137 lines
3.6 KiB
C
137 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __TRUSTED_KEY_H
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#define __TRUSTED_KEY_H
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/* implementation specific TPM constants */
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#define MAX_BUF_SIZE 1024
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#define TPM_GETRANDOM_SIZE 14
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#define TPM_OSAP_SIZE 36
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#define TPM_OIAP_SIZE 10
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#define TPM_SEAL_SIZE 87
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#define TPM_UNSEAL_SIZE 104
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#define TPM_SIZE_OFFSET 2
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#define TPM_RETURN_OFFSET 6
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#define TPM_DATA_OFFSET 10
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#define LOAD32(buffer, offset) (ntohl(*(uint32_t *)&buffer[offset]))
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#define LOAD32N(buffer, offset) (*(uint32_t *)&buffer[offset])
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#define LOAD16(buffer, offset) (ntohs(*(uint16_t *)&buffer[offset]))
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struct tpm_buf {
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int len;
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unsigned char data[MAX_BUF_SIZE];
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};
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#define INIT_BUF(tb) (tb->len = 0)
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struct osapsess {
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uint32_t handle;
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unsigned char secret[SHA1_DIGEST_SIZE];
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unsigned char enonce[TPM_NONCE_SIZE];
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};
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/* discrete values, but have to store in uint16_t for TPM use */
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enum {
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SEAL_keytype = 1,
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SRK_keytype = 4
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};
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int TSS_authhmac(unsigned char *digest, const unsigned char *key,
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unsigned int keylen, unsigned char *h1,
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unsigned char *h2, unsigned char h3, ...);
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int TSS_checkhmac1(unsigned char *buffer,
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const uint32_t command,
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const unsigned char *ononce,
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const unsigned char *key,
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unsigned int keylen, ...);
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int trusted_tpm_send(unsigned char *cmd, size_t buflen);
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int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce);
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#define TPM_DEBUG 0
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#if TPM_DEBUG
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static inline void dump_options(struct trusted_key_options *o)
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{
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pr_info("trusted_key: sealing key type %d\n", o->keytype);
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pr_info("trusted_key: sealing key handle %0X\n", o->keyhandle);
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pr_info("trusted_key: pcrlock %d\n", o->pcrlock);
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pr_info("trusted_key: pcrinfo %d\n", o->pcrinfo_len);
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print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE,
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16, 1, o->pcrinfo, o->pcrinfo_len, 0);
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}
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static inline void dump_payload(struct trusted_key_payload *p)
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{
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pr_info("trusted_key: key_len %d\n", p->key_len);
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print_hex_dump(KERN_INFO, "key ", DUMP_PREFIX_NONE,
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16, 1, p->key, p->key_len, 0);
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pr_info("trusted_key: bloblen %d\n", p->blob_len);
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print_hex_dump(KERN_INFO, "blob ", DUMP_PREFIX_NONE,
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16, 1, p->blob, p->blob_len, 0);
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pr_info("trusted_key: migratable %d\n", p->migratable);
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}
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static inline void dump_sess(struct osapsess *s)
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{
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print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE,
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16, 1, &s->handle, 4, 0);
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pr_info("trusted-key: secret:\n");
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print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
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16, 1, &s->secret, SHA1_DIGEST_SIZE, 0);
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pr_info("trusted-key: enonce:\n");
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print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
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16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0);
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}
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static inline void dump_tpm_buf(unsigned char *buf)
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{
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int len;
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pr_info("\ntrusted-key: tpm buffer\n");
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len = LOAD32(buf, TPM_SIZE_OFFSET);
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print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0);
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}
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#else
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static inline void dump_options(struct trusted_key_options *o)
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{
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}
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static inline void dump_payload(struct trusted_key_payload *p)
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{
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}
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static inline void dump_sess(struct osapsess *s)
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{
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}
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static inline void dump_tpm_buf(unsigned char *buf)
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{
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}
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#endif
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static inline void store8(struct tpm_buf *buf, const unsigned char value)
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{
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buf->data[buf->len++] = value;
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}
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static inline void store16(struct tpm_buf *buf, const uint16_t value)
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{
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*(uint16_t *) & buf->data[buf->len] = htons(value);
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buf->len += sizeof value;
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}
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static inline void store32(struct tpm_buf *buf, const uint32_t value)
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{
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*(uint32_t *) & buf->data[buf->len] = htonl(value);
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buf->len += sizeof value;
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}
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static inline void storebytes(struct tpm_buf *buf, const unsigned char *in,
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const int len)
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{
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memcpy(buf->data + buf->len, in, len);
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buf->len += len;
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}
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#endif
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