# 使用RSA密钥对（PKCS1模式）签名及签名恢复(ArkTS)


对应的算法规格请查看[签名验签算法规格：RSA](crypto-sign-sig-verify-overview.md#rsa)。


**签名**


1. 调用[cryptoFramework.createAsyKeyGenerator](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#cryptoframeworkcreateasykeygenerator)、[AsyKeyGenerator.generateKeyPair](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#generatekeypair-1)，生成密钥算法为RSA、密钥长度为1024位、素数个数为2的非对称密钥对象（KeyPair），包括公钥（PubKey）和私钥（PriKey）。
   
   如何生成RSA非对称密钥，开发者可参考下文示例，并结合[非对称密钥生成和转换规格：RSA](crypto-asym-key-generation-conversion-spec.md#rsa)和[随机生成非对称密钥对](crypto-generate-asym-key-pair-randomly.md)理解，参考文档与当前示例可能存在入参差异，请在阅读时注意区分。

2. 调用[cryptoFramework.createSign](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#cryptoframeworkcreatesign)，指定字符串参数'RSA1024|PKCS1|SHA256|SignOnly'，创建非对称密钥类型为RSA1024、填充模式为PKCS1、摘要算法为SHA256的Sign实例，用于完成仅签名操作。

3. 调用[Sign.init](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#init-3)，使用私钥（PriKey）初始化Sign实例。

4. 调用[Sign.sign](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#sign-1)，生成数据签名。


**验签**


1. 调用[cryptoFramework.createVerify](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#cryptoframeworkcreateverify)，指定字符串参数'RSA1024|PKCS1|SHA256|Recover'，与签名的Sign实例保持一致。创建Verify实例，用于完成验签操作。

2. 调用[Verify.init](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#init-5)，使用公钥（PubKey）初始化Verify实例。

3. 调用[Verify.recover](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#recover12)，对数据进行签名恢复。

- 异步方法示例：

  ```ts
  import { cryptoFramework } from '@kit.CryptoArchitectureKit';
  import { buffer } from '@kit.ArkTS';
  // 完整的明文被拆分为input1和input2
  let input1: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from("This is Sign test plan1", 'utf-8').buffer) };
  async function signMessagePromise(priKey: cryptoFramework.PriKey) {
    let signAlg = "RSA1024|PKCS1|NoHash|OnlySign";
    let signer = cryptoFramework.createSign(signAlg);
    await signer.init(priKey);
    let signData = await signer.sign(input1);
    return signData;
  }
  async function verifyMessagePromise(signMessageBlob: cryptoFramework.DataBlob, pubKey: cryptoFramework.PubKey) {
    let verifyAlg = "RSA1024|PKCS1|NoHash|Recover";
    let verifier = cryptoFramework.createVerify(verifyAlg);
    await verifier.init(pubKey);
    let rawSignData = await verifier.recover(signMessageBlob);
    return rawSignData;
  }
  async function main() {
    let keyGenAlg = "RSA1024";
    let generator = cryptoFramework.createAsyKeyGenerator(keyGenAlg);
    let keyPair = await generator.generateKeyPair();
    let signData = await signMessagePromise(keyPair.priKey);
    let rawSignData = await verifyMessagePromise(signData, keyPair.pubKey);
    if (rawSignData != null) {
      console.info('recover result: ' + rawSignData.data);
    } else {
      console.error("get verify recover result fail!");
    }
  }
  ```

- 同步方法示例：

  ```ts
  import { cryptoFramework } from '@kit.CryptoArchitectureKit';
  import { buffer } from '@kit.ArkTS';
  // 完整的明文被拆分为input1和input2
  let input1: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from("This is Sign test plan1", 'utf-8').buffer) };
  function signMessagePromise(priKey: cryptoFramework.PriKey) {
    let signAlg = "RSA1024|PKCS1|NoHash|OnlySign";
    let signer = cryptoFramework.createSign(signAlg);
    signer.initSync(priKey);
    let signData = signer.signSync(input1);
    return signData;
  }
  function verifyMessagePromise(signMessageBlob: cryptoFramework.DataBlob, pubKey: cryptoFramework.PubKey) {
    let verifyAlg = "RSA1024|PKCS1|NoHash|Recover";
    let verifier = cryptoFramework.createVerify(verifyAlg);
    verifier.initSync(pubKey);
    let rawSignData = verifier.recoverSync(signMessageBlob);
    return rawSignData;
  }
  function main() {
    let keyGenAlg = "RSA1024";
    let generator = cryptoFramework.createAsyKeyGenerator(keyGenAlg);
    let keyPair = generator.generateKeyPairSync();
    let signData = signMessagePromise(keyPair.priKey);
    let rawSignData = verifyMessagePromise(signData, keyPair.pubKey);
    if (rawSignData != null) {
      console.info('recover result: ' + rawSignData.data);
    } else {
      console.error("get verify recover result fail!");
    }
  }
  ```