Dsa ActiveX Reference Documentation

Dsa

Current Version: 9.5.0.73

The Digital Signature Algorithm (DSA) is a United States Federal Government standard or FIPS for digital signatures. It was proposed by the National Institute of Standards and Technology (NIST) in August 1991 for use in their Digital Signature Standard (DSS).

Object Creation

(Visual Basic 6.0)
Dim obj As New ChilkatDsa

(ASP)
set obj = Server.CreateObject("Chilkat_9_5_0.Dsa")

(VBScript)
set obj = CreateObject("Chilkat_9_5_0.Dsa")

(Delphi)
obj := TChilkatDsa.Create(Self);

(FoxPro)
loObject = CreateObject('Chilkat_9_5_0.Dsa')

(PowerBuilder)
lole_object = create oleobject
li_rc = lole_object.ConnectToNewObject("Chilkat_9_5_0.Dsa")

(SQL Server)
EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Dsa', @obj OUT

(Javascript)
var obj = new ActiveXObject("Chilkat_9_5_0.Dsa");

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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GroupSize
GroupSize As Long

The group size (in bits) to be used in DSA key generation. The default value is 160 and corresponds to the fact that SHA-1 is used in signature generation. This property setting should not be changed. It exists for future expansion when additional underlying hash algorithms are supported.

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Hash
Hash As Variant

The hash to be signed or verified via the SignHash and Verify methods. In both cases, the Hash should be set prior to calling SignHash or Verify. This property may also be set via the SetEncodedHash method.

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HexG
HexG As String (read-only)

The "G" part of a public or private DSA key returned as a hex-encoded SSH1-format bignum. The "G" is the generator. DSA key params consist of G, P, and Q.

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HexP
HexP As String (read-only)

The "P" part of a public or private DSA key returned as a hex-encoded SSH1-format bignum. The "P" is a large prime. DSA key params consist of G, P, and Q.

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HexQ
HexQ As String (read-only)

The "Q" part of a public or private DSA key returned as a hex-encoded SSH1-format bignum. DSA key params consist of G, P, and Q.

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HexX
HexX As String (read-only)

The "X" part of a DSA private key returned as a hex-encoded SSH1-format bignum.

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HexY
HexY As String (read-only)

The "Y" part of a DSA public key returned as a hex-encoded SSH1-format bignum. (The "Y" value is also accessible w/ a private key, but the "X" value is not available in a DSA public key.)

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LastBinaryResult
LastBinaryResult As Variant (read-only)
Introduced in version 9.5.0.52

The binary data returned by the last (binary data returning) method called. Only available if Chilkat.Global.KeepBinaryResult is set to 1. This provides a means for obtaining large varbinary results in the SQL Server environment (where limitations exist in getting large amounts of data returned by method calls, but where temp tables can be used for binary properties).

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LastErrorHtml
LastErrorHtml As String (read-only)

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 (read-only)

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 (read-only)

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 Long
Introduced in version 9.5.0.52

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.

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LastStringResult
LastStringResult As String (read-only)
Introduced in version 9.5.0.52

The string return value of the last (string returning) method called. Only available if Chilkat.Global.KeepStringResult is set to 1. This provides a means for obtaining large string results in the SQL Server environment (where limitations exist in getting long strings returned by method calls, but where temp tables can be used for string properties).

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LastStringResultLen
LastStringResultLen As Long (read-only)
Introduced in version 9.5.0.53

The length, in characters, of the string contained in the LastStringResult property.

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Signature
Signature As Variant

The signature created by calling SignHash. If verifying a signature, this may be set prior to calling the Verify method.

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VerboseLogging
VerboseLogging As Long

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.

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Version
Version As String (read-only)

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

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Methods

FromDer
FromDer(derData As Variant) As Long

Loads a DSA private key from in-memory DSA DER encoded bytes.

Returns 1 for success, 0 for failure.

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FromDerFile
FromDerFile(path As String) As Long

Loads a DSA private key from a DER-encoded file.

Returns 1 for success, 0 for failure.

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FromEncryptedPem
FromEncryptedPem(password As String, pemData As String) As Long

Loads a DSA private key from an in-memory encrypted PEM-formatted string. If the PEM passed to this method is unencrypted, the password is ignored and the PEM is simply loaded.

Returns 1 for success, 0 for failure.

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FromPem
FromPem(pemData As String) As Long

Loads a DSA private key from an in-memory unencrypted PEM-formatted string.

Returns 1 for success, 0 for failure.

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FromPublicDer
FromPublicDer(derData As Variant) As Long

Loads a DSA public key from an in-memory DER-encoded byte array.

Returns 1 for success, 0 for failure.

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FromPublicDerFile
FromPublicDerFile(path As String) As Long

Loads a DSA public key from a DER-encoded file.

Returns 1 for success, 0 for failure.

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FromPublicPem
FromPublicPem(pemData As String) As Long

Loads a DSA public-key from an in-memory PEM string.

Returns 1 for success, 0 for failure.

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FromXml
FromXml(xmlKey As String) As Long

Loads a DSA public or private key from an in-memory XML string.

Returns 1 for success, 0 for failure.

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GenKey
GenKey(ByVal numBits As Long) As Long

Generates a new DSA key that is numBits bits in length. The numBits should be at least 1024 bits and a multiple of 64. Typical values are 1024 and 2048. The newly generated key may be exported by calling one of the To* methods.

Returns 1 for success, 0 for failure.

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GenKeyFromParamsDer
GenKeyFromParamsDer(derBytes As Variant) As Long

Generates a new DSA key from in-memory DER parameters created by OpenSSL. The newly generated key may be exported by calling one of the To* methods.

Returns 1 for success, 0 for failure.

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GenKeyFromParamsDerFile
GenKeyFromParamsDerFile(path As String) As Long

Generates a new DSA key from a DER-format parameters file created by OpenSSL. An example of using OpenSSL to generate DSA parameters in DER format is:

openssl dsaparam -outform DER 1024 < seedData.xml > dsaparam.der
The newly generated key may be exported by calling one of the To* methods.

Returns 1 for success, 0 for failure.

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GenKeyFromParamsPem
GenKeyFromParamsPem(pem As String) As Long

Generates a new DSA key from parameters (PEM formatted string) created by OpenSSL. The newly generated key may be exported by calling one of the To* methods.

Returns 1 for success, 0 for failure.

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GenKeyFromParamsPemFile
GenKeyFromParamsPemFile(path As String) As Long

Generates a new DSA key from a PEM parameters file created by OpenSSL. The newly generated key may be exported by calling one of the To* methods.

OpenSSL provides the ability to generate DSA key parameters. For example:

openssl dsaparam 1024 < seedData.txt > dsaparam.pem

Here is a sample DSA parameters PEM:

-----BEGIN DSA PARAMETERS-----
MIIBHgKBgQCXIAx4XzLVZ5ZqOFzdsYWVyH/6E/mVPw4TgMZS6Wxajnbdn1/CUBzE
RWTUp8SguTSDpjC1Q/nyno0G6Q96VoW+PUXv8qUph8vbSaEdsjYO/8jSfzkGfvsa
cucr1ythfNyk63aZAKzxeutOmsVe77l6pZI96ROjWF5iizuUB4WgmwIVANxM70wH
8iPPYVzPZqtXCB66I2SnAoGAIbW2VYRjRdoA7trJgmnfWakghKwV1WyaYrotqeDE
07/dipp0cNuY0IAJgSmqLHlAkNa2ZNI/c1mNxcwhYzZrnn8CXIqrYmtI33w0PYCx
KHPqj7puhddFwYS/rFiyWAN0jtCMHlfCVzFGbSzach5QQraPV9YApJXy+ORJ8VPU
/zo=
-----END DSA PARAMETERS-----

Returns 1 for success, 0 for failure.

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GetEncodedHash
GetEncodedHash(encoding As String) As String

Returns the bytes of the Hash property as a hex or base64 encoded string. The encoding should be set to either "hex" or "base64".

Returns Nothing on failure

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GetEncodedSignature
GetEncodedSignature(encoding As String) As String

Returns the bytes of the Signature property as a hex or base64 encoded string. The encoding should be set to either "hex" or "base64". The Signature property is set when SignHash is called.

Returns Nothing on failure

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LoadText
LoadText(path As String) As String

Convenience method to load the entire contents of a text file into a string. It is assumed that the text contains ANSI encoded character data.

Returns Nothing on failure

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SaveText
SaveText(strToSave As String, path As String) As Long

Convenience method to save a string to a text file. The text is saved using the ANSI character encoding.

Returns 1 for success, 0 for failure.

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SetEncodedHash
SetEncodedHash(encoding As String, encodedHash As String) As Long

Provides a way to set the Hash property by passing an encoded string. The encoding can be "hex" or "base64". The encodedHash contains the encoded bytes of the hash that will be signed or verified via the SignHash and Verify methods.

Returns 1 for success, 0 for failure.

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SetEncodedSignature
SetEncodedSignature(encoding As String, encodedSig As String) As Long

Sets the bytes of the Signature property. (The signature must be specified prior to calling the Verify method.) This method allows for the signature to be set via a hex or base64 encoded string. The encoding should be set to either "hex" or "base64".

Returns 1 for success, 0 for failure.

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SetEncodedSignatureRS
SetEncodedSignatureRS(encoding As String, encodedR As String, encodedS As String) As Long

Sets the bytes of the Signature property by providing the R and S values in encoded form. (The signature must be specified prior to calling the Verify method.) The R and S values may be set via a hex or base64 encoded string. The encoding should be set to either "hex" or "base64".

Returns 1 for success, 0 for failure.

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SetKeyExplicit
SetKeyExplicit(ByVal groupSizeInBytes As Long, pHex As String, qHex As String, gHex As String, xHex As String) As Long

Sets the DSA object's private key from explicitly provided pHex, qHex, gHex, and xHex values. The groupSizeInBytes specifies the group size (in bytes). It is typically equal to 20, which is the length of the underlying hash function (SHA-1) for signing. The pHex, qHex, gHex, and xHex values are hex-encoded SSH1-format bignums.

Returns 1 for success, 0 for failure.

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SetPubKeyExplicit
SetPubKeyExplicit(ByVal groupSizeInBytes As Long, pHex As String, qHex As String, gHex As String, yHex As String) As Long

Sets the DSA object's private key from explicitly provided pHex, qHex, gHex, and yHex values. The groupSizeInBytes specifies the group size (in bytes). It is typically equal to 20, which is the length of the underlying hash function (SHA-1) for signing. The pHex, qHex, gHex, and yHex values are hex-encoded SSH1-format bignums.

Returns 1 for success, 0 for failure.

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SignHash
SignHash() As Long

Signs a hash using the digital signature algorithm. Before calling this method, set the hash to be signed by either calling SetEncodedHash or by setting the Hash property. If SignHash returns 1, the signature may be retrieved by either calling GetEncodedHash, or by accessing the Signature property.

Returns 1 for success, 0 for failure.

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ToDer
ToDer() As Variant

Writes the DSA private key to a DER-encoded byte array.

Returns a zero-length byte array (as a Variant) on failure.
An empty array will have a UBound of -1 meaning 0 elements.

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ToDerFile
ToDerFile(path As String) As Long

Writes the DSA private key to a DER-format file.

Returns 1 for success, 0 for failure.

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ToEncryptedPem
ToEncryptedPem(password As String) As String

Writes the DSA private key to an in-memory encrypted PEM string.

Returns Nothing on failure

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ToPem
ToPem() As String

Writes the DSA private key to an in-memory PEM string.

Returns Nothing on failure

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ToPublicDer
ToPublicDer() As Variant

Writes the DSA public key to a DER-encoded byte array.

Returns a zero-length byte array (as a Variant) on failure.
An empty array will have a UBound of -1 meaning 0 elements.

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ToPublicDerFile
ToPublicDerFile(path As String) As Long

Writes the DSA public key to a DER-format file.

Returns 1 for success, 0 for failure.

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ToPublicPem
ToPublicPem() As String

Writes the DSA public key to an in-memory PEM string.

Returns Nothing on failure

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ToXml
ToXml(ByVal bPublicOnly As Long) As String

Writes the DSA private or public key to an in-memory XML string. The bPublicOnly determines whether the public or private key is written.

Returns Nothing on failure

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UnlockComponent
UnlockComponent(unlockCode As String) As Long

Unlocks the component. This must be called once prior to calling any other method.

Returns 1 for success, 0 for failure.

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Verify
Verify() As Long

Verifies a DSA signature. The Hash and Signature properties must be set prior to calling this method. (These properties may also be set via the SetEncodedHash and SetEncodedSignature methods.)

Returns 1 for success, 0 for failure.

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VerifyKey
VerifyKey() As Long

Verifies that the public or private key contained in the calling Dsa object is valid. Returns 1 if valid, otherwise returns 0.

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