52 lines
2.1 KiB
Markdown
52 lines
2.1 KiB
Markdown
# Occlum Remote Attestation
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Occlum provides wrapped library `libocclum_dcap` for `DCAP` remote attestion applications.
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This Occlum DCAP library is prebuilt as part of the Occlum toolchains in the [Occlum Docker images](https://hub.docker.com/r/occlum/occlum).
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The libraries are in the path `/opt/occlum/toolchains/dcap_lib`.
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```
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.
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|-- glibc
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| |-- dcap_test
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| |-- libocclum_dcap.a
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| `-- libocclum_dcap.so
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|-- inc
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| `-- occlum_dcap.h
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`-- musl
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|-- dcap_test
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|-- libocclum_dcap.a
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`-- libocclum_dcap.so
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```
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Two versions (glibc and musl-libc), including static and dynamic libraries are provided to meet different scenarios. Unified header file `occlum_dcap.h` is provided as well in which defines the exported APIs for DCAP quote generation and verification.
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In short, applications can link to the prebuilt `libocclum_dcap.so` and use the APIs defined in `occlum_dcap.h` for their usage.
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For details how to use the library, please refer to the [`demo`](../demos/remote_attestation/dcap/).
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The source code of the library is in the [`path`](../tools/toolchains/dcap_lib/).
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## SGX KSS (Key Separation and Sharing feature) support
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Starting from SGX2, there is a new Key Separation and Sharing feature which provides more flexibility. The new feature gives user a chance to fill in some meaningful information to the enclave either in the signing or running stage.
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* Signning stage:
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```
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ISVFAMILYID, 16 bytes
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ISVEXTPRODID, 16 bytes
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```
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* Running stage:
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```
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CONFIG ID, 64 bytes
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CONFIG SVN, 16 bits
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```
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Occlum can support both above by either modifying the fields in `Occlum.json` (for `Signning stage`) or using Occlum run arguments `"--config-id"` or `"--config-svn"` (for `Running stage`).
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Details please refer to the [RFC](https://github.com/occlum/occlum/issues/589).
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## References
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- [DCAP Quick Install Guide](https://software.intel.com/content/www/us/en/develop/articles/intel-software-guard-extensions-data-center-attestation-primitives-quick-install-guide.html)
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- [Intel(R) Software Guard Extensions Data Center Attestation Primitives](https://github.com/intel/SGXDataCenterAttestationPrimitives) |