Add support for Circl's signature schemes #1123
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This PR adds support for the signature schemes from Cloudflare's Circl library, such as the hybrid scheme Ed25519-Dilithium3. This is preparation to set up a secondary experimental post-quantum secure CA within Cloudflare. (See Jira ticket RTG-49 for internal context.)
cfssl relies on Go's internal
crypto/x509
, which makes it impossible to add new signature schemes which are not supported by Go itself. Thus we have created a fork of Go that adds support for the signature schemes in Circl tocrypto/x509
andcrypto/tls
. If cfssl is built with vanilla Go, then nothing changes. If cfssl is built using our Go fork, then it will include support for the additional signature schemes. (This is controlled by thecfgo
build-tag.)This PR does not yet update cfscan as it does not support TLS 1.3 (yet). We'll add that later.