# 指定PEM格式字符串数据转换非对称密钥对(ArkTS)


以RSA为例，根据指定的非对称密钥字符串数据，生成非对称密钥对（KeyPair）。


> **说明：**
>
> 针对非对称密钥的convertPemKey操作：
>
> - 公钥需满足：X.509规范、PKCS\#1规范、PEM编码格式。
>
> - 私钥需满足：PKCS\#8规范、PKCS\#1规范、PEM编码格式。
>
> - 当前只支持RSA非对称密钥的转换。


## 指定PEM格式字符串数据转换RSA密钥对

对应的算法规格请查看[非对称密钥生成和转换规格：RSA](crypto-asym-key-generation-conversion-spec.md#rsa)。

1. 调用[cryptoFramework.createAsyKeyGenerator](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#cryptoframeworkcreateasykeygenerator)，指定字符串参数'RSA1024'，创建RSA密钥类型为RSA1024、素数个数为2的非对称密钥生成器（AsyKeyGenerator）。

   生成RSA非对称密钥时，默认素数为2，此处省略了参数PRIMES_2。

2. 调用[AsyKeyGenerator.convertPemKey](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#convertpemkey12)，传入二进制密钥数据，生成非对称密钥对象（KeyPair）。
3. 调用[AsyKeyGenerator.getEncodedPem](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#getencodedpem12)，将非对称密钥对象中的公钥转换成pkcs1或x509格式，私钥转换成pkcs1或pkcs8格式。

- 以使用Promise方式生成RSA密钥对为例：

  ```ts
  import { cryptoFramework } from '@kit.CryptoArchitectureKit';

  let priKeyPkcs1Str1024: string  =
    "-----BEGIN RSA PRIVATE KEY-----\n"
    + "MIICXQIBAAKBgQCwIN3mr21+N96ToxnVnaS+xyK9cNRAHiHGgrbjHw6RAj3V+l+W\n"
    + "Y68IhIe3DudVlzE9oMjeOQwkMkq//HCxNlIlFR6O6pa0mrXSwPRE7YKG97CeKk2g\n"
    + "YOS8YEh8toAvm7xKbiLkXuuMlxrjP2j/mb5iI/UASFSPZiQ/IyxDr0AQaQIDAQAB\n"
    + "AoGAEvBFzBNa+7J4PXnRQlYEK/tvsd0bBZX33ceacMubHl6WVZbphltLq+fMTBPP\n"
    + "LjXmtpC+aJ7Lvmyl+wTi/TsxE9vxW5JnbuRT48rnZ/Xwq0eozDeEeIBRrpsr7Rvr\n"
    + "7ctrgzr4m4yMHq9aDgpxj8IR7oHkfwnmWr0wM3FuiVlj650CQQDineeNZ1hUTkj4\n"
    + "D3O+iCi3mxEVEeJrpqrmSFolRMb+iozrIRKuJlgcOs+Gqi2fHfOTTL7LkpYe8SVg\n"
    + "e3JxUdVLAkEAxvcZXk+byMFoetrnlcMR13VHUpoVeoV9qkv6CAWLlbMdgf7uKmgp\n"
    + "a1Yp3QPDNQQqkPvrqtfR19JWZ4uy1qREmwJALTU3BjyBoH/liqb6fh4HkWk75Som\n"
    + "MzeSjFIOubSYxhq5tgZpBZjcpvUMhV7Zrw54kwASZ+YcUJvmyvKViAm9NQJBAKF7\n"
    + "DyXSKrem8Ws0m1ybM7HQx5As6l3EVhePDmDQT1eyRbKp+xaD74nkJpnwYdB3jyyY\n"
    + "qc7A1tj5J5NmeEFolR0CQQCn76Xp8HCjGgLHw9vg7YyIL28y/XyfFyaZAzzK+Yia\n"
    + "akNwQ6NeGtXSsuGCcyyfpacHp9xy8qXQNKSkw03/5vDO\n"
    + "-----END RSA PRIVATE KEY-----\n";
  let publicPkcs1Str1024: string  =
    "-----BEGIN RSA PUBLIC KEY-----\n"
    + "MIGJAoGBALAg3eavbX433pOjGdWdpL7HIr1w1EAeIcaCtuMfDpECPdX6X5ZjrwiE\n"
    + "h7cO51WXMT2gyN45DCQySr/8cLE2UiUVHo7qlrSatdLA9ETtgob3sJ4qTaBg5Lxg\n"
    + "SHy2gC+bvEpuIuRe64yXGuM/aP+ZvmIj9QBIVI9mJD8jLEOvQBBpAgMBAAE=\n"
    + "-----END RSA PUBLIC KEY-----\n";
  async function TestPkcs1ToPkcs8ByPromise() {
    let asyKeyGenerator = cryptoFramework.createAsyKeyGenerator('RSA1024');
    let keyPair = await asyKeyGenerator.convertPemKey(publicPkcs1Str1024, priKeyPkcs1Str1024);
    let priPemKey = keyPair.priKey;
    let pubPemKey = keyPair.pubKey;
    let priString = priPemKey.getEncodedPem('PKCS8');
    let pubString = pubPemKey.getEncodedPem('X509');
    console.info("[promise]TestPkcs1ToPkcs8ByPromise priString output is " + priString);
    console.info("[promise]TestPkcs1ToPkcs8ByPromise pubString output is " + pubString);
  }
  ```

- 同步返回结果（调用方法[convertPemKeySync](../../reference/apis-crypto-architecture-kit/js-apis-cryptoFramework.md#convertpemkeysync12)）：

  ```ts
  import { cryptoFramework } from '@kit.CryptoArchitectureKit';

  let priKeyPkcs1Str1024: string  =
    "-----BEGIN RSA PRIVATE KEY-----\n"
    + "MIICXQIBAAKBgQCwIN3mr21+N96ToxnVnaS+xyK9cNRAHiHGgrbjHw6RAj3V+l+W\n"
    + "Y68IhIe3DudVlzE9oMjeOQwkMkq//HCxNlIlFR6O6pa0mrXSwPRE7YKG97CeKk2g\n"
    + "YOS8YEh8toAvm7xKbiLkXuuMlxrjP2j/mb5iI/UASFSPZiQ/IyxDr0AQaQIDAQAB\n"
    + "AoGAEvBFzBNa+7J4PXnRQlYEK/tvsd0bBZX33ceacMubHl6WVZbphltLq+fMTBPP\n"
    + "LjXmtpC+aJ7Lvmyl+wTi/TsxE9vxW5JnbuRT48rnZ/Xwq0eozDeEeIBRrpsr7Rvr\n"
    + "7ctrgzr4m4yMHq9aDgpxj8IR7oHkfwnmWr0wM3FuiVlj650CQQDineeNZ1hUTkj4\n"
    + "D3O+iCi3mxEVEeJrpqrmSFolRMb+iozrIRKuJlgcOs+Gqi2fHfOTTL7LkpYe8SVg\n"
    + "e3JxUdVLAkEAxvcZXk+byMFoetrnlcMR13VHUpoVeoV9qkv6CAWLlbMdgf7uKmgp\n"
    + "a1Yp3QPDNQQqkPvrqtfR19JWZ4uy1qREmwJALTU3BjyBoH/liqb6fh4HkWk75Som\n"
    + "MzeSjFIOubSYxhq5tgZpBZjcpvUMhV7Zrw54kwASZ+YcUJvmyvKViAm9NQJBAKF7\n"
    + "DyXSKrem8Ws0m1ybM7HQx5As6l3EVhePDmDQT1eyRbKp+xaD74nkJpnwYdB3jyyY\n"
    + "qc7A1tj5J5NmeEFolR0CQQCn76Xp8HCjGgLHw9vg7YyIL28y/XyfFyaZAzzK+Yia\n"
    + "akNwQ6NeGtXSsuGCcyyfpacHp9xy8qXQNKSkw03/5vDO\n"
    + "-----END RSA PRIVATE KEY-----\n";
  let publicPkcs1Str1024: string  =
    "-----BEGIN RSA PUBLIC KEY-----\n"
    + "MIGJAoGBALAg3eavbX433pOjGdWdpL7HIr1w1EAeIcaCtuMfDpECPdX6X5ZjrwiE\n"
    + "h7cO51WXMT2gyN45DCQySr/8cLE2UiUVHo7qlrSatdLA9ETtgob3sJ4qTaBg5Lxg\n"
    + "SHy2gC+bvEpuIuRe64yXGuM/aP+ZvmIj9QBIVI9mJD8jLEOvQBBpAgMBAAE=\n"
    + "-----END RSA PUBLIC KEY-----\n";
  function TestPkcs1ToPkcs8BySync() {
    let asyKeyGenerator = cryptoFramework.createAsyKeyGenerator('RSA1024');
    try {
      let keyPairData = asyKeyGenerator.convertPemKeySync(publicPkcs1Str1024, priKeyPkcs1Str1024);
      if (keyPairData != null) {
        console.info('[Sync]: convert pem key pair success');
      } else {
        console.error("[Sync]: convert pem key pair result fail!");
      }
      let priPemKey = keyPairData.priKey;
      let pubPemKey = keyPairData.pubKey;
      let priString = priPemKey.getEncodedPem('PKCS8');
      let pubString = pubPemKey.getEncodedPem('X509');
      console.info("[Sync]TestPkcs1ToPkcs8BySync priString output is " + priString);
      console.info("[Sync]TestPkcs1ToPkcs8BySync pubString output is " + pubString);
    } catch (e) {
      console.error(`Sync error, ${e.code}, ${e.message}`);
    }
  }
  ```