使用PHP/Python验证ECDSA签名

Question

我使用 spongycastle 库编写代码以在 Android 上生成 ECDSA 签名。然后我将签名字符串和 public-key 发送到服务器 (Ubuntu 16.04) 并尝试使用 php 和 python 来验证这个签名。

我在我的 android 应用程序上进行测试验证。效果很好。

我使用 php-openssl 扩展，Python 我使用 ecdsa 0.13。但是，这两个都失败了。我再试一次，使用openssl命令，它也无法验证。

我不知道，我哪里错了。

为什么ECDSA验证失败？

这是我的代码：

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
     .......

我有签名和public密钥的输出是：

(Signature string) MEYCIQC7Hz631IFGsUOogcRLeN99uM9hWgLr+LGzuJvR/6nBrgIhAMXgZcvXyMRCAELXlNNS1a9j iAT1x0q2C5Mdu+2aZKtN

（公钥）

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

使用PHP验证：

$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(...没有抛出错误，这意味着验证成功。请参阅下面更新的代码。
使用错误的证书、签名或数据进行验证。

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

PEM已经是base64，检查上面的.setText(Base64...是否可以省略。现在我已经用 base64.b64decode.

更新了下面的代码

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

仅适用于我的字符串 (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.

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.

使用PHP/Python验证ECDSA签名

Using PHP/Python to verify ECDSA signature

php

python

android

php-openssl

boringssl