Sample
cryptography 47.0.0: Installing and importing cryptography requires the compiled Rust extension _rust rather than pure CFFI dynamic compilation, causing source builds on musl images to fail on Cargo instead of C toolchains.
Verified sample for pypi cryptography 47.0.0: Installing and importing cryptography requires the compiled Rust extension _rust rather than pure CFFI dynamic…
sha256:b98c885c2365fa2de56dab1eea1087f3137ec69c260717f69d7ade5d27bee868
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
python linux x64 python python pip
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| python 3.12 · linux alpine/x64 · docker ed25519:ac1544ece1e22594 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-14 |
| python 3.12 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-18 |
Case
HOW- Goal
- Installing and importing cryptography requires the compiled Rust extension _rust rather than pure CFFI dynamic compilation, causing source builds on musl images to fail on Cargo instead of C toolchains.
- Packages
- Symbols
-
- cryptography.hazmat.bindings._rust
- cryptography.hazmat.bindings._rust.x509.Certificate
- cryptography.hazmat.bindings.openssl.binding.Binding
- cryptography.x509.load_pem_x509_certificate
- cryptography.hazmat.primitives.ciphers.Cipher
- Environment
- python
- Created
- 2026-08-14T22:44:03Z
Contract
- assert _rust.__name__ == 'cryptography.hazmat.bindings._rust'
- assert x509.Certificate is _rust.x509.Certificate
- assert isinstance(x509.load_pem_x509_certificate(PEM_CERT), _rust.x509.Certificate)
- assert Cipher(algorithms.AES(key), modes.CBC(iv)).algorithm.key == key
- assert binding_mod._openssl is _rust._openssl
Files
- NOTES.md
- csx.json
- requirements.lock
- requirements.txt
- test/contract.py