Jws C Reference Documentation

Jws

Current Version: 9.5.0.73

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

Create/Dispose

HCkJws instance = CkJws_Create();
// ...
CkJws_Dispose(instance);
HCkJws CkJws_Create(void);

Creates an instance of the HCkJws object and returns a handle ("void *" pointer). The handle is passed in the 1st argument for the functions listed on this page.

void CkJws_Dispose(HCkJws handle);

Objects created by calling CkJws_Create must be freed by calling this method. A memory leak occurs if a handle is not disposed by calling this function. Also, any handle returned by a Chilkat "C" function must also be freed by the application by calling the appropriate Dispose method, such as CkJws_Dispose.

Properties

DebugLogFilePath
void CkJws_getDebugLogFilePath(HCkJws cHandle, HCkString retval);
void CkJws_putDebugLogFilePath(HCkJws cHandle, const char *newVal);
const char *CkJws_debugLogFilePath(HCkJws cHandle);

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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LastErrorHtml
void CkJws_getLastErrorHtml(HCkJws cHandle, HCkString retval);
const char *CkJws_lastErrorHtml(HCkJws cHandle);

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
void CkJws_getLastErrorText(HCkJws cHandle, HCkString retval);
const char *CkJws_lastErrorText(HCkJws cHandle);

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
void CkJws_getLastErrorXml(HCkJws cHandle, HCkString retval);
const char *CkJws_lastErrorXml(HCkJws cHandle);

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
BOOL CkJws_getLastMethodSuccess(HCkJws cHandle);
void CkJws_putLastMethodSuccess(HCkJws cHandle, BOOL newVal);
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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NumSignatures
int CkJws_getNumSignatures(HCkJws cHandle);
Introduced in version 9.5.0.66

The number of signatures contained in this JWS.

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PreferCompact
BOOL CkJws_getPreferCompact(HCkJws cHandle);
void CkJws_putPreferCompact(HCkJws cHandle, BOOL newVal);
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.

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PreferFlattened
BOOL CkJws_getPreferFlattened(HCkJws cHandle);
void CkJws_putPreferFlattened(HCkJws cHandle, BOOL newVal);
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.

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Utf8
BOOL CkJws_getUtf8(HCkJws cHandle);
void CkJws_putUtf8(HCkJws cHandle, BOOL newVal);

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

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VerboseLogging
BOOL CkJws_getVerboseLogging(HCkJws cHandle);
void CkJws_putVerboseLogging(HCkJws cHandle, BOOL newVal);

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
void CkJws_getVersion(HCkJws cHandle, HCkString retval);
const char *CkJws_version(HCkJws cHandle);

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

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Methods

CreateJws
BOOL CkJws_CreateJws(HCkJws cHandle, HCkString outStr);
const char *CkJws_createJws(HCkJws cHandle);
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 TRUE for success, FALSE for failure.

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CreateJwsSb
BOOL CkJws_CreateJwsSb(HCkJws cHandle, HCkStringBuilder sbJws);
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.

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GetPayload
BOOL CkJws_GetPayload(HCkJws cHandle, const char *charset, HCkString outStr);
const char *CkJws_getPayload(HCkJws cHandle, const char *charset);
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 TRUE for success, FALSE for failure.

More Information and Examples
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GetPayloadBd
BOOL CkJws_GetPayloadBd(HCkJws cHandle, HCkBinData binData);
Introduced in version 9.5.0.66

Returns the JWS payload by appending it to the binData.

Returns TRUE for success, FALSE for failure.

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GetPayloadSb
BOOL CkJws_GetPayloadSb(HCkJws cHandle, const char *charset, HCkStringBuilder sbPayload);
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.

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GetProtectedHeader
HCkJsonObject CkJws_GetProtectedHeader(HCkJws cHandle, int index);
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 NULL on failure

More Information and Examples
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GetUnprotectedHeader
HCkJsonObject CkJws_GetUnprotectedHeader(HCkJws cHandle, int index);
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 NULL on failure

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LoadJws
BOOL CkJws_LoadJws(HCkJws cHandle, const char *jwsStr);
Introduced in version 9.5.0.66

Loads a JWS contained in jwsStr.

Returns TRUE for success, FALSE for failure.

More Information and Examples
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LoadJwsSb
BOOL CkJws_LoadJwsSb(HCkJws cHandle, HCkStringBuilder sbJws);
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
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SaveLastError
BOOL CkJws_SaveLastError(HCkJws cHandle, const char *path);

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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SetMacKey
BOOL CkJws_SetMacKey(HCkJws cHandle, int index, const char *key, const char *encoding);
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
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SetMacKeyBd
BOOL CkJws_SetMacKeyBd(HCkJws cHandle, int index, HCkBinData key);
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.

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SetPayload
BOOL CkJws_SetPayload(HCkJws cHandle, const char *payload, const char *charset, BOOL includeBom);
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
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SetPayloadBd
BOOL CkJws_SetPayloadBd(HCkJws cHandle, HCkBinData binData);
Introduced in version 9.5.0.66

Sets the JWS payload from the contents of binData.

Returns TRUE for success, FALSE for failure.

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SetPayloadSb
BOOL CkJws_SetPayloadSb(HCkJws cHandle, HCkStringBuilder sbPayload, const char *charset, BOOL includeBom);
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.

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SetPrivateKey
BOOL CkJws_SetPrivateKey(HCkJws cHandle, int index, HCkPrivateKey privKey);
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.

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SetProtectedHeader
BOOL CkJws_SetProtectedHeader(HCkJws cHandle, int index, HCkJsonObject json);
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
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SetPublicKey
BOOL CkJws_SetPublicKey(HCkJws cHandle, int index, HCkPublicKey pubKey);
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.

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SetUnprotectedHeader
BOOL CkJws_SetUnprotectedHeader(HCkJws cHandle, int index, HCkJsonObject json);
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.

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Validate
int CkJws_Validate(HCkJws cHandle, int index);
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.

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