Initial QSfera import

Server/vendor/github.com/lestrrat-go/dsig-secp256k1/.gitignore

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+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Code coverage profiles and other test artifacts
+*.out
+coverage.*
+*.coverprofile
+profile.cov
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+go.work.sum
+
+# env file
+.env
+
+# Editor/IDE
+# .idea/
+# .vscode/

Server/vendor/github.com/lestrrat-go/dsig-secp256k1/Changes

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+Changes
+=======
+
+v1.0.0 18 Aug 2025
+* Initial release

Server/vendor/github.com/lestrrat-go/dsig-secp256k1/LICENSE

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+MIT License
+
+Copyright (c) 2025 lestrrat-go
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Server/vendor/github.com/lestrrat-go/dsig-secp256k1/secp256k1.go

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+package dsigsecp256k1
+
+import (
+	"crypto"
+
+	"github.com/decred/dcrd/dcrec/secp256k1/v4"
+	"github.com/lestrrat-go/dsig"
+)
+
+const ECDSAWithSecp256k1AndSHA256 = "ECDSA_WITH_SECP256K1_AND_SHA256"
+
+// init adds secp256k1 support when the dsig_secp256k1 build tag is used.
+func init() {
+	// Register ES256K (secp256k1 + SHA256) support using the new API
+	err := dsig.RegisterAlgorithm(ECDSAWithSecp256k1AndSHA256, dsig.AlgorithmInfo{
+		Family: dsig.ECDSA,
+		Meta: dsig.ECDSAFamilyMeta{
+			Hash: crypto.SHA256,
+		},
+	})
+	if err != nil {
+		panic("failed to register secp256k1 algorithm: " + err.Error())
+	}
+}
+
+// secp256k1Curve returns the secp256k1 curve.
+func Curve() *secp256k1.KoblitzCurve {
+	return secp256k1.S256()
+}