KEYS: trusted: Create trusted keys subsystem

Move existing code to trusted keys subsystem. Also, rename files with
"tpm" as suffix which provides the underlying implementation.

Suggested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

1 files changed, 0 insertions, 1275 deletions

diff --git a/security/keys/trusted.c b/security/keys/trusted.c
deleted file mode 100644
index 707101170aec..000000000000
--- a/security/keys/trusted.c
+++ /dev/null
@@ -1,1275 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2010 IBM Corporation
- *
- * Author:
- * David Safford <safford@us.ibm.com>
- *
- * See Documentation/security/keys/trusted-encrypted.rst
- */
-
-#include <crypto/hash_info.h>
-#include <linux/uaccess.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/parser.h>
-#include <linux/string.h>
-#include <linux/err.h>
-#include <keys/user-type.h>
-#include <keys/trusted-type.h>
-#include <linux/key-type.h>
-#include <linux/rcupdate.h>
-#include <linux/crypto.h>
-#include <crypto/hash.h>
-#include <crypto/sha.h>
-#include <linux/capability.h>
-#include <linux/tpm.h>
-#include <linux/tpm_command.h>
-
-#include <keys/trusted.h>
-
-static const char hmac_alg[] = "hmac(sha1)";
-static const char hash_alg[] = "sha1";
-static struct tpm_chip *chip;
-static struct tpm_digest *digests;
-
-struct sdesc {
-	struct shash_desc shash;
-	char ctx[];
-};
-
-static struct crypto_shash *hashalg;
-static struct crypto_shash *hmacalg;
-
-static struct sdesc *init_sdesc(struct crypto_shash *alg)
-{
-	struct sdesc *sdesc;
-	int size;
-
-	size = sizeof(struct shash_desc) + crypto_shash_descsize(alg);
-	sdesc = kmalloc(size, GFP_KERNEL);
-	if (!sdesc)
-		return ERR_PTR(-ENOMEM);
-	sdesc->shash.tfm = alg;
-	return sdesc;
-}
-
-static int TSS_sha1(const unsigned char *data, unsigned int datalen,
-		    unsigned char *digest)
-{
-	struct sdesc *sdesc;
-	int ret;
-
-	sdesc = init_sdesc(hashalg);
-	if (IS_ERR(sdesc)) {
-		pr_info("trusted_key: can't alloc %s\n", hash_alg);
-		return PTR_ERR(sdesc);
-	}
-
-	ret = crypto_shash_digest(&sdesc->shash, data, datalen, digest);
-	kzfree(sdesc);
-	return ret;
-}
-
-static int TSS_rawhmac(unsigned char *digest, const unsigned char *key,
-		       unsigned int keylen, ...)
-{
-	struct sdesc *sdesc;
-	va_list argp;
-	unsigned int dlen;
-	unsigned char *data;
-	int ret;
-
-	sdesc = init_sdesc(hmacalg);
-	if (IS_ERR(sdesc)) {
-		pr_info("trusted_key: can't alloc %s\n", hmac_alg);
-		return PTR_ERR(sdesc);
-	}
-
-	ret = crypto_shash_setkey(hmacalg, key, keylen);
-	if (ret < 0)
-		goto out;
-	ret = crypto_shash_init(&sdesc->shash);
-	if (ret < 0)
-		goto out;
-
-	va_start(argp, keylen);
-	for (;;) {
-		dlen = va_arg(argp, unsigned int);
-		if (dlen == 0)
-			break;
-		data = va_arg(argp, unsigned char *);
-		if (data == NULL) {
-			ret = -EINVAL;
-			break;
-		}
-		ret = crypto_shash_update(&sdesc->shash, data, dlen);
-		if (ret < 0)
-			break;
-	}
-	va_end(argp);
-	if (!ret)
-		ret = crypto_shash_final(&sdesc->shash, digest);
-out:
-	kzfree(sdesc);
-	return ret;
-}
-
-/*
- * calculate authorization info fields to send to TPM
- */
-int TSS_authhmac(unsigned char *digest, const unsigned char *key,
-			unsigned int keylen, unsigned char *h1,
-			unsigned char *h2, unsigned int h3, ...)
-{
-	unsigned char paramdigest[SHA1_DIGEST_SIZE];
-	struct sdesc *sdesc;
-	unsigned int dlen;
-	unsigned char *data;
-	unsigned char c;
-	int ret;
-	va_list argp;
-
-	if (!chip)
-		return -ENODEV;
-
-	sdesc = init_sdesc(hashalg);
-	if (IS_ERR(sdesc)) {
-		pr_info("trusted_key: can't alloc %s\n", hash_alg);
-		return PTR_ERR(sdesc);
-	}
-
-	c = !!h3;
-	ret = crypto_shash_init(&sdesc->shash);
-	if (ret < 0)
-		goto out;
-	va_start(argp, h3);
-	for (;;) {
-		dlen = va_arg(argp, unsigned int);
-		if (dlen == 0)
-			break;
-		data = va_arg(argp, unsigned char *);
-		if (!data) {
-			ret = -EINVAL;
-			break;
-		}
-		ret = crypto_shash_update(&sdesc->shash, data, dlen);
-		if (ret < 0)
-			break;
-	}
-	va_end(argp);
-	if (!ret)
-		ret = crypto_shash_final(&sdesc->shash, paramdigest);
-	if (!ret)
-		ret = TSS_rawhmac(digest, key, keylen, SHA1_DIGEST_SIZE,
-				  paramdigest, TPM_NONCE_SIZE, h1,
-				  TPM_NONCE_SIZE, h2, 1, &c, 0, 0);
-out:
-	kzfree(sdesc);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(TSS_authhmac);
-
-/*
- * verify the AUTH1_COMMAND (Seal) result from TPM
- */
-int TSS_checkhmac1(unsigned char *buffer,
-			  const uint32_t command,
-			  const unsigned char *ononce,
-			  const unsigned char *key,
-			  unsigned int keylen, ...)
-{
-	uint32_t bufsize;
-	uint16_t tag;
-	uint32_t ordinal;
-	uint32_t result;
-	unsigned char *enonce;
-	unsigned char *continueflag;
-	unsigned char *authdata;
-	unsigned char testhmac[SHA1_DIGEST_SIZE];
-	unsigned char paramdigest[SHA1_DIGEST_SIZE];
-	struct sdesc *sdesc;
-	unsigned int dlen;
-	unsigned int dpos;
-	va_list argp;
-	int ret;
-
-	if (!chip)
-		return -ENODEV;
-
-	bufsize = LOAD32(buffer, TPM_SIZE_OFFSET);
-	tag = LOAD16(buffer, 0);
-	ordinal = command;
-	result = LOAD32N(buffer, TPM_RETURN_OFFSET);
-	if (tag == TPM_TAG_RSP_COMMAND)
-		return 0;
-	if (tag != TPM_TAG_RSP_AUTH1_COMMAND)
-		return -EINVAL;
-	authdata = buffer + bufsize - SHA1_DIGEST_SIZE;
-	continueflag = authdata - 1;
-	enonce = continueflag - TPM_NONCE_SIZE;
-
-	sdesc = init_sdesc(hashalg);
-	if (IS_ERR(sdesc)) {
-		pr_info("trusted_key: can't alloc %s\n", hash_alg);
-		return PTR_ERR(sdesc);
-	}
-	ret = crypto_shash_init(&sdesc->shash);
-	if (ret < 0)
-		goto out;
-	ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result,
-				  sizeof result);
-	if (ret < 0)
-		goto out;
-	ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal,
-				  sizeof ordinal);
-	if (ret < 0)
-		goto out;
-	va_start(argp, keylen);
-	for (;;) {
-		dlen = va_arg(argp, unsigned int);
-		if (dlen == 0)
-			break;
-		dpos = va_arg(argp, unsigned int);
-		ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen);
-		if (ret < 0)
-			break;
-	}
-	va_end(argp);
-	if (!ret)
-		ret = crypto_shash_final(&sdesc->shash, paramdigest);
-	if (ret < 0)
-		goto out;
-
-	ret = TSS_rawhmac(testhmac, key, keylen, SHA1_DIGEST_SIZE, paramdigest,
-			  TPM_NONCE_SIZE, enonce, TPM_NONCE_SIZE, ononce,
-			  1, continueflag, 0, 0);
-	if (ret < 0)
-		goto out;
-
-	if (memcmp(testhmac, authdata, SHA1_DIGEST_SIZE))
-		ret = -EINVAL;
-out:
-	kzfree(sdesc);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(TSS_checkhmac1);
-
-/*
- * verify the AUTH2_COMMAND (unseal) result from TPM
- */
-static int TSS_checkhmac2(unsigned char *buffer,
-			  const uint32_t command,
-			  const unsigned char *ononce,
-			  const unsigned char *key1,
-			  unsigned int keylen1,
-			  const unsigned char *key2,
-			  unsigned int keylen2, ...)
-{
-	uint32_t bufsize;
-	uint16_t tag;
-	uint32_t ordinal;
-	uint32_t result;
-	unsigned char *enonce1;
-	unsigned char *continueflag1;
-	unsigned char *authdata1;
-	unsigned char *enonce2;
-	unsigned char *continueflag2;
-	unsigned char *authdata2;
-	unsigned char testhmac1[SHA1_DIGEST_SIZE];
-	unsigned char testhmac2[SHA1_DIGEST_SIZE];
-	unsigned char paramdigest[SHA1_DIGEST_SIZE];
-	struct sdesc *sdesc;
-	unsigned int dlen;
-	unsigned int dpos;
-	va_list argp;
-	int ret;
-
-	bufsize = LOAD32(buffer, TPM_SIZE_OFFSET);
-	tag = LOAD16(buffer, 0);
-	ordinal = command;
-	result = LOAD32N(buffer, TPM_RETURN_OFFSET);
-
-	if (tag == TPM_TAG_RSP_COMMAND)
-		return 0;
-	if (tag != TPM_TAG_RSP_AUTH2_COMMAND)
-		return -EINVAL;
-	authdata1 = buffer + bufsize - (SHA1_DIGEST_SIZE + 1
-			+ SHA1_DIGEST_SIZE + SHA1_DIGEST_SIZE);
-	authdata2 = buffer + bufsize - (SHA1_DIGEST_SIZE);
-	continueflag1 = authdata1 - 1;
-	continueflag2 = authdata2 - 1;
-	enonce1 = continueflag1 - TPM_NONCE_SIZE;
-	enonce2 = continueflag2 - TPM_NONCE_SIZE;
-
-	sdesc = init_sdesc(hashalg);
-	if (IS_ERR(sdesc)) {
-		pr_info("trusted_key: can't alloc %s\n", hash_alg);
-		return PTR_ERR(sdesc);
-	}
-	ret = crypto_shash_init(&sdesc->shash);
-	if (ret < 0)
-		goto out;
-	ret = crypto_shash_update(&sdesc->shash, (const u8 *)&result,
-				  sizeof result);
-	if (ret < 0)
-		goto out;
-	ret = crypto_shash_update(&sdesc->shash, (const u8 *)&ordinal,
-				  sizeof ordinal);
-	if (ret < 0)
-		goto out;
-
-	va_start(argp, keylen2);
-	for (;;) {
-		dlen = va_arg(argp, unsigned int);
-		if (dlen == 0)
-			break;
-		dpos = va_arg(argp, unsigned int);
-		ret = crypto_shash_update(&sdesc->shash, buffer + dpos, dlen);
-		if (ret < 0)
-			break;
-	}
-	va_end(argp);
-	if (!ret)
-		ret = crypto_shash_final(&sdesc->shash, paramdigest);
-	if (ret < 0)
-		goto out;
-
-	ret = TSS_rawhmac(testhmac1, key1, keylen1, SHA1_DIGEST_SIZE,
-			  paramdigest, TPM_NONCE_SIZE, enonce1,
-			  TPM_NONCE_SIZE, ononce, 1, continueflag1, 0, 0);
-	if (ret < 0)
-		goto out;
-	if (memcmp(testhmac1, authdata1, SHA1_DIGEST_SIZE)) {
-		ret = -EINVAL;
-		goto out;
-	}
-	ret = TSS_rawhmac(testhmac2, key2, keylen2, SHA1_DIGEST_SIZE,
-			  paramdigest, TPM_NONCE_SIZE, enonce2,
-			  TPM_NONCE_SIZE, ononce, 1, continueflag2, 0, 0);
-	if (ret < 0)
-		goto out;
-	if (memcmp(testhmac2, authdata2, SHA1_DIGEST_SIZE))
-		ret = -EINVAL;
-out:
-	kzfree(sdesc);
-	return ret;
-}
-
-/*
- * For key specific tpm requests, we will generate and send our
- * own TPM command packets using the drivers send function.
- */
-int trusted_tpm_send(unsigned char *cmd, size_t buflen)
-{
-	int rc;
-
-	if (!chip)
-		return -ENODEV;
-
-	dump_tpm_buf(cmd);
-	rc = tpm_send(chip, cmd, buflen);
-	dump_tpm_buf(cmd);
-	if (rc > 0)
-		/* Can't return positive return codes values to keyctl */
-		rc = -EPERM;
-	return rc;
-}
-EXPORT_SYMBOL_GPL(trusted_tpm_send);
-
-/*
- * Lock a trusted key, by extending a selected PCR.
- *
- * Prevents a trusted key that is sealed to PCRs from being accessed.
- * This uses the tpm driver's extend function.
- */
-static int pcrlock(const int pcrnum)
-{
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	return tpm_pcr_extend(chip, pcrnum, digests) ? -EINVAL : 0;
-}
-
-/*
- * Create an object specific authorisation protocol (OSAP) session
- */
-static int osap(struct tpm_buf *tb, struct osapsess *s,
-		const unsigned char *key, uint16_t type, uint32_t handle)
-{
-	unsigned char enonce[TPM_NONCE_SIZE];
-	unsigned char ononce[TPM_NONCE_SIZE];
-	int ret;
-
-	ret = tpm_get_random(chip, ononce, TPM_NONCE_SIZE);
-	if (ret != TPM_NONCE_SIZE)
-		return ret;
-
-	tpm_buf_reset(tb, TPM_TAG_RQU_COMMAND, TPM_ORD_OSAP);
-	tpm_buf_append_u16(tb, type);
-	tpm_buf_append_u32(tb, handle);
-	tpm_buf_append(tb, ononce, TPM_NONCE_SIZE);
-
-	ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE);
-	if (ret < 0)
-		return ret;
-
-	s->handle = LOAD32(tb->data, TPM_DATA_OFFSET);
-	memcpy(s->enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)]),
-	       TPM_NONCE_SIZE);
-	memcpy(enonce, &(tb->data[TPM_DATA_OFFSET + sizeof(uint32_t) +
-				  TPM_NONCE_SIZE]), TPM_NONCE_SIZE);
-	return TSS_rawhmac(s->secret, key, SHA1_DIGEST_SIZE, TPM_NONCE_SIZE,
-			   enonce, TPM_NONCE_SIZE, ononce, 0, 0);
-}
-
-/*
- * Create an object independent authorisation protocol (oiap) session
- */
-int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce)
-{
-	int ret;
-
-	if (!chip)
-		return -ENODEV;
-
-	tpm_buf_reset(tb, TPM_TAG_RQU_COMMAND, TPM_ORD_OIAP);
-	ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE);
-	if (ret < 0)
-		return ret;
-
-	*handle = LOAD32(tb->data, TPM_DATA_OFFSET);
-	memcpy(nonce, &tb->data[TPM_DATA_OFFSET + sizeof(uint32_t)],
-	       TPM_NONCE_SIZE);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(oiap);
-
-struct tpm_digests {
-	unsigned char encauth[SHA1_DIGEST_SIZE];
-	unsigned char pubauth[SHA1_DIGEST_SIZE];
-	unsigned char xorwork[SHA1_DIGEST_SIZE * 2];
-	unsigned char xorhash[SHA1_DIGEST_SIZE];
-	unsigned char nonceodd[TPM_NONCE_SIZE];
-};
-
-/*
- * Have the TPM seal(encrypt) the trusted key, possibly based on
- * Platform Configuration Registers (PCRs). AUTH1 for sealing key.
- */
-static int tpm_seal(struct tpm_buf *tb, uint16_t keytype,
-		    uint32_t keyhandle, const unsigned char *keyauth,
-		    const unsigned char *data, uint32_t datalen,
-		    unsigned char *blob, uint32_t *bloblen,
-		    const unsigned char *blobauth,
-		    const unsigned char *pcrinfo, uint32_t pcrinfosize)
-{
-	struct osapsess sess;
-	struct tpm_digests *td;
-	unsigned char cont;
-	uint32_t ordinal;
-	uint32_t pcrsize;
-	uint32_t datsize;
-	int sealinfosize;
-	int encdatasize;
-	int storedsize;
-	int ret;
-	int i;
-
-	/* alloc some work space for all the hashes */
-	td = kmalloc(sizeof *td, GFP_KERNEL);
-	if (!td)
-		return -ENOMEM;
-
-	/* get session for sealing key */
-	ret = osap(tb, &sess, keyauth, keytype, keyhandle);
-	if (ret < 0)
-		goto out;
-	dump_sess(&sess);
-
-	/* calculate encrypted authorization value */
-	memcpy(td->xorwork, sess.secret, SHA1_DIGEST_SIZE);
-	memcpy(td->xorwork + SHA1_DIGEST_SIZE, sess.enonce, SHA1_DIGEST_SIZE);
-	ret = TSS_sha1(td->xorwork, SHA1_DIGEST_SIZE * 2, td->xorhash);
-	if (ret < 0)
-		goto out;
-
-	ret = tpm_get_random(chip, td->nonceodd, TPM_NONCE_SIZE);
-	if (ret != TPM_NONCE_SIZE)
-		goto out;
-	ordinal = htonl(TPM_ORD_SEAL);
-	datsize = htonl(datalen);
-	pcrsize = htonl(pcrinfosize);
-	cont = 0;
-
-	/* encrypt data authorization key */
-	for (i = 0; i < SHA1_DIGEST_SIZE; ++i)
-		td->encauth[i] = td->xorhash[i] ^ blobauth[i];
-
-	/* calculate authorization HMAC value */
-	if (pcrinfosize == 0) {
-		/* no pcr info specified */
-		ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE,
-				   sess.enonce, td->nonceodd, cont,
-				   sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE,
-				   td->encauth, sizeof(uint32_t), &pcrsize,
-				   sizeof(uint32_t), &datsize, datalen, data, 0,
-				   0);
-	} else {
-		/* pcr info specified */
-		ret = TSS_authhmac(td->pubauth, sess.secret, SHA1_DIGEST_SIZE,
-				   sess.enonce, td->nonceodd, cont,
-				   sizeof(uint32_t), &ordinal, SHA1_DIGEST_SIZE,
-				   td->encauth, sizeof(uint32_t), &pcrsize,
-				   pcrinfosize, pcrinfo, sizeof(uint32_t),
-				   &datsize, datalen, data, 0, 0);
-	}
-	if (ret < 0)
-		goto out;
-
-	/* build and send the TPM request packet */
-	tpm_buf_reset(tb, TPM_TAG_RQU_AUTH1_COMMAND, TPM_ORD_SEAL);
-	tpm_buf_append_u32(tb, keyhandle);
-	tpm_buf_append(tb, td->encauth, SHA1_DIGEST_SIZE);
-	tpm_buf_append_u32(tb, pcrinfosize);
-	tpm_buf_append(tb, pcrinfo, pcrinfosize);
-	tpm_buf_append_u32(tb, datalen);
-	tpm_buf_append(tb, data, datalen);
-	tpm_buf_append_u32(tb, sess.handle);
-	tpm_buf_append(tb, td->nonceodd, TPM_NONCE_SIZE);
-	tpm_buf_append_u8(tb, cont);
-	tpm_buf_append(tb, td->pubauth, SHA1_DIGEST_SIZE);
-
-	ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE);
-	if (ret < 0)
-		goto out;
-
-	/* calculate the size of the returned Blob */
-	sealinfosize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t));
-	encdatasize = LOAD32(tb->data, TPM_DATA_OFFSET + sizeof(uint32_t) +
-			     sizeof(uint32_t) + sealinfosize);
-	storedsize = sizeof(uint32_t) + sizeof(uint32_t) + sealinfosize +
-	    sizeof(uint32_t) + encdatasize;
-
-	/* check the HMAC in the response */
-	ret = TSS_checkhmac1(tb->data, ordinal, td->nonceodd, sess.secret,
-			     SHA1_DIGEST_SIZE, storedsize, TPM_DATA_OFFSET, 0,
-			     0);
-
-	/* copy the returned blob to caller */
-	if (!ret) {
-		memcpy(blob, tb->data + TPM_DATA_OFFSET, storedsize);
-		*bloblen = storedsize;
-	}
-out:
-	kzfree(td);
-	return ret;
-}
-
-/*
- * use the AUTH2_COMMAND form of unseal, to authorize both key and blob
- */
-static int tpm_unseal(struct tpm_buf *tb,
-		      uint32_t keyhandle, const unsigned char *keyauth,
-		      const unsigned char *blob, int bloblen,
-		      const unsigned char *blobauth,
-		      unsigned char *data, unsigned int *datalen)
-{
-	unsigned char nonceodd[TPM_NONCE_SIZE];
-	unsigned char enonce1[TPM_NONCE_SIZE];
-	unsigned char enonce2[TPM_NONCE_SIZE];
-	unsigned char authdata1[SHA1_DIGEST_SIZE];
-	unsigned char authdata2[SHA1_DIGEST_SIZE];
-	uint32_t authhandle1 = 0;
-	uint32_t authhandle2 = 0;
-	unsigned char cont = 0;
-	uint32_t ordinal;
-	uint32_t keyhndl;
-	int ret;
-
-	/* sessions for unsealing key and data */
-	ret = oiap(tb, &authhandle1, enonce1);
-	if (ret < 0) {
-		pr_info("trusted_key: oiap failed (%d)\n", ret);
-		return ret;
-	}
-	ret = oiap(tb, &authhandle2, enonce2);
-	if (ret < 0) {
-		pr_info("trusted_key: oiap failed (%d)\n", ret);
-		return ret;
-	}
-
-	ordinal = htonl(TPM_ORD_UNSEAL);
-	keyhndl = htonl(SRKHANDLE);
-	ret = tpm_get_random(chip, nonceodd, TPM_NONCE_SIZE);
-	if (ret != TPM_NONCE_SIZE) {
-		pr_info("trusted_key: tpm_get_random failed (%d)\n", ret);
-		return ret;
-	}
-	ret = TSS_authhmac(authdata1, keyauth, TPM_NONCE_SIZE,
-			   enonce1, nonceodd, cont, sizeof(uint32_t),
-			   &ordinal, bloblen, blob, 0, 0);
-	if (ret < 0)
-		return ret;
-	ret = TSS_authhmac(authdata2, blobauth, TPM_NONCE_SIZE,
-			   enonce2, nonceodd, cont, sizeof(uint32_t),
-			   &ordinal, bloblen, blob, 0, 0);
-	if (ret < 0)
-		return ret;
-
-	/* build and send TPM request packet */
-	tpm_buf_reset(tb, TPM_TAG_RQU_AUTH2_COMMAND, TPM_ORD_UNSEAL);
-	tpm_buf_append_u32(tb, keyhandle);
-	tpm_buf_append(tb, blob, bloblen);
-	tpm_buf_append_u32(tb, authhandle1);
-	tpm_buf_append(tb, nonceodd, TPM_NONCE_SIZE);
-	tpm_buf_append_u8(tb, cont);
-	tpm_buf_append(tb, authdata1, SHA1_DIGEST_SIZE);
-	tpm_buf_append_u32(tb, authhandle2);
-	tpm_buf_append(tb, nonceodd, TPM_NONCE_SIZE);
-	tpm_buf_append_u8(tb, cont);
-	tpm_buf_append(tb, authdata2, SHA1_DIGEST_SIZE);
-
-	ret = trusted_tpm_send(tb->data, MAX_BUF_SIZE);
-	if (ret < 0) {
-		pr_info("trusted_key: authhmac failed (%d)\n", ret);
-		return ret;
-	}
-
-	*datalen = LOAD32(tb->data, TPM_DATA_OFFSET);
-	ret = TSS_checkhmac2(tb->data, ordinal, nonceodd,
-			     keyauth, SHA1_DIGEST_SIZE,
-			     blobauth, SHA1_DIGEST_SIZE,
-			     sizeof(uint32_t), TPM_DATA_OFFSET,
-			     *datalen, TPM_DATA_OFFSET + sizeof(uint32_t), 0,
-			     0);
-	if (ret < 0) {
-		pr_info("trusted_key: TSS_checkhmac2 failed (%d)\n", ret);
-		return ret;
-	}
-	memcpy(data, tb->data + TPM_DATA_OFFSET + sizeof(uint32_t), *datalen);
-	return 0;
-}
-
-/*
- * Have the TPM seal(encrypt) the symmetric key
- */
-static int key_seal(struct trusted_key_payload *p,
-		    struct trusted_key_options *o)
-{
-	struct tpm_buf tb;
-	int ret;
-
-	ret = tpm_buf_init(&tb, 0, 0);
-	if (ret)
-		return ret;
-
-	/* include migratable flag at end of sealed key */
-	p->key[p->key_len] = p->migratable;
-
-	ret = tpm_seal(&tb, o->keytype, o->keyhandle, o->keyauth,
-		       p->key, p->key_len + 1, p->blob, &p->blob_len,
-		       o->blobauth, o->pcrinfo, o->pcrinfo_len);
-	if (ret < 0)
-		pr_info("trusted_key: srkseal failed (%d)\n", ret);
-
-	tpm_buf_destroy(&tb);
-	return ret;
-}
-
-/*
- * Have the TPM unseal(decrypt) the symmetric key
- */
-static int key_unseal(struct trusted_key_payload *p,
-		      struct trusted_key_options *o)
-{
-	struct tpm_buf tb;
-	int ret;
-
-	ret = tpm_buf_init(&tb, 0, 0);
-	if (ret)
-		return ret;
-
-	ret = tpm_unseal(&tb, o->keyhandle, o->keyauth, p->blob, p->blob_len,
-			 o->blobauth, p->key, &p->key_len);
-	if (ret < 0)
-		pr_info("trusted_key: srkunseal failed (%d)\n", ret);
-	else
-		/* pull migratable flag out of sealed key */
-		p->migratable = p->key[--p->key_len];
-
-	tpm_buf_destroy(&tb);
-	return ret;
-}
-
-enum {
-	Opt_err,
-	Opt_new, Opt_load, Opt_update,
-	Opt_keyhandle, Opt_keyauth, Opt_blobauth,
-	Opt_pcrinfo, Opt_pcrlock, Opt_migratable,
-	Opt_hash,
-	Opt_policydigest,
-	Opt_policyhandle,
-};
-
-static const match_table_t key_tokens = {
-	{Opt_new, "new"},
-	{Opt_load, "load"},
-	{Opt_update, "update"},
-	{Opt_keyhandle, "keyhandle=%s"},
-	{Opt_keyauth, "keyauth=%s"},
-	{Opt_blobauth, "blobauth=%s"},
-	{Opt_pcrinfo, "pcrinfo=%s"},
-	{Opt_pcrlock, "pcrlock=%s"},
-	{Opt_migratable, "migratable=%s"},
-	{Opt_hash, "hash=%s"},
-	{Opt_policydigest, "policydigest=%s"},
-	{Opt_policyhandle, "policyhandle=%s"},
-	{Opt_err, NULL}
-};
-
-/* can have zero or more token= options */
-static int getoptions(char *c, struct trusted_key_payload *pay,
-		      struct trusted_key_options *opt)
-{
-	substring_t args[MAX_OPT_ARGS];
-	char *p = c;
-	int token;
-	int res;
-	unsigned long handle;
-	unsigned long lock;
-	unsigned long token_mask = 0;
-	unsigned int digest_len;
-	int i;
-	int tpm2;
-
-	tpm2 = tpm_is_tpm2(chip);
-	if (tpm2 < 0)
-		return tpm2;
-
-	opt->hash = tpm2 ? HASH_ALGO_SHA256 : HASH_ALGO_SHA1;
-
-	while ((p = strsep(&c, " \t"))) {
-		if (*p == '\0' || *p == ' ' || *p == '\t')
-			continue;
-		token = match_token(p, key_tokens, args);
-		if (test_and_set_bit(token, &token_mask))
-			return -EINVAL;
-
-		switch (token) {
-		case Opt_pcrinfo:
-			opt->pcrinfo_len = strlen(args[0].from) / 2;
-			if (opt->pcrinfo_len > MAX_PCRINFO_SIZE)
-				return -EINVAL;
-			res = hex2bin(opt->pcrinfo, args[0].from,
-				      opt->pcrinfo_len);
-			if (res < 0)
-				return -EINVAL;
-			break;
-		case Opt_keyhandle:
-			res = kstrtoul(args[0].from, 16, &handle);
-			if (res < 0)
-				return -EINVAL;
-			opt->keytype = SEAL_keytype;
-			opt->keyhandle = handle;
-			break;
-		case Opt_keyauth:
-			if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE)
-				return -EINVAL;
-			res = hex2bin(opt->keyauth, args[0].from,
-				      SHA1_DIGEST_SIZE);
-			if (res < 0)
-				return -EINVAL;
-			break;
-		case Opt_blobauth:
-			if (strlen(args[0].from) != 2 * SHA1_DIGEST_SIZE)
-				return -EINVAL;
-			res = hex2bin(opt->blobauth, args[0].from,
-				      SHA1_DIGEST_SIZE);
-			if (res < 0)
-				return -EINVAL;
-			break;
-		case Opt_migratable:
-			if (*args[0].from == '0')
-				pay->migratable = 0;
-			else
-				return -EINVAL;
-			break;
-		case Opt_pcrlock:
-			res = kstrtoul(args[0].from, 10, &lock);
-			if (res < 0)
-				return -EINVAL;
-			opt->pcrlock = lock;
-			break;
-		case Opt_hash:
-			if (test_bit(Opt_policydigest, &token_mask))
-				return -EINVAL;
-			for (i = 0; i < HASH_ALGO__LAST; i++) {
-				if (!strcmp(args[0].from, hash_algo_name[i])) {
-					opt->hash = i;
-					break;
-				}
-			}
-			if (i == HASH_ALGO__LAST)
-				return -EINVAL;
-			if  (!tpm2 && i != HASH_ALGO_SHA1) {
-				pr_info("trusted_key: TPM 1.x only supports SHA-1.\n");
-				return -EINVAL;
-			}
-			break;
-		case Opt_policydigest:
-			digest_len = hash_digest_size[opt->hash];
-			if (!tpm2 || strlen(args[0].from) != (2 * digest_len))
-				return -EINVAL;
-			res = hex2bin(opt->policydigest, args[0].from,
-				      digest_len);
-			if (res < 0)
-				return -EINVAL;
-			opt->policydigest_len = digest_len;
-			break;
-		case Opt_policyhandle:
-			if (!tpm2)
-				return -EINVAL;
-			res = kstrtoul(args[0].from, 16, &handle);
-			if (res < 0)
-				return -EINVAL;
-			opt->policyhandle = handle;
-			break;
-		default:
-			return -EINVAL;
-		}
-	}
-	return 0;
-}
-
-/*
- * datablob_parse - parse the keyctl data and fill in the
- * 		    payload and options structures
- *
- * On success returns 0, otherwise -EINVAL.
- */
-static int datablob_parse(char *datablob, struct trusted_key_payload *p,
-			  struct trusted_key_options *o)
-{
-	substring_t args[MAX_OPT_ARGS];
-	long keylen;
-	int ret = -EINVAL;
-	int key_cmd;
-	char *c;
-
-	/* main command */
-	c = strsep(&datablob, " \t");
-	if (!c)
-		return -EINVAL;
-	key_cmd = match_token(c, key_tokens, args);
-	switch (key_cmd) {
-	case Opt_new:
-		/* first argument is key size */
-		c = strsep(&datablob, " \t");
-		if (!c)
-			return -EINVAL;
-		ret = kstrtol(c, 10, &keylen);
-		if (ret < 0 || keylen < MIN_KEY_SIZE || keylen > MAX_KEY_SIZE)
-			return -EINVAL;
-		p->key_len = keylen;
-		ret = getoptions(datablob, p, o);
-		if (ret < 0)
-			return ret;
-		ret = Opt_new;
-		break;
-	case Opt_load:
-		/* first argument is sealed blob */
-		c = strsep(&datablob, " \t");
-		if (!c)
-			return -EINVAL;
-		p->blob_len = strlen(c) / 2;
-		if (p->blob_len > MAX_BLOB_SIZE)
-			return -EINVAL;
-		ret = hex2bin(p->blob, c, p->blob_len);
-		if (ret < 0)
-			return -EINVAL;
-		ret = getoptions(datablob, p, o);
-		if (ret < 0)
-			return ret;
-		ret = Opt_load;
-		break;
-	case Opt_update:
-		/* all arguments are options */
-		ret = getoptions(datablob, p, o);
-		if (ret < 0)
-			return ret;
-		ret = Opt_update;
-		break;
-	case Opt_err:
-		return -EINVAL;
-		break;
-	}
-	return ret;
-}
-
-static struct trusted_key_options *trusted_options_alloc(void)
-{
-	struct trusted_key_options *options;
-	int tpm2;
-
-	tpm2 = tpm_is_tpm2(chip);
-	if (tpm2 < 0)
-		return NULL;
-
-	options = kzalloc(sizeof *options, GFP_KERNEL);
-	if (options) {
-		/* set any non-zero defaults */
-		options->keytype = SRK_keytype;
-
-		if (!tpm2)
-			options->keyhandle = SRKHANDLE;
-	}
-	return options;
-}
-
-static struct trusted_key_payload *trusted_payload_alloc(struct key *key)
-{
-	struct trusted_key_payload *p = NULL;
-	int ret;
-
-	ret = key_payload_reserve(key, sizeof *p);
-	if (ret < 0)
-		return p;
-	p = kzalloc(sizeof *p, GFP_KERNEL);
-	if (p)
-		p->migratable = 1; /* migratable by default */
-	return p;
-}
-
-/*
- * trusted_instantiate - create a new trusted key
- *
- * Unseal an existing trusted blob or, for a new key, get a
- * random key, then seal and create a trusted key-type key,
- * adding it to the specified keyring.
- *
- * On success, return 0. Otherwise return errno.
- */
-static int trusted_instantiate(struct key *key,
-			       struct key_preparsed_payload *prep)
-{
-	struct trusted_key_payload *payload = NULL;
-	struct trusted_key_options *options = NULL;
-	size_t datalen = prep->datalen;
-	char *datablob;
-	int ret = 0;
-	int key_cmd;
-	size_t key_len;
-	int tpm2;
-
-	tpm2 = tpm_is_tpm2(chip);
-	if (tpm2 < 0)
-		return tpm2;
-
-	if (datalen <= 0 || datalen > 32767 || !prep->data)
-		return -EINVAL;
-
-	datablob = kmalloc(datalen + 1, GFP_KERNEL);
-	if (!datablob)
-		return -ENOMEM;
-	memcpy(datablob, prep->data, datalen);
-	datablob[datalen] = '\0';
-
-	options = trusted_options_alloc();
-	if (!options) {
-		ret = -ENOMEM;
-		goto out;
-	}
-	payload = trusted_payload_alloc(key);
-	if (!payload) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	key_cmd = datablob_parse(datablob, payload, options);
-	if (key_cmd < 0) {
-		ret = key_cmd;
-		goto out;
-	}
-
-	if (!options->keyhandle) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	dump_payload(payload);
-	dump_options(options);
-
-	switch (key_cmd) {
-	case Opt_load:
-		if (tpm2)
-			ret = tpm_unseal_trusted(chip, payload, options);
-		else
-			ret = key_unseal(payload, options);
-		dump_payload(payload);
-		dump_options(options);
-		if (ret < 0)
-			pr_info("trusted_key: key_unseal failed (%d)\n", ret);
-		break;
-	case Opt_new:
-		key_len = payload->key_len;
-		ret = tpm_get_random(chip, payload->key, key_len);
-		if (ret != key_len) {
-			pr_info("trusted_key: key_create failed (%d)\n", ret);
-			goto out;
-		}
-		if (tpm2)
-			ret = tpm_seal_trusted(chip, payload, options);
-		else
-			ret = key_seal(payload, options);
-		if (ret < 0)
-			pr_info("trusted_key: key_seal failed (%d)\n", ret);
-		break;
-	default:
-		ret = -EINVAL;
-		goto out;
-	}
-	if (!ret && options->pcrlock)
-		ret = pcrlock(options->pcrlock);
-out:
-	kzfree(datablob);
-	kzfree(options);
-	if (!ret)
-		rcu_assign_keypointer(key, payload);
-	else
-		kzfree(payload);
-	return ret;
-}
-
-static void trusted_rcu_free(struct rcu_head *rcu)
-{
-	struct trusted_key_payload *p;
-
-	p = container_of(rcu, struct trusted_key_payload, rcu);
-	kzfree(p);
-}
-
-/*
- * trusted_update - reseal an existing key with new PCR values
- */
-static int trusted_update(struct key *key, struct key_preparsed_payload *prep)
-{
-	struct trusted_key_payload *p;
-	struct trusted_key_payload *new_p;
-	struct trusted_key_options *new_o;
-	size_t datalen = prep->datalen;
-	char *datablob;
-	int ret = 0;
-
-	if (key_is_negative(key))
-		return -ENOKEY;
-	p = key->payload.data[0];
-	if (!p->migratable)
-		return -EPERM;
-	if (datalen <= 0 || datalen > 32767 || !prep->data)
-		return -EINVAL;
-
-	datablob = kmalloc(datalen + 1, GFP_KERNEL);
-	if (!datablob)
-		return -ENOMEM;
-	new_o = trusted_options_alloc();
-	if (!new_o) {
-		ret = -ENOMEM;
-		goto out;
-	}
-	new_p = trusted_payload_alloc(key);
-	if (!new_p) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	memcpy(datablob, prep->data, datalen);
-	datablob[datalen] = '\0';
-	ret = datablob_parse(datablob, new_p, new_o);
-	if (ret != Opt_update) {
-		ret = -EINVAL;
-		kzfree(new_p);
-		goto out;
-	}
-
-	if (!new_o->keyhandle) {
-		ret = -EINVAL;
-		kzfree(new_p);
-		goto out;
-	}
-
-	/* copy old key values, and reseal with new pcrs */
-	new_p->migratable = p->migratable;
-	new_p->key_len = p->key_len;
-	memcpy(new_p->key, p->key, p->key_len);
-	dump_payload(p);
-	dump_payload(new_p);
-
-	ret = key_seal(new_p, new_o);
-	if (ret < 0) {
-		pr_info("trusted_key: key_seal failed (%d)\n", ret);
-		kzfree(new_p);
-		goto out;
-	}
-	if (new_o->pcrlock) {
-		ret = pcrlock(new_o->pcrlock);
-		if (ret < 0) {
-			pr_info("trusted_key: pcrlock failed (%d)\n", ret);
-			kzfree(new_p);
-			goto out;
-		}
-	}
-	rcu_assign_keypointer(key, new_p);
-	call_rcu(&p->rcu, trusted_rcu_free);
-out:
-	kzfree(datablob);
-	kzfree(new_o);
-	return ret;
-}
-
-/*
- * trusted_read - copy the sealed blob data to userspace in hex.
- * On success, return to userspace the trusted key datablob size.
- */
-static long trusted_read(const struct key *key, char __user *buffer,
-			 size_t buflen)
-{
-	const struct trusted_key_payload *p;
-	char *ascii_buf;
-	char *bufp;
-	int i;
-
-	p = dereference_key_locked(key);
-	if (!p)
-		return -EINVAL;
-
-	if (buffer && buflen >= 2 * p->blob_len) {
-		ascii_buf = kmalloc_array(2, p->blob_len, GFP_KERNEL);
-		if (!ascii_buf)
-			return -ENOMEM;
-
-		bufp = ascii_buf;
-		for (i = 0; i < p->blob_len; i++)
-			bufp = hex_byte_pack(bufp, p->blob[i]);
-		if (copy_to_user(buffer, ascii_buf, 2 * p->blob_len) != 0) {
-			kzfree(ascii_buf);
-			return -EFAULT;
-		}
-		kzfree(ascii_buf);
-	}
-	return 2 * p->blob_len;
-}
-
-/*
- * trusted_destroy - clear and free the key's payload
- */
-static void trusted_destroy(struct key *key)
-{
-	kzfree(key->payload.data[0]);
-}
-
-struct key_type key_type_trusted = {
-	.name = "trusted",
-	.instantiate = trusted_instantiate,
-	.update = trusted_update,
-	.destroy = trusted_destroy,
-	.describe = user_describe,
-	.read = trusted_read,
-};
-
-EXPORT_SYMBOL_GPL(key_type_trusted);
-
-static void trusted_shash_release(void)
-{
-	if (hashalg)
-		crypto_free_shash(hashalg);
-	if (hmacalg)
-		crypto_free_shash(hmacalg);
-}
-
-static int __init trusted_shash_alloc(void)
-{
-	int ret;
-
-	hmacalg = crypto_alloc_shash(hmac_alg, 0, 0);
-	if (IS_ERR(hmacalg)) {
-		pr_info("trusted_key: could not allocate crypto %s\n",
-			hmac_alg);
-		return PTR_ERR(hmacalg);
-	}
-
-	hashalg = crypto_alloc_shash(hash_alg, 0, 0);
-	if (IS_ERR(hashalg)) {
-		pr_info("trusted_key: could not allocate crypto %s\n",
-			hash_alg);
-		ret = PTR_ERR(hashalg);
-		goto hashalg_fail;
-	}
-
-	return 0;
-
-hashalg_fail:
-	crypto_free_shash(hmacalg);
-	return ret;
-}
-
-static int __init init_digests(void)
-{
-	int i;
-
-	digests = kcalloc(chip->nr_allocated_banks, sizeof(*digests),
-			  GFP_KERNEL);
-	if (!digests)
-		return -ENOMEM;
-
-	for (i = 0; i < chip->nr_allocated_banks; i++)
-		digests[i].alg_id = chip->allocated_banks[i].alg_id;
-
-	return 0;
-}
-
-static int __init init_trusted(void)
-{
-	int ret;
-
-	/* encrypted_keys.ko depends on successful load of this module even if
-	 * TPM is not used.
-	 */
-	chip = tpm_default_chip();
-	if (!chip)
-		return 0;
-
-	ret = init_digests();
-	if (ret < 0)
-		goto err_put;
-	ret = trusted_shash_alloc();
-	if (ret < 0)
-		goto err_free;
-	ret = register_key_type(&key_type_trusted);
-	if (ret < 0)
-		goto err_release;
-	return 0;
-err_release:
-	trusted_shash_release();
-err_free:
-	kfree(digests);
-err_put:
-	put_device(&chip->dev);
-	return ret;
-}
-
-static void __exit cleanup_trusted(void)
-{
-	if (chip) {
-		put_device(&chip->dev);
-		kfree(digests);
-		trusted_shash_release();
-		unregister_key_type(&key_type_trusted);
-	}
-}
-
-late_initcall(init_trusted);
-module_exit(cleanup_trusted);
-
-MODULE_LICENSE("GPL");