/// <summary>
/// Open an existing RSA CSP
/// </summary>
/// <param name="providerName">Name of the provider</param>
/// <param name="containerName">Name of container</param>
/// <exception cref="Win32Exception"/>
/// <returns>Handle to the crypt provider</returns>
private CryptoApiMethods.SafeCryptProviderHandle OpenRSAProvider(string providerName, string containerName)
{
CryptoApiMethods.SafeCryptProviderHandle hCryptProv;
if (!CryptoApiMethods.CryptAcquireContext(out hCryptProv, containerName, providerName, CryptoApiMethods.Providers.PROV_RSA_FULL, 0))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
if (hCryptProv == null)
{
throw new CryptographicException();
}
return(hCryptProv);
}
/// <summary>
/// Encode an arbitary crypto object
/// </summary>
/// <param name="objName">OID for the encoding</param>
/// <param name="obj">The object to encode</param>
/// <exception cref="Win32Exception"/>
/// <returns>The encoded object</returns>
private byte[] EncodeObject(string objName, object obj)
{
byte[] ret = new byte[0];
uint cbEncoded = 0;
IntPtr pStruct = Marshal.AllocHGlobal(Marshal.SizeOf(obj));
bool bCreatedStruct = false;
try
{
Marshal.StructureToPtr(obj, pStruct, false);
bCreatedStruct = true;
if (!CryptoApiMethods.CryptEncodeObject(CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
objName, pStruct, null, ref cbEncoded))
{
int err = Marshal.GetLastWin32Error();
// If not the error for needing more data
if (err != 234)
{
throw new Win32Exception(err);
}
}
ret = new byte[cbEncoded];
if (!CryptoApiMethods.CryptEncodeObject(CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
objName, pStruct, ret, ref cbEncoded))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
finally
{
if (bCreatedStruct)
{
Marshal.DestroyStructure(pStruct, obj.GetType());
}
if (pStruct != IntPtr.Zero)
{
Marshal.FreeHGlobal(pStruct);
}
}
return(ret);
}
/// <summary>
/// Hash public key info of a specified RSA key
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
private byte[] HashPublicKeyInfo(RSACryptoServiceProvider key)
{
CryptoApiMethods.SafeCryptProviderHandle hProv = new CryptoApiMethods.SafeCryptProviderHandle();
IntPtr publicKeyInfoPtr = IntPtr.Zero;
byte[] ret = null;
uint len = 0;
try
{
publicKeyInfoPtr = ExportPublicKeyInfo(key);
CryptoApiMethods.CERT_PUBLIC_KEY_INFO publicKeyInfo = (CryptoApiMethods.CERT_PUBLIC_KEY_INFO)Marshal.PtrToStructure(publicKeyInfoPtr, typeof(CryptoApiMethods.CERT_PUBLIC_KEY_INFO));
hProv = OpenRSAProvider(key.CspKeyContainerInfo.ProviderName, key.CspKeyContainerInfo.KeyContainerName);
if (!CryptoApiMethods.CryptHashPublicKeyInfo(hProv, 0, 0, CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
publicKeyInfo, null, out len))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
ret = new byte[len];
if (!CryptoApiMethods.CryptHashPublicKeyInfo(hProv, 0, 0, CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
publicKeyInfo, ret, out len))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
finally
{
if (!hProv.IsInvalid)
{
hProv.Close();
}
if (publicKeyInfoPtr != IntPtr.Zero)
{
Marshal.FreeHGlobal(publicKeyInfoPtr);
}
}
return(ret);
}
/// <summary>
/// Encode and sign a CERT_INFO structure
/// </summary>
/// <param name="hProv"></param>
/// <param name="certInfo"></param>
/// <param name="signature">True encodes with a AT_SIGNATURE key, otherwise AT_EXCHANGE</param>
/// <param name="hashAlgorithm"></param>
/// <returns></returns>
private byte[] EncodeAndSignCertInfo(CryptoApiMethods.SafeCryptProviderHandle hProv, CryptoApiMethods.CERT_INFO certInfo, bool signature, CertificateHashAlgorithm hashAlgorithm)
{
CryptoApiMethods.CALG keyType = signature ? CryptoApiMethods.CALG.AT_SIGNATURE : CryptoApiMethods.CALG.AT_KEYEXCHANGE;
byte[] ret = null;
uint certLen = 0;
IntPtr certInfoPtr = IntPtr.Zero;
CryptoApiMethods.CRYPT_ALGORITHM_IDENTIFIER SignatureAlgorithm = new CryptoApiMethods.CRYPT_ALGORITHM_IDENTIFIER();
//SignatureAlgorithm.pszObjId = CryptoApiMethods.szOID_OIWSEC_sha1RSASign;
//SignatureAlgorithm.pszObjId = CryptoApiMethods.szOID_RSA_SHA1RSA;
//SignatureAlgorithm.pszObjId = CryptoApiMethods.szOID_RSA_SHA512RSA;
SignatureAlgorithm.pszObjId = HashAlgorithmToOID(hashAlgorithm);
try
{
certInfoPtr = Marshal.AllocHGlobal(Marshal.SizeOf(certInfo));
Marshal.StructureToPtr(certInfo, certInfoPtr, false);
if (!CryptoApiMethods.CryptSignAndEncodeCertificate(hProv, keyType, CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
new IntPtr((int)CryptoApiMethods.StructType.X509_CERT_TO_BE_SIGNED), certInfoPtr, SignatureAlgorithm, IntPtr.Zero, null, ref certLen))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
ret = new byte[certLen];
if (!CryptoApiMethods.CryptSignAndEncodeCertificate(hProv, keyType, CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
new IntPtr((int)CryptoApiMethods.StructType.X509_CERT_TO_BE_SIGNED), certInfoPtr, SignatureAlgorithm, IntPtr.Zero, ret, ref certLen))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
finally
{
Marshal.DestroyStructure(certInfoPtr, certInfo.GetType());
Marshal.FreeHGlobal(certInfoPtr);
}
return(ret);
}
/// <summary>
/// Export the public RSA keyinfo from the current crypto provider
/// </summary>
/// <param name="hProv">Handle to the crypto provider</param>
/// <param name="signature">Set to true for AT_SIGNATURE, false for AT_KEYEXCHANGE</param>
/// <returns>An IntPtr pointing to the public key info structure</returns>
private IntPtr ExportPublicKeyInfo(CryptoApiMethods.SafeCryptProviderHandle hProv, bool signature)
{
CryptoApiMethods.CALG type = signature ? CryptoApiMethods.CALG.AT_SIGNATURE : CryptoApiMethods.CALG.AT_KEYEXCHANGE;
IntPtr ret = IntPtr.Zero;
uint infoLen = 0;
if (!CryptoApiMethods.CryptExportPublicKeyInfoEx(hProv, type, CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
CryptoApiMethods.szOID_RSA_RSA, 0, IntPtr.Zero, ret, ref infoLen))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
ret = Marshal.AllocHGlobal((int)infoLen);
if (!CryptoApiMethods.CryptExportPublicKeyInfoEx(hProv, type, CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
CryptoApiMethods.szOID_RSA_RSA, 0, IntPtr.Zero, ret, ref infoLen))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
return(ret);
}
protected override bool ReleaseHandle()
{
return(CryptoApiMethods.CryptDestroyKey(handle));
}
protected override bool ReleaseHandle()
{
return(CryptoApiMethods.CryptReleaseContext(handle, 0));
}
/// <summary>
/// Export the public RSA keyinfo from the current crypto provider
/// </summary>
/// <param name="hProv">Handle to the crypto provider</param>
/// <param name="signature">Set to true for AT_SIGNATURE, false for AT_KEYEXCHANGE</param>
/// <returns>An IntPtr pointing to the public key info structure</returns>
private IntPtr ExportPublicKeyInfo(CryptoApiMethods.SafeCryptProviderHandle hProv, bool signature)
{
CryptoApiMethods.CALG type = signature ? CryptoApiMethods.CALG.AT_SIGNATURE : CryptoApiMethods.CALG.AT_KEYEXCHANGE;
IntPtr ret = IntPtr.Zero;
uint infoLen = 0;
if (!CryptoApiMethods.CryptExportPublicKeyInfoEx(hProv, type, CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
CryptoApiMethods.szOID_RSA_RSA, 0, IntPtr.Zero, ret, ref infoLen))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
ret = Marshal.AllocHGlobal((int)infoLen);
if (!CryptoApiMethods.CryptExportPublicKeyInfoEx(hProv, type, CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
CryptoApiMethods.szOID_RSA_RSA, 0, IntPtr.Zero, ret, ref infoLen))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
return ret;
}
/// <summary>
/// Encode and sign a CERT_INFO structure
/// </summary>
/// <param name="hProv"></param>
/// <param name="certInfo"></param>
/// <param name="signature">True encodes with a AT_SIGNATURE key, otherwise AT_EXCHANGE</param>
/// <param name="hashAlgorithm"></param>
/// <returns></returns>
private byte[] EncodeAndSignCertInfo(CryptoApiMethods.SafeCryptProviderHandle hProv, CryptoApiMethods.CERT_INFO certInfo, bool signature, CertificateHashAlgorithm hashAlgorithm)
{
CryptoApiMethods.CALG keyType = signature ? CryptoApiMethods.CALG.AT_SIGNATURE : CryptoApiMethods.CALG.AT_KEYEXCHANGE;
byte[] ret = null;
uint certLen = 0;
IntPtr certInfoPtr = IntPtr.Zero;
CryptoApiMethods.CRYPT_ALGORITHM_IDENTIFIER SignatureAlgorithm = new CryptoApiMethods.CRYPT_ALGORITHM_IDENTIFIER();
//SignatureAlgorithm.pszObjId = CryptoApiMethods.szOID_OIWSEC_sha1RSASign;
//SignatureAlgorithm.pszObjId = CryptoApiMethods.szOID_RSA_SHA1RSA;
//SignatureAlgorithm.pszObjId = CryptoApiMethods.szOID_RSA_SHA512RSA;
SignatureAlgorithm.pszObjId = HashAlgorithmToOID(hashAlgorithm);
try
{
certInfoPtr = Marshal.AllocHGlobal(Marshal.SizeOf(certInfo));
Marshal.StructureToPtr(certInfo, certInfoPtr, false);
if (!CryptoApiMethods.CryptSignAndEncodeCertificate(hProv, keyType, CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
new IntPtr((int)CryptoApiMethods.StructType.X509_CERT_TO_BE_SIGNED), certInfoPtr, SignatureAlgorithm, IntPtr.Zero, null, ref certLen))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
ret = new byte[certLen];
if (!CryptoApiMethods.CryptSignAndEncodeCertificate(hProv, keyType, CryptoApiMethods.CertEncoding.X509_ASN_ENCODING,
new IntPtr((int)CryptoApiMethods.StructType.X509_CERT_TO_BE_SIGNED), certInfoPtr, SignatureAlgorithm, IntPtr.Zero, ret, ref certLen))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
finally
{
Marshal.DestroyStructure(certInfoPtr, certInfo.GetType());
Marshal.FreeHGlobal(certInfoPtr);
}
return ret;
}
/// <summary>
/// Encode and sign a CERT_INFO structure
/// </summary>
/// <param name="key">Key to sign the certificate with</param>
/// <param name="certInfo">The CERT_INFO structure to sign</param>
/// <param name="hashAlgorithm"></param>
/// <returns></returns>
private byte[] EncodeAndSignCertInfo(RSACryptoServiceProvider key, CryptoApiMethods.CERT_INFO certInfo, CertificateHashAlgorithm hashAlgorithm)
{
byte[] ret = null;
CryptoApiMethods.SafeCryptProviderHandle hProv = new CryptoApiMethods.SafeCryptProviderHandle();
try
{
hProv = OpenRSAProvider(key.CspKeyContainerInfo.ProviderName, key.CspKeyContainerInfo.KeyContainerName);
ret = EncodeAndSignCertInfo(hProv, certInfo, key.CspKeyContainerInfo.KeyNumber == KeyNumber.Signature ? true : false, hashAlgorithm);
}
finally
{
if (!hProv.IsInvalid)
{
hProv.Close();
}
}
return ret;
}
