使用PHP/Python验证ECDSA signatu

Question

我编写了在Android上使用spongycastle库生成ECDSA签名的代码。然后我将符号字符串和公钥发送到服务器（Ubuntu 16.04），并尝试使用php和python验证这个符号。在

我在我的android应用程序上测试验证。效果很好。在

我使用php openssl扩展，而Python则使用ecdsa0.13。但是，这两个都失败了。我再次尝试，使用openssl命令，但它也无法验证。在

我不知道我哪里错了。在

为什么ECDSA验证失败？在

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这是我的代码：

1. 生成签名（android）：

   ECNamedCurveParameterSpec spec = ECNamedCurveTable.getParameterSpec("prime256v1");
   try {
       KeyPairGenerator g = KeyPairGenerator.getInstance("ECDSA","SC");
       g.initialize(spec, new SecureRandom());
       KeyPair keyPair = g.generateKeyPair();
       privateKey = keyPair.getPrivate();
       publicKey = keyPair.getPublic();
       ///write public key to pem file
       ......
       FileOutputStream fileOutputStream1 = new FileOutputStream(file1);
       StringWriter writer1 = new StringWriter();
       PemWriter pemWriter1 = new PemWriter(writer1);
       pemWriter1.writeObject(new PemObject("PUBLIC KEY",publicKey.getEncoded()));
       pemWriter1.flush();
       pemWriter1.close();
       String publickeyPem = writer1.toString();
       fileOutputStream1.write(publickeyPem.getBytes());
       fileOutputStream1.close();
       } catch (Exception e) {
           e.printStackTrace();}
       ......
       //Sign and veryfied
        String chuoi = txtChuoi.getText().toString();
        byte[] chuoiInput = chuoi.getBytes("UTF-8");
        Signature sig = Signature.getInstance("NONEwithECDSA","SC");
        sig.initSign(privateKey);
        sig.update(chuoiInput);
        ///SIGN
        byte[] signatureBytes = sig.sign()
        txtMaHoa.setText(Base64.encodeToString(signatureBytes,Base64.DEFAULT));
        sig.initVerify(publicKey);
        sig.update(chuoiInput);
        ///VERIFIED
        txtGiaiMa.setText(sig.verify(signatureBytes)+"");
        ///Write string sign in txtMahoa to file
        .......
   

2. 我有签名和公钥的输出是：

   ^{pr2}$

   （公钥）

   -----BEGIN PUBLIC KEY-----
   MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEj07XEM+ulPyrdsfAf9prN2L2dNUd /Yy0rABcFdueAwYUf86f8Cc93Ws6sxzIvf2iKOapFby7EjHewjhLM/z7Qg==
    -----END PUBLIC KEY-----
   

3. 使用PHP验证：

   在

   $pubkeyid = openssl_pkey_get_public("/var/www/html/ca.pem");
   
   $data = "nguyen tran thanh Lam";
   
    $signature =
     "MEYCIQC7Hz631IFGsUOogcRLeN99uM9hWgLr+LGzuJvR/6nBrgIhAMXgZcvXyMRCAELXlNNS1a9jiAT1x0q2C5Mdu+2aZKtN";
   $ok = openssl_verify($data, $signature, $pubkeyid);
   if ($ok == 1) {
   echo "good";
   } elseif ($ok == 0) {
      echo "bad";
   } else {
   echo "ugly, error checking signature";
   }
   ?>
   

Answer 1

Comment: ... but the verify function don't return anything. So I not sure

如果crypto.verify(...不抛出错误，这意味着Verify正常。请参阅下面的更新代码。
使用错误的证书、签名或数据进行验证。在

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Comment: what do you think about add base64.b64decode. ... because in android code I have this linetxtMaHoa.setText(Base64.encodeToString(signatureBytes,Ba‌​se64.DEFAULT));

PEM已经是base64，检查上面的.setText(Base64...是否可以省略。现在我用base64.b64decode更新了下面的代码。在

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Question: Example b"sha256"? "b" is a binary (built-in funtion or I must convert string sha256 to binary?)

我只能用字符串（digest-names），例如：

import pem, base64
from OpenSSL import crypto

signature  = b"MEYCIQC7Hz631IFGsUOogcRLeN99uM9hWgLr+LGzuJvR/6nBrgIhAMXgZcvXyMRCAELXlNNS1a9jiAT1x0q2C5Mdu+2aZKtN"

# As Creator of the Signatur do additional base64 encoding!
signature = base64.b64decode(signature)

data = "nguyen tran thanh Lam"

certificate = pem.parse_file('Android.pem')[0]
cert = crypto.load_certificate(crypto.FILETYPE_PEM, certificate.as_bytes())

try:
    crypto.verify(cert=cert, signature=signature, data=data, digest='sha256')
except crypto.Error as exp:
    print('crypto.Error:{}'.format(exp.args))

>>>crypto.Error:([('', 'ECDSA_do_verify', 'bad signature')],)

Note: Throws crypto.Error because not using the certificate which created the signature.

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OpenSSL.crypto.verify(certificate, signature, data, digest)

Verify the signature for a data string.
certificate is a X509 instance corresponding to the private key which generated the signature.
signature is a str instance giving the signature itself.
data is a str instance giving the data to which the signature applies.
digest is a str instance naming the message digest type of the signature, for example b"sha256".

New in version 0.11.