使用私钥对象获取公钥对象(ArkTS)

从API version 23开始，算法库支持从私钥对象中获取公钥对象的操作。

以RSA为例，根据私钥对象获取公钥对象。

开发步骤

调用cryptoFramework.createAsyKeyGenerator，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。
调用AsyKeyGenerator.generateKeyPair，随机生成非对称密钥对象（KeyPair）。

KeyPair对象中包括公钥PubKey、私钥PriKey。
调用PubKey.getEncoded获取KeyPair中公钥对象的二进制数据。
调用PriKey.getPubKey从私钥中获取公钥对象为PubKey。
调用PubKey.getEncoded获取PubKey对象的二进制数据。
比较两个公钥对象的二进制数据。

以异步方式生成RSA密钥对为例（调用方法getPubKey）：

import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } from '@kit.ArkTS';

function compareUint8Array(a: Uint8Array, b: Uint8Array): boolean {
  let buf1 = buffer.from(a);
  let buf2 = buffer.from(b);
  if (buf1.compare(buf2, 0, b.length, 0, a.length) == 0) {
      return true;
  } else {
      return false;
  }
}

async function prikeyGetPubKeyAsync() {
  let skData =
    new Uint8Array([48, 130, 2, 119, 2, 1, 0, 48, 13, 6, 9, 42, 134, 72, 134, 247, 13, 1, 1, 1, 5, 0, 4, 130, 2, 97, 48,
      130, 2, 93, 2, 1, 0, 2, 129, 129, 0, 199, 32, 218, 8, 4, 63, 103, 229, 64, 128, 83, 31, 23, 156, 30, 168, 101, 22,
      80, 100, 197, 243, 217, 60, 127, 110, 127, 242, 8, 251, 87, 127, 235, 38, 226, 149, 149, 108, 54, 202, 53, 1, 21,
      91, 118, 246, 97, 93, 147, 117, 162, 71, 215, 70, 9, 175, 205, 241, 230, 187, 64, 170, 154, 67, 67, 254, 71, 1,
      114, 10, 91, 195, 34, 199, 85, 172, 255, 87, 95, 159, 43, 117, 73, 73, 199, 97, 198, 117, 217, 7, 188, 196, 30,
      248, 9, 181, 150, 243, 41, 145, 91, 8, 226, 161, 251, 12, 120, 28, 36, 146, 3, 196, 48, 243, 136, 201, 207, 131,
      171, 22, 15, 7, 12, 172, 135, 196, 30, 93, 2, 3, 1, 0, 1, 2, 129, 128, 109, 100, 83, 194, 225, 170, 127, 134, 6,
      184, 56, 113, 181, 67, 179, 231, 232, 152, 168, 147, 163, 215, 193, 56, 165, 252, 235, 86, 232, 174, 67, 52, 103,
      215, 149, 212, 125, 32, 212, 188, 162, 255, 180, 94, 233, 236, 146, 50, 153, 6, 159, 158, 253, 217, 97, 10, 238,
      133, 124, 174, 211, 232, 165, 19, 100, 186, 218, 62, 46, 124, 30, 19, 251, 3, 206, 105, 255, 236, 224, 178, 148,
      103, 44, 132, 71, 83, 28, 221, 27, 189, 72, 44, 59, 253, 139, 232, 234, 14, 112, 121, 43, 142, 193, 179, 140, 200,
      97, 234, 110, 63, 205, 24, 88, 116, 86, 184, 8, 19, 254, 204, 77, 84, 66, 238, 240, 69, 72, 21, 2, 65, 0, 233,
      103, 239, 11, 215, 10, 103, 66, 46, 155, 193, 79, 37, 64, 90, 12, 167, 189, 129, 8, 131, 94, 195, 8, 210, 236, 87,
      158, 140, 2, 82, 105, 80, 253, 13, 26, 140, 202, 194, 117, 59, 57, 197, 108, 50, 20, 46, 89, 248, 132, 120, 30,
      149, 180, 135, 134, 196, 156, 160, 123, 38, 253, 15, 7, 2, 65, 0, 218, 103, 122, 117, 154, 149, 213, 110, 24, 149,
      175, 208, 136, 249, 88, 91, 89, 180, 30, 243, 69, 130, 97, 252, 177, 216, 55, 46, 67, 15, 124, 56, 113, 57, 242,
      233, 185, 193, 254, 218, 76, 165, 184, 16, 109, 190, 93, 195, 227, 37, 58, 110, 243, 142, 152, 252, 226, 91, 59,
      145, 218, 35, 106, 123, 2, 65, 0, 210, 131, 88, 58, 32, 144, 148, 131, 63, 144, 97, 112, 165, 211, 125, 164, 110,
      97, 224, 16, 50, 148, 116, 105, 239, 251, 20, 39, 190, 117, 149, 168, 193, 80, 10, 210, 136, 107, 147, 169, 178,
      106, 47, 162, 159, 36, 78, 141, 253, 52, 85, 54, 152, 165, 131, 154, 204, 151, 203, 178, 103, 126, 212, 95, 2, 65,
      0, 193, 254, 80, 3, 205, 255, 112, 200, 142, 5, 199, 88, 207, 145, 203, 45, 185, 12, 8, 193, 196, 231, 254, 233,
      89, 126, 215, 228, 187, 164, 49, 142, 96, 228, 60, 35, 230, 223, 173, 227, 113, 89, 113, 153, 6, 33, 165, 95, 173,
      143, 15, 204, 37, 130, 111, 217, 143, 165, 193, 207, 215, 150, 197, 169, 2, 64, 7, 37, 152, 14, 232, 168, 102,
      169, 167, 97, 161, 33, 86, 178, 77, 140, 12, 114, 78, 129, 47, 103, 87, 217, 177, 80, 156, 91, 240, 149, 254, 90,
      69, 232, 10, 56, 232, 63, 59, 148, 254, 101, 63, 146, 66, 96, 25, 31, 37, 154, 77, 145, 201, 213, 122, 245, 90,
      251, 219, 42, 131, 248, 148, 151
      ])
  let expectPkdata =
    new Uint8Array([48, 129, 159, 48, 13, 6, 9, 42, 134, 72, 134, 247, 13, 1, 1, 1, 5, 0, 3, 129, 141, 0, 48, 129, 137,
      2, 129, 129, 0, 199, 32, 218, 8, 4, 63, 103, 229, 64, 128, 83, 31, 23, 156, 30, 168, 101, 22, 80, 100, 197, 243,
      217, 60, 127, 110, 127, 242, 8, 251, 87, 127, 235, 38, 226, 149, 149, 108, 54, 202, 53, 1, 21, 91, 118, 246, 97,
      93, 147, 117, 162, 71, 215, 70, 9, 175, 205, 241, 230, 187, 64, 170, 154, 67, 67, 254, 71, 1, 114, 10, 91, 195,
      34, 199, 85, 172, 255, 87, 95, 159, 43, 117, 73, 73, 199, 97, 198, 117, 217, 7, 188, 196, 30, 248, 9, 181, 150,
      243, 41, 145, 91, 8, 226, 161, 251, 12, 120, 28, 36, 146, 3, 196, 48, 243, 136, 201, 207, 131, 171, 22, 15, 7, 12,
      172, 135, 196, 30, 93, 2, 3, 1, 0, 1
      ])
  let skDataBlob: cryptoFramework.DataBlob = { data: skData };
  let rsaGenerator = cryptoFramework.createAsyKeyGenerator('RSA1024');
  try {
    let keyPair = rsaGenerator.convertKeySync(null, skDataBlob);
    let priKey = keyPair.priKey;
    let pubkey = await priKey.getPubKey();
    let pkBlob = pubkey.getEncoded();
    console.info('pk1 bin data: ' + pkBlob.data);
    let ret: boolean = compareUint8Array(pkBlob.data, expectPkdata);
    console.info('result: ' + ret);
  } catch (e) {
    console.error(`get pubkey from prikey failed: errCode: ${e.code}, message: ${e.message}`);
  }
}

prikeyGetPubkeyAsync.ets

以同步方式生成RSA密钥对为例（调用方法getPubKeySync）：

import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } from '@kit.ArkTS';

function compareUint8Array(a: Uint8Array, b: Uint8Array): boolean {
  let buf1 = buffer.from(a);
  let buf2 = buffer.from(b);
  if (buf1.compare(buf2, 0, b.length, 0, a.length) == 0) {
      return true;
  } else {
      return false;
  }
}

function generateAsyKey() {
  let skData =
    new Uint8Array([48, 130, 2, 119, 2, 1, 0, 48, 13, 6, 9, 42, 134, 72, 134, 247, 13, 1, 1, 1, 5, 0, 4, 130, 2, 97, 48,
      130, 2, 93, 2, 1, 0, 2, 129, 129, 0, 199, 32, 218, 8, 4, 63, 103, 229, 64, 128, 83, 31, 23, 156, 30, 168, 101, 22,
      80, 100, 197, 243, 217, 60, 127, 110, 127, 242, 8, 251, 87, 127, 235, 38, 226, 149, 149, 108, 54, 202, 53, 1, 21,
      91, 118, 246, 97, 93, 147, 117, 162, 71, 215, 70, 9, 175, 205, 241, 230, 187, 64, 170, 154, 67, 67, 254, 71, 1,
      114, 10, 91, 195, 34, 199, 85, 172, 255, 87, 95, 159, 43, 117, 73, 73, 199, 97, 198, 117, 217, 7, 188, 196, 30,
      248, 9, 181, 150, 243, 41, 145, 91, 8, 226, 161, 251, 12, 120, 28, 36, 146, 3, 196, 48, 243, 136, 201, 207, 131,
      171, 22, 15, 7, 12, 172, 135, 196, 30, 93, 2, 3, 1, 0, 1, 2, 129, 128, 109, 100, 83, 194, 225, 170, 127, 134, 6,
      184, 56, 113, 181, 67, 179, 231, 232, 152, 168, 147, 163, 215, 193, 56, 165, 252, 235, 86, 232, 174, 67, 52, 103,
      215, 149, 212, 125, 32, 212, 188, 162, 255, 180, 94, 233, 236, 146, 50, 153, 6, 159, 158, 253, 217, 97, 10, 238,
      133, 124, 174, 211, 232, 165, 19, 100, 186, 218, 62, 46, 124, 30, 19, 251, 3, 206, 105, 255, 236, 224, 178, 148,
      103, 44, 132, 71, 83, 28, 221, 27, 189, 72, 44, 59, 253, 139, 232, 234, 14, 112, 121, 43, 142, 193, 179, 140, 200,
      97, 234, 110, 63, 205, 24, 88, 116, 86, 184, 8, 19, 254, 204, 77, 84, 66, 238, 240, 69, 72, 21, 2, 65, 0, 233,
      103, 239, 11, 215, 10, 103, 66, 46, 155, 193, 79, 37, 64, 90, 12, 167, 189, 129, 8, 131, 94, 195, 8, 210, 236, 87,
      158, 140, 2, 82, 105, 80, 253, 13, 26, 140, 202, 194, 117, 59, 57, 197, 108, 50, 20, 46, 89, 248, 132, 120, 30,
      149, 180, 135, 134, 196, 156, 160, 123, 38, 253, 15, 7, 2, 65, 0, 218, 103, 122, 117, 154, 149, 213, 110, 24, 149,
      175, 208, 136, 249, 88, 91, 89, 180, 30, 243, 69, 130, 97, 252, 177, 216, 55, 46, 67, 15, 124, 56, 113, 57, 242,
      233, 185, 193, 254, 218, 76, 165, 184, 16, 109, 190, 93, 195, 227, 37, 58, 110, 243, 142, 152, 252, 226, 91, 59,
      145, 218, 35, 106, 123, 2, 65, 0, 210, 131, 88, 58, 32, 144, 148, 131, 63, 144, 97, 112, 165, 211, 125, 164, 110,
      97, 224, 16, 50, 148, 116, 105, 239, 251, 20, 39, 190, 117, 149, 168, 193, 80, 10, 210, 136, 107, 147, 169, 178,
      106, 47, 162, 159, 36, 78, 141, 253, 52, 85, 54, 152, 165, 131, 154, 204, 151, 203, 178, 103, 126, 212, 95, 2, 65,
      0, 193, 254, 80, 3, 205, 255, 112, 200, 142, 5, 199, 88, 207, 145, 203, 45, 185, 12, 8, 193, 196, 231, 254, 233,
      89, 126, 215, 228, 187, 164, 49, 142, 96, 228, 60, 35, 230, 223, 173, 227, 113, 89, 113, 153, 6, 33, 165, 95, 173,
      143, 15, 204, 37, 130, 111, 217, 143, 165, 193, 207, 215, 150, 197, 169, 2, 64, 7, 37, 152, 14, 232, 168, 102,
      169, 167, 97, 161, 33, 86, 178, 77, 140, 12, 114, 78, 129, 47, 103, 87, 217, 177, 80, 156, 91, 240, 149, 254, 90,
      69, 232, 10, 56, 232, 63, 59, 148, 254, 101, 63, 146, 66, 96, 25, 31, 37, 154, 77, 145, 201, 213, 122, 245, 90,
      251, 219, 42, 131, 248, 148, 151
    ])
  let expectPkdata =
    new Uint8Array([48, 129, 159, 48, 13, 6, 9, 42, 134, 72, 134, 247, 13, 1, 1, 1, 5, 0, 3, 129, 141, 0, 48, 129, 137,
      2, 129, 129, 0, 199, 32, 218, 8, 4, 63, 103, 229, 64, 128, 83, 31, 23, 156, 30, 168, 101, 22, 80, 100, 197, 243,
      217, 60, 127, 110, 127, 242, 8, 251, 87, 127, 235, 38, 226, 149, 149, 108, 54, 202, 53, 1, 21, 91, 118, 246, 97,
      93, 147, 117, 162, 71, 215, 70, 9, 175, 205, 241, 230, 187, 64, 170, 154, 67, 67, 254, 71, 1, 114, 10, 91, 195,
      34, 199, 85, 172, 255, 87, 95, 159, 43, 117, 73, 73, 199, 97, 198, 117, 217, 7, 188, 196, 30, 248, 9, 181, 150,
      243, 41, 145, 91, 8, 226, 161, 251, 12, 120, 28, 36, 146, 3, 196, 48, 243, 136, 201, 207, 131, 171, 22, 15, 7, 12,
      172, 135, 196, 30, 93, 2, 3, 1, 0, 1
    ])
  let skDataBlob: cryptoFramework.DataBlob = { data: skData };
  let rsaGenerator = cryptoFramework.createAsyKeyGenerator('RSA1024');
  try {
    let keyPair = rsaGenerator.convertKeySync(null, skDataBlob);
    let priKey = keyPair.priKey;
    let pubkey = priKey.getPubKeySync();
    let pkBlob = pubkey.getEncoded();
    console.info('pk1 bin data: ' + pkBlob.data);
    let ret: boolean = compareUint8Array(pkBlob.data, expectPkdata);
    console.info('result: ' + ret);
  } catch (e) {
    console.error(`get pubkey from prikey failed: errCode: ${e.code}, message: ${e.message}`);
  }
}

prikeyGetPubKeySync.ets