diff --git a/canonicalize.go b/canonicalize.go
deleted file mode 100644
index 57f9814..0000000
--- a/canonicalize.go
+++ /dev/null
@@ -1,92 +0,0 @@
-// Copyright (C) 2019 Opsmate, Inc.
-//
-// This Source Code Form is subject to the terms of the Mozilla
-// Public License, v. 2.0. If a copy of the MPL was not distributed
-// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
-//
-// This software is distributed WITHOUT A WARRANTY OF ANY KIND.
-// See the Mozilla Public License for details.
-
-package certspotter
-
-import (
-	"encoding/asn1"
-)
-
-func canonicalizeRDNString(fromStr string) string {
-	from := []byte(fromStr)
-	to := []byte{}
-	inWhitespace := true
-	for _, ch := range from {
-		if ch == ' ' || ch == '\f' || ch == '\n' || ch == '\r' || ch == '\t' || ch == '\v' {
-			if !inWhitespace {
-				to = append(to, ' ')
-			}
-			inWhitespace = true
-		} else {
-			if ch >= 'A' && ch <= 'Z' {
-				to = append(to, ch+32) // convert to lowercase
-			} else {
-				to = append(to, ch)
-			}
-			inWhitespace = false
-		}
-	}
-	if inWhitespace && len(to) > 0 {
-		// whack off the space character that we appended
-		to = to[:len(to)-1]
-	}
-	return string(to)
-}
-
-func shouldCanonicalizeASN1String(value *asn1.RawValue) bool {
-	if !value.IsCompound && value.Class == 0 {
-		return value.Tag == 12 || value.Tag == 19 || value.Tag == 22 || value.Tag == 20 || value.Tag == 26 || value.Tag == 30 || value.Tag == 28
-	}
-	return false
-}
-
-func canonicalizeATV(oldATV AttributeTypeAndValue) (AttributeTypeAndValue, error) {
-	if shouldCanonicalizeASN1String(&oldATV.Value) {
-		str, err := decodeASN1String(&oldATV.Value)
-		if err != nil {
-			return AttributeTypeAndValue{}, err
-		}
-		str = canonicalizeRDNString(str)
-		return AttributeTypeAndValue{
-			Type: oldATV.Type,
-			Value: asn1.RawValue{
-				Class:      0,
-				Tag:        asn1.TagUTF8String,
-				IsCompound: false,
-				Bytes:      []byte(str),
-			},
-		}, nil
-	} else {
-		return oldATV, nil
-	}
-}
-
-func canonicalizeRDNSet(oldSet RelativeDistinguishedNameSET) (RelativeDistinguishedNameSET, error) {
-	newSet := make([]AttributeTypeAndValue, len(oldSet))
-	for i := range oldSet {
-		var err error
-		newSet[i], err = canonicalizeATV(oldSet[i])
-		if err != nil {
-			return nil, err
-		}
-	}
-	return newSet, nil
-}
-
-func CanonicalizeRDNSequence(oldSequence RDNSequence) (RDNSequence, error) {
-	newSequence := make([]RelativeDistinguishedNameSET, len(oldSequence))
-	for i := range oldSequence {
-		var err error
-		newSequence[i], err = canonicalizeRDNSet(oldSequence[i])
-		if err != nil {
-			return nil, err
-		}
-	}
-	return newSequence, nil
-}