dpe: Resolve feedback items from #66 #88
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Fixes opencomputeproject#86 * Adds maximum certificate size for ML-DSA * Adds a remaining field to GetCertificateChain to fix the corner case where GetCertificateChainResponse.size == the size of the certificate * Adds detail about ML-DSA private key derivation Signed-off-by: Zach Halvorsen <zhalvorsen@google.com>
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jhand2
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Dec 18, 2025
zhalvorsen
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Jan 5, 2026
| | 0x08 | `U32` | 31:0 | `PROFILE` | One of `DPE_PROFILE_*`. | ||
| | 0x0C | `U32` | 31:0 | `CERTIFICATE_SIZE` | Number of bytes used in `CERTIFICATE_CHAIN`. Can be smaller than requested if no bytes are left to read. | ||
| | 0x10 | `BYTES` | 16383:0 | `CERTIFICATE_CHAIN` | Returned certificate chain. This may be a partial certificate chain. | ||
| | 0x0C | `U32` | 31:0 | `REMAINING` | Number of bytes remaining after this portion of the certificate chain. |
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@jhand2 Instead of changing this ABI, what if we added a return status that was "There is still more data"?
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Oh, ya I think that's how it works today: https://github.com/chipsalliance/caliptra-dpe/blob/main/verification/client/abi.go#L548-L551
Although in retrospect, InvalidArgument was probably a bad return code to choose :)
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Fixes #86
GetCertificateChainResponse.size == the size of the certificate