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* configure.ac (AC_CHECK_HEADERS): Add tss2/tss.h.
* agent/divert-tpm2.c: Print an error if that file is not available.
* agent/Makefile.am (gpg_agent_SOURCES): Add tpm.h
* agent/command.c (do_one_keyinfo): Replace xstrdup by xtrystrdup.
* agent/protect.c (agent_get_shadow_info_type): Check error of
xtrystrdup.
Signed-off-by: Werner Koch <[email protected]>
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* agent/divert-tpm2.c: Support ECC.
--
This adds handling for the way gnupg does elliptic keys, namely ECDSA
for signatures and using ECDH with an ephemeral key to generate an
encrypted message. The main problem is that the TPM2 usually has a
very small list of built in curves and it won't handle any others.
Thanks to TCG mandates, all TPM2 systems in the USA should come with
NIST P-256, but do not come with the Bernstien curve 25519, so the
only way to use the TPM2 to protect an elliptic curve key is first to
create it with a compatible algorithm.
Signed-off-by: James Bottomley <[email protected]>
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* agent/divert-tpm2.c: New.
* Makefile.am (gpg_agent_SOURCES): Add it.
* agent/command.c (do_one_keyinfo): Fake serialno for TPM.
(cmd_keytotpm): New.
(register_commands): Register KEYTOTPM command.
* agent/pkdecrypt.c (agent_pkdecrypt): Divert to TPM.
* agent/pksign.c (agent_pksign_do): Divert to TPM.
--
This code installs diversions for pksign and pkdecrypt to do the
operations via the TPM if a TPM shadowed key is present. It also adds
an extra assuan command KEYTOTPM which moves an existing private key
to a TPM shadowed key.
The way TPM shadowing works is that the public and private key parts
are fed in to the TPM command TPM2_Import. The output of this command
is a TPM specific public and private key data where the private key
data is symmetrically encrypted using a TPM internal key. If this
physical TPM is ever lost or cleared, that TPM internal key will
likewise be lost and nothing will ever be able to read the private
key. Once the import is done, the shadow information for the key is
updated to be a three part list consisting of the parent key (hard
coded to 81000001 which is the Microsoft preferred RSA incarnation of
the storage seed) and the public and private TPM data blobs.
Now when a TPM shadowed key is used, the data blobs must be loaded
into the TPM with TPM2_Load before any operation can be performed.
Signed-off-by: James Bottomley <[email protected]>
- Added ChangeLog entries
Signed-off-by: Werner Koch <[email protected]>
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