chore: update vendor

vendor/github.com/google/certificate-transparency-go/tls/types.go

@@ -14,7 +14,13 @@
 
 package tls
 
-import "fmt"
+import (
+	"crypto"
+	"crypto/dsa"
+	"crypto/ecdsa"
+	"crypto/rsa"
+	"fmt"
+)
 
 // DigitallySigned gives information about a signature, including the algorithm used
 // and the signature value.  Defined in RFC 5246 s4.7.
@@ -94,3 +100,18 @@ func (s SignatureAlgorithm) String() string {
 		return fmt.Sprintf("UNKNOWN(%d)", s)
 	}
 }
+
+// SignatureAlgorithmFromPubKey returns the algorithm used for this public key.
+// ECDSA, RSA, and DSA keys are supported. Other key types will return Anonymous.
+func SignatureAlgorithmFromPubKey(k crypto.PublicKey) SignatureAlgorithm {
+	switch k.(type) {
+	case *ecdsa.PublicKey:
+		return ECDSA
+	case *rsa.PublicKey:
+		return RSA
+	case *dsa.PublicKey:
+		return DSA
+	default:
+		return Anonymous
+	}
+}

vendor/github.com/google/certificate-transparency-go/tls/types_test.go

@@ -14,7 +14,13 @@
 
 package tls
 
-import "testing"
+import (
+	"crypto"
+	"crypto/dsa"
+	"crypto/ecdsa"
+	"crypto/rsa"
+	"testing"
+)
 
 func TestHashAlgorithmString(t *testing.T) {
 	var tests = []struct {
@@ -75,3 +81,20 @@ func TestDigitallySignedString(t *testing.T) {
 		}
 	}
 }
+
+func TestSignatureAlgorithm(t *testing.T) {
+	for _, test := range []struct {
+		name string
+		key  crypto.PublicKey
+		want SignatureAlgorithm
+	}{
+		{name: "ECDSA", key: new(ecdsa.PublicKey), want: ECDSA},
+		{name: "RSA", key: new(rsa.PublicKey), want: RSA},
+		{name: "DSA", key: new(dsa.PublicKey), want: DSA},
+		{name: "Other", key: "foo", want: Anonymous},
+	} {
+		if got := SignatureAlgorithmFromPubKey(test.key); got != test.want {
+			t.Errorf("%v: SignatureAlgorithm() = %v, want %v", test.name, got, test.want)
+		}
+	}
+}