1 files changed, 22 insertions, 0 deletions
diff --git a/internal/mocks/signer/signer.go b/internal/mocks/signer/signer.go
new file mode 100644
index 0000000..a4ec30d
--- /dev/null
+++ b/internal/mocks/signer/signer.go
@@ -0,0 +1,22 @@
+package signer
+
+import (
+	"crypto"
+	"crypto/ed25519"
+	"io"
+)
+
+// Signer implements crypto.Signer with fixed outputs.  Use for tests only.
+type Signer struct {
+	PublicKey []byte
+	Signature []byte
+	Error     error
+}
+
+func (s *Signer) Public() crypto.PublicKey {
+	return ed25519.PublicKey(s.PublicKey[:])
+}
+
+func (s *Signer) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
+	return s.Signature[:], s.Error
+}