1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2004 IBM Corporation
4 * Copyright (C) 2014 Intel Corporation
7 #include <linux/string.h>
10 #include <linux/tpm_command.h>
12 #include <keys/trusted-type.h>
13 #include <keys/trusted_tpm.h>
15 static struct tpm2_hash tpm2_hash_map[] = {
16 {HASH_ALGO_SHA1, TPM_ALG_SHA1},
17 {HASH_ALGO_SHA256, TPM_ALG_SHA256},
18 {HASH_ALGO_SHA384, TPM_ALG_SHA384},
19 {HASH_ALGO_SHA512, TPM_ALG_SHA512},
20 {HASH_ALGO_SM3_256, TPM_ALG_SM3_256},
24 * tpm_buf_append_auth() - append TPMS_AUTH_COMMAND to the buffer.
26 * @buf: an allocated tpm_buf instance
27 * @session_handle: session handle
28 * @nonce: the session nonce, may be NULL if not used
29 * @nonce_len: the session nonce length, may be 0 if not used
30 * @attributes: the session attributes
31 * @hmac: the session HMAC or password, may be NULL if not used
32 * @hmac_len: the session HMAC or password length, maybe 0 if not used
34 static void tpm2_buf_append_auth(struct tpm_buf *buf, u32 session_handle,
35 const u8 *nonce, u16 nonce_len,
37 const u8 *hmac, u16 hmac_len)
39 tpm_buf_append_u32(buf, 9 + nonce_len + hmac_len);
40 tpm_buf_append_u32(buf, session_handle);
41 tpm_buf_append_u16(buf, nonce_len);
43 if (nonce && nonce_len)
44 tpm_buf_append(buf, nonce, nonce_len);
46 tpm_buf_append_u8(buf, attributes);
47 tpm_buf_append_u16(buf, hmac_len);
50 tpm_buf_append(buf, hmac, hmac_len);
54 * tpm2_seal_trusted() - seal the payload of a trusted key
56 * @chip: TPM chip to use
57 * @payload: the key data in clear and encrypted form
58 * @options: authentication values and other options
60 * Return: < 0 on error and 0 on success.
62 int tpm2_seal_trusted(struct tpm_chip *chip,
63 struct trusted_key_payload *payload,
64 struct trusted_key_options *options)
66 unsigned int blob_len;
72 for (i = 0; i < ARRAY_SIZE(tpm2_hash_map); i++) {
73 if (options->hash == tpm2_hash_map[i].crypto_id) {
74 hash = tpm2_hash_map[i].tpm_id;
79 if (i == ARRAY_SIZE(tpm2_hash_map))
82 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_CREATE);
86 tpm_buf_append_u32(&buf, options->keyhandle);
87 tpm2_buf_append_auth(&buf, TPM2_RS_PW,
89 0 /* session_attributes */,
90 options->keyauth /* hmac */,
94 tpm_buf_append_u16(&buf, 4 + TPM_DIGEST_SIZE + payload->key_len + 1);
96 tpm_buf_append_u16(&buf, TPM_DIGEST_SIZE);
97 tpm_buf_append(&buf, options->blobauth, TPM_DIGEST_SIZE);
98 tpm_buf_append_u16(&buf, payload->key_len + 1);
99 tpm_buf_append(&buf, payload->key, payload->key_len);
100 tpm_buf_append_u8(&buf, payload->migratable);
103 tpm_buf_append_u16(&buf, 14 + options->policydigest_len);
104 tpm_buf_append_u16(&buf, TPM_ALG_KEYEDHASH);
105 tpm_buf_append_u16(&buf, hash);
108 if (options->policydigest_len) {
109 tpm_buf_append_u32(&buf, 0);
110 tpm_buf_append_u16(&buf, options->policydigest_len);
111 tpm_buf_append(&buf, options->policydigest,
112 options->policydigest_len);
114 tpm_buf_append_u32(&buf, TPM2_OA_USER_WITH_AUTH);
115 tpm_buf_append_u16(&buf, 0);
118 /* public parameters */
119 tpm_buf_append_u16(&buf, TPM_ALG_NULL);
120 tpm_buf_append_u16(&buf, 0);
123 tpm_buf_append_u16(&buf, 0);
126 tpm_buf_append_u32(&buf, 0);
128 if (buf.flags & TPM_BUF_OVERFLOW) {
133 rc = tpm_send(chip, buf.data, tpm_buf_length(&buf));
137 blob_len = be32_to_cpup((__be32 *) &buf.data[TPM_HEADER_SIZE]);
138 if (blob_len > MAX_BLOB_SIZE) {
142 if (tpm_buf_length(&buf) < TPM_HEADER_SIZE + 4 + blob_len) {
147 memcpy(payload->blob, &buf.data[TPM_HEADER_SIZE + 4], blob_len);
148 payload->blob_len = blob_len;
151 tpm_buf_destroy(&buf);
154 if (tpm2_rc_value(rc) == TPM2_RC_HASH)
164 * tpm2_load_cmd() - execute a TPM2_Load command
166 * @chip: TPM chip to use
167 * @payload: the key data in clear and encrypted form
168 * @options: authentication values and other options
169 * @blob_handle: returned blob handle
171 * Return: 0 on success.
172 * -E2BIG on wrong payload size.
173 * -EPERM on tpm error status.
174 * < 0 error from tpm_send.
176 static int tpm2_load_cmd(struct tpm_chip *chip,
177 struct trusted_key_payload *payload,
178 struct trusted_key_options *options,
182 unsigned int private_len;
183 unsigned int public_len;
184 unsigned int blob_len;
187 private_len = be16_to_cpup((__be16 *) &payload->blob[0]);
188 if (private_len > (payload->blob_len - 2))
191 public_len = be16_to_cpup((__be16 *) &payload->blob[2 + private_len]);
192 blob_len = private_len + public_len + 4;
193 if (blob_len > payload->blob_len)
196 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_LOAD);
200 tpm_buf_append_u32(&buf, options->keyhandle);
201 tpm2_buf_append_auth(&buf, TPM2_RS_PW,
203 0 /* session_attributes */,
204 options->keyauth /* hmac */,
207 tpm_buf_append(&buf, payload->blob, blob_len);
209 if (buf.flags & TPM_BUF_OVERFLOW) {
214 rc = tpm_send(chip, buf.data, tpm_buf_length(&buf));
216 *blob_handle = be32_to_cpup(
217 (__be32 *) &buf.data[TPM_HEADER_SIZE]);
220 tpm_buf_destroy(&buf);
229 * tpm2_unseal_cmd() - execute a TPM2_Unload command
231 * @chip: TPM chip to use
232 * @payload: the key data in clear and encrypted form
233 * @options: authentication values and other options
234 * @blob_handle: blob handle
236 * Return: 0 on success
237 * -EPERM on tpm error status
238 * < 0 error from tpm_send
240 static int tpm2_unseal_cmd(struct tpm_chip *chip,
241 struct trusted_key_payload *payload,
242 struct trusted_key_options *options,
250 rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_UNSEAL);
254 tpm_buf_append_u32(&buf, blob_handle);
255 tpm2_buf_append_auth(&buf,
256 options->policyhandle ?
257 options->policyhandle : TPM2_RS_PW,
259 TPM2_SA_CONTINUE_SESSION,
260 options->blobauth /* hmac */,
263 rc = tpm_send(chip, buf.data, tpm_buf_length(&buf));
268 data_len = be16_to_cpup(
269 (__be16 *) &buf.data[TPM_HEADER_SIZE + 4]);
270 if (data_len < MIN_KEY_SIZE || data_len > MAX_KEY_SIZE + 1) {
275 if (tpm_buf_length(&buf) < TPM_HEADER_SIZE + 6 + data_len) {
279 data = &buf.data[TPM_HEADER_SIZE + 6];
281 memcpy(payload->key, data, data_len - 1);
282 payload->key_len = data_len - 1;
283 payload->migratable = data[data_len - 1];
287 tpm_buf_destroy(&buf);
292 * tpm2_unseal_trusted() - unseal the payload of a trusted key
294 * @chip: TPM chip to use
295 * @payload: the key data in clear and encrypted form
296 * @options: authentication values and other options
298 * Return: Same as with tpm_send.
300 int tpm2_unseal_trusted(struct tpm_chip *chip,
301 struct trusted_key_payload *payload,
302 struct trusted_key_options *options)
307 rc = tpm2_load_cmd(chip, payload, options, &blob_handle);
311 rc = tpm2_unseal_cmd(chip, payload, options, blob_handle);
312 tpm2_flush_context(chip, blob_handle);