Node.js crypto.createVerify() 方法

crypto.createVerify() 方法用于创建使用所述算法的验证对象。此外，您可以使用crypto.getHashes()访问所有可用签名算法的名称。

句法：

crypto.createVerify( algorithm, options )

参数：此方法接受上面提到的两个参数，如下所述：

• algorithm：它是一个字符串类型的值。可以通过应用签名算法的名称（例如“RSA-SHA256”）代替摘要算法来创建Sign实例。
• options：它是一个可选参数，用于控制流的行为。它返回一个对象。

返回值：返回验证对象。

下面的示例说明了在 Node.js 中使用crypto.createVerify() 方法：

示例 1：

// Node.js program to demonstrate the 
// crypto.createVerify() method
  
// Including crypto module
const crypto = require('crypto');
  
// Creating verify object with its algo
const verify = crypto.createVerify('SHA256');
  
// Returns the 'Verify' object
console.log(verify);

输出：

Verify {
  _handle: {},
  _writableState:
   WritableState {
     objectMode: false,
     highWaterMark: 16384,
     finalCalled: false,
     needDrain: false,
     ending: false,
     ended: false,
     finished: false,
     destroyed: false,
     decodeStrings: true,
     defaultEncoding: 'utf8',
     length: 0,
     writing: false,
     corked: 0,
     sync: true,
     bufferProcessing: false,
     onwrite: [Function: bound onwrite],
     writecb: null,
     writelen: 0,
     bufferedRequest: null,
     lastBufferedRequest: null,
     pendingcb: 0,
     prefinished: false,
     errorEmitted: false,
     emitClose: true,
     autoDestroy: false,
     bufferedRequestCount: 0,
     corkedRequestsFree:
      { next: null,
        entry: null,
        finish: [Function: bound onCorkedFinish] } },
  writable: true,
  domain: null,
  _events: [Object: null prototype] {},
  _eventsCount: 0,
  _maxListeners: undefined }

示例 2：

// Node.js program to demonstrate the 
// crypto.createVerify() method
  
// Including crypto module
const crypto = require('crypto');
  
// Creating verify object with its algo
const verify = crypto.createVerify('SHA256');
  
// Writing data to be signed and verified
verify.write('some text to sign');
  
// Calling end method
verify.end();
  
    // Beginning public key
    const l1 = "-----BEGIN PUBLIC KEY-----\n"
      
    // Encrypted data
    const l2 =
  "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXIvPbzLjaPLd8jgiv1TL/X8PXpJNgDkGRj9U9Lcx1yKURpQFVavcMkfWyO8r7JlZNMax0JKfLZUM1IePRjHlFw=="
  
    // Ending public key
    const l3 = "\n-----END PUBLIC KEY-----"
  
    // Constructing public key
    const publicKey = l1 + l2 + l3
  
    // Signature to be verified
    const signature = "MEYCIQCPfWhpzxMqu3gZWflBm5V0aetgb2/S+SGyGcElaOjgdgIhALaD4lbxVwa8HUUBFOLz+CGvIioDkf9oihSnXHCqh8yV";
  
    // Prints true if verified else false
    console.log(verify.verify(publicKey, signature));

输出：

false

参考： https://nodejs.org/api/crypto.html#crypto_crypto_createverify_algorithm_options