[英]C# - Is it possible to Sign hash using RSA SHA512?
我使用 OpenSSL 創建了一個自簽名證書,如下所示:
openssl req -x509 -sha512 -new keyrsa:2048 -keyout key2.pem -out cert2.pem -days 100
openssl pkcs12 -export -out pkcs12_cert_test2.pfx -inkey key2.pem -in cert2.pem
我已經在 Windows 上安裝了pkcs12_cert_test2.pfx
並且證書簽名算法值為sha512RSA
然后,我在 C# .NET 4.0 中編寫了以下代碼:
public static bool DSHandler(string operation, string path, string devicePath)
{
bool result = false;
CryptoConfig.AddAlgorithm(typeof(USBSaferAppEFB.RsaPkCs1Sha512SignatureDescription),
"http://www.w3.org/2001/04/xmldsig-more#rsa-sha512");
string password = "xxxx";
bool validSignature = false;
byte[] hashchain = generateHash(path);
string digSignFile = Utils.RegVarValue(DIGSIGNFILE);
string subjectDN = Utils.RegVarValue(SUBJECTDN);
if (operation == "sign")
{
byte[] signature = SignFromContainer(hashchain, subjectDN);
if (signature != null)
{
string signaturestring = Convert.ToBase64String(signature);
File.WriteAllBytes(devicePath + digSignFile, signature);
result = true;
}
else
result = false;
}
}
static byte[] SignFromContainer(byte[] hashchain, string certSubject)
{
try
{
X509Store my = new X509Store(StoreName.My, StoreLocation.CurrentUser);
my.Open(OpenFlags.ReadOnly);
RSACryptoServiceProvider csp = null;
foreach (X509Certificate2 cert in my.Certificates)
{
if (cert.Subject.Contains(certSubject))
{
// We found it.
// Get its associated CSP and private key
csp = (RSACryptoServiceProvider)cert.PrivateKey;
}
}
if (csp == null)
{
return null;
}
byte[] myHash = { 59,4,248,102,77,97,142,201,
210,12,224,93,25,41,100,197,
210,12,224,93};
// Sign the hash
return csp.SignHash(hashchain, CryptoConfig.MapNameToOID("SHA-512"));
}
catch (Exception e)
{
log.Logger("Exception: "+e.Message, "debug");
log.Logger(e.StackTrace, "debug");
return null;
}
}
使用一些文章和答案中的解決方案,我有RsaPkCs1Sha512SignatureDescription
類,我嘗試實現和注冊簽名描述:
public class RsaPkCs1Sha512SignatureDescription : SignatureDescription
{
public RsaPkCs1Sha512SignatureDescription()
{
KeyAlgorithm = typeof(RSACryptoServiceProvider).FullName;
DigestAlgorithm = typeof(SHA512Managed).FullName;
FormatterAlgorithm = typeof(RSAPKCS1SignatureFormatter).FullName;
DeformatterAlgorithm = typeof(RSAPKCS1SignatureDeformatter).FullName;
}
public override AsymmetricSignatureDeformatter CreateDeformatter(AsymmetricAlgorithm key)
{
var sigProcessor = (AsymmetricSignatureDeformatter)CryptoConfig.CreateFromName(DeformatterAlgorithm);
sigProcessor.SetKey(key);
sigProcessor.SetHashAlgorithm("SHA-512");
return sigProcessor;
}
public override AsymmetricSignatureFormatter CreateFormatter(AsymmetricAlgorithm key)
{
var sigProcessor =
(AsymmetricSignatureFormatter)CryptoConfig.CreateFromName(FormatterAlgorithm);
sigProcessor.SetKey(key);
sigProcessor.SetHashAlgorithm("SHA-512");
return sigProcessor;
}
}
我已經驗證哈希是64
字節長,它返回一個CryptographicException: Bad Hash
。 但是,如果我使用myHash
var(20 字節長),雖然SignHash
指定的算法是SHA512
,但它可以工作,並使用SHA1
算法對哈希進行簽名。
另外,如果我打印csp.SignatureAlgorithm
,它的值是http://www.w3.org/2000/09/xmldsig#rsa-sha1 。 如果已安裝證書的詳細信息顯示sha512RSA
作為簽名算法,為什么簽名算法等於http://www.w3.org/2000/09/xmldsig#rsa-sha1 ? 這可能是真正的問題嗎? 如果是這樣,我該如何正確創建證書? 提前致謝!
此過程已在 .NET 4.6 中簡化:
byte[] signature;
using (RSA rsa = cert.GetRSAPrivateKey())
{
signature = rsa.SignHash(hash, HashAlgorithmName.SHA512, RSASignaturePadding.Pkcs1);
}
請注意,.NET 4.6 RSA 類型不再需要轉換為 RSACryptoServiceProvider,並且如果您使用 GetRSAPrivateKey()(而不是 PrivateKey 屬性),則返回的對象可能會處理 SHA-512 簽名生成。 GetRSAPrivateKey 每次也返回一個唯一的對象,因此您應該適當地處理它。
好的。 沒有必要實現RsaPkCs1Sha512SignatureDescription
類或類似的東西,但要指定正確的 CSP 以允許 CryptoAPI 使用 SHA256 或 SHA512:“Microsoft Enhanced RSA and AES Cryptographic Provider”,類型 24。
我們只需要將 CSP 類型作為 CspParameter 並導出/導入密鑰信息:
byte[] privateKeyBlob;
CspParameters cp = new CspParameters(24);
RSACryptoServiceProvider csp = (RSACryptoServiceProvider)cert.PrivateKey;
privateKeyBlob = csp.ExportCspBlob(true);
csp = new RSACryptoServiceProvider(cp);
csp.ImportCspBlob(privateKeyBlob);
// Sign the hash
return csp.SignHash(hashchain, CryptoConfig.MapNameToOID("SHA-512"));
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