创建RSA-SHA1签名 [英] Create RSA-SHA1 signature
本文介绍了创建RSA-SHA1签名的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
是否可以使用存储在Azure Key Vault中的X509证书创建RSA-SHA1签名? [不可抵赖证书]
Is it possible to create a RSA-SHA1 signature with a X509-certificate stored in Azure Key Vault? [non-repudiation certificate]
不幸的是，我无法将哈希算法更改为SHA256或更安全的名称，并且确实需要将证书存储在Azure Key Vault中作为密钥.
Unfortunately, I can't change the hash-algorithm to SHA256 or something safer, and I really need to store the certficate in Azure Key Vault as Key.
到目前为止，我已经尝试过
So far I've tried
await kvClient.SignAsync(keyVaultUrl, "RSNULL", digest); // digest = 20byte SHA1
await kvClient.SignAsync(keyVaultUrl, "RSNULL", ans1Digest); // asn1Digest = 35byte SHA1 wrapped in ANS1 structure
签名长度似乎正确(256字节)，但是验证失败(在具有正确实施签名验证实现的节点上).
The signature length seems to be correct (256 bytes), but verification fails (on a node with a correctly implemented signature-verification implementation).
我还尝试过像这样(使用keyVault.EncryptAsync)手动实现签名算法:
I've also tried to implement the signature-algorithm manually like this (using keyVault.EncryptAsync):
- 数据>>计算SHA1摘要
- 将SHA1摘要包裹在ASN.1结构中(连同SHA1对象标识符一起)
- 填充ANS.1结构，以便摘要与证书的密钥长度匹配
- 使用RSA1_5 >>签名对填充的ANS1.structure进行加密
我一定做错了.不确定是否需要所有步骤.
I must be doing something wrong. Not sure if all steps are needed.
如果Microsoft的任何人都读过此书.即使认为SHA1签名不安全，也可以实现它吗?漂亮，请在上面放糖:-)
推荐答案
我一针见血的专业"意见是，您没有正确构建PKCS#1 DigestInfo结构.以下控制台应用程序对SHA1和SHA256算法都适用(对其他算法没有进行测试):
My blindly shot "professional" opinion is that you are not constructring PKCS#1 DigestInfo structure correctly. Following console application is working fine for me with both SHA1 and SHA256 algorithms (didn't test the others):
using System;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Azure.KeyVault;
using Microsoft.IdentityModel.Clients.ActiveDirectory;
namespace AzureKeyVaultTestApp1
{
static class Program
{
static HashAlgorithmName _hashAlg = HashAlgorithmName.SHA1;
static string _clientId = "00000000-0000-0000-0000-000000000000";
static string _clientSecret = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
static string _certId = "https://XXXXXXXX.vault.azure.net/certificates/TestCert1/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
static string _keyId = "https://XXXXXXXX.vault.azure.net/keys/TestCert1/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
static async Task<string> AuthenticationCallback(string authority, string resource, string scope)
{
var context = new AuthenticationContext(authority);
var result = await context.AcquireTokenAsync(resource, new ClientCredential(_clientId, _clientSecret));
return result.AccessToken;
}
static async Task Main(string[] args)
{
KeyVaultClient client = new KeyVaultClient(new KeyVaultClient.AuthenticationCallback(AuthenticationCallback));
// Compute digest of data
byte[] dataToSign = Encoding.ASCII.GetBytes("Hello world!");
byte[] hash = HashAlgorithm.Create(_hashAlg.Name).ComputeHash(dataToSign);
// Construct DER encoded PKCS#1 DigestInfo structure defined in RFC 8017
byte[] pkcs1DigestInfo = CreatePkcs1DigestInfo(hash, _hashAlg);
// Sign digest with private key
var keyOperationResult = await client.SignAsync(_keyId, "RSNULL", pkcs1DigestInfo).ConfigureAwait(false);
byte[] signature = keyOperationResult.Result;
// Get public key from certificate
var certBundle = await client.GetCertificateAsync(_certId).ConfigureAwait(false);
X509Certificate2 cert = new X509Certificate2(certBundle.Cer);
RSA rsaPubKey = cert.GetRSAPublicKey();
// Verify digest signature with public key
if (!rsaPubKey.VerifyHash(hash, signature, _hashAlg, RSASignaturePadding.Pkcs1))
throw new Exception("Invalid signature");
}
private static byte[] CreatePkcs1DigestInfo(byte[] hash, HashAlgorithmName hashAlgorithm)
{
if (hash == null || hash.Length == 0)
throw new ArgumentNullException(nameof(hash));
byte[] pkcs1DigestInfo = null;
if (hashAlgorithm == HashAlgorithmName.MD5)
{
if (hash.Length != 16)
throw new ArgumentException("Invalid lenght of hash value");
pkcs1DigestInfo = new byte[] { 0x30, 0x20, 0x30, 0x0C, 0x06, 0x08, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
Array.Copy(hash, 0, pkcs1DigestInfo, pkcs1DigestInfo.Length - hash.Length, hash.Length);
}
else if (hashAlgorithm == HashAlgorithmName.SHA1)
{
if (hash.Length != 20)
throw new ArgumentException("Invalid lenght of hash value");
pkcs1DigestInfo = new byte[] { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A, 0x05, 0x00, 0x04, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
Array.Copy(hash, 0, pkcs1DigestInfo, pkcs1DigestInfo.Length - hash.Length, hash.Length);
}
else if (hashAlgorithm == HashAlgorithmName.SHA256)
{
if (hash.Length != 32)
throw new ArgumentException("Invalid lenght of hash value");
pkcs1DigestInfo = new byte[] { 0x30, 0x31, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
Array.Copy(hash, 0, pkcs1DigestInfo, pkcs1DigestInfo.Length - hash.Length, hash.Length);
}
else if (hashAlgorithm == HashAlgorithmName.SHA384)
{
if (hash.Length != 48)
throw new ArgumentException("Invalid lenght of hash value");
pkcs1DigestInfo = new byte[] { 0x30, 0x41, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
Array.Copy(hash, 0, pkcs1DigestInfo, pkcs1DigestInfo.Length - hash.Length, hash.Length);
}
else if (hashAlgorithm == HashAlgorithmName.SHA512)
{
if (hash.Length != 64)
throw new ArgumentException("Invalid lenght of hash value");
pkcs1DigestInfo = new byte[] { 0x30, 0x51, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
Array.Copy(hash, 0, pkcs1DigestInfo, pkcs1DigestInfo.Length - hash.Length, hash.Length);
}
return pkcs1DigestInfo;
}
}
}
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