Rhonabwy - Javascript Object Signing and Encryption (JOSE) library - JWK, JWKS, JWS, JWE and JWT

• Create, modify, parse, import or export JSON Web Keys (JWK) and JSON Web Keys Set (JWKS)
• Create, modify, parse, validate or serialize JSON Web Signatures (JWS)
• Create, modify, parse, validate or serialize JSON Web Encryption (JWE)
• Create, modify, parse, validate or serialize JSON Web Token (JWT)

JWT Relies on JWS and JWE functions, so it supports the same functionalities as the other 2. JWT functionalities also support nesting serialization (JWE nested in a JWS or the opposite).

• Supported Cryptographic Algorithms (alg) for Digital Signatures and MACs:

(1) GnuTLS 3.6 minimum is required for ECDSA, Ed25519 (EdDSA) and RSA-PSS signatures.

• Supported Encryption Algorithm (enc) for JWE payload encryption:

(2) GnuTLS 3.6.14 minimum is required for A192GCM enc.

• Supported Cryptographic Algorithms (alg) for Key Management:

(3) Nettle 3.4 minimum is required for RSA-OAEP and AES key Wrap

(4) Nettle 3.6 minimum is required for ECDH-ES

(5) GnuTLS 3.6.14 minimum is required for A192GCMKW, PBES2-HS256+A128KW, PBES2-HS384+A192KW and PBES2-HS512+A256KW key wrapping algorithms.

rnbyc, Rhonabwy command-line tool

This command-line program can be used to:

• Generate and/or parse keys and output the result in a JWKS or a public/private pair of JWKS files.
• Parse, decrypt, and/or verify signature of a JWT, using given key
• Serialize a JWT, the JWT can be signed, encrypted or nested

Example commands to generate a RSA2048 key pair, serialize a JWT signed with the private key, then parse the serialized token and verifies the signature with the public key.

$ rnbyc -j -g RSA2048 -o priv.jwks -p pub.jwks
$ rnbyc -s '{"iss":"https://rhonabwy.tld","aud":"abcxyz1234"}' -K priv.jwks -a RS256
eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImVNdnI3bktBX2I5QUI4NGpMU05zTFFKZHRmdHpadnllV2M1V0VVMjhnRFkifQ.eyJpc3MiOiJodHRwczovL3Job25hYnd5LnRsZCIsImF1ZCI6ImFiY3h5ejEyMzQifQ.j6v-yxcWvHhyLIc-r3Nzn5rCF9yeJJzgyLSHW_10wREfckspbzf8UTof5Zsrwg8JvKNlJ4Tt4ZffJC4BkkehdBYXPrgcfq9NtvNYsRmAdiNJhOXtZCU9j9X89j2xhY7pRBgWENI9c3730cmAUgaC-IUKsoNRw_dd-eboyrgYKIzUCYRnuwqDB31T2oUSVjy6CckoenyoeHJhHg-x384G-g4ovP1l-L4YpjgCyr6BR8mjBFwHU56MP6hNN299HpUd56usQ3vMn7z5hL6QqE92qz-SsJBySrv8whLWjjN9J4Wq5g3_R7Qw00x60bFnuCDhPBjg3EPXXGqlI0x0vwgwHw
$ rnbyc -P pub.jwks -t eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImtpZCI6ImVNdnI3bktBX2I5QUI4NGpMU05zTFFKZHRmdHpadnllV2M1V0VVMjhnRFkifQ.eyJpc3MiOiJodHRwczovL3Job25hYnd5LnRsZCIsImF1ZCI6ImFiY3h5ejEyMzQifQ.j6v-yxcWvHhyLIc-r3Nzn5rCF9yeJJzgyLSHW_10wREfckspbzf8UTof5Zsrwg8JvKNlJ4Tt4ZffJC4BkkehdBYXPrgcfq9NtvNYsRmAdiNJhOXtZCU9j9X89j2xhY7pRBgWENI9c3730cmAUgaC-IUKsoNRw_dd-eboyrgYKIzUCYRnuwqDB31T2oUSVjy6CckoenyoeHJhHg-x384G-g4ovP1l-L4YpjgCyr6BR8mjBFwHU56MP6hNN299HpUd56usQ3vMn7z5hL6QqE92qz-SsJBySrv8whLWjjN9J4Wq5g3_R7Qw00x60bFnuCDhPBjg3EPXXGqlI0x0vwgwHw
Token signature verified
{
  "iss": "https://rhonabwy.tld",
  "aud": "abcxyz1234"
}

Check its documentation

API Documentation

Documentation is available in the documentation page: https://babelouest.github.io/rhonabwy/

Example program to parse and verify the signature of a JWT using its public key in JWK format:

/**
 * To compile this program run:
 * gcc -o demo_rhonabwy demo_rhonabwy.c -lrhonabwy
 */
#include <stdio.h>
#include <rhonabwy.h>

int main(void) {
  const char token[] = "eyJ0eXAiOiJKV1QiLCJhbGciOiJFUzI1NiIsImtpZCI6IjEifQ."                                     // Header
                       "eyJzdHIiOiJwbG9wIiwiaW50Ijo0Miwib2JqIjp0cnVlfQ."                                         // Claims
                       "ooXNEt3JWFGMuvkGUM-szUOU1QTu4DvyC3qQP64UGeeJQuMGupBCVATnGkiqNLiPSJ9uBsjZbyUrWe8z7Iag_A"; // Signature

  const char jwk_pubkey_ecdsa_str[] = "{"
                                        "\"kty\":\"EC\","
                                        "\"crv\":\"P-256\","
                                        "\"alg\":\"ES256\","
                                        "\"x\":\"MKBCTNIcKUSDii11ySs3526iDZ8AiTo7Tu6KPAqv7D4\","
                                        "\"y\":\"4Etl6SRW2YiLUrN5vfvVHuhp7x8PxltmWWlbbM4IFyM\","
                                        "\"kid\":\"1\","
                                        "\"use\":\"sig\""
                                      "}";

  unsigned char output[2048];
  size_t output_len = 2048;
  jwk_t * jwk = NULL;
  jwt_t * jwt = NULL;
  char * claims;

  if ((jwk = r_jwk_quick_import(R_IMPORT_JSON_STR, jwk_pubkey_ecdsa_str)) != NULL && (jwt = r_jwt_quick_parse(token, R_PARSE_NONE, 0)) != NULL) {
    if (r_jwk_export_to_pem_der(jwk, R_FORMAT_PEM, output, &output_len, 0) == RHN_OK) {
      printf("Exported key:\n%.*s\n", (int)output_len, output);
      if (r_jwt_verify_signature(jwt, jwk, 0) == RHN_OK) {
        claims = r_jwt_get_full_claims_str(jwt);
        printf("Verified payload:\n%s\n", claims);
        r_free(claims);
      } else {
        fprintf(stderr, "Error r_jwt_verify_signature\n");
      }
    } else {
      fprintf(stderr, "Error r_jwk_export_to_pem_der\n");
    }
  } else {
    fprintf(stderr, "Error parsing\n");
  }
  r_jwk_free(jwk);
  r_jwt_free(jwt);

  return 0;
}

Examples

Some example programs are available in the examples directory.

Installation

Rhonabwy is available in the following distributions.

Dependencies

Rhonabwy is based on Nettle, GnuTLS, Jansson, zlib, libcurl and libsystemd (if possible), you must install those libraries first before building Rhonabwy.

You also need check and Ulfius to run the tests.

Prerequisites

You need Orcania and Yder.

Those libraries are included in the package rhonabwy-dev-full_{x.x.x}_{OS}_{ARCH}.tar.gz in the Latest release page. If you're building with CMake, they will be automatically downloaded and installed if missing.

Manual install

CMake - Multi architecture

CMake minimum 3.5 is required.

Last Rhonabwy release: https://github.com/babelouest/rhonabwy/releases/latest/

Run the CMake script in a sub-directory, example:

$ cd <rhonabwy_source>
$ mkdir build
$ cd build
$ cmake ..
$ make && sudo make install

The available options for CMake are:

• -DWITH_JOURNALD=[on|off] (default on): Build with journald (SystemD) support
• -BUILD_RHONABWY_TESTING=[on|off] (default off): Build unit tests
• -DINSTALL_HEADER=[on|off] (default on): Install header file rhonabwy.h
• -DBUILD_RPM=[on|off] (default off): Build RPM package when running make package
• -DCMAKE_BUILD_TYPE=[Debug|Release] (default Release): Compile with debugging symbols or not
• -DBUILD_STATIC=[on|off] (default off): Compile static library
• -DBUILD_RHONABWY_DOCUMENTATION=[on|off] (default off): Build documentation with doxygen
• -DWITH_CURL=[on|off] (default on): Use libcurl to download remote content

Good ol' Makefile

Download Rhonabwy from GitHub repository, compile and install.

Last Rhonabwy release: https://github.com/babelouest/rhonabwy/releases/latest/

$ cd rhonabwy/src
$ make
$ sudo make install

To disable curl library on build (to avoid its dependencies), you can pass the option DISABLE_CURL=1 to the make command.

$ cd rhonabwy/src
$ make DISABLE_CURL=1
$ sudo make install

By default, the shared library and the header file will be installed in the /usr/local location. To change this setting, you can modify the DESTDIR value in the src/Makefile.

Example: install Rhonabwy in /tmp/lib directory

$ cd src
$ make && make DESTDIR=/tmp install

You can install Rhonabwy without root permission if your user has write access to $(DESTDIR). A ldconfig command is executed at the end of the install, it will probably fail if you don't have root permission, but this is harmless. If you choose to install Rhonabwy in another directory, you must set your environment variable LD_LIBRARY_PATH properly.