u-boot FIT image signing in dtb
Creating a dtb to attach to u-boot that has public keys to verify a signed FIT image is a 2 step process:
1) dtc u-boot_pubkey.dts -O dtb -o u-boot_pubkey.dtb
2) tools/mkimage -f fitImage.its -K u-boot_pubkey.dtb -k /path/to/keys -r fitImage
After each step the u-boot_pubkey.dtb grows in size.
Why is this the case? Can't the public keys be embedded in the dtb before signing the FIT image? This makes me think the dtb is not reuseable the next time a FIT image is signed.
The above steps were taken from https://elinux.org/images/e/e0/Josserand-schulz-secure-boot.pdf
and do indeed work
Any insight would be helpful.
linux openssl u-boot
asked 16 mins ago
Rich OGradyRich OGrady
1
New contributor
Rich OGrady is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
Creating a dtb to attach to u-boot that has public keys to verify a signed FIT image is a 2 step process:
1) dtc u-boot_pubkey.dts -O dtb -o u-boot_pubkey.dtb
2) tools/mkimage -f fitImage.its -K u-boot_pubkey.dtb -k /path/to/keys -r fitImage
After each step the u-boot_pubkey.dtb grows in size.
Why is this the case? Can't the public keys be embedded in the dtb before signing the FIT image? This makes me think the dtb is not reuseable the next time a FIT image is signed.
The above steps were taken from https://elinux.org/images/e/e0/Josserand-schulz-secure-boot.pdf
and do indeed work
Any insight would be helpful.
linux openssl u-boot
asked 16 mins ago
Rich OGradyRich OGrady
1
New contributor
Rich OGrady is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
Creating a dtb to attach to u-boot that has public keys to verify a signed FIT image is a 2 step process:
1) dtc u-boot_pubkey.dts -O dtb -o u-boot_pubkey.dtb
2) tools/mkimage -f fitImage.its -K u-boot_pubkey.dtb -k /path/to/keys -r fitImage
After each step the u-boot_pubkey.dtb grows in size.
Why is this the case? Can't the public keys be embedded in the dtb before signing the FIT image? This makes me think the dtb is not reuseable the next time a FIT image is signed.
The above steps were taken from https://elinux.org/images/e/e0/Josserand-schulz-secure-boot.pdf
and do indeed work
Any insight would be helpful.
linux openssl u-boot
asked 16 mins ago
Rich OGradyRich OGrady
1
New contributor
Rich OGrady is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Creating a dtb to attach to u-boot that has public keys to verify a signed FIT image is a 2 step process:
1) dtc u-boot_pubkey.dts -O dtb -o u-boot_pubkey.dtb
2) tools/mkimage -f fitImage.its -K u-boot_pubkey.dtb -k /path/to/keys -r fitImage
After each step the u-boot_pubkey.dtb grows in size.
Why is this the case? Can't the public keys be embedded in the dtb before signing the FIT image? This makes me think the dtb is not reuseable the next time a FIT image is signed.
The above steps were taken from https://elinux.org/images/e/e0/Josserand-schulz-secure-boot.pdf
and do indeed work
Any insight would be helpful.
linux openssl u-boot
linux openssl u-boot
asked 16 mins ago
Rich OGradyRich OGrady
1
New contributor
Rich OGrady is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 16 mins ago
Rich OGradyRich OGrady
1
New contributor
Rich OGrady is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 16 mins ago
Rich OGradyRich OGrady
1
New contributor
Rich OGrady is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 16 mins ago
Rich OGradyRich OGrady
1
asked 16 mins ago
Rich OGradyRich OGrady
1
1
New contributor
Rich OGrady is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Rich OGrady is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Rich OGrady is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Rich OGrady is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f507324%2fu-boot-fit-image-signing-in-dtb%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Rich OGrady is a new contributor. Be nice, and check out our Code of Conduct.
Rich OGrady is a new contributor. Be nice, and check out our Code of Conduct.
Rich OGrady is a new contributor. Be nice, and check out our Code of Conduct.
Rich OGrady is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f507324%2fu-boot-fit-image-signing-in-dtb%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
