diff --git a/crypto/message.go b/crypto/message.go
index d6072fe..4f34be4 100644
--- a/crypto/message.go
+++ b/crypto/message.go
@@ -92,7 +92,7 @@ func NewPlainMessageFromFile(data []byte, filename string, time uint32) *PlainMe
 // This allows seamless conversion to clear text signed messages (see RFC 4880 5.2.1 and 7.1).
 func NewPlainMessageFromString(text string) *PlainMessage {
 	return &PlainMessage{
-		Data:     []byte(internal.CanonicalizeAndTrim(text)),
+		Data:     []byte(internal.Canonicalize(text)),
 		TextType: true,
 		Filename: "",
 		Time:     uint32(GetUnixTime()),
diff --git a/crypto/signature_collector.go b/crypto/signature_collector.go
index b5aefa6..05f2ecb 100644
--- a/crypto/signature_collector.go
+++ b/crypto/signature_collector.go
@@ -99,7 +99,7 @@ func (sc *SignatureCollector) Accept(
 	}
 	sc.signature = string(buffer)
 	str, _ := ioutil.ReadAll(rawBody)
-	canonicalizedBody := internal.CanonicalizeAndTrim(string(str))
+	canonicalizedBody := internal.Canonicalize(internal.TrimEachLine(string(str)))
 	rawBody = bytes.NewReader([]byte(canonicalizedBody))
 	if sc.keyring != nil {
 		_, err = openpgp.CheckArmoredDetachedSignature(sc.keyring, rawBody, bytes.NewReader(buffer), sc.config)
diff --git a/helper/cleartext.go b/helper/cleartext.go
index c318739..d5517b1 100644
--- a/helper/cleartext.go
+++ b/helper/cleartext.go
@@ -2,6 +2,7 @@ package helper
 
 import (
 	"github.com/ProtonMail/gopenpgp/v2/crypto"
+	"github.com/ProtonMail/gopenpgp/v2/internal"
 	"github.com/pkg/errors"
 )
 
@@ -48,7 +49,7 @@ func VerifyCleartextMessageArmored(publicKey, armored string, verifyTime int64)
 // SignCleartextMessage signs text given a private keyring, canonicalizes and
 // trims the newlines, and returns the PGP-compliant special armoring.
 func SignCleartextMessage(keyRing *crypto.KeyRing, text string) (string, error) {
-	message := crypto.NewPlainMessageFromString(text)
+	message := crypto.NewPlainMessageFromString(internal.TrimEachLine(text))
 
 	signature, err := keyRing.SignDetached(message)
 	if err != nil {
@@ -67,7 +68,7 @@ func VerifyCleartextMessage(keyRing *crypto.KeyRing, armored string, verifyTime
 		return "", errors.Wrap(err, "gopengpp: unable to unarmor cleartext message")
 	}
 
-	message := crypto.NewPlainMessageFromString(clearTextMessage.GetString())
+	message := crypto.NewPlainMessageFromString(internal.TrimEachLine(clearTextMessage.GetString()))
 	signature := crypto.NewPGPSignature(clearTextMessage.GetBinarySignature())
 	err = keyRing.VerifyDetached(message, signature, verifyTime)
 	if err != nil {
diff --git a/helper/cleartext_test.go b/helper/cleartext_test.go
index 6cf25b6..1e39ff9 100644
--- a/helper/cleartext_test.go
+++ b/helper/cleartext_test.go
@@ -45,5 +45,5 @@ func TestSignClearText(t *testing.T) {
 	if err != nil {
 		t.Fatal("Cannot parse message:", err)
 	}
-	assert.Exactly(t, internal.CanonicalizeAndTrim(inputPlainText), string(clearTextMessage.GetBinary()))
+	assert.Exactly(t, internal.Canonicalize(internal.TrimEachLine(inputPlainText)), string(clearTextMessage.GetBinary()))
 }
diff --git a/internal/common.go b/internal/common.go
index 9704cd0..534b33d 100644
--- a/internal/common.go
+++ b/internal/common.go
@@ -7,14 +7,18 @@ import (
 	"github.com/ProtonMail/gopenpgp/v2/constants"
 )
 
-func CanonicalizeAndTrim(text string) string {
+func Canonicalize(text string) string {
+	return strings.ReplaceAll(strings.ReplaceAll(text, "\r\n", "\n"), "\n", "\r\n")
+}
+
+func TrimEachLine(text string) string {
 	lines := strings.Split(text, "\n")
 
 	for i := range lines {
 		lines[i] = strings.TrimRight(lines[i], " \t\r")
 	}
 
-	return strings.Join(lines, "\r\n")
+	return strings.Join(lines, "\n")
 }
 
 // CreationTimeOffset stores the amount of seconds that a signature may be