include/keys/trusted_tpm.h

   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
  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
  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
  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
  86 static inline void dump_options(struct trusted_key_options *o)
  87 {
  88 }
  89
  90 static inline void dump_sess(struct osapsess *s)
  91 {
  92 }
  93
  94 static inline void dump_tpm_buf(unsigned char *buf)
  95 {
  96 }
  97 #endif
  98 #endif