Question

我正在使用AngularJS应用程序中用Java开发的服务。此服务返回RSA公钥的字节。我需要通过JavaScript中的字节装入密钥。总而言之，我需要在JavaScript中用Java完成以下操作：

 public static PublicKey loadPublicKey(String stored){
    byte[] data = Base64.decode(stored);
    X509EncodedKeySpec spec = new X509EncodedKeySpec(data);
    KeyFactory fact = KeyFactory.getInstance("RSA");
    return fact.generatePublic(spec);
}

有人能帮助我吗？

Answer 1

您可以使用标准javascript WebCryptographyApi 导入公钥进行加密或验证签名。您需要根据预期的密钥用法设置算法和允许的操作。

<强>加密

//Convert the public key in base 64 (DER encoded) to array buffer
var publicKeyAB = str2ab(atob(publicKeyB64)); 

//import key to encrypt with RSA-OAEP   
crypto.subtle.importKey(
     "spki",    
      publicKeyAB, 
      { name: "RSA-OAEP", hash: {name: "SHA-256"}}, 
      false,
      ["encrypt"])
.then(function(key){
    //do something with the key               
}).catch(function(err) {
    console.log(err );
});

验证签名

//Convert the public key in base 64 (DER encoded) to array buffer
var publicKeyAB = str2ab(atob(publicKeyB64)); 

//import the key to verify RSA signature with SHA 256
crypto.subtle.importKey(
     "spki",    
      publicKeyAB, 
      {name: 'RSASSA-PKCS1-v1_5', hash: { name: 'SHA-256'  }}, 
      false,
      ["verify"])
.then(function(key){
    //do something with the key               
}).catch(function(err) {
    console.log(err );
});

效用函数

function str2ab(str) {
  var arrBuff = new ArrayBuffer(str.length);
  var bytes = new Uint8Array(arrBuff);
  for (var iii = 0; iii < str.length; iii++) {
    bytes[iii] = str.charCodeAt(iii);
  }
  return bytes;
}

查看更多示例here

如何使用JavaScript从字节加载PublicKey RSA

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