This Node.js module exposes various wolfCrypt native C functions to Node.js using the Napi library. It makes wolfCrypt functions for ECC, EVP, HMAC, PBKDF2, PKCS7, RSA and SHA available within Nodejs and also provides interface classes that streamline a lot of the tedious actions required when using these functions.
The native C functions can be called by importing wolfCrypt from this package:
const { wolfcrypt } = require( 'wolfcrypt' )
const message = Buffer.from( 'Hello wolfSSL!' )
// allocate the rsa key
let rsaKey = Buffer.alloc( wolfcrypt.sizeof_RsaKey() )
// init the rsa key
let ret = wolfcrypt.wc_InitRsaKey( rsaKey )
// make a new key
if ( ret == 0 )
ret = wolfcrypt.wc_MakeRsaKey( rsaKey, 2048, 65537 )
// sign a message
let signature = Buffer.alloc( wolfcrypt.wc_RsaEncryptSize( rsaKey ) )
if ( ret == 0 )
ret = wolfcrypt.wc_RsaSSL_Sign( message, message.length, signature, signature.length, rsaKey )
// check the signature
if ( ret == signature.length )
ret = wolfcrypt.wc_RsaSSL_Verify( signature, signature.length, message, message.length, rsaKey )
console.log( ret == message.length )
// free the struct data
ret = wolfcrypt.wc_FreeRsaKey( rsaKey )
ret will be the return value of the C function. It is important to note that wolfcrypt structures are not managed by the garbage collector and as in the above example the relevant function call must be made to free the memory used by wolfCrypt, in this case wc_FreeRsaKey. All of the available C functions can be found in addon/wolfcrypt/main.cpp.
Alternatively if you find using the native C functions within Node.js to be clunky, interface Classes have been provided to make using wolfCrypt more convenient in Node.js:
const { WolfSSLRsa } = require( 'wolfcrypt' )
const message = 'Hello wolfSSL!'
let rsa = new WolfSSLRsa()
try
{
// make a new key
rsa.MakeRsaKey( 2048, 65537 )
// sign a message
const signature = rsa.SSL_Sign( message )
// check the signature
let valid = rsa.SSL_Verify( signature, message )
console.log( valid )
// free the struct data
rsa.free()
}
catch ( e )
{
console.log( e )
}
Instead of needing to check the return value of the C functions, the class will do that for you and throw an error with the wolfSSL error code if anything fails. The free function must still be called to cleanup the internal structure data. The interface classes and their methods can be found in the interfaces folder.
The EVP and HMAC interfaces include stream classes that allow them to process data from stream buffers, which is convenient when working with files or http streams:
const fs = require( 'fs' )
const { WolfSSLHmacStream } = require( 'wolfcrypt' )
let parts = []
const key = Buffer.from( '12345678901234567890123456789012' )
// create a read stream from the file message.txt
let readStream = fs.createReadStream( 'message.txt' )
let hmacStream = new WolfSSLHmacStream( 'SHA3_512', key )
// collect all the data that come from the hmac stream
hmacStream.on( 'data', function( chunk ) {
parts.push( chunk )
} )
// called when the end of file has been hashed
hmacStream.on( 'end', function() {
const fileDigest = Buffer.concat( parts ).toString( 'hex' )
console.log( fileDigest )
} )
// send the output of the file stream to the hmacStream
readStream.pipe( hmacStream )
In the above example we take the contents of message.txt and compute the hmac using the provided key and SHA3_512 as the hashing algorithm.
The RSA and ECC key make functions support async workers and can be called using either a promise or a callback function:
const { WolfSSLEcc } = require( 'wolfcrypt' );
( async () => {
let ecc0 = new WolfSSLEcc()
let ecc1 = new WolfSSLEcc()
// make both keys concurrently
await Promise.all([ ecc0.make_key_promise( 64 ), ecc1.make_key_promise( 64 ) ])
const secret_0 = ecc0.shared_secret( ecc1 ).toString( 'hex' )
const secret_1 = ecc1.shared_secret( ecc0 ).toString( 'hex' )
ecc0.free()
ecc1.free()
console.log( secret_0 == secret_1 )
} )()
This example uses the make_key_promise to make both keys concurrently, but requires promises. The same example using callbacks would look like:
const { WolfSSLEcc } = require( 'wolfcrypt' );
let ecc0 = new WolfSSLEcc()
let ecc1 = new WolfSSLEcc()
let readyKeys = 0;
const cb = ( err, ret ) => {
if ( err || ret != 0 )
{
console.log( 'Failed to make key' )
}
else
{
readyKeys++;
if ( readyKeys == 2 )
{
const secret_0 = ecc0.shared_secret( ecc1 ).toString( 'hex' )
const secret_1 = ecc1.shared_secret( ecc0 ).toString( 'hex' )
ecc0.free()
ecc1.free()
console.log( secret_0 == secret_1 )
}
}
}
// make both keys concurrently
ecc0.make_key_cb( 64, cb )
ecc1.make_key_cb( 64, cb )
More examples of how to use the functions in this library can be found in the tests directory
WolfSSL must be installed on your machine, this package dynamically links it
./configure --enable-all
make
sudo make install
To link wolfCrypt you need to run export LD_LIBRARY_PATH=/usr/local/lib or wherever you have your wolfssl installed:
Verify the .so (shared object) path and version in binding.gyp:
'libraries': [
"/usr/local/lib/libwolfssl.so"
],
npm i wolfcrypt
Then to import it in your application code
const { wolfcrypt, WolfSSLEncryptionStream } = require( 'wolfcrypt' )
...
git clone https://github.com/wolfSSL/wolfcrypt_nodejs
cd wolfcrypt_nodejs
npm i
Then copy the directory into your project's node_modules folder
cp -R wolfcrypt_nodejs my_project/node_modules
And import it using the folder name
const { wolfcrypt, WolfSSLEncryptionStream } = require( 'wolfcrypt_nodejs' )
...
Use the local ./lib/user_settings.h; Copy it to your <WOLFSSL_ROOT>/IDE/Win directory (or wherever your wolfssl binaries will be).
See the wolfssl-VS2022.vcxproj Project File in the root of your wolfSSL source.
The setup_env.ps1 or setup_env.bat script can be used to setup the NodeJS/NPM environment.
The Windows Visual Studio environment assumes that wolfSSL source code repository is available. If not:
From DOS:
cd C:\workspace
:: Fetch this repo from your fork:
git clone https://github.com/%USERNAME%/wolfcrypt_nodejs.git
:: Fetch wolfssl from your fork:
git clone https://github.com/%USERNAME%/wolfssl.git "wolfssl-%USERNAME%"
cd "wolfssl-%USERNAME%"
git remote add upstream https://github.com/wolfSSL/wolfssl.git
From Powershell:
cd C:\workspace
$USERNAME = $env:USERNAME
# Fetch this repo from your fork:
git clone https://github.com/$USERNAME/wolfcrypt_nodejs.git
# Fetch wolfssl from your fork:
git clone "https://github.com/$USERNAME/wolfssl.git" "wolfssl-$USERNAME"
cd "wolfssl-$USERNAME"
git remote add upstream https://github.com/wolfSSL/wolfssl.gitScript preference will be given first for the directory name wolfssl-<username>, then wolfssl
For the binding.gyp:
WOLFSSL_LIB_PATHlocation of the wolfSSL compiled lib file, default:C:/workspace/wolfssl/DLL Release/x64WOLFSSL_INCLUDE_PATHlocation of wolfssl include directory, default:C:/workspace/wolfsslWOLFSSL_USER_SETTINGS_PATHlocation of wolfssluser_settings.hdefault:C:/workspace/wolfssl/IDE/WIN
Important: Ensure the same user_settings.h used to compile wolfSSL is referenced from this NodeJS module!
DOS
set WOLFSSL_LIB_PATH=C:/workspace/wolfssl-%USERNAME%/DLL Release/x64
set WOLFSSL_INCLUDE_PATH=C:/workspace/wolfssl-%USERNAME%
set WOLFSSL_USER_SETTINGS_PATH=C:/workspace/wolfssl-%USERNAME%/IDE/WIN
set PATH=%PATH%;%WOLFSSL_LIB_PATH%
PowerShell
$env:WOLFSSL_LIB_PATH = "C:/workspace/wolfssl-$env:USERNAME/DLL Release/x64"
$env:WOLFSSL_INCLUDE_PATH = "C:/workspace/wolfssl-$env:USERNAME"
$env:WOLFSSL_USER_SETTINGS_PATH = "C:/workspace/wolfssl-$env:USERNAME/IDE/WIN"
$env:PATH += ";$env:WOLFSSL_LIB_PATH"See:
winget install Schniz.fnmEnsure the architecture compiled in Visual Studio matches that in node: see node -p "process.arch"
fnm env --use-on-cd | Out-String | Invoke-Expression
fnm use --install-if-missing 20
node -v # should print `v20.18.0`
npx -v # should print `10.8.2`
# Launch VS2022 from the same shell:
& "C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\devenv.exe"Use the IDE/WIN10/user_settings.h file and ensure these items are defined:
/* npm */
#define NPM_WOLFCRYPT
#ifdef NPM_WOLFCRYPT
#undef HAVE_PKCS7
#define HAVE_PKCS7
#define HAVE_AES_KEYWRAP
#define WOLFSSL_AES_DIRECT
#define HAVE_X963_KDF
#define WOLFSSL_SHA224
#define WOLFSSL_KEY_GEN
#define HAVE_ECC
#define ECC_MAX_BITS 521
#define WC_ECC256
#define WC_ECC384
#define WC_ECC521
#define HAVE_ECC_ENCRYPT
#define WOLFSSL_UINT128_T_DEFINED
/* #define WC_RNG_SEED_CB */
#endifThere's also a reference file included in the ./lib directory here.
See wolfssl PR #8090 that adds Visual Studio 2022 project files.
Build wolfssl using Visual Studio and see the resulting files as noted in output:
1> Creating library C:\workspace\wolfssl-gojimmypi-win\DLL Release\x64\wolfssl-VS2022.lib and object C:\workspace\wolfssl-gojimmypi-win\DLL Release\x64\wolfssl-VS2022.exp
1>Generating code
1>0 of 3869 functions ( 0.0%) were compiled, the rest were copied from previous compilation.
1> 0 functions were new in current compilation
1> 0 functions had inline decision re-evaluated but remain unchanged
1>Finished generating code
1>wolfssl-VS2022.vcxproj -> C:\workspace\wolfssl-gojimmypi-win\DLL Release\x64\wolfssl-VS2022.dll
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
========== Build completed at 3:32 PM and took 12.825 seconds ==========
In the above case, using the root level project wolfssl-VS2022.vcxproj,
select "DLL Release" build option; upon building the output binaries files should be found in
C:\workspace\wolfssl-%USERNAME%\DLL Release\x64\wolfssl-VS2022.lib.
It is best to convert the Windows \ to /.
If instead conpiled with the wolfcrypt/test app, the lib file will be in:
C:/workspace/wolfssl-%USERNAME%/wolfcrypt/test/DLL Release/x64/wolfssl-VS2022.lib
if this error C2065: 'TI': undeclared identifier is encountered, ensure the user_settings.h mentioned above is used,
in particular the #define WOLFSSL_UINT128_T_DEFINED.
nothing.vcxproj -> C:\workspace\wolfcrypt_nodejs-gojimmypi\build\Release\\nothing.lib
main.cpp
C:\workspace\wolfssl-gojimmypi-win\wolfssl\wolfcrypt\sp_int.h(257,44): error C2146: syntax error: missing ';' before identifier '__attribute__' [C:\workspace\wolfcrypt_
nodejs-gojimmypi\build\wolfcrypt.vcxproj]
(compiling source file '../addon/wolfcrypt/main.cpp')
C:\workspace\wolfssl-gojimmypi-win\wolfssl\wolfcrypt\sp_int.h(257,65): error C2065: 'TI': undeclared identifier [C:\workspace\wolfcrypt_nodejs-gojimmypi\build\wolfcrypt
.vcxproj]
(compiling source file '../addon/wolfcrypt/main.cpp')
If this error is observed (missing wolfssl/options.h), see wolfSSL install.
Determine if the WOLFSSL_USER_SETTINGS preprocessor directive has been defined.
gyp info spawn args ]
nothing.c
win_delay_load_hook.cc
nothing.vcxproj -> C:\workspace\wolfcrypt_nodejs-gojimmypi\build\Release\\nothing.lib
main.cpp
C:\workspace\wolfcrypt_nodejs-gojimmypi\addon\wolfcrypt\h\evp.h(25,10): error C1083: Cannot open include file: 'wolfssl/options.h': No such file or directory [C
:\workspace\wolfcrypt_nodejs-gojimmypi\build\wolfcrypt.vcxproj]
(compiling source file '../addon/wolfcrypt/main.cpp')
gyp ERR! build error
gyp ERR! stack Error: `C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\MSBuild.exe` failed with exit code: 1
gyp
If this Error: The specified module could not be found. is observed:
C:\workspace\wolfcrypt_nodejs-gojimmypi>npm run test
> wolfcrypt@1.0.3 test
> node test.js
node:internal/modules/cjs/loader:1586
return process.dlopen(module, path.toNamespacedPath(filename));
^
Error: The specified module could not be found.
\\?\C:\workspace\wolfcrypt_nodejs-gojimmypi\build\Release\wolfcrypt.node
at Module._extensions..node (node:internal/modules/cjs/loader:1586:18)
at Module.load (node:internal/modules/cjs/loader:1288:32)
at Module._load (node:internal/modules/cjs/loader:1104:12)
at Module.require (node:internal/modules/cjs/loader:1311:19)
at require (node:internal/modules/helpers:179:18)
at Object.<anonymous> (C:\workspace\wolfcrypt_nodejs-gojimmypi\interfaces\ecc.js:21:19)
at Module._compile (node:internal/modules/cjs/loader:1469:14)
at Module._extensions..js (node:internal/modules/cjs/loader:1548:10)
at Module.load (node:internal/modules/cjs/loader:1288:32)
at Module._load (node:internal/modules/cjs/loader:1104:12) {
code: 'ERR_DLOPEN_FAILED'
}
Node.js v20.18.0
Ensure the DLL can be found, either copied locally or in the DOS path:
:: set your location of the wolfSSL root directory:
set WOLFSSL_ROOT=C:\workspace\wolfssl-%USERNAME%
:: if using the DLL Release from an example, such as the wolfcrypt test:
set PATH=%PATH%;%WOLFSSL_ROOT%\wolfcrypt\test\DLL Release\x64\
:: otherwise set to root-level project; Be sure DLL Release was successfuly built and the file exists:
set PATH=%PATH%;%WOLFSSL_ROOT%\DLL Release\x64\
Or when using PowerShell:
# set WOLFSSL_ROOT to c:\workspace\wolfssl-[your login name]
$env:WOLFSSL_ROOT = "C:\workspace\wolfssl-$env:USERNAME"
$env:PATH += ";$env:WOLFSSL_ROOT\DLL Release\x64"
# Check the current path
$env:PATH -split ";"When encountering cannot open input file... wolfssl[-VS2022].lib like this:
LINK : fatal error LNK1181: cannot open input file 'C:\workspace\wolfssl\DLL Released\wolfssl-VS2022.lib' [C:\workspace\wolfcrypt_nodejs\build\wolfcrypt.vcxproj]
Ensure the DLL Release build was selected and that the [wolfssl root]\DLL Release\x64\wolfssl-VS2022.lib file exists; build with the wolfSSL project and confirm build was successful:
1>Finished generating code
1>wolfssl-VS2022.vcxproj -> C:\workspace\wolfssl\DLL Release\x64\wolfssl-VS2022.dll
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========
========== Rebuild completed at 6:08 PM and took 17.377 seconds ==========
For the error: LINK : fatal error LNK1181: cannot open input file '<your path>\DLL Release\x64\wolfssl.lib' like this:
win_delay_load_hook.cc
LINK : fatal error LNK1181: cannot open input file 'C:\workspace\wolfssl-gojimmypi\DLL Release\x64\wolfssl.lib' [C:\workspace\wolfcrypt_nodejs-gojimmypi\build\wolfcrypt.vcxproj]
gyp ERR! build error
gyp ERR! stack Error: `C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\MSBuild.exe` failed with exit code: 1
gyp ERR! stack at ChildProcess.onExit (C:\workspace\wolfcrypt_nodejs-gojimmypi\node_modules\node-gyp\lib\build.js:203:23)
gyp ERR! stack at ChildProcess.emit (node:events:519:28)
gyp ERR! stack at ChildProcess._handle.onexit (node:internal/child_process:294:12)
Ensure wolfSSL has been build with the DLL Release build option and that the files exist in <your path>\DLL Release\x64\.
Also ensure the binding.gyp file uses forward slashes, (or double backslashes). Not just a single backslash.
['OS=="win"', {
"libraries": [
"C:/workspace/wolfssl-gojimmypi-win/DLL Release/x64/wolfssl-VS2022.lib",
Note that the options.h definition should match those from the compiled lib file that used the respective
Windows user_settings.h.
Clean build:
npm run clean
node-gyp clean
node-gyp rebuildSee the my_test.ps1 script that also includes:
npm i
npm run test
Run it like this:
powershell -ExecutionPolicy Bypass -File .\my_test.ps1
$ npm run test
PASS ecc makeKey
PASS ecc sharedSecret32
PASS ecc sharedSecret64
PASS ecc signVerify
PASS ecc importExportx963
PASS ecc importExportDer
PASS evp encrypt
PASS evp decrypt
PASS evp encrypt_decrypt_odd
PASS evp encryptionStream
PASS evp decryptionStream
PASS evp encryptDecryptPipes
PASS hmac hmac
PASS hmac hmacStream
PASS hmac hmacPipe
PASS pbkdf2
PASS pkcs7 addCertificate
PASS pkcs7 encodeData
PASS pkcs7 signVerify
PASS pkcs7 getAttribute
PASS pkcs7 getSid
PASS rsa keyToDer
PASS rsa keyToPublicDer
PASS rsa privateKeyDecode
PASS rsa publicKeyDecode
PASS rsa encryptDecrypt
PASS rsa signVerify
PASS sha sha
PASS sha sha224
PASS sha sha256
PASS sha sha384
PASS sha sha512
PASS sha sha512_224
PASS sha sha512_256