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* [PATCH v8 0/8] TPM 2.0 trusted keys with attached policy
@ 2020-03-10  5:09 James Bottomley
  2020-03-10  5:09 ` [PATCH v8 1/8] lib: add ASN.1 encoder James Bottomley
  0 siblings, 1 reply; 4+ messages in thread
From: James Bottomley @ 2020-03-10  5:09 UTC (permalink / raw)
  To: linux-integrity; +Cc: Mimi Zohar, Jarkko Sakkinen, David Woodhouse, keyrings

This is a respin to separate patch 4 into the original three patches
it was.  I've done testing with each of the three splinters, so I
think I've got the split correct.

General cover letter:

This patch updates the trusted key code to export keys in the ASN.1
format used by current TPM key tools (openssl_tpm2_engine and
openconnect).  It also simplifies the use of policy with keys because
the ASN.1 format is designed to carry a description of how to
construct the policy, with the result that simple policies (like
authorization and PCR locking) can now be constructed and used in the
kernel, bringing the TPM 2.0 policy use into line with how TPM 1.2
works.

The key format is designed to be compatible with our two openssl
engine implementations as well as with the format used by openconnect.
I've added seal/unseal to my engine so I can use it for
interoperability testing and I'll later use this for sealed symmetric
keys via engine:

https://git.kernel.org/pub/scm/linux/kernel/git/jejb/openssl_tpm2_engine.git/

James

---

James Bottomley (8):
  lib: add ASN.1 encoder
  oid_registry: Add TCG defined OIDS for TPM keys
  security: keys: trusted: fix TPM2 authorizations
  security: keys: trusted: use ASN.1 TPM2 key format for the blobs
  security: keys: trusted: Make sealed key properly interoperable
  security: keys: trusted: add PCR policy to TPM2 keys
  security: keys: trusted: add ability to specify arbitrary policy
  security: keys: trusted: implement counter/timer policy

 Documentation/security/keys/trusted-encrypted.rst |  64 ++-
 include/keys/trusted-type.h                       |   7 +-
 include/linux/asn1_encoder.h                      |  32 ++
 include/linux/oid_registry.h                      |   5 +
 include/linux/tpm.h                               |   8 +
 lib/Makefile                                      |   2 +-
 lib/asn1_encoder.c                                | 431 ++++++++++++++++++++
 security/keys/Kconfig                             |   2 +
 security/keys/trusted-keys/Makefile               |   2 +-
 security/keys/trusted-keys/tpm2-policy.c          | 463 ++++++++++++++++++++++
 security/keys/trusted-keys/tpm2-policy.h          |  31 ++
 security/keys/trusted-keys/tpm2key.asn1           |  23 ++
 security/keys/trusted-keys/trusted_tpm1.c         |  56 ++-
 security/keys/trusted-keys/trusted_tpm2.c         | 370 +++++++++++++++--
 14 files changed, 1459 insertions(+), 37 deletions(-)
 create mode 100644 include/linux/asn1_encoder.h
 create mode 100644 lib/asn1_encoder.c
 create mode 100644 security/keys/trusted-keys/tpm2-policy.c
 create mode 100644 security/keys/trusted-keys/tpm2-policy.h
 create mode 100644 security/keys/trusted-keys/tpm2key.asn1

-- 
2.16.4


^ permalink raw reply	[flat|nested] 4+ messages in thread

* [PATCH v8 1/8] lib: add ASN.1 encoder
  2020-03-10  5:09 [PATCH v8 0/8] TPM 2.0 trusted keys with attached policy James Bottomley
@ 2020-03-10  5:09 ` James Bottomley
  2020-03-10 15:22   ` James Bottomley
  0 siblings, 1 reply; 4+ messages in thread
From: James Bottomley @ 2020-03-10  5:09 UTC (permalink / raw)
  To: linux-integrity; +Cc: Mimi Zohar, Jarkko Sakkinen, David Woodhouse, keyrings

We have a need in the TPM2 trusted keys to return the ASN.1 form of
the TPM key blob so it can be operated on by tools outside of the
kernel.  The specific tools are the openssl_tpm2_engine, openconnect
and the Intel tpm2-tss-engine.  To do that, we have to be able to read
and write the same binary key format the tools use.  The current ASN.1
decoder does fine for reading, but we need pieces of an ASN.1 encoder
to write the key blob in binary compatible form.

For backwards compatibility, the trusted key reader code will still
accept the two TPM2B quantities that it uses today, but the writer
will only output the ASN.1 form.

The current implementation only encodes the ASN.1 bits we actually need.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

---

v2: updated API to use indefinite length, and made symbol exports gpl
v3: add data length error handling
v4: use end_data instead of data_len pointer
v5: mention tools and space out code
v7: reverse christmas tree variable definitions and better spacing
---
 include/linux/asn1_encoder.h |  32 ++++
 lib/Makefile                 |   2 +-
 lib/asn1_encoder.c           | 431 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 464 insertions(+), 1 deletion(-)
 create mode 100644 include/linux/asn1_encoder.h
 create mode 100644 lib/asn1_encoder.c

diff --git a/include/linux/asn1_encoder.h b/include/linux/asn1_encoder.h
new file mode 100644
index 000000000000..08cd0c2ad34f
--- /dev/null
+++ b/include/linux/asn1_encoder.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _LINUX_ASN1_ENCODER_H
+#define _LINUX_ASN1_ENCODER_H
+
+#include <linux/types.h>
+#include <linux/asn1.h>
+#include <linux/asn1_ber_bytecode.h>
+#include <linux/bug.h>
+
+#define asn1_oid_len(oid) (sizeof(oid)/sizeof(u32))
+unsigned char *
+asn1_encode_integer(unsigned char *data, const unsigned char *end_data,
+		    s64 integer);
+unsigned char *
+asn1_encode_oid(unsigned char *data, const unsigned char *end_data,
+		u32 oid[], int oid_len);
+unsigned char *
+asn1_encode_tag(unsigned char *data, const unsigned char *end_data,
+		u32 tag, const unsigned char *string, int len);
+unsigned char *
+asn1_encode_octet_string(unsigned char *data,
+			 const unsigned char *end_data,
+			 const unsigned char *string, u32 len);
+unsigned char *
+asn1_encode_sequence(unsigned char *data, const unsigned char *end_data,
+		     const unsigned char *seq, int len);
+unsigned char *
+asn1_encode_boolean(unsigned char *data, const unsigned char *end_data,
+		    bool val);
+
+#endif
diff --git a/lib/Makefile b/lib/Makefile
index 611872c06926..1a9169ef2bed 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -237,7 +237,7 @@ obj-$(CONFIG_INTERVAL_TREE_TEST) += interval_tree_test.o
 
 obj-$(CONFIG_PERCPU_TEST) += percpu_test.o
 
-obj-$(CONFIG_ASN1) += asn1_decoder.o
+obj-$(CONFIG_ASN1) += asn1_decoder.o asn1_encoder.o
 
 obj-$(CONFIG_FONT_SUPPORT) += fonts/
 
diff --git a/lib/asn1_encoder.c b/lib/asn1_encoder.c
new file mode 100644
index 000000000000..24d45a838887
--- /dev/null
+++ b/lib/asn1_encoder.c
@@ -0,0 +1,431 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Simple encoder primitives for ASN.1 BER/DER/CER
+ *
+ * Copyright (C) 2019 James.Bottomley@HansenPartnership.com
+ */
+
+#include <linux/asn1_encoder.h>
+#include <linux/bug.h>
+#include <linux/string.h>
+#include <linux/module.h>
+
+/**
+ * asn1_encode_integer() - encode positive integer to ASN.1
+ * @data:	pointer to the pointer to the data
+ * @end_data:	end of data pointer, points one beyond last usable byte in @data
+ * @integer:	integer to be encoded
+ *
+ * This is a simplified encoder: it only currently does
+ * positive integers, but it should be simple enough to add the
+ * negative case if a use comes along.
+ */
+unsigned char *
+asn1_encode_integer(unsigned char *data, const unsigned char *end_data,
+		    s64 integer)
+{
+	int data_len = end_data - data;
+	unsigned char *d = &data[2];
+	bool found = false;
+	int i;
+
+	if (WARN(integer < 0,
+		 "BUG: integer encode only supports positive integers"))
+		return ERR_PTR(-EINVAL);
+
+	if (IS_ERR(data))
+		return data;
+
+	/* need at least 3 bytes for tag, length and integer encoding */
+	if (data_len < 3)
+		return ERR_PTR(-EINVAL);
+
+	/* remaining length where at d (the start of the integer encoding) */
+	data_len -= 2;
+
+	data[0] = _tag(UNIV, PRIM, INT);
+	if (integer == 0) {
+		*d++ = 0;
+		goto out;
+	}
+
+	for (i = sizeof(integer); i > 0 ; i--) {
+		int byte = integer >> (8 * (i - 1));
+
+		if (!found && byte == 0)
+			continue;
+
+		/*
+		 * for a positive number the first byte must have bit
+		 * 7 clear in two's complement (otherwise it's a
+		 * negative number) so prepend a leading zero if
+		 * that's not the case
+		 */
+		if (!found && (byte & 0x80)) {
+			/*
+			 * no check needed here, we already know we
+			 * have len >= 1
+			 */
+			*d++ = 0;
+			data_len--;
+		}
+
+		found = true;
+		if (data_len == 0)
+			return ERR_PTR(-EINVAL);
+
+		*d++ = byte;
+		data_len--;
+	}
+
+ out:
+	data[1] = d - data - 2;
+
+	return d;
+}
+EXPORT_SYMBOL_GPL(asn1_encode_integer);
+
+/* calculate the base 128 digit values setting the top bit of the first octet */
+static int asn1_encode_oid_digit(unsigned char **_data, int *data_len, u32 oid)
+{
+	unsigned char *data = *_data;
+	int start = 7 + 7 + 7 + 7;
+	int ret = 0;
+
+	if (*data_len < 1)
+		return -EINVAL;
+
+	/* quick case */
+	if (oid == 0) {
+		*data++ = 0x80;
+		(*data_len)--;
+		goto out;
+	}
+
+	while (oid >> start == 0)
+		start -= 7;
+
+	while (start > 0 && *data_len > 0) {
+		u8 byte;
+
+		byte = oid >> start;
+		oid = oid - (byte << start);
+		start -= 7;
+		byte |= 0x80;
+		*data++ = byte;
+		(*data_len)--;
+	}
+
+	if (*data_len > 0) {
+		*data++ = oid;
+		(*data_len)--;
+	} else {
+		ret = -EINVAL;
+	}
+
+ out:
+	*_data = data;
+	return ret;
+}
+
+/**
+ * asn1_encode_oid() - encode an oid to ASN.1
+ * @data:	position to begin encoding at
+ * @end_data:	end of data pointer, points one beyond last usable byte in @data
+ * @oid:	array of oids
+ * @oid_len:	length of oid array
+ *
+ * this encodes an OID up to ASN.1 when presented as an array of OID values
+ */
+unsigned char *
+asn1_encode_oid(unsigned char *data, const unsigned char *end_data,
+		u32 oid[], int oid_len)
+{
+	int data_len = end_data - data;
+	unsigned char *d = data + 2;
+	int i, ret;
+
+	if (WARN(oid_len < 2, "OID must have at least two elements"))
+		return ERR_PTR(-EINVAL);
+
+	if (WARN(oid_len > 32, "OID is too large"))
+		return ERR_PTR(-EINVAL);
+
+	if (IS_ERR(data))
+		return data;
+
+
+	/* need at least 3 bytes for tag, length and OID encoding */
+	if (data_len < 3)
+		return ERR_PTR(-EINVAL);
+
+	data[0] = _tag(UNIV, PRIM, OID);
+	*d++ = oid[0] * 40 + oid[1];
+
+	data_len -= 3;
+
+	ret = 0;
+
+	for (i = 2; i < oid_len; i++) {
+		ret = asn1_encode_oid_digit(&d, &data_len, oid[i]);
+		if (ret < 0)
+			return ERR_PTR(ret);
+	}
+
+	data[1] = d - data - 2;
+
+	return d;
+}
+EXPORT_SYMBOL_GPL(asn1_encode_oid);
+
+static int asn1_encode_length(unsigned char **data, int *data_len, int len)
+{
+	if (*data_len < 1)
+		return -EINVAL;
+
+	if (len < 0) {
+		*((*data)++) = ASN1_INDEFINITE_LENGTH;
+		(*data_len)--;
+		return 0;
+	}
+
+	if (len <= 0x7f) {
+		*((*data)++) = len;
+		(*data_len)--;
+		return 0;
+	}
+
+	if (*data_len < 2)
+		return -EINVAL;
+
+	if (len <= 0xff) {
+		*((*data)++) = 0x81;
+		*((*data)++) = len & 0xff;
+		*data_len -= 2;
+		return 0;
+	}
+
+	if (*data_len < 3)
+		return -EINVAL;
+
+	if (len <= 0xffff) {
+		*((*data)++) = 0x82;
+		*((*data)++) = (len >> 8) & 0xff;
+		*((*data)++) = len & 0xff;
+		*data_len -= 3;
+		return 0;
+	}
+
+	if (WARN(len > 0xffffff, "ASN.1 length can't be > 0xffffff"))
+		return -EINVAL;
+
+	if (*data_len < 4)
+		return -EINVAL;
+	*((*data)++) = 0x83;
+	*((*data)++) = (len >> 16) & 0xff;
+	*((*data)++) = (len >> 8) & 0xff;
+	*((*data)++) = len & 0xff;
+	*data_len -= 4;
+
+	return 0;
+}
+
+/**
+ * asn1_encode_tag() - add a tag for optional or explicit value
+ * @data:	pointer to place tag at
+ * @end_data:	end of data pointer, points one beyond last usable byte in @data
+ * @tag:	tag to be placed
+ * @string:	the data to be tagged
+ * @len:	the length of the data to be tagged
+ *
+ * Note this currently only handles short form tags < 31.  To encode
+ * in place pass a NULL @string and -1 for @len; all this will do is
+ * add an indefinite length tag and update the data pointer to the
+ * place where the tag contents should be placed.  After the data is
+ * placed, repeat the prior statement but now with the known length.
+ * In order to avoid having to keep both before and after pointers,
+ * the repeat expects to be called with @data pointing to where the
+ * first encode placed it.
+ */
+unsigned char *
+asn1_encode_tag(unsigned char *data, const unsigned char *end_data,
+		u32 tag, const unsigned char *string, int len)
+{
+	int data_len = end_data - data;
+	int ret;
+
+	if (WARN(tag > 30, "ASN.1 tag can't be > 30"))
+		return ERR_PTR(-EINVAL);
+
+	if (!string && WARN(len > 127,
+			    "BUG: recode tag is too big (>127)"))
+		return ERR_PTR(-EINVAL);
+
+	if (IS_ERR(data))
+		return data;
+
+	if (!string && len > 0) {
+		/*
+		 * we're recoding, so move back to the start of the
+		 * tag and install a dummy length because the real
+		 * data_len should be NULL
+		 */
+		data -= 2;
+		data_len = 2;
+	}
+
+	if (data_len < 2)
+		return ERR_PTR(-EINVAL);
+
+	*(data++) = _tagn(CONT, CONS, tag);
+	data_len--;
+	ret = asn1_encode_length(&data, &data_len, len);
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	if (!string)
+		return data;
+
+	if (data_len < len)
+		return ERR_PTR(-EINVAL);
+
+	memcpy(data, string, len);
+	data += len;
+
+	return data;
+}
+EXPORT_SYMBOL_GPL(asn1_encode_tag);
+
+/**
+ * asn1_encode_octet_string() - encode an ASN.1 OCTET STRING
+ * @data:	pointer to encode at
+ * @end_data:	end of data pointer, points one beyond last usable byte in @data
+ * @string:	string to be encoded
+ * @len:	length of string
+ *
+ * Note ASN.1 octet strings may contain zeros, so the length is obligatory.
+ */
+unsigned char *
+asn1_encode_octet_string(unsigned char *data,
+			 const unsigned char *end_data,
+			 const unsigned char *string, u32 len)
+{
+	int data_len = end_data - data;
+	int ret;
+
+	if (IS_ERR(data))
+		return data;
+
+	/* need minimum of 2 bytes for tag and length of zero length string */
+	if (data_len < 2)
+		return ERR_PTR(-EINVAL);
+
+	*(data++) = _tag(UNIV, PRIM, OTS);
+	data_len--;
+
+	ret = asn1_encode_length(&data, &data_len, len);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (data_len < len)
+		return ERR_PTR(-EINVAL);
+
+	memcpy(data, string, len);
+	data += len;
+
+	return data;
+}
+EXPORT_SYMBOL_GPL(asn1_encode_octet_string);
+
+/**
+ * asn1_encode_sequence() - wrap a byte stream in an ASN.1 SEQUENCE
+ * @data:	pointer to encode at
+ * @end_data:	end of data pointer, points one beyond last usable byte in @data
+ * @seq:	data to be encoded as a sequence
+ * @len:	length of the data to be encoded as a sequence
+ *
+ * Fill in a sequence.  To encode in place, pass NULL for @seq and -1
+ * for @len; then call again once the length is known (still with NULL
+ * for @seq). In order to avoid having to keep both before and after
+ * pointers, the repeat expects to be called with @data pointing to
+ * where the first encode placed it.
+ */
+unsigned char *
+asn1_encode_sequence(unsigned char *data, const unsigned char *end_data,
+		     const unsigned char *seq, int len)
+{
+	int data_len = end_data - data;
+	int ret;
+
+	if (!seq && WARN(len > 127,
+			 "BUG: recode sequence is too big (>127)"))
+		return ERR_PTR(-EINVAL);
+
+	if (IS_ERR(data))
+		return data;
+
+	if (!seq && len >= 0) {
+		/*
+		 * we're recoding, so move back to the start of the
+		 * sequence and install a dummy length because the
+		 * real length should be NULL
+		 */
+		data -= 2;
+		data_len = 2;
+	}
+
+	if (data_len < 2)
+		return ERR_PTR(-EINVAL);
+
+	*(data++) = _tag(UNIV, CONS, SEQ);
+	data_len--;
+
+	ret = asn1_encode_length(&data, &data_len, len);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (!seq)
+		return data;
+
+	if (data_len < len)
+		return ERR_PTR(-EINVAL);
+
+	memcpy(data, seq, len);
+	data += len;
+
+	return data;
+}
+EXPORT_SYMBOL_GPL(asn1_encode_sequence);
+
+/**
+ * asn1_encode_boolean() - encode a boolean value to ASN.1
+ * @data:	pointer to encode at
+ * @end_data:	end of data pointer, points one beyond last usable byte in @data
+ * @val:	the boolean true/false value
+ */
+unsigned char *
+asn1_encode_boolean(unsigned char *data, const unsigned char *end_data,
+		    bool val)
+{
+	int data_len = end_data - data;
+
+	if (IS_ERR(data))
+		return data;
+
+	/* booleans are 3 bytes: tag, length == 1 and value == 0 or 1 */
+	if (data_len < 3)
+		return ERR_PTR(-EINVAL);
+
+	*(data++) = _tag(UNIV, PRIM, BOOL);
+	data_len--;
+
+	asn1_encode_length(&data, &data_len, 1);
+
+	if (val)
+		*(data++) = 1;
+	else
+		*(data++) = 0;
+
+	return data;
+}
+EXPORT_SYMBOL_GPL(asn1_encode_boolean);
-- 
2.16.4


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH v8 1/8] lib: add ASN.1 encoder
  2020-03-10  5:09 ` [PATCH v8 1/8] lib: add ASN.1 encoder James Bottomley
@ 2020-03-10 15:22   ` James Bottomley
  0 siblings, 0 replies; 4+ messages in thread
From: James Bottomley @ 2020-03-10 15:22 UTC (permalink / raw)
  To: linux-integrity; +Cc: Mimi Zohar, Jarkko Sakkinen, David Woodhouse, keyrings

On Mon, 2020-03-09 at 22:09 -0700, James Bottomley wrote:
> We have a need in the TPM2 trusted keys to return the ASN.1 form of
> the TPM key blob so it can be operated on by tools outside of the
> kernel.  The specific tools are the openssl_tpm2_engine, openconnect
> and the Intel tpm2-tss-engine.  To do that, we have to be able to
> read and write the same binary key format the tools use.  The current
> ASN.1 decoder does fine for reading, but we need pieces of an ASN.1
> encoder to write the key blob in binary compatible form.
> 
> For backwards compatibility, the trusted key reader code will still
> accept the two TPM2B quantities that it uses today, but the writer
> will only output the ASN.1 form.
> 
> The current implementation only encodes the ASN.1 bits we actually
> need.
> 
> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com
> >

Sorry, screwed up on tags here (forgot to add reviewed-by:).  I've
resent the entire patch set here:

https://lore.kernel.org/linux-integrity/20200310051607.30334-1-James.Bottomley@HansenPartnership.com/

James


^ permalink raw reply	[flat|nested] 4+ messages in thread

* [PATCH v8 0/8] TPM 2.0 trusted keys with attached policy
@ 2020-03-10  5:15 James Bottomley
  0 siblings, 0 replies; 4+ messages in thread
From: James Bottomley @ 2020-03-10  5:15 UTC (permalink / raw)
  To: linux-integrity; +Cc: Mimi Zohar, Jarkko Sakkinen, David Woodhouse, keyrings

This is a respin to separate patch 4 into the original three patches
it was.  I've done testing with each of the three splinters, so I
think I've got the split correct.

General cover letter:

This patch updates the trusted key code to export keys in the ASN.1
format used by current TPM key tools (openssl_tpm2_engine and
openconnect).  It also simplifies the use of policy with keys because
the ASN.1 format is designed to carry a description of how to
construct the policy, with the result that simple policies (like
authorization and PCR locking) can now be constructed and used in the
kernel, bringing the TPM 2.0 policy use into line with how TPM 1.2
works.

The key format is designed to be compatible with our two openssl
engine implementations as well as with the format used by openconnect.
I've added seal/unseal to my engine so I can use it for
interoperability testing and I'll later use this for sealed symmetric
keys via engine:

https://git.kernel.org/pub/scm/linux/kernel/git/jejb/openssl_tpm2_engine.git/

James

---

James Bottomley (8):
  lib: add ASN.1 encoder
  oid_registry: Add TCG defined OIDS for TPM keys
  security: keys: trusted: fix TPM2 authorizations
  security: keys: trusted: use ASN.1 TPM2 key format for the blobs
  security: keys: trusted: Make sealed key properly interoperable
  security: keys: trusted: add PCR policy to TPM2 keys
  security: keys: trusted: add ability to specify arbitrary policy
  security: keys: trusted: implement counter/timer policy

 Documentation/security/keys/trusted-encrypted.rst |  64 ++-
 include/keys/trusted-type.h                       |   7 +-
 include/linux/asn1_encoder.h                      |  32 ++
 include/linux/oid_registry.h                      |   5 +
 include/linux/tpm.h                               |   8 +
 lib/Makefile                                      |   2 +-
 lib/asn1_encoder.c                                | 431 ++++++++++++++++++++
 security/keys/Kconfig                             |   2 +
 security/keys/trusted-keys/Makefile               |   2 +-
 security/keys/trusted-keys/tpm2-policy.c          | 463 ++++++++++++++++++++++
 security/keys/trusted-keys/tpm2-policy.h          |  31 ++
 security/keys/trusted-keys/tpm2key.asn1           |  23 ++
 security/keys/trusted-keys/trusted_tpm1.c         |  56 ++-
 security/keys/trusted-keys/trusted_tpm2.c         | 370 +++++++++++++++--
 14 files changed, 1459 insertions(+), 37 deletions(-)
 create mode 100644 include/linux/asn1_encoder.h
 create mode 100644 lib/asn1_encoder.c
 create mode 100644 security/keys/trusted-keys/tpm2-policy.c
 create mode 100644 security/keys/trusted-keys/tpm2-policy.h
 create mode 100644 security/keys/trusted-keys/tpm2key.asn1

-- 
2.16.4


^ permalink raw reply	[flat|nested] 4+ messages in thread

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Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-10  5:09 [PATCH v8 0/8] TPM 2.0 trusted keys with attached policy James Bottomley
2020-03-10  5:09 ` [PATCH v8 1/8] lib: add ASN.1 encoder James Bottomley
2020-03-10 15:22   ` James Bottomley
2020-03-10  5:15 [PATCH v8 0/8] TPM 2.0 trusted keys with attached policy James Bottomley

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