//
// This returns an allocated native memory block. Its lifetime (and that of any allocated subblocks it may point to) is that of "hb".
//
private static unsafe CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO *EncodeKeyTransRecipientInfo(CmsRecipient recipient, HeapBlockRetainer hb)
{
// "recipient" is a deep-cloned CmsRecipient object whose lifetime this class controls. Because of this, we can pull out the CERT_CONTEXT* and CERT_INFO* pointers
// and embed pointers to them in the memory block we return. Yes, this code is scary.
//
// (The use of SafeCertContextHandle here is about using a consistent pattern to get the CERT_CONTEXT (rather than the ugly (CERT_CONTEXT*)(recipient.Certificate.Handle) pattern.)
// It's not about keeping the context alive.)
using (SafeCertContextHandle hCertContext = recipient.Certificate.CreateCertContextHandle())
{
CERT_CONTEXT *pCertContext = hCertContext.DangerousGetCertContext();
CERT_INFO * pCertInfo = pCertContext->pCertInfo;
CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO *pEncodeInfo = (CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO *)(hb.Alloc(sizeof(CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO)));
pEncodeInfo->cbSize = sizeof(CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO);
CRYPT_ALGORITHM_IDENTIFIER algId = pCertInfo->SubjectPublicKeyInfo.Algorithm;
pEncodeInfo->KeyEncryptionAlgorithm = algId;
pEncodeInfo->pvKeyEncryptionAuxInfo = IntPtr.Zero;
pEncodeInfo->hCryptProv = IntPtr.Zero;
pEncodeInfo->RecipientPublicKey = pCertInfo->SubjectPublicKeyInfo.PublicKey;
pEncodeInfo->RecipientId = EncodeRecipientId(recipient, hCertContext, pCertContext, pCertInfo, hb);
return(pEncodeInfo);
}
}
//
// This returns an allocated native memory block. Its lifetime (and that of any allocated subblocks it may point to) is that of "hb".
//
private static unsafe CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO *EncodeKeyTransRecipientInfo(CmsRecipient recipient, HeapBlockRetainer hb)
{
// "recipient" is a deep-cloned CmsRecipient object whose lifetime this class controls. Because of this, we can pull out the CERT_CONTEXT* and CERT_INFO* pointers
// and embed pointers to them in the memory block we return. Yes, this code is scary.
//
// (The use of SafeCertContextHandle here is about using a consistent pattern to get the CERT_CONTEXT (rather than the ugly (CERT_CONTEXT*)(recipient.Certificate.Handle) pattern.)
// It's not about keeping the context alive.)
using (SafeCertContextHandle hCertContext = recipient.Certificate.CreateCertContextHandle())
{
CERT_CONTEXT *pCertContext = hCertContext.DangerousGetCertContext();
CERT_INFO * pCertInfo = pCertContext->pCertInfo;
CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO *pEncodeInfo = (CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO *)(hb.Alloc(sizeof(CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO)));
pEncodeInfo->cbSize = sizeof(CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO);
if (recipient.RSAEncryptionPadding is null)
{
CRYPT_ALGORITHM_IDENTIFIER algId = pCertInfo->SubjectPublicKeyInfo.Algorithm;
pEncodeInfo->KeyEncryptionAlgorithm = algId;
}
else if (recipient.RSAEncryptionPadding == RSAEncryptionPadding.Pkcs1)
{
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(Oids.Rsa);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = (uint)s_rsaPkcsParameters.Length;
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(s_rsaPkcsParameters);
}
else if (recipient.RSAEncryptionPadding == RSAEncryptionPadding.OaepSHA1)
{
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(Oids.RsaOaep);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = (uint)s_rsaOaepSha1Parameters.Length;
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(s_rsaOaepSha1Parameters);
}
else if (recipient.RSAEncryptionPadding == RSAEncryptionPadding.OaepSHA256)
{
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(Oids.RsaOaep);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = (uint)s_rsaOaepSha256Parameters.Length;
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(s_rsaOaepSha256Parameters);
}
else if (recipient.RSAEncryptionPadding == RSAEncryptionPadding.OaepSHA384)
{
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(Oids.RsaOaep);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = (uint)s_rsaOaepSha384Parameters.Length;
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(s_rsaOaepSha384Parameters);
}
else if (recipient.RSAEncryptionPadding == RSAEncryptionPadding.OaepSHA512)
{
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(Oids.RsaOaep);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = (uint)s_rsaOaepSha512Parameters.Length;
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(s_rsaOaepSha512Parameters);
}
else
{
throw ErrorCode.CRYPT_E_UNKNOWN_ALGO.ToCryptographicException();
}
pEncodeInfo->pvKeyEncryptionAuxInfo = IntPtr.Zero;
pEncodeInfo->hCryptProv = IntPtr.Zero;
pEncodeInfo->RecipientPublicKey = pCertInfo->SubjectPublicKeyInfo.PublicKey;
pEncodeInfo->RecipientId = EncodeRecipientId(recipient, hCertContext, pCertContext, pCertInfo, hb);
return(pEncodeInfo);
}
}
//
// This returns an allocated native memory block. Its lifetime (and that of any allocated subblocks it may point to) is that of "hb".
//
private static unsafe CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO *EncodeKeyTransRecipientInfo(CmsRecipient recipient, HeapBlockRetainer hb)
{
// "recipient" is a deep-cloned CmsRecipient object whose lifetime this class controls. Because of this, we can pull out the CERT_CONTEXT* and CERT_INFO* pointers
// and embed pointers to them in the memory block we return. Yes, this code is scary.
//
// (The use of SafeCertContextHandle here is about using a consistent pattern to get the CERT_CONTEXT (rather than the ugly (CERT_CONTEXT*)(recipient.Certificate.Handle) pattern.)
// It's not about keeping the context alive.)
using (SafeCertContextHandle hCertContext = recipient.Certificate.CreateCertContextHandle())
{
CERT_CONTEXT *pCertContext = hCertContext.DangerousGetCertContext();
CERT_INFO * pCertInfo = pCertContext->pCertInfo;
CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO *pEncodeInfo = (CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO *)(hb.Alloc(sizeof(CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO)));
pEncodeInfo->cbSize = sizeof(CMSG_KEY_TRANS_RECIPIENT_ENCODE_INFO);
RSAEncryptionPadding padding = recipient.RSAEncryptionPadding;
if (padding is null)
{
if (recipient.Certificate.GetKeyAlgorithm() == Oids.RsaOaep)
{
byte[] parameters = recipient.Certificate.GetKeyAlgorithmParameters();
if (parameters == null || parameters.Length == 0)
{
padding = RSAEncryptionPadding.OaepSHA1;
}
else if (!PkcsHelpers.TryGetRsaOaepEncryptionPadding(parameters, out padding, out _))
{
throw ErrorCode.CRYPT_E_UNKNOWN_ALGO.ToCryptographicException();
}
}
else
{
// gost falls in here
padding = RSAEncryptionPadding.Pkcs1;
}
}
if (padding == RSAEncryptionPadding.Pkcs1)
{
// begin: gost
switch (recipient.Certificate.GetKeyAlgorithm())
{
case Oids.Gost3410:
case Oids.Gost3410_2012_256:
case Oids.Gost3410_2012_512:
{
// copy from cert info explicitly
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(recipient.Certificate.GetKeyAlgorithm());
// uint, копируем
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = pCertInfo->SubjectPublicKeyInfo.Algorithm.Parameters.cbData;
// копируем из памяти и записываем
var pbDataBytes = new byte[pCertInfo->SubjectPublicKeyInfo.Algorithm.Parameters.cbData];
Marshal.Copy(pCertInfo->SubjectPublicKeyInfo.Algorithm.Parameters.pbData, pbDataBytes, 0, pbDataBytes.Length);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(pbDataBytes);
break;
}
default:
{
// end: gost
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(Oids.Rsa);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = (uint)s_rsaPkcsParameters.Length;
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(s_rsaPkcsParameters);
break;
}
}
}
else if (padding == RSAEncryptionPadding.OaepSHA1)
{
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(Oids.RsaOaep);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = (uint)s_rsaOaepSha1Parameters.Length;
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(s_rsaOaepSha1Parameters);
}
else if (padding == RSAEncryptionPadding.OaepSHA256)
{
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(Oids.RsaOaep);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = (uint)s_rsaOaepSha256Parameters.Length;
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(s_rsaOaepSha256Parameters);
}
else if (padding == RSAEncryptionPadding.OaepSHA384)
{
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(Oids.RsaOaep);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = (uint)s_rsaOaepSha384Parameters.Length;
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(s_rsaOaepSha384Parameters);
}
else if (padding == RSAEncryptionPadding.OaepSHA512)
{
pEncodeInfo->KeyEncryptionAlgorithm.pszObjId = hb.AllocAsciiString(Oids.RsaOaep);
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.cbData = (uint)s_rsaOaepSha512Parameters.Length;
pEncodeInfo->KeyEncryptionAlgorithm.Parameters.pbData = hb.AllocBytes(s_rsaOaepSha512Parameters);
}
else
{
throw ErrorCode.CRYPT_E_UNKNOWN_ALGO.ToCryptographicException();
}
pEncodeInfo->pvKeyEncryptionAuxInfo = IntPtr.Zero;
pEncodeInfo->hCryptProv = IntPtr.Zero;
pEncodeInfo->RecipientPublicKey = pCertInfo->SubjectPublicKeyInfo.PublicKey;
pEncodeInfo->RecipientId = EncodeRecipientId(recipient, hCertContext, pCertContext, pCertInfo, hb);
return(pEncodeInfo);
}
}
