private AsnWriter WritePkcs8()
{
PrivateKeyInfoAsn info = new PrivateKeyInfoAsn
{
PrivateKeyAlgorithm =
{
Algorithm = AlgorithmId,
},
PrivateKey = PrivateKeyBytes,
};
if (AlgorithmParameters?.Length > 0)
{
info.PrivateKeyAlgorithm.Parameters = AlgorithmParameters;
}
if (Attributes.Count > 0)
{
info.Attributes = PkcsHelpers.NormalizeAttributeSet(CmsSigner.BuildAttributes(Attributes).ToArray());
}
// Write in BER in case any of the provided fields was BER.
AsnWriter writer = new AsnWriter(AsnEncodingRules.BER);
info.Encode(writer);
return(writer);
}
public bool MatchesCertificate(X509Certificate2 certificate)
{
switch (Type)
{
case SubjectIdentifierType.IssuerAndSerialNumber:
{
X509IssuerSerial issuerSerial = (X509IssuerSerial)Value;
byte[] serialNumber = issuerSerial.SerialNumber.ToSerialBytes();
string issuer = issuerSerial.IssuerName;
byte[] certSerialNumber = certificate.GetSerialNumber();
return(PkcsHelpers.AreByteArraysEqual(certSerialNumber, serialNumber) && certificate.Issuer == issuer);
}
case SubjectIdentifierType.SubjectKeyIdentifier:
{
string skiString = (string)Value;
byte[] ski = skiString.ToSkiBytes();
byte[] candidateSki = PkcsPal.Instance.GetSubjectKeyIdentifier(certificate);
return(PkcsHelpers.AreByteArraysEqual(ski, candidateSki));
}
default:
// SubjectIdentifier can only be created by this package so if this an invalid type, it's the package's fault.
Debug.Fail($"Invalid SubjectIdentifierType: {Type}");
throw new CryptographicException();
}
}
private bool VerifyData(ReadOnlySpan <byte> data)
{
Oid hashAlgorithmId = TokenInfo.HashAlgorithmId;
HashAlgorithmName hashAlgorithmName = PkcsHelpers.GetDigestAlgorithm(hashAlgorithmId);
using (IncrementalHash hasher = IncrementalHash.CreateHash(hashAlgorithmName))
{
hasher.AppendData(data);
// SHA-2-512 is the biggest hash we currently know about.
Span <byte> stackSpan = stackalloc byte[512 / 8];
if (hasher.TryGetHashAndReset(stackSpan, out int bytesWritten))
{
return(VerifyHash(stackSpan.Slice(0, bytesWritten), hashAlgorithmId.Value));
}
// Something we understood, but is bigger than 512-bit.
// Allocate at runtime, trip in a debug build so we can re-evaluate this.
Debug.Fail(
$"TryGetHashAndReset did not fit in {stackSpan.Length} for hash {hashAlgorithmId.Value}");
return(VerifyHash(hasher.GetHashAndReset(), hashAlgorithmId.Value));
}
}
internal Pkcs12SafeContents(ContentInfoAsn contentInfoAsn)
{
IsReadOnly = true;
switch (contentInfoAsn.ContentType)
{
case Oids.Pkcs7Encrypted:
ConfidentialityMode = Pkcs12ConfidentialityMode.Password;
_encrypted = contentInfoAsn.Content;
break;
case Oids.Pkcs7Enveloped:
ConfidentialityMode = Pkcs12ConfidentialityMode.PublicKey;
_encrypted = contentInfoAsn.Content;
break;
case Oids.Pkcs7Data:
ConfidentialityMode = Pkcs12ConfidentialityMode.None;
_bags = ReadBags(PkcsHelpers.DecodeOctetStringAsMemory(contentInfoAsn.Content));
break;
default:
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
}
public byte[] Encode()
{
if (!_hasData)
{
throw new InvalidOperationException(SR.Cryptography_Cms_MessageNotSigned);
}
return(PkcsHelpers.EncodeContentInfo(_signedData, Oids.Pkcs7Signed));
}
public X509Certificate2 GetCertificate()
{
if (!IsX509Certificate)
{
throw new InvalidOperationException(SR.Cryptography_Pkcs12_CertBagNotX509);
}
return(new X509Certificate2(PkcsHelpers.DecodeOctetString(_decoded.CertValue)));
}
//
// Private methods.
//
private static DateTime Decode(byte[]?rawData)
{
if (rawData == null)
{
return(default(DateTime));
}
return(PkcsHelpers.DecodeUtcTime(rawData));
}
public sealed unsafe override byte[] Encrypt(CmsRecipientCollection recipients, ContentInfo contentInfo, AlgorithmIdentifier contentEncryptionAlgorithm, X509Certificate2Collection originatorCerts, CryptographicAttributeObjectCollection unprotectedAttributes)
{
using (SafeCryptMsgHandle hCryptMsg = EncodeHelpers.CreateCryptMsgHandleToEncode(recipients, contentInfo.ContentType, contentEncryptionAlgorithm, originatorCerts, unprotectedAttributes))
{
byte[] encodedContent;
if (contentInfo.ContentType.Value !.Equals(Oids.Pkcs7Data, StringComparison.OrdinalIgnoreCase))
{
encodedContent = PkcsHelpers.EncodeOctetString(contentInfo.Content);
}
private static byte[]? Decode(byte[]?rawData)
{
if (rawData == null)
{
return(null);
}
return(PkcsHelpers.DecodeOctetString(rawData));
}
//
// Private methods.
//
private static string Decode(byte[] rawData)
{
if (rawData == null)
{
return(null);
}
byte[] octets = PkcsHelpers.DecodeOctetString(rawData);
return(octets.OctetStringToUnicode());
}
private static byte[] Encode(string documentDescription)
{
if (documentDescription == null)
{
throw new ArgumentNullException(nameof(documentDescription));
}
byte[] octets = documentDescription.UnicodeToOctetString();
return(PkcsHelpers.EncodeOctetString(octets));
}
private static Oid?Decode(byte[]?rawData)
{
if (rawData == null)
{
return(null);
}
string contentTypeValue = PkcsHelpers.DecodeOid(rawData);
return(new Oid(contentTypeValue));
}
private Exception?TryDecryptAgree(KeyAgreeRecipientInfo keyAgreeRecipientInfo, SafeProvOrNCryptKeyHandle hKey, CryptKeySpec keySpec, X509Certificate2Collection originatorCerts, X509Certificate2Collection extraStore)
{
unsafe
{
KeyAgreeRecipientInfoPalWindows pal = (KeyAgreeRecipientInfoPalWindows)(keyAgreeRecipientInfo.Pal);
return(pal.WithCmsgCmsRecipientInfo <Exception?>(
delegate(CMSG_KEY_AGREE_RECIPIENT_INFO * pKeyAgreeRecipientInfo)
{
CMSG_CTRL_KEY_AGREE_DECRYPT_PARA decryptPara = default(CMSG_CTRL_KEY_AGREE_DECRYPT_PARA);
decryptPara.cbSize = Marshal.SizeOf <CMSG_CTRL_KEY_AGREE_DECRYPT_PARA>();
decryptPara.hProv = hKey;
decryptPara.dwKeySpec = keySpec;
decryptPara.pKeyAgree = pKeyAgreeRecipientInfo;
decryptPara.dwRecipientIndex = pal.Index;
decryptPara.dwRecipientEncryptedKeyIndex = pal.SubIndex;
CMsgKeyAgreeOriginatorChoice originatorChoice = pKeyAgreeRecipientInfo->dwOriginatorChoice;
switch (originatorChoice)
{
case CMsgKeyAgreeOriginatorChoice.CMSG_KEY_AGREE_ORIGINATOR_CERT:
{
X509Certificate2Collection candidateCerts = new X509Certificate2Collection();
candidateCerts.AddRange(PkcsHelpers.GetStoreCertificates(StoreName.AddressBook, StoreLocation.CurrentUser, openExistingOnly: true));
candidateCerts.AddRange(PkcsHelpers.GetStoreCertificates(StoreName.AddressBook, StoreLocation.LocalMachine, openExistingOnly: true));
candidateCerts.AddRange(originatorCerts);
candidateCerts.AddRange(extraStore);
SubjectIdentifier originatorId = pKeyAgreeRecipientInfo->OriginatorCertId.ToSubjectIdentifier();
X509Certificate2?originatorCert = candidateCerts.TryFindMatchingCertificate(originatorId);
if (originatorCert == null)
{
return ErrorCode.CRYPT_E_NOT_FOUND.ToCryptographicException();
}
using (SafeCertContextHandle hCertContext = originatorCert.CreateCertContextHandle())
{
CERT_CONTEXT *pOriginatorCertContext = hCertContext.DangerousGetCertContext();
decryptPara.OriginatorPublicKey = pOriginatorCertContext->pCertInfo->SubjectPublicKeyInfo.PublicKey;
// Do not factor this call out of the switch statement as leaving this "using" block will free up
// native memory that decryptPara points to.
return TryExecuteDecryptAgree(ref decryptPara);
}
}
case CMsgKeyAgreeOriginatorChoice.CMSG_KEY_AGREE_ORIGINATOR_PUBLIC_KEY:
{
decryptPara.OriginatorPublicKey = pKeyAgreeRecipientInfo->OriginatorPublicKeyInfo.PublicKey;
return TryExecuteDecryptAgree(ref decryptPara);
}
default:
return new CryptographicException(SR.Format(SR.Cryptography_Cms_Invalid_Originator_Identifier_Choice, originatorChoice));
}
}));
}
}
internal Pkcs12CertBag(X509Certificate2 cert)
: base(
Oids.Pkcs12CertBag,
EncodeBagValue(
Oids.Pkcs12X509CertBagType,
PkcsHelpers.EncodeOctetString(cert.RawData)),
skipCopy: true)
{
_decoded = CertBagAsn.Decode(EncodedBagValue, AsnEncodingRules.BER);
IsX509Certificate = true;
}
public byte[] Encode()
{
if (!_hasData)
{
throw new InvalidOperationException(SR.Cryptography_Cms_MessageNotSigned);
}
using (AsnWriter writer = new AsnWriter(AsnEncodingRules.DER))
{
_signedData.Encode(writer);
return(PkcsHelpers.EncodeContentInfo(writer.Encode(), Oids.Pkcs7Signed));
}
}
protected Pkcs12SafeBag(string bagIdValue, ReadOnlyMemory <byte> encodedBagValue, bool skipCopy = false)
{
if (string.IsNullOrEmpty(bagIdValue))
{
throw new ArgumentNullException(nameof(bagIdValue));
}
// Read to ensure that there is precisely one legally encoded value.
PkcsHelpers.EnsureSingleBerValue(encodedBagValue.Span);
_bagIdValue = bagIdValue;
EncodedBagValue = skipCopy ? encodedBagValue : encodedBagValue.ToArray();
}
public override void AddCertsFromStoreForDecryption(X509Certificate2Collection certs)
{
certs.AddRange(PkcsHelpers.GetStoreCertificates(StoreName.My, StoreLocation.CurrentUser, openExistingOnly: false));
try
{
// This store exists on macOS, but not Linux
certs.AddRange(
PkcsHelpers.GetStoreCertificates(StoreName.My, StoreLocation.LocalMachine, openExistingOnly: false));
}
catch (CryptographicException)
{
}
}
private static unsafe void AddCryptAttribute(CryptographicAttributeObjectCollection collection, CRYPT_ATTRIBUTE *pCryptAttribute)
{
string oidValue = pCryptAttribute->pszObjId.ToStringAnsi();
Oid oid = new Oid(oidValue);
AsnEncodedDataCollection attributeCollection = new AsnEncodedDataCollection();
for (int i = 0; i < pCryptAttribute->cValue; i++)
{
byte[] encodedAttribute = pCryptAttribute->rgValue[i].ToByteArray();
AsnEncodedData attributeObject = PkcsHelpers.CreateBestPkcs9AttributeObjectAvailable(oid, encodedAttribute);
attributeCollection.Add(attributeObject);
}
collection.Add(new CryptographicAttributeObject(oid, attributeCollection));
}
public Pkcs12SecretBag AddSecret(Oid secretType, ReadOnlyMemory <byte> secretValue)
{
if (secretType is null)
{
throw new ArgumentNullException(nameof(secretType));
}
// Read to ensure that there is precisely one legally encoded value.
PkcsHelpers.EnsureSingleBerValue(secretValue.Span);
Pkcs12SecretBag bag = new Pkcs12SecretBag(secretType, secretValue);
AddSafeBag(bag);
return(bag);
}
public sealed unsafe override byte[] Encrypt(CmsRecipientCollection recipients, ContentInfo contentInfo, AlgorithmIdentifier contentEncryptionAlgorithm, X509Certificate2Collection originatorCerts, CryptographicAttributeObjectCollection unprotectedAttributes)
{
using (SafeCryptMsgHandle hCryptMsg = EncodeHelpers.CreateCryptMsgHandleToEncode(recipients, contentInfo.ContentType, contentEncryptionAlgorithm, originatorCerts, unprotectedAttributes))
{
byte[] encodedContent;
if (contentInfo.ContentType.Value.Equals(Oids.Pkcs7Data, StringComparison.OrdinalIgnoreCase))
{
encodedContent = PkcsHelpers.EncodeOctetString(contentInfo.Content);
}
else
{
encodedContent = contentInfo.Content;
if (encodedContent.Length > 0)
{
// Windows will throw if it encounters indefinite length encoding.
// Let's reencode if that is the case
ReencodeIfUsingIndefiniteLengthEncodingOnOuterStructure(ref encodedContent);
}
}
if (encodedContent.Length > 0)
{
// Pin to avoid copy during heap compaction
fixed(byte *pinnedContent = encodedContent)
{
try
{
if (!Interop.Crypt32.CryptMsgUpdate(hCryptMsg, encodedContent, encodedContent.Length, fFinal: true))
{
throw Marshal.GetLastWin32Error().ToCryptographicException();
}
}
finally
{
if (!object.ReferenceEquals(encodedContent, contentInfo.Content))
{
Array.Clear(encodedContent, 0, encodedContent.Length);
}
}
}
}
byte[] encodedMessage = hCryptMsg.GetMsgParamAsByteArray(CryptMsgParamType.CMSG_CONTENT_PARAM);
return(encodedMessage);
}
}
private static unsafe void AddCryptAttribute(CryptographicAttributeObjectCollection collection, CRYPT_ATTRIBUTE *pCryptAttribute)
{
string oidValue = pCryptAttribute->pszObjId.ToStringAnsi();
Oid oid = new Oid(oidValue);
AsnEncodedDataCollection attributeCollection = new AsnEncodedDataCollection();
for (int i = 0; i < pCryptAttribute->cValue; i++)
{
// CreateBestPkcs9AttributeObjectAvailable is expected to create a copy of the data so that it has ownership
// of the underlying data.
ReadOnlySpan <byte> encodedAttribute = pCryptAttribute->rgValue[i].DangerousAsSpan();
AsnEncodedData attributeObject = PkcsHelpers.CreateBestPkcs9AttributeObjectAvailable(oid, encodedAttribute);
attributeCollection.Add(attributeObject);
}
collection.Add(new CryptographicAttributeObject(oid, attributeCollection));
}
private byte[] EncryptContent(
ContentInfo contentInfo,
AlgorithmIdentifier contentEncryptionAlgorithm,
out byte[] cek,
out byte[] parameterBytes)
{
using (SymmetricAlgorithm alg = OpenAlgorithm(contentEncryptionAlgorithm))
using (ICryptoTransform encryptor = alg.CreateEncryptor())
{
cek = alg.Key;
if (alg is RC2)
{
Rc2CbcParameters rc2Params = new Rc2CbcParameters(alg.IV, alg.KeySize);
using (AsnWriter writer = new AsnWriter(AsnEncodingRules.DER))
{
rc2Params.Encode(writer);
parameterBytes = writer.Encode();
}
}
else
{
parameterBytes = PkcsHelpers.EncodeOctetString(alg.IV);
}
byte[] toEncrypt = contentInfo.Content;
if (contentInfo.ContentType.Value == Oids.Pkcs7Data)
{
return encryptor.OneShot(toEncrypt);
}
else
{
if (contentInfo.Content.Length == 0)
{
return encryptor.OneShot(contentInfo.Content);
}
else
{
AsnReader reader = new AsnReader(contentInfo.Content, AsnEncodingRules.BER);
return encryptor.OneShot(reader.PeekContentBytes().ToArray());
}
}
}
}
public byte[] Encode()
{
if (!_hasData)
{
throw new InvalidOperationException(SR.Cryptography_Cms_MessageNotSigned);
}
try
{
using (AsnWriter writer = new AsnWriter(AsnEncodingRules.DER))
{
_signedData.Encode(writer);
return(PkcsHelpers.EncodeContentInfo(writer.Encode(), Oids.Pkcs7Signed));
}
}
catch (CryptographicException) when(!Detached)
{
// If we can't write the contents back out then the most likely culprit is an
// indefinite length encoding in the content field. To preserve as much input data
// as possible while still maintaining our expectations of sorting any SET OF values,
// do the following:
// * Write the DER normalized version of the SignedData in detached mode.
// * BER-decode that structure
// * Copy the content field over
// * BER-write the modified structure.
SignedDataAsn copy = _signedData;
copy.EncapContentInfo.Content = null;
Debug.Assert(_signedData.EncapContentInfo.Content != null);
using (AsnWriter detachedWriter = new AsnWriter(AsnEncodingRules.DER))
{
copy.Encode(detachedWriter);
copy = SignedDataAsn.Decode(detachedWriter.Encode(), AsnEncodingRules.BER);
}
copy.EncapContentInfo.Content = _signedData.EncapContentInfo.Content;
using (AsnWriter attachedWriter = new AsnWriter(AsnEncodingRules.BER))
{
copy.Encode(attachedWriter);
return(PkcsHelpers.EncodeContentInfo(attachedWriter.Encode(), Oids.Pkcs7Signed));
}
}
}
public static Rfc3161TimestampRequest CreateFromHash(
ReadOnlyMemory <byte> hash,
HashAlgorithmName hashAlgorithm,
Oid requestedPolicyId = null,
ReadOnlyMemory <byte>?nonce = null,
bool requestSignerCertificates = false,
X509ExtensionCollection extensions = null)
{
string oidStr = PkcsHelpers.GetOidFromHashAlgorithm(hashAlgorithm);
return(CreateFromHash(
hash,
new Oid(oidStr, oidStr),
requestedPolicyId,
nonce,
requestSignerCertificates,
extensions));
}
internal static byte[]? DecryptCekCore(
X509Certificate2?cert,
RSA?privateKey,
ReadOnlySpan <byte> encryptedKey,
string?keyEncryptionAlgorithm,
ReadOnlyMemory <byte>?algorithmParameters,
out Exception?exception)
{
RSAEncryptionPadding?encryptionPadding;
switch (keyEncryptionAlgorithm)
{
case Oids.Rsa:
encryptionPadding = RSAEncryptionPadding.Pkcs1;
break;
case Oids.RsaOaep:
if (!PkcsHelpers.TryGetRsaOaepEncryptionPadding(algorithmParameters, out encryptionPadding, out exception))
{
return(null);
}
break;
default:
exception = new CryptographicException(
SR.Cryptography_Cms_UnknownAlgorithm,
keyEncryptionAlgorithm);
return(null);
}
if (privateKey != null)
{
return(DecryptKey(privateKey, encryptionPadding, encryptedKey, out exception));
}
else
{
Debug.Assert(cert != null);
using (RSA? rsa = cert.GetRSAPrivateKey())
{
return(DecryptKey(rsa, encryptionPadding, encryptedKey, out exception));
}
}
}
public void RemoveSignature(int index)
{
if (!_hasData)
{
throw new InvalidOperationException(SR.Cryptography_Cms_MessageNotSigned);
}
if (index < 0 || index >= _signedData.SignerInfos.Length)
{
throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_Index);
}
AlgorithmIdentifierAsn signerAlgorithm = _signedData.SignerInfos[index].DigestAlgorithm;
PkcsHelpers.RemoveAt(ref _signedData.SignerInfos, index);
ConsiderDigestRemoval(signerAlgorithm);
UpdateMetadata();
}
public Pkcs8PrivateKeyInfo(
Oid algorithmId,
ReadOnlyMemory <byte>?algorithmParameters,
ReadOnlyMemory <byte> privateKey,
bool skipCopies = false)
{
if (algorithmId == null)
{
throw new ArgumentNullException(nameof(algorithmId));
}
if (algorithmParameters?.Length > 0)
{
// Read to ensure that there is precisely one legally encoded value.
PkcsHelpers.EnsureSingleBerValue(algorithmParameters.Value.Span);
}
AlgorithmId = algorithmId;
AlgorithmParameters = skipCopies ? algorithmParameters : algorithmParameters?.ToArray();
PrivateKeyBytes = skipCopies ? privateKey : privateKey.ToArray();
Attributes = new CryptographicAttributeObjectCollection();
}
public bool VerifySignatureForHash(
ReadOnlySpan <byte> hash,
HashAlgorithmName hashAlgorithm,
[NotNullWhen(true)] out X509Certificate2?signerCertificate,
X509Certificate2Collection?extraCandidates = null)
{
signerCertificate = null;
X509Certificate2?cert = GetSignerCertificate(extraCandidates);
if (cert == null)
{
return(false);
}
if (VerifyHash(hash, PkcsHelpers.GetOidFromHashAlgorithm(hashAlgorithm)))
{
signerCertificate = cert;
return(true);
}
return(false);
}
public bool VerifySignatureForHash(
ReadOnlySpan <byte> hash,
HashAlgorithmName hashAlgorithm,
out X509Certificate2 signerCertificate,
X509Certificate2Collection extraCandidates = null)
{
signerCertificate = null;
X509Certificate2 cert = GetSignerCertificate(extraCandidates);
if (cert == null)
{
return(false);
}
bool ret = VerifyHash(hash, PkcsHelpers.GetOidFromHashAlgorithm(hashAlgorithm));
if (ret)
{
signerCertificate = cert;
}
return(ret);
}
public void SealWithMac(
ReadOnlySpan <char> password,
HashAlgorithmName hashAlgorithm,
int iterationCount)
{
if (iterationCount < 1)
{
throw new ArgumentOutOfRangeException(nameof(iterationCount));
}
if (IsSealed)
{
throw new InvalidOperationException(SR.Cryptography_Pkcs12_PfxIsSealed);
}
byte[]? rentedAuthSafe = null;
Span <byte> authSafeSpan = default;
byte[]? rentedMac = null;
Span <byte> macSpan = default;
Span <byte> salt = stackalloc byte[0];
try
{
AsnWriter contentsWriter = new AsnWriter(AsnEncodingRules.BER);
using (IncrementalHash hasher = IncrementalHash.CreateHash(hashAlgorithm))
{
contentsWriter.PushSequence();
if (_contents != null)
{
foreach (ContentInfoAsn contentInfo in _contents)
{
contentInfo.Encode(contentsWriter);
}
}
contentsWriter.PopSequence();
rentedAuthSafe = CryptoPool.Rent(contentsWriter.GetEncodedLength());
if (!contentsWriter.TryEncode(rentedAuthSafe, out int written))
{
Debug.Fail("TryEncode failed with a pre-allocated buffer");
throw new InvalidOperationException();
}
authSafeSpan = rentedAuthSafe.AsSpan(0, written);
// Get an array of the proper size for the hash.
byte[] macKey = hasher.GetHashAndReset();
rentedMac = CryptoPool.Rent(macKey.Length);
macSpan = rentedMac.AsSpan(0, macKey.Length);
// Since the biggest supported hash is SHA-2-512 (64 bytes), the
// 128-byte cap here shouldn't ever come into play.
Debug.Assert(macKey.Length <= 128);
salt = stackalloc byte[Math.Min(macKey.Length, 128)];
RandomNumberGenerator.Fill(salt);
Pkcs12Kdf.DeriveMacKey(
password,
hashAlgorithm,
iterationCount,
salt,
macKey);
using (IncrementalHash mac = IncrementalHash.CreateHMAC(hashAlgorithm, macKey))
{
mac.AppendData(authSafeSpan);
if (!mac.TryGetHashAndReset(macSpan, out int bytesWritten) || bytesWritten != macSpan.Length)
{
Debug.Fail($"TryGetHashAndReset wrote {bytesWritten} of {macSpan.Length} bytes");
throw new CryptographicException();
}
}
}
// https://tools.ietf.org/html/rfc7292#section-4
//
// PFX ::= SEQUENCE {
// version INTEGER {v3(3)}(v3,...),
// authSafe ContentInfo,
// macData MacData OPTIONAL
// }
AsnWriter writer = new AsnWriter(AsnEncodingRules.BER);
{
writer.PushSequence();
writer.WriteInteger(3);
writer.PushSequence();
{
writer.WriteObjectIdentifierForCrypto(Oids.Pkcs7Data);
Asn1Tag contextSpecific0 = new Asn1Tag(TagClass.ContextSpecific, 0);
writer.PushSequence(contextSpecific0);
{
writer.WriteOctetString(authSafeSpan);
writer.PopSequence(contextSpecific0);
}
writer.PopSequence();
}
// https://tools.ietf.org/html/rfc7292#section-4
//
// MacData ::= SEQUENCE {
// mac DigestInfo,
// macSalt OCTET STRING,
// iterations INTEGER DEFAULT 1
// -- Note: The default is for historical reasons and its use is
// -- deprecated.
// }
writer.PushSequence();
{
writer.PushSequence();
{
writer.PushSequence();
{
writer.WriteObjectIdentifierForCrypto(PkcsHelpers.GetOidFromHashAlgorithm(hashAlgorithm));
writer.PopSequence();
}
writer.WriteOctetString(macSpan);
writer.PopSequence();
}
writer.WriteOctetString(salt);
if (iterationCount > 1)
{
writer.WriteInteger(iterationCount);
}
writer.PopSequence();
}
writer.PopSequence();
_sealedData = writer.Encode();
}
}
finally
{
CryptographicOperations.ZeroMemory(macSpan);
CryptographicOperations.ZeroMemory(authSafeSpan);
if (rentedMac != null)
{
// Already cleared
CryptoPool.Return(rentedMac, clearSize: 0);
}
if (rentedAuthSafe != null)
{
// Already cleared
CryptoPool.Return(rentedAuthSafe, clearSize: 0);
}
}
}