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CompositeMLDsa updated to draft-08

CompositeMLDsa has moved from draft-07 to draft-08 of the Composite ML-DSA for use in X.509 Public Key Infrastructure specification. The draft-08 format is not compatible with the draft-07 signatures, and key export/import formats are also incompatible across the draft-07/draft-08 boundary. draft-08 and draft-09 are compatible.

Version introduced

.NET 10 GA

Previous behavior

In preview and RC releases of .NET 10, signatures were generated and validated according to draft-07 of Composite ML-DSA for use in X.509 Public Key Infrastructure.

Public key and private key export and import used the format from draft-07 of Composite ML-DSA for use in X.509 Public Key Infrastructure.

New behavior

Starting in the .NET 10 GA release, signatures are generated and validated according to draft-08 of Composite ML-DSA for use in X.509 Public Key Infrastructure.

Public key and private key export and import use the format from draft-08 of Composite ML-DSA for use in X.509 Public Key Infrastructure.

Type of breaking change

This change is a behavioral change.

Reason for change

This change was made to stay current with the underlying specification.

The CompositeMLDsa class is marked as [Experimental], partly because the specification isn't yet complete. Do not depend on this class in production.

Discard any previously generated keys and signatures.

Affected APIs

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