PPOP Component

Properties Methods Events Configuration Settings Errors

The PPOP component is used retrieve and process OpenPGP encrypted and/or signed messages from Internet Post Office servers (POP).

Syntax

nsoftware.IPWorksOpenPGP.Ppop

Remarks

The PPOP component implements a standard internet post office (POP3) client, as specified in RFC 1725, and supports decrypting and verifying signatures of encrypted and signed emails using OpenPGP. You can send an OpenPGP signed and encrypted message using the PSMTP component by calling the Encrypt, Sign, and SignAndEncrypt methods.

Connect to the Server

To connect to a MailServer, first set the appropriate User and Password and then connect by calling the Connect method. Upon successful connection to the MailServer, the number of waiting messages is shown by the MessageCount property. A message is selected by setting the MessageNumber property to a number between 1 and MessageCount (inclusive). Then, the message text and/or headers are received by calling the Retrieve method.

Receive Messages

The message text is received through the Transfer event, whereas the message headers are received through the Header event. Additionally, up to MaxLines from the message body are provided in the MessageText property. The StartTransfer and EndTransfer events are fired at the beginning and end of message transmission. The PITrail event provides a trace of the interaction between the client and server (excluding message transfers).

Verify

To verify the signature of a message specify the public key to be used for signature verification by adding a key to SignerKeys. For instance:

ppop.Keys.Add(new Key("c:\\my_keyring_dir", "sender@nsoftware.com"));

The specified public key will be used to verify the signature when calling VerifySignature.

Decrypt

To process an encrypted or signed message first retrieve the message text and headers by calling Retrieve. To decrypt a message specify the private key to be used for decryption by adding a key to Key. For instance:

ppop.Keys.Add(new Key("c:\\my_keyring_dir", "recipient@nsoftware.com"));
ppop.Keys[0].Passphrase = "password";

The specified private key will be used to decrypt the message when calling Decrypt.

Decrypt and Verify

To decrypt and verify in one step, you can call DecryptAndVerifySignature. Set the public key of the sender in the Key property and the private key to be used for decryption in .

Property List

The following is the full list of the properties of the component with short descriptions. Click on the links for further details.


AuthMechanism	The authentication mechanism to be used when connecting to the mail server.
Command	Used to send additional commands directly to the server.
Connected	Shows whether the component is connected.
Firewall	A set of properties related to firewall access.
Idle	The current status of the component.
IncludeHeaders	Instructs the component to include the headers in the MessageText and LocalFile.
Keys	A collection of keys used for cryptographic operations.
LastReply	The last reply from the server.
LocalHost	The name of the local host or user-assigned IP interface through which connections are initiated or accepted.
MailPort	The server port for POP (default 110).
MailServer	The name or address of a mail server (internet post office server).
MaxLines	The maximum number of message lines besides headers to retrieve.
Message	Provides the raw message content.
MessageCc	The value of the CC header of the last retrieved message.
MessageCount	The number of messages in the mailbox.
MessageDate	The value of the date header of the last retrieved message.
MessageFrom	The value of the from header of the last retrieved message.
MessageHeaders	Collection of the message headers as retrieved from the server.
MessageHeadersString	A string representation of the full headers of the message as retrieved from the server.
MessageNumber	Current (selected) message.
MessageRecipients	A collection of recipients for the current message.
MessageReplyTo	The value of the Reply-To header of the last retrieved message.
MessageSize	The size in bytes of the current message.
MessageSubject	The value of the Subject header of the last retrieved message.
MessageText	The full text of the message as retrieved from the server.
MessageTo	The value of the To header of the last retrieved message.
MessageUID	The unique identifier of the message as specified by the server.
Password	The password for the mailbox user.
SignerKeys	The collection of keys belonging to the signer of the message.
SSLAcceptServerCert	Instructs the component to unconditionally accept the server certificate that matches the supplied certificate.
SSLCert	The certificate to be used during SSL negotiation.
SSLServerCert	The server certificate for the last established connection.
SSLStartMode	Determines how the component starts the SSL negotiation.
Timeout	A timeout for the component.
TotalSize	Cumulative size in bytes of messages in the mailbox (including headers).
User	The user identifier for the mailbox.

Method List

The following is the full list of the methods of the component with short descriptions. Click on the links for further details.


Config	Sets or retrieves a configuration setting .
Connect	Connects to the mail server and attempts to login.
Decrypt	Decrypts the message.
DecryptAndVerifySignature	Decrypts and verifies the signature of the message.
Delete	Deletes a message specified by MessageNumber on the server.
Disconnect	Disconnects from the mail server.
DoEvents	Processes events from the internal message queue.
Interrupt	Interrupt the current method.
ListMessageSizes	Retrieves a list of all message sizes from the server.
ListMessageUIDs	Retrieves a list of all message UIDs from the server.
LocalizeDate	Converts a valid RFC 822 message date to local date and time.
Reset	Resets all changes and revert back to the state when the user first connected.
Retrieve	Retrieves a message specified by MessageNumber from the server.
RetrieveHeaders	Retrieves headers for a message specified by MessageNumber .
SetMessageStream	Sets the stream to which the message downloaded from the server will be written.
VerifySignature	Verifies the signature of the current message.

Event List

The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.


ConnectionStatus	Fired to indicate changes in connection state.
EndTransfer	Fired when the message completes transferring.
Error	Information about errors during data delivery.
Header	Fired for every message header being retrieved.
KeyPassphrase	Fired if the passphrase of current key is incorrect or empty.
MessageList	Fired for every message listed by ListMessageSizes and/or ListMessageUIDs .
PITrail	Traces the commands sent to the mail server, and the respective replies.
Progress	Fired as progress is made.
RecipientInfo	Fired for each recipient key of the encrypted message.
SignatureInfo	Fired during verification of the signed message.
SSLServerAuthentication	Fired after the server presents its certificate to the client.
SSLStatus	Shows the progress of the secure connection.
StartTransfer	Fired when the message starts transferring.
Status	Shows the progress of the operation.
Transfer	Fired while the message gets transferred from MailServer .
VerificationStatus	Fired after verification of the signed message.

Configuration Settings

The following is a list of configuration settings for the component with short descriptions. Click on the links for further details.


Comment	The OpenPGP message comment.
ProcessAttachments	Whether or not to process attachments.
LogLevel	Specifies the level of detail that is logged.
RequireValidSignature	Specifies if an invalid signature is considered an error condition.
SymmetricPassphrase	The password used for symmetric encryption or decryption.
VersionHeader	The Version header value in the ASCII armored OpenPGP message.
AuthorizationIdentity	The value to use as the authorization identity when SASL authentication is used.
AutoDecodeSubject	Instructs the component to automatically decode message subjects.
GetMessageSize	Whether to poll the server for the message size prior to retrieving it.
MaxLineLength	The maximum expected length for message lines.
ConnectionTimeout	Sets a separate timeout value for establishing a connection.
FirewallAutoDetect	Tells the component whether or not to automatically detect and use firewall system settings, if available.
FirewallHost	Name or IP address of firewall (optional).
FirewallPassword	Password to be used if authentication is to be used when connecting through the firewall.
FirewallPort	The TCP port for the FirewallHost;.
FirewallType	Determines the type of firewall to connect through.
FirewallUser	A user name if authentication is to be used connecting through a firewall.
KeepAliveTime	The inactivity time in milliseconds before a TCP keep-alive packet is sent.
KeepAliveInterval	The retry interval, in milliseconds, to be used when a TCP keep-alive packet is sent and no response is received.
Linger	When set to True, connections are terminated gracefully.
LingerTime	Time in seconds to have the connection linger.
LocalHost	The name of the local host through which connections are initiated or accepted.
LocalPort	The TCP port in the local host where the component binds.
MaxLineLength	The maximum amount of data to accumulate when no EOL is found.
MaxTransferRate	The transfer rate limit in bytes per second.
RecordLength	The length of received data records.
TCPKeepAlive	Determines whether or not the keep alive socket option is enabled.
UseIPv6	Whether to use IPv6.
TcpNoDelay	Whether or not to delay when sending packets.
ReuseSSLSession	Determines if the SSL session is reused.
SSLCipherStrength	The minimum cipher strength used for bulk encryption.
SSLEnabledProtocols	Used to enable/disable the supported security protocols.
SSLProvider	The name of the security provider to use.
SSLSecurityFlags	Flags that control certificate verification.
OpenSSLCADir	The path to a directory containing CA certificates.
OpenSSLCAFile	Name of the file containing the list of CA's trusted by your application.
OpenSSLCipherList	A string that controls the ciphers to be used by SSL.
OpenSSLPrngSeedData	The data to seed the pseudo random number generator (PRNG).
AbsoluteTimeout	Determines whether timeouts are inactivity timeouts or absolute timeouts.
FirewallData	Used to send extra data to the firewall.
InBufferSize	The size in bytes of the incoming queue of the socket.
OutBufferSize	The size in bytes of the outgoing queue of the socket.
CodePage	The system code page used for Unicode to Multibyte translations.