POST /import/encryption-key generating RSA keypair for imports

apps/vault/src/vault/core/service/import.service.ts

@@ -1,23 +1,38 @@
 import { Hex } from '@narval/policy-engine-shared'
+import { Alg, RsaPrivateKey, RsaPublicKey, generateJwk, rsaPrivateKeyToPublicKey } from '@narval/signature'
 import { Injectable, Logger } from '@nestjs/common'
 import { privateKeyToAddress } from 'viem/accounts'
 import { Wallet } from '../../../shared/type/domain.type'
+import { ImportRepository } from '../../persistence/repository/import.repository'
 import { WalletRepository } from '../../persistence/repository/wallet.repository'
 
 @Injectable()
 export class ImportService {
   private logger = new Logger(ImportService.name)
 
-  constructor(private walletRepository: WalletRepository) {}
+  constructor(
+    private walletRepository: WalletRepository,
+    private importRepository: ImportRepository
+  ) {}
 
-  async importPrivateKey(tenantId: string, privateKey: Hex, walletId?: string): Promise<Wallet> {
+  async generateEncryptionKey(clientId: string): Promise<RsaPublicKey> {
+    const privateKey = await generateJwk<RsaPrivateKey>(Alg.RS256, { use: 'enc' })
+    const publicKey = rsaPrivateKeyToPublicKey(privateKey)
+
+    // Save the privateKey
+    await this.importRepository.save(clientId, privateKey)
+
+    return publicKey
+  }
+
+  async importPrivateKey(clientId: string, privateKey: Hex, walletId?: string): Promise<Wallet> {
     this.logger.log('Importing private key', {
-      tenantId
+      clientId
     })
     const address = privateKeyToAddress(privateKey)
     const id = walletId || this.generateWalletId(address)
 
-    const wallet = await this.walletRepository.save(tenantId, {
+    const wallet = await this.walletRepository.save(clientId, {
       id,
       privateKey,
       address

apps/vault/src/vault/http/rest/controller/import.controller.ts

@@ -2,6 +2,7 @@ import { Body, Controller, Post, UseGuards } from '@nestjs/common'
 import { ClientId } from '../../../../shared/decorator/client-id.decorator'
 import { ClientSecretGuard } from '../../../../shared/guard/client-secret.guard'
 import { ImportService } from '../../../core/service/import.service'
+import { GenerateEncryptionKeyResponseDto } from '../dto/generate-encryption-key-response.dto'
 import { ImportPrivateKeyDto } from '../dto/import-private-key-dto'
 import { ImportPrivateKeyResponseDto } from '../dto/import-private-key-response-dto'
 
@@ -10,6 +11,15 @@ import { ImportPrivateKeyResponseDto } from '../dto/import-private-key-response-
 export class ImportController {
   constructor(private importService: ImportService) {}
 
+  @Post('/encryption-key')
+  async generateEncryptionKey(@ClientId() clientId: string) {
+    const publicKey = await this.importService.generateEncryptionKey(clientId)
+
+    const response = new GenerateEncryptionKeyResponseDto(publicKey)
+
+    return response
+  }
+
   @Post('/private-key')
   async create(@ClientId() clientId: string, @Body() body: ImportPrivateKeyDto) {
     const importedKey = await this.importService.importPrivateKey(clientId, body.privateKey, body.walletId)

apps/vault/src/vault/http/rest/dto/generate-encryption-key-response.dto.ts

@@ -0,0 +1,12 @@
+import { RsaPublicKeyDto } from '@narval/policy-engine-shared'
+import { RsaPublicKey } from '@narval/signature'
+import { ApiProperty } from '@nestjs/swagger'
+
+export class GenerateEncryptionKeyResponseDto {
+  constructor(publicKey: RsaPublicKey) {
+    this.publicKey = publicKey
+  }
+
+  @ApiProperty()
+  publicKey: RsaPublicKeyDto
+}

apps/vault/src/vault/persistence/repository/import.repository.ts

@@ -0,0 +1,50 @@
+import { RsaPrivateKey, rsaPrivateKeySchema } from '@narval/signature'
+import { Injectable } from '@nestjs/common'
+import { z } from 'zod'
+import { EncryptKeyValueService } from '../../../shared/module/key-value/core/service/encrypt-key-value.service'
+
+const importKeySchema = z.object({
+  jwk: rsaPrivateKeySchema,
+  createdAt: z.number() // epoch in seconds
+})
+export type ImportKey = z.infer<typeof importKeySchema>
+
+@Injectable()
+export class ImportRepository {
+  private KEY_PREFIX = 'import:'
+
+  constructor(private keyValueService: EncryptKeyValueService) {}
+
+  getKey(clientId: string, id: string): string {
+    return `${this.KEY_PREFIX}:${clientId}:${id}`
+  }
+
+  async findById(clientId: string, id: string): Promise<ImportKey | null> {
+    const value = await this.keyValueService.get(this.getKey(clientId, id))
+
+    if (value) {
+      return this.decode(value)
+    }
+
+    return null
+  }
+
+  async save(clientId: string, privateKey: RsaPrivateKey): Promise<ImportKey> {
+    const createdAt = Date.now() / 1000
+    const importKey: ImportKey = {
+      jwk: privateKey,
+      createdAt
+    }
+    await this.keyValueService.set(this.getKey(clientId, privateKey.kid), this.encode(importKey))
+
+    return importKey
+  }
+
+  private encode(importKey: ImportKey): string {
+    return JSON.stringify(importKey)
+  }
+
+  private decode(value: string): ImportKey {
+    return importKeySchema.parse(JSON.parse(value))
+  }
+}

apps/vault/src/vault/vault.module.ts

@@ -17,6 +17,7 @@ import { SigningService } from './core/service/signing.service'
 import { ImportController } from './http/rest/controller/import.controller'
 import { SignController } from './http/rest/controller/sign.controller'
 import { AppRepository } from './persistence/repository/app.repository'
+import { ImportRepository } from './persistence/repository/import.repository'
 import { WalletRepository } from './persistence/repository/wallet.repository'
 import { VaultController } from './vault.controller'
 import { VaultService } from './vault.service'
@@ -46,6 +47,7 @@ import { VaultService } from './vault.service'
     ProvisionService,
     SigningService,
     WalletRepository,
+    ImportRepository,
     {
       provide: APP_PIPE,
       useFactory: () =>

packages/nestjs-shared/src/lib/dto/index.ts

@@ -1,5 +1,6 @@
 export * from './base-action-request.dto'
 export * from './base-action.dto'
+export * from './rsa-public-key.dto'
 export * from './sign-message-request-data-dto'
 export * from './sign-transaction-request-data.dto'
 export * from './signature.dto'

packages/nestjs-shared/src/lib/dto/rsa-public-key.dto.ts

@@ -0,0 +1,46 @@
+import { ApiProperty } from '@nestjs/swagger'
+import { IsDefined, IsIn, IsOptional, IsString } from 'class-validator'
+
+export class RsaPublicKeyDto {
+  @IsString()
+  @IsDefined()
+  @ApiProperty()
+  kid: string
+
+  @IsString()
+  @IsDefined()
+  @ApiProperty({
+    enum: ['RSA'],
+    default: 'RSA'
+  })
+  kty: 'RSA'
+
+  @IsString()
+  @IsDefined()
+  @ApiProperty({
+    enum: ['RS256'],
+    default: 'RS256'
+  })
+  alg: 'RS256'
+
+  @IsString()
+  @IsDefined()
+  @ApiProperty({
+    description: 'A base64Url-encoded value'
+  })
+  n: string
+
+  @IsString()
+  @IsDefined()
+  @ApiProperty({
+    description: 'A base64Url-encoded value'
+  })
+  e: string
+
+  @IsIn(['enc', 'sig'])
+  @IsOptional()
+  @ApiProperty({
+    enum: ['enc', 'sig']
+  })
+  use?: 'enc' | 'sig' | undefined
+}

packages/signature/src/lib/__test__/unit/sign.spec.ts

@@ -5,7 +5,7 @@ import { createPublicKey } from 'node:crypto'
 import { toHex, verifyMessage } from 'viem'
 import { privateKeyToAccount, signMessage } from 'viem/accounts'
 import { buildSignerEip191, buildSignerEs256k, signJwt } from '../../sign'
-import { Alg, Payload, SigningAlg } from '../../types'
+import { Alg, Payload, PrivateKey, SigningAlg } from '../../types'
 import {
   base64UrlToBytes,
   base64UrlToHex,