Android/Python如何验证签名SHA256withRSA和PKCS1填充?
在Android和Python中,可以使用相应的库和方法来验证签名SHA256withRSA和PKCS1填充。下面是详细的步骤和代码示例:
在Android中:
下面是一个示例代码:
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.Signature;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Base64;
public class SignatureVerifier {
public static boolean verifySignature(String signature, String data, String certificate) {
try {
// 解码签名数据和原始数据
byte[] signatureBytes = Base64.getDecoder().decode(signature);
byte[] dataBytes = Base64.getDecoder().decode(data);
// 加载公钥证书
CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
X509Certificate x509Certificate = (X509Certificate) certificateFactory.generateCertificate(new ByteArrayInputStream(Base64.getDecoder().decode(certificate)));
// 验证签名
Signature sig = Signature.getInstance("SHA256withRSA");
sig.initVerify(x509Certificate.getPublicKey());
sig.update(dataBytes);
return sig.verify(signatureBytes);
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
}
在Python中:
下面是一个示例代码:
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.hazmat.primitives.serialization import load_pem_public_key
import base64
def verify_signature(signature, data, certificate):
try:
# 解码签名数据和原始数据
signature_bytes = base64.b64decode(signature)
data_bytes = base64.b64decode(data)
# 加载公钥证书
public_key = load_pem_public_key(certificate.encode())
# 验证签名
public_key.verify(
signature_bytes,
data_bytes,
padding.PKCS1v15(),
hashes.SHA256()
)
return True
except Exception as e:
print(e)
return False
请注意,以上代码示例仅为演示如何验证签名SHA256withRSA和PKCS1填充,实际使用时需要根据具体情况进行适当的修改和错误处理。
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