Poly1305 is available whenever AWS-LC is backing#14849
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AWS-LC supports Poly1305 in FIPS mode. The Rust backend already handles this correctly — when compiled with CRYPTOGRAPHY_IS_AWSLC, the Poly1305Boring path is used which has no FIPS gate. Align the Python-side poly1305_supported() method with the actual behavior.
alex
approved these changes
May 12, 2026
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Poly1305 is always available when AWS-LC is the backend, regardless of FIPS mode. The Rust backend already handles this correctly - when compiled with CRYPTOGRAPHY_IS_AWSLC, the Poly1305Boring path is used which has no FIPS gate. However, the Python-side poly1305_supported() unconditionally returns False when FIPS is enabled, causing tests to be skipped and the algorithm to appear unsupported.
This aligns the Python backend method with the actual Rust/C behavior.