feat: Expose canonical write for gopenpgpg

openpgp/canonical_text.go

@@ -15,6 +15,12 @@ func NewCanonicalTextHash(h hash.Hash) hash.Hash {
 	return &canonicalTextHash{h, 0}
 }
 
+// NewCanonicalTextWriter reformats text written to it into the canonical
+// form. See RFC 4880, section 5.2.1.
+func NewCanonicalTextWriter(w io.Writer) io.Writer {
+	return &canonicalTextWriter{w, 0}
+}
+
 type canonicalTextHash struct {
 	h hash.Hash
 	s int
@@ -63,3 +69,12 @@ func (cth *canonicalTextHash) Size() int {
 func (cth *canonicalTextHash) BlockSize() int {
 	return cth.h.BlockSize()
 }
+
+type canonicalTextWriter struct {
+	w io.Writer
+	s int
+}
+
+func (tw *canonicalTextWriter) Write(buf []byte) (int, error) {
+	return writeCanonical(tw.w, buf, &tw.s)
+}