diff --git a/README.md b/README.md
index 3382490..2f24973 100644
--- a/README.md
+++ b/README.md
@@ -196,7 +196,7 @@ import * as tweetnacl from 'tweetnacl';
 // If you know the sender's public key you can pass it to DearmorAndVerifyStream and it will emit an error if it doesn't match
 const sender_key: Uint8Array = tweetnacl.sign.keyPair().publicKey;
 
-const stream = new DearmorAndVerifyStream(recipient_keypair, sender_key);
+const stream = new DearmorAndVerifyStream(sender_key);
 
 stream.on('end', () => {
     // If you didn't pass the sender's public key you should check it now
diff --git a/src/signcryption/index.ts b/src/signcryption/index.ts
index 2081e97..5e85d49 100644
--- a/src/signcryption/index.ts
+++ b/src/signcryption/index.ts
@@ -19,7 +19,7 @@ export let debug_fix_key: Buffer | null = null;
 export let debug_fix_keypair: tweetnacl.BoxKeyPair | null = null;
 
 export async function signcrypt(
-    data: Uint8Array | string, keypair: tweetnacl.BoxKeyPair | null, recipients_keys: Uint8Array[]
+    data: Uint8Array | string, keypair: tweetnacl.SignKeyPair | null, recipients_keys: Uint8Array[]
 ): Promise<Buffer> {
     const chunks = chunkBuffer(data, CHUNK_LENGTH);
 
@@ -58,13 +58,13 @@ export async function signcrypt(
 export class SigncryptStream extends Transform {
     readonly payload_key: Buffer;
     readonly ephemeral_keypair: tweetnacl.BoxKeyPair;
-    readonly keypair: tweetnacl.BoxKeyPair | null;
+    readonly keypair: tweetnacl.SignKeyPair | null;
     readonly header: SigncryptedMessageHeader;
     private in_buffer = Buffer.alloc(0);
     private payload_index = BigInt(0);
     private i = 0;
 
-    constructor(keypair: tweetnacl.BoxKeyPair | null, recipients_keys: Uint8Array[]) {
+    constructor(keypair: tweetnacl.SignKeyPair | null, recipients_keys: Uint8Array[]) {
         super();
 
         // 1. Generate a random 32-byte payload key.
diff --git a/src/with-armor.ts b/src/with-armor.ts
index 2a5da3f..43b8db2 100644
--- a/src/with-armor.ts
+++ b/src/with-armor.ts
@@ -66,7 +66,7 @@ export async function signAndArmor(data: Uint8Array | string, keypair: tweetnacl
     const signed = sign(data, keypair);
     return armor(signed, {message_type: MessageType.SIGNED_MESSAGE});
 }
-export async function verifyArmored(signed: string, public_key: Uint8Array): Promise<DearmorAndVerifyResult> {
+export async function verifyArmored(signed: string, public_key?: Uint8Array | null): Promise<DearmorAndVerifyResult> {
     const dearmored = dearmor(signed);
     return Object.assign(await verify(dearmored, public_key), {
         remaining: dearmored.remaining,
@@ -113,9 +113,9 @@ export async function signDetachedAndArmor(data: Uint8Array | string, keypair: t
     return armor(signed, {message_type: MessageType.DETACHED_SIGNATURE});
 }
 export async function verifyDetachedArmored(
-    signed: string, data: Uint8Array | string, public_key: Uint8Array
+    signature: string, data: Uint8Array | string, public_key?: Uint8Array | null
 ): Promise<DearmorAndVerifyDetachedResult> {
-    const dearmored = dearmor(signed);
+    const dearmored = dearmor(signature);
     const result = await verifyDetached(dearmored, data, public_key);
 
     return {
@@ -131,16 +131,16 @@ export interface DearmorAndVerifyDetachedResult extends VerifyDetachedResult {
 }
 
 export async function signcryptAndArmor(
-    data: Uint8Array | string, keypair: tweetnacl.BoxKeyPair | null, recipients_keys: Uint8Array[]
+    data: Uint8Array | string, keypair: tweetnacl.SignKeyPair | null, recipients_keys: Uint8Array[]
 ) {
     const encrypted = await signcrypt(data, keypair, recipients_keys);
     return armor(encrypted, {message_type: MessageType.ENCRYPTED_MESSAGE});
 }
 export async function dearmorAndDesigncrypt(
-    encrypted: string, keypair: tweetnacl.BoxKeyPair
+    signcrypted: string, keypair: tweetnacl.BoxKeyPair, sender?: Uint8Array | null
 ): Promise<DearmorAndDesigncryptResult> {
-    const dearmored = dearmor(encrypted);
-    return Object.assign(await designcrypt(dearmored, keypair), {
+    const dearmored = dearmor(signcrypted);
+    return Object.assign(await designcrypt(dearmored, keypair, sender), {
         remaining: dearmored.remaining,
         header_info: dearmored.header_info,
     });
@@ -150,7 +150,7 @@ export type DearmorAndDesigncryptResult = DearmorResult & DesigncryptResult;
 
 export class SigncryptAndArmorStream extends Pumpify {
     constructor(
-        keypair: tweetnacl.BoxKeyPair | null, recipients_keys: Uint8Array[], armor_options?: Partial<ArmorOptions>
+        keypair: tweetnacl.SignKeyPair | null, recipients_keys: Uint8Array[], armor_options?: Partial<ArmorOptions>
     ) {
         const encrypt = new SigncryptStream(keypair, recipients_keys);
         const armor = new ArmorStream(Object.assign({