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 int 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