{"id":13775597,"url":"https://github.com/chipsalliance/caliptra","last_synced_at":"2026-01-27T01:31:59.371Z","repository":{"id":81269355,"uuid":"598728727","full_name":"chipsalliance/Caliptra","owner":"chipsalliance","description":"Caliptra IP and firmware for integrated Root of Trust block","archived":false,"fork":false,"pushed_at":"2026-01-15T21:36:18.000Z","size":25278,"stargazers_count":368,"open_issues_count":71,"forks_count":55,"subscribers_count":46,"default_branch":"main","last_synced_at":"2026-01-16T00:07:05.979Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":null,"language":null,"has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"apache-2.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/chipsalliance.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":"CONTRIBUTING.md","funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":"CODEOWNERS","security":"SECURITY.md","support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null,"notice":null,"maintainers":"MAINTAINERS.md","copyright":null,"agents":null,"dco":null,"cla":null}},"created_at":"2023-02-07T17:37:53.000Z","updated_at":"2026-01-15T21:16:02.000Z","dependencies_parsed_at":"2024-09-06T04:37:08.958Z","dependency_job_id":"958127b9-e7b9-43d4-adc2-5d1e9fa9c936","html_url":"https://github.com/chipsalliance/Caliptra","commit_stats":null,"previous_names":[],"tags_count":1,"template":false,"template_full_name":null,"purl":"pkg:github/chipsalliance/Caliptra","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/chipsalliance%2FCaliptra","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/chipsalliance%2FCaliptra/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/chipsalliance%2FCaliptra/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/chipsalliance%2FCaliptra/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/chipsalliance","download_url":"https://codeload.github.com/chipsalliance/Caliptra/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/chipsalliance%2FCaliptra/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":28795468,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-01-27T01:07:07.743Z","status":"ssl_error","status_checked_at":"2026-01-27T01:07:06.974Z","response_time":59,"last_error":"SSL_read: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-08-03T17:01:42.236Z","updated_at":"2026-01-27T01:31:59.365Z","avatar_url":"https://github.com/chipsalliance.png","language":null,"funding_links":[],"categories":["Systems"],"sub_categories":[],"readme":"![Caliptra Logo](https://chipsalliance.github.io/Caliptra/doc/images/logo/Caliptra_logo_large.png)\n\n# Caliptra\n\nCaliptra consists of IP and firmware for an integrated Root of Trust block.\n\nCaliptra targets datacenter-class SoCs like CPUs, GPUs, DPUs, TPUs. It is the\nspecification, silicon logic, ROM and firmware for implementing a Root of Trust\nfor Measurement (RTM) block inside an SoC. A Caliptra integration provides the\nSoC with Identity, Measured Boot and Attestation capabilities.\n\n## Organizations\n\nCaliptra is a project originally incepted at the Open Compute Project\n([OCP](https://www.opencompute.org/)).  The major revisions of the Caliptra\nspecifications are published at OCP. The evolving source code and documentation\nfor Caliptra live in this repository within the [CHIPS Alliance\nProject](https://chipsalliance.org/), a Series of LF Projects, LLC.\n\n## Governance\n\nThe [Caliptra WorkGroup Technical Charter](https://github.com/chipsalliance/Caliptra/blob/main/CaliptraWGTechnicalCharter.md)\nsets out the charter governing the Caliptra project.\n\n## Trademark\n\n* [Caliptra Trademark Policy](https://github.com/chipsalliance/Caliptra/blob/main/CaliptraTrademarkPolicy.md)\n* [Caliptra Trademark Process definition](https://github.com/chipsalliance/Caliptra/blob/main/CaliptraTrademarkAuditProcess.md)\n* [Caliptra Trademark Checklist and Evaluation Methodology](https://github.com/chipsalliance/Caliptra/blob/main/CaliptraChecklistAndEvaluationMethodology.md)\n\n## Specifications\n\n### Caliptra 1.x:\n  * [Main Caliptra specification 1.x](https://github.com/chipsalliance/Caliptra/blob/main/doc/caliptra_1x/Caliptra.md)\n  * [Caliptra Core Hardware Specification](https://github.com/chipsalliance/caliptra-rtl/blob/v1.1/docs/CaliptraHardwareSpecification.md)\n  * [Caliptra Core Hardware Integration\n    Specification](https://github.com/chipsalliance/caliptra-rtl/blob/v1.1/docs/CaliptraIntegrationSpecification.md)\n  * [ROM 1.x](https://github.com/chipsalliance/caliptra-sw/blob/main/rom/dev/README.md)\n  * [FMC](https://github.com/chipsalliance/caliptra-sw/blob/main/fmc/README.md)\n  * [Runtime](https://github.com/chipsalliance/caliptra-sw/blob/main/runtime/README.md)\n\n### Caliptra 2.x:\n  * [Main Caliptra specification 2.0 - Version 1.0](https://github.com/chipsalliance/Caliptra/blob/main/doc/caliptra_20/Caliptra.md)\n  * [Caliptra Core Hardware Specification 2.0.1](https://github.com/chipsalliance/caliptra-rtl/blob/v2.0.1/docs/CaliptraHardwareSpecification.md)\n  * [Caliptra Core Hardware Integration\n    Specification 2.0.1](https://github.com/chipsalliance/caliptra-rtl/blob/v2.0.1/docs/CaliptraIntegrationSpecification.md)\n  * [Caliptra Subsystem Hardware Specification - Version 1.0rc1](https://github.com/chipsalliance/caliptra-ss/blob/main/docs/CaliptraSSHardwareSpecification.md)\n  * [Caliptra Subsystem Integration Specification - Version 1.0rc1](https://github.com/chipsalliance/caliptra-ss/blob/main/docs/CaliptraSSIntegrationSpecification.md)\n  * [ROM 2.x - WIP](https://github.com/chipsalliance/caliptra-sw/blob/main-2.x/rom/dev/README.md)\n  * [FMC 2.x - WIP](https://github.com/chipsalliance/caliptra-sw/blob/main-2.x/fmc/README.md)\n  * [Runtime 2.x - WIP](https://github.com/chipsalliance/caliptra-sw/blob/main-2.x/runtime/README.md)\n  * [MCU Firmware and SDK specification - WIP](https://chipsalliance.github.io/caliptra-mcu-sw/)\n\n## Versioning\n\nCaliptra is released in independently versioned components: RTL, ROM, FMC and Runtime FW. They are all represented by 3 values: major.minor.patch (such as 1.0.2). The first 2 values, major.minor, correspond to a set of features caliptra supports. The patch value is incremented as new releases are made with bug fixes. Lastly, mutable firmware (FMC/FW) have security version numbers (SVNs) that are incremented as required by when addressing security-critical issues. These are specified with the label (svn/svn) for (FMC/FW) versions respectively.\n\nNot all components necessarily need to be of the same major.minor version to be compatible. Details are below:\n\n### Caliptra 1.0\nCompatible Configurations:\n| RTL | ROM | Runtime FMC/FW |\n| --- | --- | --- |\n| 1.0.x | 1.0.x | 1.0.x (0/0) |\n\n### Caliptra 1.1\n\nAdditional Features\n  - ECC HW performance enhancements*\n  - LMS HW acceleration*\n  - New Runtime commands\n    - [LMS_SIGNATURE_VERIFY](https://github.com/chipsalliance/caliptra-sw/blob/caliptra-1.1/runtime/README.md#lms_signature_verify)\n    - [ADD_SUBJECT_ALT_NAME](https://github.com/chipsalliance/caliptra-sw/blob/caliptra-1.1/runtime/README.md#add_subject_alt_name)\n    - [CERTIFY_KEY_EXTENDED](https://github.com/chipsalliance/caliptra-sw/blob/caliptra-1.1/runtime/README.md#certify_key_extended)\n  - Expanded PL0 contexts to 16\n\n\\* Requires 1.1 RTL\n\nCompatible Configurations:\n\n| RTL | ROM | Runtime FMC/FW |\n| --- | --- | --- |\n| 1.1.x | 1.1.x | 1.1.x (0/0) |\n| 1.0.x | 1.0.x | 1.1.x (0/0) |\n\n\n### Caliptra 1.2\n\nAdditional Features\n  - [Manifest-based Authorization](https://github.com/chipsalliance/caliptra-sw/blob/main/auth-manifest/README.md)\n    - [SET_AUTH_MANIFEST](https://github.com/chipsalliance/caliptra-sw/blob/main/runtime/README.md#set_auth_manifest)\n    - [AUTHORIZE_AND_STASH](https://github.com/chipsalliance/caliptra-sw/blob/main/runtime/README.md#authorize_and_stash)\n  - Deferred retrieval of IDEV CSR**\n    - [GET_IDEVID_CSR](https://github.com/chipsalliance/caliptra-sw/blob/main/runtime/README.md#get_idevid_csr)\n  - Self-signed FMC Alias CSR\n    - [GET_FMC_ALIAS_CSR](https://github.com/chipsalliance/caliptra-sw/blob/main/runtime/README.md#get_fmc_alias_csr)\n  - DPE export of CDI\n    - [SIGN_WITH_EXPORTED_ECDSA](https://github.com/chipsalliance/caliptra-sw/blob/main/runtime/README.md#sign_with_exported_ecdsa)\n    - [REVOKE_EXPORTED_CDI_HANDLE](https://github.com/chipsalliance/caliptra-sw/blob/main/runtime/README.md#revoke_exported_cdi_handle)\n  - DPE max cert size increased to 6kB\n\n\\*\\* Requires 1.2 ROM\n\nCompatible Configurations:\n\n| RTL | ROM | Runtime FMC/FW |\n| --- | --- | --- |\n| 1.1.x | 1.2.x | 1.2.x (0/0) |\n| 1.1.x | 1.1.x | 1.2.x (0/0) |\n| 1.0.x | 1.0.x | 1.2.x (0/0) |\n\n### Caliptra 2.0\n\nAdditional Features\n  - Support ML-DSA Caliptra FW Signature\n  - Support OCP Recovery\n  - Support [Caliptra Sub-System](https://github.com/chipsalliance/caliptra-ss/)\n  - IDevID CSR HMAC Signing\n  - Crypto Offload Mailbox Services\n\n\\*\\*\\* Only RTL release versions 2.0.2+ should be used due to ROM compatibility requirements.\n\nCompatible Configurations:\n\n| RTL | ROM | Runtime FMC/FW |\n| --- | --- | --- |\n| 2.0.2+ | 2.0.x | 2.0.x (0/0) |\n\n\n## Test Dashboards\n\n* [Caliptra Software CI dashboard](https://chipsalliance.github.io/caliptra-sw/)\n  -- includes ROM\n* [Caliptra CPU DV coverage\n  dashboard](https://chipsalliance.github.io/Cores-VeeR-EL2/html/main/coverage_dashboard/all/index.html)\n\n## Repositories\n\nThe Caliptra code base and documentation are split across several repositories:\n\n| Repository | Areas of interest | Description |\n| ---------- | ---- | ----------- |\n| [Primary repository](https://github.com/chipsalliance/caliptra)  | [Issues](https://github.com/chipsalliance/caliptra/issues),      [PRs](https://github.com/chipsalliance/caliptra/pulls),      [Security advisories](https://github.com/chipsalliance/caliptra/security/advisories)      | This repository, with admin boilerplate and docs |\n| [Adams Bridge RTL](https://github.com/chipsalliance/adams-bridge)  | [Issues](https://github.com/chipsalliance/adams-bridge/issues),      [PRs](https://github.com/chipsalliance/adams-bridge/pulls),      [Security advisories](https://github.com/chipsalliance/adams-bridge/security/advisories)      | The primary repository with Adams Bridge Post-Quantum Cryptography hardware accelerator |\n| [Caliptra RTL](https://github.com/chipsalliance/caliptra-rtl)     | [Issues](https://github.com/chipsalliance/caliptra-rtl/issues),  [PRs](https://github.com/chipsalliance/caliptra-rtl/pulls),  [Security advisories](https://github.com/chipsalliance/caliptra-rtl/security/advisories), [internal registers](https://chipsalliance.github.io/caliptra-rtl/main/internal-regs/), [external registers](https://chipsalliance.github.io/caliptra-rtl/main/external-regs/)  | The primary repository with immutable RTL |\n| [Caliptra Software 1.x](https://github.com/chipsalliance/caliptra-sw) | [Issues](https://github.com/chipsalliance/caliptra-sw/issues),   [PRs](https://github.com/chipsalliance/caliptra-sw/pulls),   [Security advisories](https://github.com/chipsalliance/caliptra-sw/security/advisories)   | Caliptra software (ROM, FMC, runtime firmware), and libraries/tools needed to build and test |\n| [Caliptra Software 2.x](https://github.com/chipsalliance/caliptra-sw/tree/main-2.x) | [Issues](https://github.com/chipsalliance/caliptra-sw/issues),   [PRs](https://github.com/chipsalliance/caliptra-sw/pulls),   [Security advisories](https://github.com/chipsalliance/caliptra-sw/security/advisories)   | Caliptra software (ROM, FMC, runtime firmware), and libraries/tools needed to build and test |\n| [Caliptra DPE](https://github.com/chipsalliance/caliptra-dpe)     | [Issues](https://github.com/chipsalliance/caliptra-dpe/issues),  [PRs](https://github.com/chipsalliance/caliptra-dpe/pulls),  [Security advisories](https://github.com/chipsalliance/caliptra-dpe/security/advisories)  | An implementation of a TCG DICE Protection Environment profile |\n| [Caliptra U-Reg](https://github.com/chipsalliance/caliptra-ureg)  | [Issues](https://github.com/chipsalliance/caliptra-ureg/issues), [PRs](https://github.com/chipsalliance/caliptra-ureg/pulls), [Security advisories](https://github.com/chipsalliance/caliptra-ureg/security/advisories) | General-purpose libraries and tools for manipulating MMIO registers from Rust |\n| [Caliptra Subsystem](https://github.com/chipsalliance/caliptra-ss)| [Issues](https://github.com/chipsalliance/caliptra-ss/issues), [PRs](https://github.com/chipsalliance/caliptra-ss/pulls), [Security advisories](https://github.com/chipsalliance/caliptra-ss/security/advisories), [registers](https://chipsalliance.github.io/caliptra-ss/main/regs/) | Caliptra Subsystem including Manufacturer Control Unit (MCU) and peripherals |\n| [Caliptra MCU Software](https://github.com/chipsalliance/caliptra-mcu-sw)| [Issues](https://github.com/chipsalliance/caliptra-mcu-sw/issues), [PRs](https://github.com/chipsalliance/caliptra-mcu-sw/pulls), [Security advisories](https://github.com/chipsalliance/caliptra-mcu-sw/security/advisories) | Caliptra MCU Firmware and SDK and specification |\n| [I3C Core](https://github.com/chipsalliance/i3c-core/)            | [Issues](https://github.com/chipsalliance/i3c-core/issues), [PRs](https://github.com/chipsalliance/i3c-core//pulls), [Security advisories](https://github.com/chipsalliance/i3c-core/security/advisories) | I3C target core developed for Caliptra |\n\nThe GitHub config parameters for all of the branches are documented in a [local\nfile](https://github.com/chipsalliance/Caliptra/blob/main/GitHubRules.md).\n\nGitHub branch names for `caliptra-sw` are documented in its [BRANCHING_STRATEGY.md](https://github.com/chipsalliance/caliptra-sw/blob/main-2.x/BRANCHING_STRATEGY.md) document.\n\n### Convenience repository URLs\n\nAll these URLs redirect into the repositories above.\n\n* [repo.caliptra.io](http://repo.caliptra.io)\n* [spec.caliptra.io](http://spec.caliptra.io)\n* [sw.caliptra.io](http://sw.caliptra.io)\n* [fw.caliptra.io](http://fw.caliptra.io)\n* [hw.caliptra.io](http://hw.caliptra.io)\n* [rtl.caliptra.io](http://rtl.caliptra.io)\n* [dpe.caliptra.io](http://dpe.caliptra.io)\n* [ureg.caliptra.io](http://ureg.caliptra.io)\n* [ireg\\[s\\].caliptra.io](http://iregs.caliptra.io)\n* [ereg\\[s\\].caliptra.io](http://eregs.caliptra.io)\n\n## Security policy\n\nFor information on the Caliptra security policy, how to report a vulnerability,\nand published security advisories, refer to\n[Caliptra security policy](https://github.com/chipsalliance/caliptra/security/policy).\n\n## Discussion Channels\n\nThe Caliptra workgroup meets every Thursday at 1pm PT. Meeting invite and agenda\nare posted to the [mailing list](https://lists.chipsalliance.org/g/caliptra-wg).\nThe [call\ninvite](https://teams.microsoft.com/l/meetup-join/19%3ameeting_MmQwYTE4YzQtOWJkMy00YzcyLTgxMDUtYTQ2Zjk2ZjhkMzk5%40thread.v2/0?context=%7b%22Tid%22%3a%2272f988bf-86f1-41af-91ab-2d7cd011db47%22%2c%22Oid%22%3a%22661ec88e-77cb-431c-935a-b377b1078af4%22%7d) is also reachable from the [CHIPS Workgroups\npage](https://www.chipsalliance.org/workgroups/).\n\nA [Slack channel](https://join.slack.com/t/caliptraworkspace/signup)\nis used for interactive discussions. Keep in mind development activity is focused on\nGitHub issues and Pull Request reviews, rarely on the Slack channel. If you have\nissues joining please contact the mailing list.\n\nPlease sign the [CHIPS CLA](https://github.com/chipsalliance/tsc/tree/main/cla)\n(as an individual or your\n[company](https://github.com/chipsalliance/tsc/blob/main/cla/CLA-status.yml) if\naffiliated) before participating in these channels.\n\n## License\n\nAll code written for Caliptra and found in these repositories is licensed under\nthe [Apache Source License 2.0](https://github.com/chipsalliance/Caliptra/blob/main/LICENSE). You can find out more by reading our\ndocument on [how to contribute](https://github.com/chipsalliance/Caliptra/blob/main/CONTRIBUTING.md).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fchipsalliance%2Fcaliptra","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fchipsalliance%2Fcaliptra","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fchipsalliance%2Fcaliptra/lists"}