->blob_len, 0);
60 pr_info("trusted_key: migratable %d\n", p->migratable);
61 }
62
dump_sess(struct osapsess * s)63 static 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("trusted-key: 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
dump_tpm_buf(unsigned char * buf)75 static inline void dump_tpm_buf(unsigned char *buf)
76 {
77 int len;
78
79 pr_info("\ntrusted-key: tpm 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
dump_options(struct trusted_key_options * o)84 static inline void dump_options(struct trusted_key_options *o)
85 {
86 }
87
dump_payload(struct trusted_key_payload * p)88 static inline void dump_payload(struct trusted_key_payload *p)
89 {
90 }
91
dump_sess(struct osapsess * s)92 static inline void dump_sess(struct osapsess *s)
93 {
94 }
95
dump_tpm_buf(unsigned char * buf)96 static inline void dump_tpm_buf(unsigned char *buf)
97 {
98 }
99 #endif
100
store8(struct tpm_buf * buf,const unsigned char value)101 static inline void store8(struct tpm_buf *buf, const unsigned char value)
102 {
103 buf->data[buf->len++] = value;
104 }
105
store16(struct tpm_buf * buf,const uint16_t value)106 static inline void store16(struct tpm_buf *buf, const uint16_t value)
107 {
108 *(uint16_t *) & buf->data[buf->len] = htons(value);
109 buf->len += sizeof value;
110 }
111
store32(struct tpm_buf * buf,const uint32_t value)112 static inline void store32(struct tpm_buf *buf, const uint32_t value)
113 {
114 *(uint32_t *) & buf->data[buf->len] = htonl(value);
115 buf->len += sizeof value;
116 }
117
storebytes(struct tpm_buf * buf,const unsigned char * in,const int len)118 static inline void storebytes(struct tpm_buf *buf, const unsigned char *in,
119 const int len)
120 {
121 memcpy(buf->data + buf->len, in, len);
122 buf->len += len;
123 }
124 #endif
125
