MessageCompressor Class

Properties   Methods   Events   Config Settings   Errors  

The MessageCompressor class compresses data and stores it in the PKCS#7 format.

Syntax

MessageCompressor

Remarks

PKCS#7 (Public Key Cryptography Standard #7) is a common format used to store encrypted and signed data. It is used by a variety of protocols, including S/MIME and CMS. MessageCompressor compressor = new MessageCompressor(); compressor.setCompressionLevel(4); //compression level (1 to 9). Default value is 6. //path of the file where the decompressed message is located compressor.setInputFile("./decompressedMessage.txt"); //path of the file where the compressed message will be written compressor.setOutputFile("./compressedMessage.bin"); compressor.compress(); //compressing the file

Property List


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

CompressionLevelCompression level to apply (1-9).
FIPSModeReserved.
InputBytesUse this property to pass the input to class in byte array form.
InputFilePath to the source (uncompressed) file.
OutputBytesUse this property to read the output the class object has produced.
OutputFilePath to the destination (compressed) file.

Method List


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

CompressCompresses input data into a PKCS7 message.
ConfigSets or retrieves a configuration setting.
DoActionPerforms an additional action.
ResetResets the class settings.

Event List


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

ErrorInformation about errors during PKCS#7 message encryption.
NotificationThis event notifies the application about an underlying control flow event.

Config Settings


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

ContentTypeContent type.
FragmentSizeFragment size.
TempPathPath for storing temporary files.
UseUndefSizeAllows or forbids the use of ASN.1 tags of undefined size.
CheckKeyIntegrityBeforeUseEnables or disable private key integrity check before use.
CookieCachingSpecifies whether a cookie cache should be used for HTTP(S) transports.
CookiesGets or sets local cookies for the class.
DefDeriveKeyIterationsSpecifies the default key derivation algorithm iteration count.
EnableClientSideSSLFFDHEEnables or disables finite field DHE key exchange support in TLS clients.
GlobalCookiesGets or sets global cookies for all the HTTP transports.
HttpUserAgentSpecifies the user agent name to be used by all HTTP clients.
LogDestinationSpecifies the debug log destination.
LogDetailsSpecifies the debug log details to dump.
LogFileSpecifies the debug log filename.
LogFiltersSpecifies the debug log filters.
LogFlushModeSpecifies the log flush mode.
LogLevelSpecifies the debug log level.
LogMaxEventCountSpecifies the maximum number of events to cache before further action is taken.
LogRotationModeSpecifies the log rotation mode.
MaxASN1BufferLengthSpecifies the maximal allowed length for ASN.1 primitive tag data.
MaxASN1TreeDepthSpecifies the maximal depth for processed ASN.1 trees.
OCSPHashAlgorithmSpecifies the hash algorithm to be used to identify certificates in OCSP requests.
StaticDNSSpecifies whether static DNS rules should be used.
StaticIPAddress[domain]Gets or sets an IP address for the specified domain name.
StaticIPAddressesGets or sets all the static DNS rules.
TagAllows to store any custom data.
TLSSessionGroupSpecifies the group name of TLS sessions to be used for session resumption.
TLSSessionLifetimeSpecifies lifetime in seconds of the cached TLS session.
TLSSessionPurgeIntervalSpecifies how often the session cache should remove the expired TLS sessions.
UseOwnDNSResolverSpecifies whether the client classes should use own DNS resolver.
UseSharedSystemStoragesSpecifies whether the validation engine should use a global per-process copy of the system certificate stores.
UseSystemOAEPAndPSSEnforces or disables the use of system-driven RSA OAEP and PSS computations.
UseSystemRandomEnables or disables the use of the OS PRNG.

CompressionLevel Property (MessageCompressor Class)

Compression level to apply (1-9).

Syntax

ANSI (Cross Platform)
int GetCompressionLevel();
int SetCompressionLevel(int iCompressionLevel); Unicode (Windows) INT GetCompressionLevel();
INT SetCompressionLevel(INT iCompressionLevel);
int secureblackbox_messagecompressor_getcompressionlevel(void* lpObj);
int secureblackbox_messagecompressor_setcompressionlevel(void* lpObj, int iCompressionLevel);
int GetCompressionLevel();
int SetCompressionLevel(int iCompressionLevel);

Default Value

6

Remarks

Use this property to specify the compression level to use, from 1 (the lightest, but quickest) to 9 (the best, but the slowest).

Data Type

Integer

FIPSMode Property (MessageCompressor Class)

Reserved.

Syntax

ANSI (Cross Platform)
int GetFIPSMode();
int SetFIPSMode(int bFIPSMode); Unicode (Windows) BOOL GetFIPSMode();
INT SetFIPSMode(BOOL bFIPSMode);
int secureblackbox_messagecompressor_getfipsmode(void* lpObj);
int secureblackbox_messagecompressor_setfipsmode(void* lpObj, int bFIPSMode);
bool GetFIPSMode();
int SetFIPSMode(bool bFIPSMode);

Default Value

FALSE

Remarks

This property is reserved for future use.

Data Type

Boolean

InputBytes Property (MessageCompressor Class)

Use this property to pass the input to class in byte array form.

Syntax

ANSI (Cross Platform)
int GetInputBytes(char* &lpInputBytes, int &lenInputBytes);
int SetInputBytes(const char* lpInputBytes, int lenInputBytes); Unicode (Windows) INT GetInputBytes(LPSTR &lpInputBytes, INT &lenInputBytes);
INT SetInputBytes(LPCSTR lpInputBytes, INT lenInputBytes);
int secureblackbox_messagecompressor_getinputbytes(void* lpObj, char** lpInputBytes, int* lenInputBytes);
int secureblackbox_messagecompressor_setinputbytes(void* lpObj, const char* lpInputBytes, int lenInputBytes);
QByteArray GetInputBytes();
int SetInputBytes(QByteArray qbaInputBytes);

Remarks

Assign a byte array containing the data to be processed to this property.

This property is not available at design time.

Data Type

Byte Array

InputFile Property (MessageCompressor Class)

Path to the source (uncompressed) file.

Syntax

ANSI (Cross Platform)
char* GetInputFile();
int SetInputFile(const char* lpszInputFile); Unicode (Windows) LPWSTR GetInputFile();
INT SetInputFile(LPCWSTR lpszInputFile);
char* secureblackbox_messagecompressor_getinputfile(void* lpObj);
int secureblackbox_messagecompressor_setinputfile(void* lpObj, const char* lpszInputFile);
QString GetInputFile();
int SetInputFile(QString qsInputFile);

Default Value

""

Remarks

Use this property to provide the compression source.

Data Type

String

OutputBytes Property (MessageCompressor Class)

Use this property to read the output the class object has produced.

Syntax

ANSI (Cross Platform)
int GetOutputBytes(char* &lpOutputBytes, int &lenOutputBytes);

Unicode (Windows)
INT GetOutputBytes(LPSTR &lpOutputBytes, INT &lenOutputBytes);
int secureblackbox_messagecompressor_getoutputbytes(void* lpObj, char** lpOutputBytes, int* lenOutputBytes);
QByteArray GetOutputBytes();

Remarks

Read the contents of this property after the operation has completed to read the produced output. This property will only be set if the OutputFile and OutputStream properties had not been assigned.

This property is read-only and not available at design time.

Data Type

Byte Array

OutputFile Property (MessageCompressor Class)

Path to the destination (compressed) file.

Syntax

ANSI (Cross Platform)
char* GetOutputFile();
int SetOutputFile(const char* lpszOutputFile); Unicode (Windows) LPWSTR GetOutputFile();
INT SetOutputFile(LPCWSTR lpszOutputFile);
char* secureblackbox_messagecompressor_getoutputfile(void* lpObj);
int secureblackbox_messagecompressor_setoutputfile(void* lpObj, const char* lpszOutputFile);
QString GetOutputFile();
int SetOutputFile(QString qsOutputFile);

Default Value

""

Remarks

Use this property to specify the file where the compressed PKCS#7 message is to be saved.

Data Type

String

Compress Method (MessageCompressor Class)

Compresses input data into a PKCS7 message.

Syntax

ANSI (Cross Platform)
int Compress();

Unicode (Windows)
INT Compress();
int secureblackbox_messagecompressor_compress(void* lpObj);
int Compress();

Remarks

Call this method to compress the data residing provided via InputFile (or InputStream) and save the output in OutputFile (OutputStream).

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

Config Method (MessageCompressor Class)

Sets or retrieves a configuration setting.

Syntax

ANSI (Cross Platform)
char* Config(const char* lpszConfigurationString);

Unicode (Windows)
LPWSTR Config(LPCWSTR lpszConfigurationString);
char* secureblackbox_messagecompressor_config(void* lpObj, const char* lpszConfigurationString);
QString Config(const QString& qsConfigurationString);

Remarks

Config is a generic method available in every class. It is used to set and retrieve configuration settings for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

Error Handling (C++)

This method returns a String value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

DoAction Method (MessageCompressor Class)

Performs an additional action.

Syntax

ANSI (Cross Platform)
char* DoAction(const char* lpszActionID, const char* lpszActionParams);

Unicode (Windows)
LPWSTR DoAction(LPCWSTR lpszActionID, LPCWSTR lpszActionParams);
char* secureblackbox_messagecompressor_doaction(void* lpObj, const char* lpszActionID, const char* lpszActionParams);
QString DoAction(const QString& qsActionID, const QString& qsActionParams);

Remarks

DoAction is a generic method available in every class. It is used to perform an additional action introduced after the product major release. The list of actions is not fixed, and may be flexibly extended over time.

The unique identifier (case insensitive) of the action is provided in the ActionID parameter.

ActionParams contains the value of a single parameter, or a list of multiple parameters for the action in the form of PARAM1=VALUE1;PARAM2=VALUE2;....

Error Handling (C++)

This method returns a String value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

Reset Method (MessageCompressor Class)

Resets the class settings.

Syntax

ANSI (Cross Platform)
int Reset();

Unicode (Windows)
INT Reset();
int secureblackbox_messagecompressor_reset(void* lpObj);
int Reset();

Remarks

Reset is a generic method available in every class.

Error Handling (C++)

This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)

Error Event (MessageCompressor Class)

Information about errors during PKCS#7 message encryption.

Syntax

ANSI (Cross Platform)
virtual int FireError(MessageCompressorErrorEventParams *e);
typedef struct {
int ErrorCode;
const char *Description; int reserved; } MessageCompressorErrorEventParams;
Unicode (Windows) virtual INT FireError(MessageCompressorErrorEventParams *e);
typedef struct {
INT ErrorCode;
LPCWSTR Description; INT reserved; } MessageCompressorErrorEventParams;
#define EID_MESSAGECOMPRESSOR_ERROR 1

virtual INT SECUREBLACKBOX_CALL FireError(INT &iErrorCode, LPSTR &lpszDescription);
class MessageCompressorErrorEventParams {
public:
  int ErrorCode();

  const QString &Description();

  int EventRetVal();
  void SetEventRetVal(int iRetVal);
};
// To handle, connect one or more slots to this signal. void Error(MessageCompressorErrorEventParams *e);
// Or, subclass MessageCompressor and override this emitter function. virtual int FireError(MessageCompressorErrorEventParams *e) {...}

Remarks

The event is fired in case of exceptional conditions during message processing.

ErrorCode contains an error code and Description contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Messages section.

Notification Event (MessageCompressor Class)

This event notifies the application about an underlying control flow event.

Syntax

ANSI (Cross Platform)
virtual int FireNotification(MessageCompressorNotificationEventParams *e);
typedef struct {
const char *EventID;
const char *EventParam; int reserved; } MessageCompressorNotificationEventParams;
Unicode (Windows) virtual INT FireNotification(MessageCompressorNotificationEventParams *e);
typedef struct {
LPCWSTR EventID;
LPCWSTR EventParam; INT reserved; } MessageCompressorNotificationEventParams;
#define EID_MESSAGECOMPRESSOR_NOTIFICATION 2

virtual INT SECUREBLACKBOX_CALL FireNotification(LPSTR &lpszEventID, LPSTR &lpszEventParam);
class MessageCompressorNotificationEventParams {
public:
  const QString &EventID();

  const QString &EventParam();

  int EventRetVal();
  void SetEventRetVal(int iRetVal);
};
// To handle, connect one or more slots to this signal. void Notification(MessageCompressorNotificationEventParams *e);
// Or, subclass MessageCompressor and override this emitter function. virtual int FireNotification(MessageCompressorNotificationEventParams *e) {...}

Remarks

The class fires this event to let the application know about some event, occurrence, or milestone in the class. For example, it may fire to report completion of the document processing. The list of events being reported is not fixed, and may be flexibly extended over time.

The unique identifier of the event is provided in the EventID parameter. EventParam contains any parameters accompanying the occurrence. Depending on the type of the class, the exact action it is performing, or the document being processed, one or both may be omitted.

Config Settings (MessageCompressor Class)

The class accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the Config method.

MessageCompressor Config Settings

ContentType:   Content type.

The Content type.

FragmentSize:   Fragment size.

Fragment size.

TempPath:   Path for storing temporary files.

This setting specifies an absolute path to the location on disk where temporary files are stored.

UseUndefSize:   Allows or forbids the use of ASN.1 tags of undefined size.

Usually PKCS#7 messages are handled correctly when undefined-size tags are used. However some ASN.1 parsers (S/MIME handler in Outlook Express, security plugins of Adobe Acrobat) can't correctly handle such tags. If you are targeting such software, you need this property.

Base Config Settings

CheckKeyIntegrityBeforeUse:   Enables or disable private key integrity check before use.

This global property enables or disables private key material check before each signing operation. This slows down performance a bit, but prevents a selection of attacks on RSA keys where keys with unknown origins are used.

You can switch this property off to improve performance if your project only uses known, good private keys.

CookieCaching:   Specifies whether a cookie cache should be used for HTTP(S) transports.

Set this property to enable or disable cookies caching for the class.

Supported values are:

offNo caching (default)
localLocal caching
globalGlobal caching

Cookies:   Gets or sets local cookies for the class.

Use this property to get cookies from the internal cookie storage of the class and/or restore them back between application sessions.

DefDeriveKeyIterations:   Specifies the default key derivation algorithm iteration count.

This global property sets the default number of iterations for all supported key derivation algorithms. Note that you can provide the required number of iterations by using properties of the relevant key generation component; this global setting is used in scenarios where specific iteration count is not or cannot be provided.

EnableClientSideSSLFFDHE:   Enables or disables finite field DHE key exchange support in TLS clients.

This global property enables or disables support for finite field DHE key exchange methods in TLS clients. FF DHE is a slower algorithm if compared to EC DHE; enabling it may result in slower connections.

This setting only applies to sessions negotiated with TLS version 1.3.

GlobalCookies:   Gets or sets global cookies for all the HTTP transports.

Use this property to get cookies from the GLOBAL cookie storage or restore them back between application sessions. These cookies will be used by all the classes that have its CookieCaching property set to "global".

HttpUserAgent:   Specifies the user agent name to be used by all HTTP clients.

This global setting defines the User-Agent field of the HTTP request provides information about the software that initiates the request. This value will be used by all the HTTP clients including the ones used internally in other classes.

LogDestination:   Specifies the debug log destination.

Contains a comma-separated list of values that specifies where debug log should be dumped.

Supported values are:

fileFile
consoleConsole
systemlogSystem Log (supported for Android only)
debuggerDebugger (supported for VCL for Windows and .Net)

LogDetails:   Specifies the debug log details to dump.

Contains a comma-separated list of values that specifies which debug log details to dump.

Supported values are:

timeCurrent time
levelLevel
packagePackage name
moduleModule name
classClass name
methodMethod name
threadidThread Id
contenttypeContent type
contentContent
allAll details

LogFile:   Specifies the debug log filename.

Use this property to provide a path to the log file.

LogFilters:   Specifies the debug log filters.

Contains a comma-separated list of value pairs ("name:value") that describe filters.

Supported filter names are:

exclude-packageExclude a package specified in the value
exclude-moduleExclude a module specified in the value
exclude-classExclude a class specified in the value
exclude-methodExclude a method specified in the value
include-packageInclude a package specified in the value
include-moduleInclude a module specified in the value
include-classInclude a class specified in the value
include-methodInclude a method specified in the value

LogFlushMode:   Specifies the log flush mode.

Use this property to set the log flush mode. The following values are defined:

noneNo flush (caching only)
immediateImmediate flush (real-time logging)
maxcountFlush cached entries upon reaching LogMaxEventCount entries in the cache.

LogLevel:   Specifies the debug log level.

Use this property to provide the desired debug log level.

Supported values are:

noneNone (by default)
fatalSevere errors that cause premature termination.
errorOther runtime errors or unexpected conditions.
warningUse of deprecated APIs, poor use of API, 'almost' errors, other runtime situations that are undesirable or unexpected, but not necessarily "wrong".
infoInteresting runtime events (startup/shutdown).
debugDetailed information on flow of through the system.
traceMore detailed information.

LogMaxEventCount:   Specifies the maximum number of events to cache before further action is taken.

Use this property to specify the log event number threshold. This threshold may have different effects, depending on the rotation setting and/or the flush mode.

The default value of this setting is 100.

LogRotationMode:   Specifies the log rotation mode.

Use this property to set the log rotation mode. The following values are defined:

noneNo rotation
deleteolderDelete older entries from the cache upon reaching LogMaxEventCount
keepolderKeep older entries in the cache upon reaching LogMaxEventCount (newer entries are discarded)

MaxASN1BufferLength:   Specifies the maximal allowed length for ASN.1 primitive tag data.

This global property limits the maximal allowed length for ASN.1 tag data for non-content-carrying structures, such as certificates, CRLs, or timestamps. It does not affect structures that can carry content, such as CMS/CAdES messages. This is a security property aiming at preventing DoS attacks.

MaxASN1TreeDepth:   Specifies the maximal depth for processed ASN.1 trees.

This global property limits the maximal depth of ASN.1 trees that the component can handle without throwing an error. This is a security property aiming at preventing DoS attacks.

OCSPHashAlgorithm:   Specifies the hash algorithm to be used to identify certificates in OCSP requests.

This global setting defines the hash algorithm to use in OCSP requests during chain validation. Some OCSP responders can only use older algorithms, in which case setting this property to SHA1 may be helpful.

StaticDNS:   Specifies whether static DNS rules should be used.

Set this property to enable or disable static DNS rules for the class. Works only if UseOwnDNSResolver is set to true.

Supported values are:

noneNo static DNS rules (default)
localLocal static DNS rules
globalGlobal static DNS rules

StaticIPAddress[domain]:   Gets or sets an IP address for the specified domain name.

Use this property to get or set an IP address for the specified domain name in the internal (of the class) or global DNS rules storage depending on the StaticDNS value. The type of the IP address (IPv4 or IPv6) is determined automatically. If both addresses are available, they are devided by the | (pipe) character.

StaticIPAddresses:   Gets or sets all the static DNS rules.

Use this property to get static DNS rules from the current rules storage or restore them back between application sessions. If StaticDNS of the class is set to "local", the property returns/restores the rules from/to the internal storage of the class. If StaticDNS of the class is set to "global", the property returns/restores the rules from/to the GLOBAL storage. The rules list is returned and accepted in JSON format.

Tag:   Allows to store any custom data.

Use this config property to store any custom data.

TLSSessionGroup:   Specifies the group name of TLS sessions to be used for session resumption.

Use this property to limit the search of chached TLS sessions to the specified group. Sessions from other groups will be ignored. By default, all sessions are cached with an empty group name and available to all the classes.

TLSSessionLifetime:   Specifies lifetime in seconds of the cached TLS session.

Use this property to specify how much time the TLS session should be kept in the session cache. After this time, the session expires and will be automatically removed from the cache. Default value is 300 seconds (5 minutes).

TLSSessionPurgeInterval:   Specifies how often the session cache should remove the expired TLS sessions.

Use this property to specify the time interval of purging the expired TLS sessions from the session cache. Default value is 60 seconds (1 minute).

UseOwnDNSResolver:   Specifies whether the client components should use own DNS resolver.

Set this global property to false to force all the client components to use the DNS resolver provided by the target OS instead of using own one.

UseSharedSystemStorages:   Specifies whether the validation engine should use a global per-process copy of the system certificate stores.

Set this global property to false to make each validation run use its own copy of system certificate stores.

UseSystemOAEPAndPSS:   Enforces or disables the use of system-driven RSA OAEP and PSS computations.

This global setting defines who is responsible for performing RSA-OAEP and RSA-PSS computations where the private key is stored in a Windows system store and is exportable. If set to true, SBB will delegate the computations to Windows via a CryptoAPI call. Otherwise, it will export the key material and perform the computations using its own OAEP/PSS implementation.

This setting only applies to certificates originating from a Windows system store.

UseSystemRandom:   Enables or disables the use of the OS PRNG.

Use this global property to enable or disable the use of operating system-driven pseudorandom number generation.

Trappable Errors (MessageCompressor Class)

Error Handling (C++)

Call the GetLastErrorCode() method to obtain the last called method's result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. Known error codes are listed below. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.

MessageCompressor Errors

1048577   Invalid parameter (SB_ERROR_INVALID_PARAMETER)
1048578   Invalid configuration (SB_ERROR_INVALID_SETUP)
1048579   Invalid state (SB_ERROR_INVALID_STATE)
1048580   Invalid value (SB_ERROR_INVALID_VALUE)
1048581   Private key not found (SB_ERROR_NO_PRIVATE_KEY)
1048582   Cancelled by the user (SB_ERROR_CANCELLED_BY_USER)
1048583   The file was not found (SB_ERROR_NO_SUCH_FILE)
1048584   Unsupported feature or operation (SB_ERROR_UNSUPPORTED_FEATURE)
1048585   General error (SB_ERROR_GENERAL_ERROR)