Jwt Tcl Reference Documentation

Jwt

Current Version: 9.5.0.97

A class for signing and verifying JWT's (JSON Web Tokens).

Object Creation

set myJwt [new CkJwt]

Properties

AutoCompact
boolean 1/0
set boolVal [CkJwt_get_AutoCompact $myJwt]
CkJwt_put_AutoCompact $myJwt $boolVal
Introduced in version 9.5.0.58

If 1, the JSON passed to CreateJwt and CreateJwtPk will be compacted to remove unnecessary whitespace. This will result in the smallest possible JWT. The default value is 1.

top
DebugLogFilePath
string
# ckStr is a CkString
CkJwt_get_DebugLogFilePath $myJwt $ckStr
set strVal [CkJwt_get_debugLogFilePath $myJwt]
CkJwt_put_DebugLogFilePath $myJwt $strVal

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.

top
LastErrorHtml
string
# ckStr is a CkString
CkJwt_get_LastErrorHtml $myJwt $ckStr
set strVal [CkJwt_get_lastErrorHtml $myJwt]

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.

top
LastErrorText
string
# ckStr is a CkString
CkJwt_get_LastErrorText $myJwt $ckStr
set strVal [CkJwt_get_lastErrorText $myJwt]

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.

top
LastErrorXml
string
# ckStr is a CkString
CkJwt_get_LastErrorXml $myJwt $ckStr
set strVal [CkJwt_get_lastErrorXml $myJwt]

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.

top
LastMethodSuccess
boolean 1/0
set boolVal [CkJwt_get_LastMethodSuccess $myJwt]
CkJwt_put_LastMethodSuccess $myJwt $boolVal

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.

top
Utf8
boolean 1/0
set boolVal [CkJwt_get_Utf8 $myJwt]
CkJwt_put_Utf8 $myJwt $boolVal

When set to 1, all "const char *" arguments are interpreted as utf-8 strings. If set to 0 (the default), then "const char *" arguments are interpreted as ANSI strings. Also, when set to 1, and Chilkat method returning a "const char *" is returning the utf-8 representation. If set to 0, all "const char *" return values are ANSI strings.

top
VerboseLogging
boolean 1/0
set boolVal [CkJwt_get_VerboseLogging $myJwt]
CkJwt_put_VerboseLogging $myJwt $boolVal

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.

top
Version
string
# ckStr is a CkString
CkJwt_get_Version $myJwt $ckStr
set strVal [CkJwt_get_version $myJwt]

Version of the component/library, such as "9.5.0.94"

More Information and Examples
top

Methods

CreateJwt
# header is a string
# payload is a string
# password is a string
# outStr is a CkString (output)
set status [CkJwt_CreateJwt $header $payload $password $outStr]
set retStr [CkJwt_createJwt $myJwt $header $payload $password]
Introduced in version 9.5.0.58

Creates a JWT. The header is the JOSE JSON header. It can be the full JOSE JSON, or it can be a shorthand string such as "HS256", "HS384", or "HS512", in which case the standard JOSE header for the given algorithm will be used.

The payload is the JSON payload that contains the claims. The password is the secret. Given that the secret is a shared passwod string, this method should only be called for creating JWT's where the JOSE header's "alg" is HS256, HS384, or HS512. For RS256, RS384, RS512, ES256, ES384, and ES512, call CreateJwtPk instead.

When successful, this method returns a JWT with the format xxxxx.yyyyy.zzzzz, where xxxxx is the base64url encoded JOSE header, yyyyy is the base64url encoded payload, and zzzzz is the base64url signature.

Returns 1 for success, 0 for failure.

top
CreateJwtPk
# header is a string
# payload is a string
# key is a CkPrivateKey
# outStr is a CkString (output)
set status [CkJwt_CreateJwtPk $header $payload $key $outStr]
set retStr [CkJwt_createJwtPk $myJwt $header $payload $key]
Introduced in version 9.5.0.58

Creates a JWT using an RSA or ECC private key. The header is the JOSE JSON header. It can be the full JOSE JSON, or it can be a shorthand string such as "RS256", "RS384", "RS512", "ES256", "ES384", or "ES512", in which case the standard JOSE header for the given algorithm will be used.

The payload is the JSON payload that contains the claims. The key is the private key. This method should only be called for creating JWT's where the JOSE header's "alg" is RS256, RS384, RS512, ES256, ES384, and ES512. If the secret is a shared password string, then call CreateJwt instead.

When successful, this method returns a JWT with the format xxxxx.yyyyy.zzzzz, where xxxxx is the base64url encoded JOSE header, yyyyy is the base64url encoded payload, and zzzzz is the base64url signature.

Returns 1 for success, 0 for failure.

top
GenNumericDate
# numSecOffset is an integer
set retInt [CkJwt_GenNumericDate $numSecOffset]
Introduced in version 9.5.0.58

Generates a JSON numeric value representing the number of seconds from 1970-01-01T00:00:00Z UTC until the specified UTC date/time, ignoring leap seconds. The date/time generated is equal to the current system time plus the number of seconds specified by numSecOffset. The numSecOffset can be negative.

More Information and Examples
top
GetHeader
# token is a string
# outStr is a CkString (output)
set status [CkJwt_GetHeader $token $outStr]
set retStr [CkJwt_getHeader $myJwt $token]
Introduced in version 9.5.0.58

Decodes the first part of a JWT (the "xxxxx" part of the "xxxxx.yyyyy.zzzzz" JWT) and returns the JSON string. This is the JOSE header of the JWT.

Returns 1 for success, 0 for failure.

More Information and Examples
top
GetPayload
# token is a string
# outStr is a CkString (output)
set status [CkJwt_GetPayload $token $outStr]
set retStr [CkJwt_getPayload $myJwt $token]
Introduced in version 9.5.0.58

Decodes the second part of a JWT (the "yyyyy" part of the "xxxxx.yyyyy.zzzzz" JWT) and returns the JSON string. This is the claims payload of the JWT.

Returns 1 for success, 0 for failure.

top
IsTimeValid
# jwt is a string
# leeway is an integer
set retBool [CkJwt_IsTimeValid $jwt $leeway]
Introduced in version 9.5.0.58

Verifies the "exp" and/or "nbf" claims and returns 1 if the current system date/time is within range. Returns 0 if the current system date/time is outside the allowed range of time. The leeway may be set to a non-zero number of seconds to allow for some small leeway (usually no more than a few minutes) to account for clock skew.

More Information and Examples
top
VerifyJwt
# token is a string
# password is a string
set status [CkJwt_VerifyJwt $token $password]
Introduced in version 9.5.0.58

Verifies a JWT that requires a shared password string for verification. The token should be a JWT with the format xxxxx.yyyyy.zzzzz. This method should only be called for JWT's using the HS256, HS384, or HS512 algorithms. The VerifyJwtPk method should be called for verifying JWT's requiring an RSA or ECC key.

Returns 1 if the signature was verified. Returns 0 if the signature was not successfully verified.

Note: This method will return 0 if the "alg" in the JOSE header is anything other than the algorithms specifically for HMAC, namely "hs256, "hs384", and "hs512". For example, if the "alg" is "none", then this method immediately returns a failed status.

Further Explanation: This method calculates the signature using the password provided by the application, and compares it against the signature found in the JWT. If the signatures are equal, then the password is correct, and 1 is returned.

Returns 1 for success, 0 for failure.

More Information and Examples
top
VerifyJwtPk
# token is a string
# key is a CkPublicKey
set status [CkJwt_VerifyJwtPk $token $key]
Introduced in version 9.5.0.58

Verifies a JWT that requires an RSA or ECC public key for verification. The token should be a JWT with the format xxxxx.yyyyy.zzzzz. This method should only be called for JWT's using the RS256, RS384, RS512, ES256, ES384, or ES512 algorithms.

Returns 1 if the signature was verified. Returns 0 if the signature was not successfully verified.

Note: This method will return 0 if the "alg" in the JOSE header is anything other than the algorithms specifically for RSA and ECC. For example, if the "alg" is "none", then this method immediately returns a failed status.

Further Explanation: This method calculates the signature using the key provided by the application, and compares it against the signature found in the JWT. If the signatures are equal, then the key corresponds to the private key used to sign, and 1 is returned.

Returns 1 for success, 0 for failure.

top