diff --git a/.github/actions/build-gosop/action.yml b/.github/actions/build-gosop/action.yml
index 64c20e1..a754b67 100644
--- a/.github/actions/build-gosop/action.yml
+++ b/.github/actions/build-gosop/action.yml
@@ -16,7 +16,7 @@ runs:
   using: "composite"
   steps:
     - name: Checkout gopenpgp
-      uses: actions/checkout@v4
+      uses: actions/checkout@v3
       with:
         ref: ${{ inputs.gopenpgp-ref }}
         path: gopenpgp
@@ -32,7 +32,7 @@ runs:
       with:
         go-version: ^1.18
     - name: Check out gosop
-      uses: actions/checkout@v4
+      uses: actions/checkout@v3
       with:
         repository: ProtonMail/gosop
         ref: ${{ env.GOSOP_BRANCH_REF}}
diff --git a/.github/workflows/android.yml b/.github/workflows/android.yml
index 96ecc8d..e98a430 100644
--- a/.github/workflows/android.yml
+++ b/.github/workflows/android.yml
@@ -30,7 +30,7 @@ jobs:
         link-to-sdk: true
 
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v2
 
     - name: Build
       run: |
@@ -41,7 +41,7 @@ jobs:
         find dist
 
     - name: Upload Android artifacts
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v2
       with:
         name: Android build
         path: dist/android
diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 059a2cf..303b8d2 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3
 
       - name: Set up latest golang
         uses: actions/setup-go@v3
@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Check out repo
-      uses: actions/checkout@v4
+      uses: actions/checkout@v3
 
     - name: Set up Go 1.17
       uses: actions/setup-go@v3
@@ -44,7 +44,7 @@ jobs:
       - uses: actions/setup-go@v3
         with:
           go-version: 1.17
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v3
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3
         with:
diff --git a/.github/workflows/ios.yml b/.github/workflows/ios.yml
index 4e1f74d..9feeaa5 100644
--- a/.github/workflows/ios.yml
+++ b/.github/workflows/ios.yml
@@ -15,7 +15,7 @@ jobs:
       - name: Set up xcode 14.3
         uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: 15.3.0
+          xcode-version: 14.3
         id: xcode
 
       - name: Set up Go 1.x
@@ -25,7 +25,7 @@ jobs:
         id: go
 
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
 
       - name: Build
         env:
@@ -35,7 +35,7 @@ jobs:
           find dist
 
       - name: Upload xcframework
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v2
         with:
           name: gopenpgp.xcframework
           path: dist/apple/gopenpgp.xcframework
diff --git a/.github/workflows/sop-test-suite.yml b/.github/workflows/sop-test-suite.yml
index 611eab8..77e987b 100644
--- a/.github/workflows/sop-test-suite.yml
+++ b/.github/workflows/sop-test-suite.yml
@@ -11,14 +11,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3
       - name: Build gosop from branch
         uses: ./.github/actions/build-gosop
         with: 
           binary-location: ./gosop-${{ github.sha }}
       # Upload as artifact
       - name: Upload gosop artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: gosop-${{ github.sha }}
           path: ./gosop-${{ github.sha }}
@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3
       - name: Build gosop from branch
         uses: ./.github/actions/build-gosop
         with: 
@@ -36,7 +36,7 @@ jobs:
           binary-location: ./gosop-target
       # Upload as artifact
       - name: Upload gosop-target artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: gosop-target
           path: ./gosop-target
@@ -55,10 +55,10 @@ jobs:
       - build-gosop-target
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3
       # Fetch gosop from target
       - name: Download gosop-target
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           name: gosop-target
       # Test gosop-target
@@ -68,7 +68,7 @@ jobs:
         run: ./gosop-target version --extended
       # Fetch gosop from branch
       - name: Download gosop-branch
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           name: gosop-${{ github.sha }}
       - name: Rename gosop-branch
@@ -94,12 +94,12 @@ jobs:
          RESULTS_HTML: .github/test-suite/test-suite-results.html
       # Upload results
       - name: Upload test results json artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: test-suite-results.json
           path: .github/test-suite/test-suite-results.json
       - name: Upload test results html artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: test-suite-results.html
           path: .github/test-suite/test-suite-results.html
@@ -110,10 +110,10 @@ jobs:
     needs: test-suite
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v3
       - name: Download test results json artifact
         id: download-test-results
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           name: test-suite-results.json
       - name: Compare with baseline
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d018ba..5de4774 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,21 +4,6 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [2.8.1] 2024-11-25
-### Changed
-- Update go-crypto to `1.1.3`.
-
-## [2.8.0] 2024-10-07
-### Changed
-- Update go-crypto to `1.1.0`.
-
-## [2.8.0-beta.0] 2024-10-01
-### Added
-- Add `GetSHA256Fingerprint` method to `Key`.
-
-### Changed
-- Update go-crypto to `1.1.0-beta.0`.
-
 ## [2.8.0-alpha.1] 2024-04-09
 
 ### Added
diff --git a/constants/armor.go b/constants/armor.go
index 9a8b0c0..8420af2 100644
--- a/constants/armor.go
+++ b/constants/armor.go
@@ -3,7 +3,7 @@ package constants
 
 // Constants for armored data.
 const (
-	ArmorHeaderVersion = "GopenPGP 2.8.1"
+	ArmorHeaderVersion = "GopenPGP 2.8.0"
 	ArmorHeaderComment = "https://gopenpgp.org"
 	PGPMessageHeader   = "PGP MESSAGE"
 	PGPSignatureHeader = "PGP SIGNATURE"
diff --git a/constants/version.go b/constants/version.go
index 472adac..7ab3b2c 100644
--- a/constants/version.go
+++ b/constants/version.go
@@ -1,3 +1,3 @@
 package constants
 
-const Version = "2.8.1"
+const Version = "2.8.0"
diff --git a/crypto/key.go b/crypto/key.go
index 7ab30b4..16c50d9 100644
--- a/crypto/key.go
+++ b/crypto/key.go
@@ -365,14 +365,9 @@ func (key *Key) GetFingerprint() string {
 	return hex.EncodeToString(key.entity.PrimaryKey.Fingerprint)
 }
 
-// GetSHA256Fingerprint computes the SHA256 fingerprint of the primary key.
-func (key *Key) GetSHA256Fingerprint() (fingerprint string) {
-	return hex.EncodeToString(getSHA256FingerprintBytes(key.entity.PrimaryKey))
-}
-
 // GetSHA256Fingerprints computes the SHA256 fingerprints of the key and subkeys.
 func (key *Key) GetSHA256Fingerprints() (fingerprints []string) {
-	fingerprints = append(fingerprints, key.GetSHA256Fingerprint())
+	fingerprints = append(fingerprints, hex.EncodeToString(getSHA256FingerprintBytes(key.entity.PrimaryKey)))
 	for _, sub := range key.entity.Subkeys {
 		fingerprints = append(fingerprints, hex.EncodeToString(getSHA256FingerprintBytes(sub.PublicKey)))
 	}
diff --git a/crypto/key_test.go b/crypto/key_test.go
index e8c4771..e80c6c0 100644
--- a/crypto/key_test.go
+++ b/crypto/key_test.go
@@ -374,8 +374,6 @@ func TestGetSHA256FingerprintsV4(t *testing.T) {
 	assert.Len(t, sha256Fingerprints, 2)
 	assert.Exactly(t, "d9ac0b857da6d2c8be985b251a9e3db31e7a1d2d832d1f07ebe838a9edce9c24", sha256Fingerprints[0])
 	assert.Exactly(t, "203dfba1f8442c17e59214d9cd11985bfc5cc8721bb4a71740dd5507e58a1a0d", sha256Fingerprints[1])
-
-	assert.Exactly(t, "d9ac0b857da6d2c8be985b251a9e3db31e7a1d2d832d1f07ebe838a9edce9c24", publicKey.GetSHA256Fingerprint())
 }
 
 func TestGetEntity(t *testing.T) {
diff --git a/crypto/signature.go b/crypto/signature.go
index b74ecc3..f5c58ab 100644
--- a/crypto/signature.go
+++ b/crypto/signature.go
@@ -17,15 +17,11 @@ import (
 	"github.com/ProtonMail/gopenpgp/v2/internal"
 )
 
-// allowedHashes stores the allowed OpenPGP hashes that can be used in a
-// message signature hash.
 var allowedHashes = []crypto.Hash{
 	crypto.SHA224,
 	crypto.SHA256,
 	crypto.SHA384,
 	crypto.SHA512,
-	crypto.SHA3_256,
-	crypto.SHA3_512,
 }
 
 // SignatureVerificationError is returned from Decrypt and VerifyDetached
diff --git a/crypto/signature_test.go b/crypto/signature_test.go
index feca63d..de32e1f 100644
--- a/crypto/signature_test.go
+++ b/crypto/signature_test.go
@@ -301,7 +301,7 @@ func Test_SignDetachedWithNonCriticalContext(t *testing.T) {
 		t.Fatal("Packet was not a signature")
 	}
 	notations := sig.Notations
-	if len(notations) != 2 {
+	if len(notations) != 1 {
 		t.Fatal("Wrong number of notations")
 	}
 	notation := notations[0]
@@ -344,7 +344,7 @@ func Test_SignDetachedWithCriticalContext(t *testing.T) {
 		t.Fatal("Packet was not a signature")
 	}
 	notations := sig.Notations
-	if len(notations) != 2 {
+	if len(notations) != 1 {
 		t.Fatal("Wrong number of notations")
 	}
 	notation := notations[0]
diff --git a/go.mod b/go.mod
index 9dc0adb..8d21b6c 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/ProtonMail/gopenpgp/v2
 go 1.17
 
 require (
-	github.com/ProtonMail/go-crypto v1.1.3
+	github.com/ProtonMail/go-crypto v1.1.0-alpha.1
 	github.com/ProtonMail/go-mime v0.0.0-20230322103455-7d82a3887f2f
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.7.0
@@ -18,5 +18,3 @@ require (
 	golang.org/x/text v0.14.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )
-
-replace github.com/ProtonMail/go-crypto => github.com/mssun/go-crypto v1.1.3-mssun-passforios
diff --git a/go.sum b/go.sum
index 0278620..260c580 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-github.com/ProtonMail/go-crypto v1.1.3 h1:nRBOetoydLeUb4nHajyO2bKqMLfWQ/ZPwkXqXxPxCFk=
-github.com/ProtonMail/go-crypto v1.1.3/go.mod h1:rA3QumHc/FZ8pAHreoekgiAbzpNsfQAosU5td4SnOrE=
+github.com/ProtonMail/go-crypto v1.1.0-alpha.1 h1:iKLDnKGL+3u4Q5OjYgixAxWdkkGBPidCQumqVryUgtY=
+github.com/ProtonMail/go-crypto v1.1.0-alpha.1/go.mod h1:rA3QumHc/FZ8pAHreoekgiAbzpNsfQAosU5td4SnOrE=
 github.com/ProtonMail/go-mime v0.0.0-20230322103455-7d82a3887f2f h1:tCbYj7/299ekTTXpdwKYF8eBlsYsDVoggDAuAjoK66k=
 github.com/ProtonMail/go-mime v0.0.0-20230322103455-7d82a3887f2f/go.mod h1:gcr0kNtGBqin9zDW9GOHcVntrwnjrK+qdJ06mWYBybw=
 github.com/bwesterb/go-ristretto v1.2.3/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
diff --git a/helper/helper.go b/helper/helper.go
index 59d4024..76c1f12 100644
--- a/helper/helper.go
+++ b/helper/helper.go
@@ -4,134 +4,8 @@ package helper
 import (
 	"github.com/ProtonMail/gopenpgp/v2/crypto"
 	"github.com/pkg/errors"
-	goerrors "errors"
-        pgpErrors "github.com/ProtonMail/go-crypto/openpgp/errors"
-	"github.com/ProtonMail/go-crypto/openpgp/packet"
-	"github.com/ProtonMail/go-crypto/openpgp"
-	"io"
-        "bytes"
-	"encoding/json"
-	"fmt"
-	"strconv"
 )
 
-func PassGetEncryptedMPI1(pgpMessage *crypto.PGPMessage) (encryptedMPI1 []byte, err error) {
-	var p packet.Packet
-	packets := packet.NewReader(pgpMessage.NewReader())
-	var mpi1 []byte
-
-Loop1:
-	for {
-		if p, err = packets.Next(); goerrors.Is(err, io.EOF) {
-			break
-		}
-
-		switch p := p.(type) {
-		case *packet.EncryptedKey:
-                        mpi1 = p.GetEncryptedMPI1()
-			break Loop1
-		}
-	}
-
-	return mpi1, nil
-}
-
-func PassGetEncryptedMPI2(pgpMessage *crypto.PGPMessage) (encryptedMPI2 []byte, err error) {
-	var p packet.Packet
-	packets := packet.NewReader(pgpMessage.NewReader())
-	var mpi2 []byte
-
-Loop1:
-	for {
-		if p, err = packets.Next(); goerrors.Is(err, io.EOF) {
-			break
-		}
-
-		switch p := p.(type) {
-		case *packet.EncryptedKey:
-                        mpi2 = p.GetEncryptedMPI2()
-			break Loop1
-		}
-	}
-
-	return mpi2, nil
-}
-
-
-func PassGetHexSubkeyIDsJSON(key *crypto.Key) []byte {
-	subKeys := key.GetEntity().Subkeys
-	hexSubkeyIDs := make([]string, len(subKeys))
-	for i, subKey := range subKeys {
-		hexSubkeyIDs[i] = fmt.Sprintf("%016v", strconv.FormatUint(subKey.PublicKey.KeyId, 16))
-	}
-
-	result, err := json.Marshal(hexSubkeyIDs)
-	if err != nil {
-		return nil
-	}
-	return result
-}
-
-
-func PassDecryptWithSessionKey(pgpMessage *crypto.PGPMessage, sk *crypto.SessionKey) (plain_message  *crypto.PlainMessage, err error) {
-	var p packet.Packet
-	packets := packet.NewReader(pgpMessage.NewReader())
-	var edp packet.EncryptedDataPacket
-
-Loop1:
-	for {
-		if p, err = packets.Next(); goerrors.Is(err, io.EOF) {
-			break
-		}
-
-		switch p := p.(type) {
-		case *packet.SymmetricallyEncrypted, *packet.AEADEncrypted:
-			edp = p.(packet.EncryptedDataPacket)
-			break Loop1
-		}
-	}
-
-	var decrypted io.ReadCloser
-	f, err := sk.GetCipherFunc()
-	decrypted, err = edp.Decrypt(f, sk.Key)
-	packets.Push(decrypted)
-
-	md := new(openpgp.MessageDetails)
-Loop2:
-	for {
-		if p, err = packets.Next(); goerrors.Is(err, io.EOF) {
-			break
-		}
-		switch p := p.(type) {
-		case *packet.Compressed:
-			packets.Push(p.Body)
-		case *packet.LiteralData:
-			md.LiteralData = p
-			md.UnverifiedBody = md.LiteralData.Body
-			break Loop2
-		}
-	}
-
-	messageBuf := bytes.NewBuffer(nil)
-	_, err = io.Copy(messageBuf, md.UnverifiedBody)
-	if errors.Is(err, pgpErrors.ErrMDCHashMismatch) {
-		// This MDC error may also be triggered if the password is correct, but the encrypted data was corrupted.
-		// To avoid confusion, we do not inform the user about the second possibility.
-		return nil, errors.New("gopenpgp: wrong password in symmetric decryption")
-	}
-	if err != nil {
-		// Parsing errors after decryption, triggered before parsing the MDC packet, are also usually the result of wrong password
-		return nil, errors.New("gopenpgp: error in reading password protected message: wrong password or malformed message")
-	}
-
-	return &crypto.PlainMessage{
-		Data:     messageBuf.Bytes(),
-		TextType: !md.LiteralData.IsBinary,
-		Filename: md.LiteralData.FileName,
-		Time:     md.LiteralData.Time,
-	}, nil
-}
-
 // EncryptMessageWithPassword encrypts a string with a passphrase using AES256.
 func EncryptMessageWithPassword(password []byte, plaintext string) (ciphertext string, err error) {
 	var pgpMessage *crypto.PGPMessage