This commit fixes a bug with the getpriv command using
ECDSA keys.
Signed-off-by: Roland Mikhel <roland.mikhel@arm.com>
Change-Id: I66c1365a855e97199921ac136a18e26988bce508
Update imgtool to support the new
generic ECDSA TLV and the ECDSA
p384 curve type with sha-384
Signed-off-by: Roland Mikhel <roland.mikhel@arm.com>
Change-Id: I9b1887610cc5d0e7cde90f47999fcdf3500ef51c
Verify mode already works for the public halves of RSA and ECDSA keypairs.
This patch corrects an apparent oversight, enabling that functionality
in Ed25519.
Signed-off-by: Ross Younger <crazyscot@gmail.com>
A previous change was added to allow the `getpriv` command to dump ec256
keys in both openssl and pkcs8. That PR did not touch other key file
types which resulted in errors using that command with RSA, X25519, etc.
This commit generalizes the passing of the `format` parameter, so each
key type can decide which format it allows a dump to be produced in,
and what default to use.
Fixes#1529
Signed-off-by: Fabio Utzig <utzig@apache.org>
Fix the remaining PEP8 warnings that appear on image.py, ecdsa.py
or main.py for imgtool.
Signed-off-by: Antonio de Angelis <Antonio.deAngelis@arm.com>
This patch improves the existing ECDSA key generation feature
in the imgtool by:
- Fix a bug in the 'minimal' representation of PKCS#8 keys where
the resulting ASN.1 DER encoding is not compliant
- Add the option to export ECDSA private keys in SEC1 format by
providing a command line option -f or --format that can be
'openssl' (for SEC1 format) or 'pkcs8'. This format ends up in
key encodings which are generally smaller than PKCS#8.
Signed-off-by: Antonio de Angelis <Antonio.deAngelis@arm.com>
Update `getpub` with new `lang` option, "pem", which allows exporting a
public key as a PEM file. This can later be distributed to be used for
encrypting an image, and gets away with having to use openssl for this
step.
Signed-off-by: Fabio Utzig <utzig@apache.org>
According to clippy, `&'static` can just be `&` for static definitions,
which always have a static lifetime. Clean this up in the arrays in the
code, as well as generation code in imgtool.
Signed-off-by: David Brown <david.brown@linaro.org>
Add SPDX headers indicating the Apache-2.0 license to the scripts in the
scripts directory. This can be assumed due to the presence of the
Apache-2.0 LICENSE file at the top of the project.
Fixes#930
Signed-off-by: David Brown <david.brown@linaro.org>
Since commit:
commit a36082664e
Author: David Brown <david.brown@linaro.org>
Date: Thu Dec 12 15:35:31 2019 -0700
ecdsa: Allow ECDSA signatures to be actual length
MCUboot no longer requires ECDSA signatures to be padded to a fixed
length. This change makes imgtool, by default, also no longer add this
padding to images. There is an option `--pad-sig` that can be given to
the sign command to re-instate this padding. This flag will be needed
to make images that will work with older (pre 1.5.0) versions of
MCUboot.
Signed-off-by: David Brown <david.brown@linaro.org>
This applies a few improvements to a commit previously included in
PR #596:
* Move functions to dump a private key to the private key classes
* Remove language option; always dumps in C format
* Add option to generate a minimal dump. This will remove extra
parameters that are present in keys generated with the `keygen`
command.
For P256 this will remove the public point, which is already
ignored by the parsing function. The resulting key dump shrinks
from 138 to 70 bytes.
For RSA it will remove the DP/DQ/QP parameters which are only
used with CRT enabled, and if not available, can be calculated at
runtime. This reduces the size of a key dump from around 1190
bytes to somewhere close to 800 bytes. A patch to the RSA parsing
routine will be added in another commit.
Signed-off-by: Fabio Utzig <utzig@apache.org>
Signed-off-by: Ioannis Konstantelias <ikonstadel@gmail.com>
This adds ed25519 signature support using the "prehash" method. Instead
of using the direct contents of the image and header payloads, a sha256
is generated and signed (SHA256-Ed25519). This allows for compatibility
with already existing tools that use the sha256 hash, like mcumgr, etc.
Signed-off-by: Fabio Utzig <utzig@apache.org>
imgtool verify -k <some-key.(pub|sec)> <img-file>
Allow imgtool to validate that an image has a valid sha256sum and that
it was signed by the supplied key.
NOTE: this does not yet support verifying encrypted images
Signed-off-by: Fabio Utzig <utzig@apache.org>
Until we fix the padding problem, pad the ecdsa signatures with zeros to
always be 72 bytes long. Add a 'raw_sign' method so that the unit test
can use the real signature.
Signed-off-by: David Brown <david.brown@linaro.org>
Replace the (now broken) ECDSA code with code using the python
'cryptography' library.
Similar to the change to RSA, this changes the format that private keys
are stored, again using PKCS#8. This supports the stronger password
protection as well.
Again, this code will still support reading the older style of public
keys, but other tools that use keys generated by this change will need
to be updated to work with the new format.
Signed-off-by: David Brown <david.brown@linaro.org>
The verification code requires a fixed 32-byte salt, which seems is what
the old crypto library did. Use this same value to avoid having to
modify the code.
Signed-off-by: David Brown <david.brown@linaro.org>
The keygen command allows the `-p` argument which will prompt for a
password, and protect the private key with this password. When loading
keys, it will prompt for a password if it detects a password protected
key.
Signed-off-by: David Brown <david.brown@linaro.org>
Replace RSA code with one using the python 'cryptography' library. This
library is much more complete, and will make adding support for password
protected keys, and separate public keys easier.
There is, however, a significant change brought about by this change:
the private keys are stored in PKCS#8 format, instead of the raw format
that was used previously. This is a more modern format that has a few
advantages, including: supporting stronger password protection, and
allowing the key type to be determined upon read.
This tool will still support reading the old style public keys, but
other tools that use these keys will need to be updated in order to work
with the new format.
This new code has some unit tests to go along with it for some basic
sanity testing of the code.
Signed-off-by: David Brown <david.brown@linaro.org>
Roland Mikhel