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Add support for x86_64-fortanix-unknown-sgx target #738

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Add support for x86_64-fortanix-unknown-sgx target #738

wants to merge 5 commits into from

Commits on Feb 7, 2019

  1. Implement entropy source for SGX 

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at the top of each file I changed.

Co-authored-by: Akash Anand <akash.anand@fortanix.com>
    @akash-fortanix
    Jethro Beekman and akash-fortanix committed Feb 7, 2019
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  2. Disable AES/GCM Fallback implementations on SGX 

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    Jethro Beekman committed Feb 7, 2019
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  3. Optionally use std::is_x86_feature_detected for feature detection 

    Audit of all CPUID features use by *ring* at the time of the commit:

|              | chacha | aesni | mont5 | mont | ghash | sha512 | poly1305 | Rust |
|--------------|--------|-------|-------|------|-------|--------|----------|------|
| ADX          |        |       | *     | *    |       |        |          |      |
| AES          |        |       |       |      |       |        |          | *    |
| AVX          |        | *     |       |      |       | *      | *        | *    |
| AVX2         | *      |       |       | *    |       | *      | *        |      |
| AVX512F      | *      |       |       |      |       |        |          |      |
| BMI1         |        |       | *     |      |       | *      |          |      |
| BMI2         |        |       | *     | *    |       | *      |          |      |
| FXSR         |        |       |       |      |       |        |          | 5    |
| “intel CPU”  |        |       |       |      |       | *      |          |      |
| MOVBE        | 1,2    | *     |       |      | 1,3   |        |          | 6    |
| PCLMULQDQ    |        |       |       |      |       |        |          | *    |
| SHA          |        |       |       |      |       | *      |          |      |
| SSSE3        | *      |       |       |      |       | *      |          | *    |
| XOP          |        | 4     |       |      |       |        |          |      |
| XSAVE        | 1      | 1     |       |      | 1     |        |          |      |

1. Instruction not used, only used to detect Atom processors
2. If Atom, change the input lengths for which different code paths are taken (presumably for performance)
3. If Atom, avoid one code path for performance
4. Instruction not used
5. Instruction not used, only used to detect PCLMULQDQ
6. Instruction not used, only used to detect AVX

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at the top of each file I changed.
    Jethro Beekman committed Feb 7, 2019
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  4. Add x86_64-fortanix-unknown-sgx to CI 

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at the top of each file I changed.
    Jethro Beekman committed Feb 7, 2019
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  5. Add SGX-specific notes to the documentation 

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    Jethro Beekman committed Feb 7, 2019
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