Csp VB.NET Reference Documentation

Csp

Current Version: 9.5.0.73

Represents a cryptographic service provider for selecting encryption, hashing, and digital signing algorithms.

This class is specific to the Windows operating system, and therefore is only available on Windows systems.

Object Creation

Dim obj As New Chilkat.Csp()

Properties

DebugLogFilePath
DebugLogFilePath As String

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:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

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EncryptAlgorithm
EncryptAlgorithm As String (ReadOnly)

Returns the name of the currently selected encryption algorithm in the currently selected CSP.

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EncryptAlgorithmID
EncryptAlgorithmID As Integer (ReadOnly)

Returns the ID of the currently selected encryption algorithm in the currently selected CSP.

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EncryptNumBits
EncryptNumBits As Integer (ReadOnly)

Returns the key-length of the currently selected encryption algorithm in the currently selected CSP.

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HashAlgorithm
HashAlgorithm As String (ReadOnly)

Returns the name of the currently selected hash algorithm in the currently selected CSP.

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HashAlgorithmID
HashAlgorithmID As Integer (ReadOnly)

Returns the ID of the currently selected hash algorithm in the currently selected CSP.

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HashNumBits
HashNumBits As Integer (ReadOnly)

Returns the bit length of the currently selected hash algorithm in the currently selected CSP.

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KeyContainerName
KeyContainerName As String

The name of the currently selected key container within the currently selected CSP. The default is typically the name of the current logged-in user.

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LastErrorHtml
LastErrorHtml As String (ReadOnly)

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.

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LastErrorText
LastErrorText As String (ReadOnly)

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.

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LastErrorXml
LastErrorXml As String (ReadOnly)

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.

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LastMethodSuccess
LastMethodSuccess As Boolean
Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of True indicates success, a value of False 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 = True and failure = False.
  • 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 True. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

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MachineKeyset
MachineKeyset As Boolean

To be documented soon.

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NumEncryptAlgorithms
NumEncryptAlgorithms As Integer (ReadOnly)

The number of encryption algorithms provided by the currently selected CSP.

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NumHashAlgorithms
NumHashAlgorithms As Integer (ReadOnly)

The number of hash algorithms provided by the currently selected CSP.

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NumKeyContainers
NumKeyContainers As Integer (ReadOnly)

The number of key containers provided by the currently selected CSP.

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NumKeyExchangeAlgorithms
NumKeyExchangeAlgorithms As Integer (ReadOnly)

The number of key exchange algorithms provided by the currently selected CSP.

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NumSignatureAlgorithms
NumSignatureAlgorithms As Integer (ReadOnly)

The number of signature algorithms provided by the currently selected CSP.

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ProviderName
ProviderName As String

The currently selected CSP. To select another CSP, simply set this property to the name of the CSP, such as "Microsoft Enhanced Cryptographic Provider v1.0". If the CSP is not available on your machine, the property value will not change. The initial and default value for this property is "Microsoft Base Cryptographic Provider v1.0".

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ProviderType
ProviderType As Integer (ReadOnly)

This is an integer representing the type of CSP. (Chilkat uses it for internal use.)

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VerboseLogging
VerboseLogging As Boolean

If set to True, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is False. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
Version As String (ReadOnly)

Version of the component/library, such as "9.5.0.63"

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Methods

GetKeyContainerNames
Function GetKeyContainerNames() As StringArray

To be documented soon...

Returns Nothing on failure

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HasEncryptAlgorithm
Function HasEncryptAlgorithm(ByVal name As String, ByVal numBits As Integer) As Boolean

Returns true if the currently selected CSP contains an encryption algorithm matching the name and key length. Otherwise returns false.

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HasHashAlgorithm
Function HasHashAlgorithm(ByVal name As String, ByVal numBits As Integer) As Boolean

Returns true if the currently selected CSP contains a hash algorithm matching the name and bit length. Otherwise returns false.

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Initialize
Function Initialize() As Boolean

Intializes the Csp with the selected ProviderName.

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NthEncryptionAlgorithm
Function NthEncryptionAlgorithm(ByVal index As Integer) As String

Returns the name of the Nth encryption algorithm provided by the currently selected CSP. Indexing begins at 0.

Returns Nothing on failure

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NthEncryptionNumBits
Function NthEncryptionNumBits(ByVal index As Integer) As Integer

Returns the key-length of the currently selected encryption algorithm in the currently selected CSP.

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NthHashAlgorithmName
Function NthHashAlgorithmName(ByVal index As Integer) As String

To be documented soon...

Returns Nothing on failure

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NthHashNumBits
Function NthHashNumBits(ByVal index As Integer) As Integer

Returns the bit length of the Nth hash algorithm provided by the currently selected CSP. Indexing begins at 0.

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NthKeyContainerName
Function NthKeyContainerName(ByVal index As Integer) As String

Returns the Nth key container name in the currently selected CSP. Indexing begins at 0.

Returns Nothing on failure

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NthKeyExchangeAlgorithm
Function NthKeyExchangeAlgorithm(ByVal index As Integer) As String

Returns the Nth key exchange algorithm provided by the currently selected CSP. Indexing begins at 0.

Returns Nothing on failure

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NthKeyExchangeNumBits
Function NthKeyExchangeNumBits(ByVal index As Integer) As Integer

Returns the bit length of the Nth key exchange algorithm provided by the currently selected CSP. Indexing begins at 0.

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NthSignatureAlgorithm
Function NthSignatureAlgorithm(ByVal index As Integer) As String

Returns the name of the Nth signature algorithm provided by the currently selected CSP. Indexing begins at 0.

Returns Nothing on failure

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NthSignatureNumBits
Function NthSignatureNumBits(ByVal index As Integer) As Integer

Returns the bit length of the Nth signature algorithm provided by the currently selected CSP. Indexing begins at 0.

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SaveLastError
Function SaveLastError(ByVal path As String) As Boolean

Saves the last-error information (the contents of LastErrorXml) to an XML formatted file.

Returns True for success, False for failure.

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SetEncryptAlgorithm
Function SetEncryptAlgorithm(ByVal name As String) As Integer

Selects an encryption algorithm. The return value is the key-length of the algorithm. If the algorithm is not available, the return value is 0. (There usually is not a need to explicitly select the key length, because the key length can be part of the name, such as "AES 128", or it is determined by the CSP. For example, the Microsoft Enhanced CSP will return a 128-bit key length for RC2, whereas the Base CSP will return a 40-bit key length.)

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SetHashAlgorithm
Function SetHashAlgorithm(ByVal name As String) As Integer

Selects a hash algorithm. The return value is the bit-length of the algorithm. If the algorithm is not available, the return value is 0.

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SetProviderMicrosoftBase
Function SetProviderMicrosoftBase() As Boolean

Sets the CSP to the Base Microsoft Cryptographic Provider, which is the default.

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SetProviderMicrosoftEnhanced
Function SetProviderMicrosoftEnhanced() As Boolean

Sets the CSP to the Enhanced Microsoft Cryptographic Provider.

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SetProviderMicrosoftRsaAes
Function SetProviderMicrosoftRsaAes() As Boolean

Sets the CSP to the Microsoft Cryptographic RSA/AES Prototype Provider.

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SetProviderMicrosoftStrong
Function SetProviderMicrosoftStrong() As Boolean

Sets the CSP to the Strong Microsoft Cryptographic Provider.

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