The date which this certificate becomes valid. Prior to this it is not valid. The following is an example of an encoded date illustrating the format:

23-Jan-2000 15:00:00.

The certificate (PEM/base64 encoded). This field is used to assign a specific certificate. The Store and Subject fields may also be used to specify a certificate.

When Encoded is set, a search is initiated in the current Store for the private key of the certificate. If the key is found, Subject is updated to reflect the full subject of the selected certificate, otherwise Subject is set to empty string.

The certificate (PEM/base64 encoded). This field is used to assign a specific certificate. The Store and Subject fields may also be used to specify a certificate.

When Encoded is set, a search is initiated in the current Store for the private key of the certificate. If the key is found, Subject is updated to reflect the full subject of the selected certificate, otherwise Subject is set to empty string.

The date the certificate expires. Dates following this date, the certificate will no longer be valid. The following is an example of an encoded date illustrating the format:

23-Jan-2001 15:00:00.

A comma-delimited list of extended key usage identifiers. These are the same as ASN.1 Object-Identifiers (OIDs).

The hex-encoded, 16-byte MD5 fingerprint of the certificate.

This is in the form:

bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02

The issuer of the certificate. This field contains a string representation of the name of the issuing authority for the certificate.

The private key of the certificate (if available). The key is provided as PEM/Base64-encoded data.

Note: The PrivateKey may be available, but not exportable. In this case, PrivateKey returns an empty string.

Shows whether a PrivateKey is available for the selected certificate. If PrivateKeyAvailable is True, the certificate may be used for authentication purposes (e.g. server authentication).

The name of the PrivateKey container for the certificate (if available). This functionality is available only on Windows platforms.

The public key of the certificate. The key is provided as PEM/Base64-encoded data.

Textual description of the public key algorithm of the certificate. The property contains either the name of the algorithm (such as "RSA" or "RSA_DH"), or an object identifier (OID) string representing the algorithm.

The length of the certificate public key (in bits). Common values are 512, 1024, and 2048.

The serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, each two of them representing a byte of the serial number.

Text description of the signature algorithm of the certificate. The property contains either the name of the algorithm (such as "RSA" or "RSA_MD5RSA"), or an object identifier (OID) string representing the algorithm.

The name of the certificate store for the client certificate.

The StoreType field specifies the type of the certificate store specified by Store. If the store is password protected, specify the password in StorePassword.

Store is used in conjunction with the Subject field in order to specify client certificates. If Store has a value, and Subject or Encoded is set, a search for a certificate is initiated. Please refer to the Subject field for details.

Designations of certificate stores are platform-dependent.

The following are designations of the most common User and Machine certificate stores in Windows:

When the certificate store type is PFXFile, this property must be set to the name of the file. When the type is PFXBlob, the property must be set to the binary contents of a PFX file (i.e. PKCS12 certificate store).

The name of the certificate store for the client certificate.

The StoreType field specifies the type of the certificate store specified by Store. If the store is password protected, specify the password in StorePassword.

Store is used in conjunction with the Subject field in order to specify client certificates. If Store has a value, and Subject or Encoded is set, a search for a certificate is initiated. Please refer to the Subject field for details.

Designations of certificate stores are platform-dependent.

The following are designations of the most common User and Machine certificate stores in Windows:

When the certificate store type is PFXFile, this property must be set to the name of the file. When the type is PFXBlob, the property must be set to the binary contents of a PFX file (i.e. PKCS12 certificate store).

If the certificate store is of a type that requires a password, this property is used to specify that password in order to open the certificate store.

The type of certificate store for this certificate.

The component supports both public and private keys in a variety of formats. When the cstAuto value is used the component will automatically determine the type. This field can take one of the following values:

certmgr.CertStoreType = CertStoreTypes.cstSecurityKey;
certmgr.OnCertList += (s, e) => {
  secKeyBlob = e.CertEncoded;
};
certmgr.CertStore = @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll";
certmgr.CertStorePassword = "123456"; //PIN
certmgr.ListStoreCertificates();

sftp.SSHCert = new Certificate(CertStoreTypes.cstSecurityKey, secKeyBlob, "123456", "*");
sftp.SSHUser = "test";
sftp.SSHLogon("myhost", 22);

The subject of the certificate used for client authentication.

This field will be populated with the full subject of the loaded certificate. When loading a certificate the subject is used to locate the certificate in the store.

If an exact match is not found, the store is searched for subjects containing the value of the property.

If a match is still not found, the property is set to an empty string, and no certificate is selected.

The special value "*" picks a random certificate in the certificate store.

The certificate subject is a comma separated list of distinguished name fields and values. For instance "CN=www.server.com, OU=test, C=US, E=support@nsoftware.com". Common fields and their meanings are displayed below.

If a field value contains a comma it must be quoted.

A comma-separated lists of alternative subject names of the certificate.

MD5 hash of the certificate. If the hash does not already exist, it is computed.

SHA1 hash of the certificate. If the hash does not already exist, it is computed.

SHA256 hash of the certificate. If the hash does not already exist, it is computed.

Text description of UsageFlags.

The value will be of one or more of the following strings, separated by commas:

• Digital Signatures
• Key Authentication
• Key Encryption
• Data Encryption
• Key Agreement
• Certificate Signing
• Key Signing

If the provider is OpenSSL, the value is a comma separated list of X509 certificate extension names.

Flags that show intended use for the certificate. The value of UsageFlags is a combination of the following flags:

Please refer to the Usage field for a text representation of UsageFlags.

This functionality is currently not available when the provider is OpenSSL.

The certificate's version number. The possible values are the strings "V1", "V2", and "V3".