Jws Excel Class Module Reference Documentation

Jws

Current Version: 9.5.0.90

Requires Chilkat Bundle License

An API for JSON Web Signature (JWS). Provides the ability to create and verify JWSs.

Object Creation

Dim oJws As Chilkat.Jws
Set oJws = Chilkat.NewJws

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:

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

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.

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.

More Information and Examples

Concept of LastErrorText LastErrorText Standard Information

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.

LastMethodSuccess

LastMethodSuccess As Long

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.

NumSignatures

NumSignatures As Long (read only)

Introduced in version 9.5.0.66

The number of signatures contained in this JWS.

PreferCompact

PreferCompact As Long

Introduced in version 9.5.0.66

Controls whether to use the JWS Compact Serialization or JWS JSON Serialization when creating JWSs. The default value is True, which is to choose the compact serialization when possible. If multiple signatures exist, or if any unprotected headers exist, then JWS JSON Serialization is used regardless of this property setting.

PreferFlattened

PreferFlattened As Long

Introduced in version 9.5.0.66

Controls whether to use the flattened or general JWE JSON Serialization when creating JWSs. The default value is True, which is to choose the flattened serialization when possible. If multiple signatures exist, then the general (non-flattened) JWS JSON Serialization is used regardless of this property setting.

VerboseLogging

VerboseLogging As Long

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.

Version

Version As String (read only)

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

Methods

CreateJws

CreateJws() As String

Introduced in version 9.5.0.66

Creates and returns the JWS containing one or more signatures according to the previously set payload, headers, and keys.

Returns Nothing on failure

More Information and Examples

JWS Using HMAC SHA-256 Create a JWS Using ECDSA P-256 SHA-256 Create a JWS Using ECDSA P-521 SHA-512

CreateJwsSb

CreateJwsSb(sbJws As StringBuilder) As Long

Introduced in version 9.5.0.66

Creates and returns the JWS by appending it to the contents of sbJws.

Returns True for success, False for failure.

GetPayload

GetPayload(charset As String) As String

Introduced in version 9.5.0.66

Returns the JWS payload. The charset specifies the byte representation to be used in interpreting the bytes of the payload. (For example, "utf-8", "windows-1252", "utf-16", etc.)

Returns Nothing on failure

More Information and Examples

JWS Using HMAC SHA-256

GetPayloadBd

GetPayloadBd(binData As BinData) As Long

Introduced in version 9.5.0.66

Returns the JWS payload by appending it to the binData.

Returns True for success, False for failure.

GetPayloadSb

GetPayloadSb(charset As String, sbPayload As StringBuilder) As Long

Introduced in version 9.5.0.66

Returns the JWS payload by appending it to the sbPayload. The charset specifies the byte representation to be used in interpreting the bytes of the payload. (For example, "utf-8", "windows-1252", "utf-16", etc.)

Returns True for success, False for failure.

GetProtectedHeader

GetProtectedHeader(index As Long) As JsonObject

Introduced in version 9.5.0.66

Returns the protected header for the Nth signature. The index is the index of the signature. The 1st signature is at index 0. In most cases, a JWS contains a single signature at index 0.

Returns Nothing on failure

More Information and Examples

JWS Using HMAC SHA-256

GetUnprotectedHeader

GetUnprotectedHeader(index As Long) As JsonObject

Introduced in version 9.5.0.66

Returns the optional unprotected header for the Nth signature. The index is the index of the signature. The 1st signature is at index 0. In most cases, a JWS contains a single signature at index 0.

Returns Nothing on failure

LoadJws

LoadJws(jwsStr As String) As Long

Introduced in version 9.5.0.66

Loads a JWS contained in jwsStr.

Returns True for success, False for failure.

More Information and Examples

JWS Using HMAC SHA-256

LoadJwsSb

LoadJwsSb(sbJws As StringBuilder) As Long

Introduced in version 9.5.0.66

Loads a JWS from the contents of sbJws.

Returns True for success, False for failure.

More Information and Examples

Validate JWS Using RSASSA-PKCS1-v1_5 SHA-256

SetMacKey

SetMacKey(index As Long, key As String, encoding As String) As Long

Introduced in version 9.5.0.66

Sets the MAC key to be used for creating or validating a signature for the algorithms "HS256", "HS384", or "HS512". The key is an encoded string representation of the MAC key bytes. The encoding is an encoding, such as "base64url", "base64", "hex", etc. The 1st signature is at index 0. (Most JWSs only contain a single signature.)

Returns True for success, False for failure.

More Information and Examples

JWS Using HMAC SHA-256

SetMacKeyBd

SetMacKeyBd(index As Long, key As BinData) As Long

Introduced in version 9.5.0.66

Sets the MAC key to be used for creating or validating a signature for the algorithms "HS256", "HS384", or "HS512". The key contains the binary bytes of the MAC key for the Nth signature. The 1st signature is at index 0.

Returns True for success, False for failure.

SetPayload

SetPayload(payload As String, charset As String, includeBom As Boolean) As Long

Introduced in version 9.5.0.66

Sets the JWS payload from the contents of payload. The charset specifies the byte representation to be used for the string that is to be the payload. (For example, "utf-8", "windows-1252", "utf-16", etc.). If includeBom is True, then the byte-order-mark (BOM), also known as preamble, if one exists for the given charset, is included in the payload. Normally, includeBom should be set to False.

Returns True for success, False for failure.

More Information and Examples

JWS Using HMAC SHA-256

SetPayloadBd

SetPayloadBd(binData As BinData) As Long

Introduced in version 9.5.0.66

Sets the JWS payload from the contents of binData.

Returns True for success, False for failure.

SetPayloadSb

SetPayloadSb(sbPayload As StringBuilder, charset As String, includeBom As Boolean) As Long

Introduced in version 9.5.0.66

Sets the JWS payload from the contents of sbPayload. The charset specifies the byte representation to be used for the string that is to be the payload. (For example, "utf-8", "windows-1252", "utf-16", etc.). If includeBom is True, then the byte-order-mark (BOM), also known as preamble, if one exists for the given charset, is included in the payload. Normally, includeBom should be set to False.

Returns True for success, False for failure.

SetPrivateKey

SetPrivateKey(index As Long, privKey As PrivateKey) As Long

Introduced in version 9.5.0.66

Sets the private key (ECC or RSA) to be used in creating a signature for the following algorithms:

RS256
RS384
RS512
ES256
ES384
ES512
PS256
PS384
PS512

The JWS algorithms are described in RFC 7518, section 3.1. Here is a summary:

   +--------------+-------------------------------+--------------------+
   | "alg" Param  | Digital Signature or MAC      | Implementation     |
   | Value        | Algorithm                     | Requirements       |
   +--------------+-------------------------------+--------------------+
   | HS256        | HMAC using SHA-256            | Required           |
   | HS384        | HMAC using SHA-384            | Optional           |
   | HS512        | HMAC using SHA-512            | Optional           |
   | RS256        | RSASSA-PKCS1-v1_5 using       | Recommended        |
   |              | SHA-256                       |                    |
   | RS384        | RSASSA-PKCS1-v1_5 using       | Optional           |
   |              | SHA-384                       |                    |
   | RS512        | RSASSA-PKCS1-v1_5 using       | Optional           |
   |              | SHA-512                       |                    |
   | ES256        | ECDSA using P-256 and SHA-256 | Recommended+       |
   | ES384        | ECDSA using P-384 and SHA-384 | Optional           |
   | ES512        | ECDSA using P-521 and SHA-512 | Optional           |
   | PS256        | RSASSA-PSS using SHA-256 and  | Optional           |
   |              | MGF1 with SHA-256             |                    |
   | PS384        | RSASSA-PSS using SHA-384 and  | Optional           |
   |              | MGF1 with SHA-384             |                    |
   | PS512        | RSASSA-PSS using SHA-512 and  | Optional           |
   |              | MGF1 with SHA-512             |                    |
   | none         | No digital signature or MAC   | Optional           |
   |              | performed                     |                    |
   +--------------+-------------------------------+--------------------+

Returns True for success, False for failure.

SetProtectedHeader

SetProtectedHeader(index As Long, json As JsonObject) As Long

Introduced in version 9.5.0.66

Sets a signature's protected header. The index is the index of the signature. The 1st signature is at index 0. In most cases, a JWS contains a single signature at index 0.

Returns True for success, False for failure.

More Information and Examples

JWS Using HMAC SHA-256

SetPublicKey

SetPublicKey(index As Long, pubKey As PublicKey) As Long

Introduced in version 9.5.0.66

Sets the public key (ECC or RSA) to be used in validating a signature for the following algorithms:

RS256
RS384
RS512
ES256
ES384
ES512
PS256
PS384
PS512

Returns True for success, False for failure.

SetUnprotectedHeader

SetUnprotectedHeader(index As Long, json As JsonObject) As Long

Introduced in version 9.5.0.66

Sets a signature's optional unprotected header. The index is the index of the signature. The 1st signature is at index 0. In most cases, a JWS contains a single signature at index 0.

Returns True for success, False for failure.

Validate

Validate(index As Long) As Long

Introduced in version 9.5.0.66

Validates the Nth signature or MAC using the Nth public key or MAC key.

Returns 1 if the signature was validated, thus verifying that the signer used the same MAC key or the matching private key.
Returns 0 if the incorrect public key or MAC key was provided.
Returns -1 for any other error, such as if no public key or MAC key was previously set for the given index.

Prior to calling this method, a program should provide the public key or MAC key via the SetPublicKey, SetMacKey, or SetMacKeyBd methods.

More Information and Examples

JWS Using HMAC SHA-256 Validate JWS Using RSASSA-PKCS1-v1_5 SHA-256 Validate a JWS Using ECDSA P-256 SHA-256 Validate JWS with Multiple Signatures using the General JSON Serialization Format