Prng PureBasic Reference Documentation
Prng
Current Version: 10.1.0
Provides secure pseudo-random number generation (PRNG). Implements the Fortuna PRNG algorithm using 256-bit AES and SHA256. Also provides methods for accessing sources of system entropy.
Object Creation
obj.i = CkPrng::ckCreate()
; Make sure to dispose of the object when finished like this:
CkPrng::ckDispose(obj);
Properties
DebugLogFilePath
Declare setCkDebugLogFilePath(obj.i, value.s)
If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.
This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:
- a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
- the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
- there is an internal problem (bug) in the Chilkat code that causes the hang.
LastErrorHtml
Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.
topLastErrorText
Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.
LastErrorXml
Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.
topLastMethodSuccess
Declare setCkLastMethodSuccess(obj.i, value.i)
Indicate whether the last method call succeeded or failed. A value of 1 indicates success, a value of 0 indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:
- Any method that returns a string.
- Any method returning a Chilkat object, binary bytes, or a date/time.
- Any method returning a standard boolean status value where success = 1 and failure = 0.
- Any method returning an integer where failure is defined by a return value less than zero.
Note: Methods that do not fit the above requirements will always set this property equal to 1. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.
topPrngName
Declare setCkPrngName(obj.i, value.s)
The name of the PRNG selected. Currently, the default and only possible value is "fortuna". See the links below for information about the Fortuna PRNG.
Note: Because "fortuna" is the only valid choice, assigning this property to a different value will always be ignored (until alternative PRNG algorithms are added in the future).
VerboseLogging
Declare setCkVerboseLogging(obj.i, value.i)
If set to 1, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is 0. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.
topVersion
Methods
AddEntropy
Adds entropy to the PRNG (i.e. adds more seed material to the PRNG). Entropy can be obtained by calling GetEntropy, or the application might have its own sources for obtaining entropy. An application may continue to add entropy at desired intervals. How the entropy is used depends on the PRNG algorithm. For Fortuna, the entropy is added to the internal entropy pools and used when internal automatic reseeding occurs.
An application may add non-random entropy for testing purposes. This allows for the reproduction of the same pseudo-random number sequence for testing and debugging purposes.
The entropy bytes are passed in entropy using the binary encoding specified in encoding. Binary encodings can be "hex", "base64", etc. See the link below for supported binary encodings.
Returns 1 for success, 0 for failure.
ExportEntropy
Exports all accumulated entropy and returns it in a base64 encoded string. (Internally the entropy pools are re-hashed so that a hacker cannot determine the state of the PRNG even if the exported entropy was obtained.) When a system restarts it can import what was previously exported by calling ImportEntropy. This ensures an adequate amount of entropy is immediately available when first generating random bytes.
For example, an application could persist the exported entropy to a database or file. When the application starts again, it could import the persisted entropy, add some entropy from a system source (via the GetEntropy/AddEntropy methods), and then begin generating random data.
Returns an empty string on failure. Use the LastMethodSuccess property to check for success.
FirebasePushId
Generates a random Firebase Push ID. See Firebase Unique Identifiers.
Returns an empty string on failure. Use the LastMethodSuccess property to check for success.
GenRandom
Generates and returns numBytes random bytes in encoded string form. The binary encoding is specified by encoding, and can be "hex", "base64", etc. (See the link below for supported binary encodings.)
Important: If no entropy was explicitly added prior to first call to generate random bytes, then 32 bytes of entropy (from the system source, such as /dev/random) are automatically added to seed the PRNG.
Returns an empty string on failure. Use the LastMethodSuccess property to check for success.
GenRandomBd
Appends numBytes random bytes to bd.
Important: If no entropy was explicitly added prior to first call to generate random bytes, then 32 bytes of entropy (from the system source, such as /dev/random) are automatically added to seed the PRNG.
Returns 1 for success, 0 for failure.
GetEntropy
Reads real entropy bytes from a system entropy source and returns as an encoded string. On Linux/Unix based systems, including MAC OS X, this is accomplished by reading /dev/random. On Windows systems, it uses the Microsoft Cryptographic Service Provider's CryptGenRandom method.
It is recommended that no more than 32 bytes of entropy should be retrieved to initially seed a PRNG. Larger amounts of entropy are fairly useless. However, an app is free to periodically add bits of entropy to a long-running PRNG as it sees fit.
The encoding specifies the encoding to be used. It can be "hex", "base64", or many other possibilities. See the link below.
Returns an empty string on failure. Use the LastMethodSuccess property to check for success.
ImportEntropy
Imports entropy from previously exported entropy. See the ExportEntropy method for more information.
Returns 1 for success, 0 for failure.
RandomInt
Generates and returns a random integer between low and high (inclusive). For example, if low is 4 and high is 8, then random integers in the range 4, 5, 6, 7, 8 are returned.
RandomPassword
Generates and returns a random password of a specified length. If mustIncludeDigit is 1, the generated password will contain at least one digit (0-9). If upperAndLowercase is 1, then generated password will contain both lowercase and uppercase USASCII chars (a-z and A-Z). If mustHaveOneOf is a non-empty string, it contains the set of non-alphanumeric characters, one of which must be included in the password. For example, mustHaveOneOf might be the string "!@#$%". If excludeChars is a non-empty string, it contains chars that should be excluded from the password. A typical need would be to exclude chars that appear similar to others, such as i, l, 1, L, o, 0, O.
Returns an empty string on failure. Use the LastMethodSuccess property to check for success.
RandomString
Generates and returns a random string that may contain digits (0-9), lowercase ASCII (a-z) , and uppercase ASCII (A-Z). To include numeric digits, set bDigits equal to 1. To include lowercase ASCII, set bLower equal to 1. To include uppercase ASCII, set bUpper equal to 1. The length of the string to be generated is specified by length.
Returns an empty string on failure. Use the LastMethodSuccess property to check for success.