Add DHKEM(P-256, HKDF-SHA256) support to HPKE implementation#14398
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Add DHKEM(P-256, HKDF-SHA256) support to HPKE implementation#14398
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Add P256 KEM variant alongside the existing X25519, following the same abstraction patterns used for KDF and AEAD. KEM-specific operations (key generation, public key serialization/deserialization, DH exchange) are methods on the KEM enum, keeping encap/decap unified with no duplication. Includes key type validation against Python ABCs (TypeError on mismatch), RFC 9180 test vector validation for kem_id=0x0010, and comprehensive wrong-key/wrong-type/wrong-curve tests. https://claude.ai/code/session_01FJG426sLhnaeMytWntj9aJ
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Add P256 KEM variant alongside the existing X25519, following the same abstraction patterns used for KDF and AEAD. KEM-specific operations (key generation, public key serialization/deserialization, DH exchange) are methods on the KEM enum, keeping encap/decap unified with no duplication.
Includes key type validation against Python ABCs (TypeError on mismatch), RFC 9180 test vector validation for kem_id=0x0010, and comprehensive wrong-key/wrong-type/wrong-curve tests.
https://claude.ai/code/session_01FJG426sLhnaeMytWntj9aJ