diff --git a/src/models/entities/user-keypair.ts b/src/models/entities/user-keypair.ts
index 06b98d2536..be264641f7 100644
--- a/src/models/entities/user-keypair.ts
+++ b/src/models/entities/user-keypair.ts
@@ -20,5 +20,10 @@ export class UserKeypair {
 	@Column('varchar', {
 		length: 4096,
 	})
-	public keyPem: string;
+	public publicKey: string;
+
+	@Column('varchar', {
+		length: 4096,
+	})
+	public privateKey: string;
 }
diff --git a/src/remote/activitypub/renderer/key.ts b/src/remote/activitypub/renderer/key.ts
index fb5975a6c4..334e5e00cd 100644
--- a/src/remote/activitypub/renderer/key.ts
+++ b/src/remote/activitypub/renderer/key.ts
@@ -1,4 +1,3 @@
-import { createPublicKey } from 'crypto';
 import config from '../../../config';
 import { ILocalUser } from '../../../models/entities/user';
 import { UserKeypair } from '../../../models/entities/user-keypair';
@@ -7,5 +6,5 @@ export default (user: ILocalUser, key: UserKeypair) => ({
 	id: `${config.url}/users/${user.id}/publickey`,
 	type: 'Key',
 	owner: `${config.url}/users/${user.id}`,
-	publicKeyPem: createPublicKey(key.keyPem)
+	publicKeyPem: key.publicKey
 });
diff --git a/src/remote/activitypub/request.ts b/src/remote/activitypub/request.ts
index a089ed371c..c50d05e2a6 100644
--- a/src/remote/activitypub/request.ts
+++ b/src/remote/activitypub/request.ts
@@ -67,7 +67,7 @@ export default async (user: ILocalUser, url: string, object: any) => {
 
 		sign(req, {
 			authorizationHeaderName: 'Signature',
-			key: keypair.keyPem,
+			key: keypair.privateKey,
 			keyId: `${config.url}/users/${user.id}/publickey`,
 			headers: ['date', 'host', 'digest']
 		});
diff --git a/src/server/api/private/signup.ts b/src/server/api/private/signup.ts
index 1d304b8e11..8ab702bd8a 100644
--- a/src/server/api/private/signup.ts
+++ b/src/server/api/private/signup.ts
@@ -10,6 +10,7 @@ import { genId } from '../../../misc/gen-id';
 import { usersChart } from '../../../services/chart';
 import { UserServiceLinking } from '../../../models/entities/user-service-linking';
 import { User } from '../../../models/entities/user';
+import { UserKeypair } from '../../../models/entities/user-keypair';
 
 export default async (ctx: Koa.BaseContext) => {
 	const body = ctx.request.body as any;
@@ -80,6 +81,23 @@ export default async (ctx: Koa.BaseContext) => {
 		return;
 	}
 
+	const keyPair = await new Promise<string[]>((s, j) =>
+		generateKeyPair('rsa', {
+			modulusLength: 4096,
+			publicKeyEncoding: {
+				type: 'pkcs1',
+				format: 'pem'
+			},
+			privateKeyEncoding: {
+				type: 'pkcs1',
+				format: 'pem',
+				cipher: undefined,
+				passphrase: undefined
+			}
+		}, (e, publicKey, privateKey) =>
+			e ? j(e) : s([publicKey, privateKey])
+		));
+
 	const account = await Users.save({
 		id: genId(),
 		createdAt: new Date(),
@@ -95,21 +113,10 @@ export default async (ctx: Koa.BaseContext) => {
 
 	await UserKeypairs.save({
 		id: genId(),
-		keyPem: await new Promise<string>((s, j) => generateKeyPair('rsa', {
-			modulusLength: 4096,
-			publicKeyEncoding: {
-				type: 'pkcs1',
-				format: 'pem'
-			},
-			privateKeyEncoding: {
-				type: 'pkcs1',
-				format: 'pem',
-				cipher: undefined,
-				passphrase: undefined
-			}
-		}, (e, _, x) => e ? j(e) : s(x))),
+		publicKey: keyPair[0],
+		privateKey: keyPair[1],
 		userId: account.id
-	});
+	} as UserKeypair);
 
 	await UserServiceLinkings.save({
 		id: genId(),