Merge pull request #468 from trail-of-forks/ww/pyca-2025-01

engagements: add PyCA

alpha/engagements/2025/PyCA/README.md

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+# Alpha Engagement: PyCA Cryptography Declarative ASN.1 API
+
+The purpose of this Alpha engagement is to fund the development of
+a declarative ASN.1 API for [PyCA Cryptography](https://cryptography.io/),
+the de facto standard cryptography library for Python.
+
+This API will allow developers to declare ASN.1 structures as Python
+classes and perform DER serialization/deserialization against them. The
+internals of this API will be developed against
+[rust-asn1](https://github.com/alex/rust-asn1), which already underlies
+PyCA Cryptography's internal use of ASN.1 and DER.
+
+## Timeline
+
+This engagement started in January 2025.
+
+## Monthly updates
+
+* [January 2025](./update-2025-01.md)
+
+## Primary Contacts
+
+* William Woodruff - Trail of Bits

alpha/engagements/2025/PyCA/update-2025-01.md

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+# PyCA Cryptography Declarative ASN.1 API
+
+*Logistical note*: This is our first status update, and reflects
+only a limited number of hours used this month.
+
+## In progress
+
+* Began design and initial development on the Python components of the
+  declarative ASN.1, including a `dataclasses`-style public API,
+  `typing.Annotated` support, and an intermediate representation suitable
+  for use within the Rust components.
+