Rnd Class
Properties Methods Events Configuration Settings Errors
The Rnd class class is a basic provider of random number generation functionality.
Syntax
Rnd
Remarks
Use Rnd control to generate pseudo-random numbers or sequences. Methods like NextBytes and NextInt return the next PRNG output, whereas SeedBytes or SeedInt seed the generator with outside entropy.
It is a good idea to use one shared (singleton) Rnd object per process, as it helps spread the entropy across many part of the project, resulting in better and more secure randomization.
Property List
The following is the full list of the properties of the class with short descriptions. Click on the links for further details.
| Alphabet | Alphabet to use for random string generation. |
| FIPSMode | Reserved. |
Method List
The following is the full list of the methods of the class with short descriptions. Click on the links for further details.
| Config | Sets or retrieves a configuration setting. |
| DoAction | Performs an additional action. |
| NextBytes | Generates an array of random bytes. |
| NextInt | Generates a random integer. |
| NextPass | Generates a random password. |
| NextString | Generates a random string of characters. |
| Randomize | Seeds the random generator with a system-originating input. |
| SeedBytes | Seeds the generator with a data in a byte array. |
| SeedInt | Seeds the generator with an integer value. |
| SeedString | Seeds the generator with a string value. |
| SeedTime | Seeds the generator with current time. |
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.
| Error | Informs about errors during cryptographic operations. |
| Notification | This event notifies the application about an underlying control flow event. |
Configuration Settings
The following is a list of configuration settings for the class with short descriptions. Click on the links for further details.
| CheckKeyIntegrityBeforeUse | Enables or disable private key integrity check before use. |
| CookieCaching | Specifies whether a cookie cache should be used for HTTP(S) transports. |
| Cookies | Gets or sets local cookies for the class (supported for HTTPClient, RESTClient and SOAPClient only). |
| DefDeriveKeyIterations | Specifies the default key derivation algorithm iteration count. |
| EnableClientSideSSLFFDHE | Enables or disables finite field DHE key exchange support in TLS clients. |
| GlobalCookies | Gets or sets global cookies for all the HTTP transports. |
| HttpUserAgent | Specifies the user agent name to be used by all HTTP clients. |
| LogDestination | Specifies the debug log destination. |
| LogDetails | Specifies the debug log details to dump. |
| LogFile | Specifies the debug log filename. |
| LogFilters | Specifies the debug log filters. |
| LogFlushMode | Specifies the log flush mode. |
| LogLevel | Specifies the debug log level. |
| LogMaxEventCount | Specifies the maximum number of events to cache before further action is taken. |
| LogRotationMode | Specifies the log rotation mode. |
| MaxASN1BufferLength | Specifies the maximal allowed length for ASN.1 primitive tag data. |
| MaxASN1TreeDepth | Specifies the maximal depth for processed ASN.1 trees. |
| OCSPHashAlgorithm | Specifies the hash algorithm to be used to identify certificates in OCSP requests. |
| Tag | Allows to store any custom data. |
| UseSharedSystemStorages | Specifies whether the validation engine should use a global per-process copy of the system certificate stores. |
| UseSystemOAEPAndPSS | Enforces or disables the use of system-driven RSA OAEP and PSS computations. |
| UseSystemRandom | Enables or disables the use of the OS PRNG. |
Alphabet Property (Rnd Class)
Alphabet to use for random string generation.
Syntax
QString GetAlphabet();
int SetAlphabet(QString qsAlphabet);
Default Value
""
Remarks
Use this property to provide a list of characters to be used by NextString method. The empty value has a special meaning, and is equivalent to 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'.
Data Type
String
FIPSMode Property (Rnd Class)
Reserved.
Syntax
bool GetFIPSMode();
int SetFIPSMode(bool bFIPSMode);
Default Value
false
Remarks
This property is reserved for future use.
Data Type
Boolean
Config Method (Rnd Class)
Sets or retrieves a configuration setting.
Syntax
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
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 (Rnd Class)
Performs an additional action.
Syntax
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 of the action is provided in ActionID parameter. ActionParams contains a list of parameters for the action in the form of PARAM1=VALUE1;PARAM2=VALUE2;....
Error Handling
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.
NextBytes Method (Rnd Class)
Generates an array of random bytes.
Syntax
QByteArray NextBytes(int iLen);
Remarks
Call this method to generate an array of random bytes of length Len.
Error Handling
This method returns a Byte Array 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.
NextInt Method (Rnd Class)
Generates a random integer.
Syntax
int NextInt();
Remarks
Use this method to generate a random integer value.
Error Handling
This method returns an Integer 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.
NextPass Method (Rnd Class)
Generates a random password.
Syntax
QString NextPass(bool bLowercase, bool bUppercase, bool bDigits, bool bSpecials, int iLen);
Remarks
Use this method to generate a random password. Tune up the desired length and composition of the password using Lowercase, Uppercase, Digits, Specials, and Len parameters.
Error Handling
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.
NextString Method (Rnd Class)
Generates a random string of characters.
Syntax
QString NextString(int iLen);
Remarks
Use this method to generate a random string using characters supplied via the Alphabet property.
Error Handling
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.
Randomize Method (Rnd Class)
Seeds the random generator with a system-originating input.
Syntax
int Randomize();
Remarks
Use this method to randomize the generator by seeding it with a system-produced random input.
Error Handling
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.)
SeedBytes Method (Rnd Class)
Seeds the generator with a data in a byte array.
Syntax
int SeedBytes(QByteArray qbaValue);
Remarks
Use this method to seed the generator with data provided in a byte array.
Error Handling
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.)
SeedInt Method (Rnd Class)
Seeds the generator with an integer value.
Syntax
int SeedInt(int iIntValue);
Remarks
Use this method to seed the generator with an integer value.
Error Handling
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.)
SeedString Method (Rnd Class)
Seeds the generator with a string value.
Syntax
int SeedString(const QString& qsStrValue);
Remarks
Use this method to seed the generator with a string value.
Error Handling
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.)
SeedTime Method (Rnd Class)
Seeds the generator with current time.
Syntax
int SeedTime();
Remarks
Use this method to seed the generator with current system time.
Error Handling
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 (Rnd Class)
Informs about errors during cryptographic operations.
Syntax
class RndErrorEventParams {
public:
int ErrorCode();
const QString &Description();
int EventRetVal();
void SetEventRetVal(int iRetVal);
};
// To handle, connect one or more slots to this signal.
void Error(RndErrorEventParams *e);
// Or, subclass Rnd and override this emitter function.
virtual int FireError(RndErrorEventParams *e) {...}
Remarks
Class fires this event if an error happens during a cryptographic operation.
ErrorCode contains an error code and Description contains a textual description of the error that happened.
Notification Event (Rnd Class)
This event notifies the application about an underlying control flow event.
Syntax
class RndNotificationEventParams {
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(RndNotificationEventParams *e);
// Or, subclass Rnd and override this emitter function.
virtual int FireNotification(RndNotificationEventParams *e) {...}
Remarks
The class fires this event to let the application know about some event, occurrence, or milestone in the component. 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 EventID parameter. EventParam contains any parameters accompanying the occurrence. Depending on the type of the component, the exact action it is performing, or the document being processed, one or both may be omitted.
Configuration Settings (Rnd 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.Base Configuration 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. |
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| 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:
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| Cookies: Gets or sets local cookies for the class (supported for HTTPClient, RESTClient and SOAPClient only).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. |
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| 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:
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| 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:
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| 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:
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LogFlushMode:
Specifies the log flush mode.Use this property to set the log flush mode. The following values are defined:
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| LogLevel:
Specifies the debug log level.Use this property to provide the desired debug log level.
Supported values are:
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| 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. |
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LogRotationMode:
Specifies the log rotation mode.Use this property to set the log rotation mode. The following values are defined:
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| 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. | ||||||||||||||||||||||||||||||
| Tag: Allows to store any custom data.Use this config property to store any custom data. | ||||||||||||||||||||||||||||||
| 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. |
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| 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 (Rnd Class)
Rnd Errors
| 1048577 Invalid parameter value (SB_ERROR_INVALID_PARAMETER) | |
| 1048578 Class is configured incorrectly (SB_ERROR_INVALID_SETUP) | |
| 1048579 Operation cannot be executed in the current state (SB_ERROR_INVALID_STATE) | |
| 1048580 Attempt to set an invalid value to a property (SB_ERROR_INVALID_VALUE) | |
| 1048581 Certificate does not have its private key loaded (SB_ERROR_NO_PRIVATE_KEY) | |
| 1048581 Cancelled by the user (SB_ERROR_CANCELLED_BY_USER) |