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/* rsa.js
*
* Copyright (C) 2006-2024 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
const wolfcrypt = require( '../build/Release/wolfcrypt' );
class WolfSSLRsa
{
/**
* Creates a new RsaKey by calling sizeof_RsaKey and wc_InitRsaKey
*
* @remarks free must be called to free the rsa key data
*/
constructor()
{
this.rsa = Buffer.alloc( wolfcrypt.sizeof_RsaKey() )
wolfcrypt.wc_InitRsaKey( this.rsa )
}
/**
* Makes a new rsa key and fills the rsa struct with the key data
*
* @param size The size of the rsa key.
*
* @param e The exponent parameter to use for key generation.
*
* @throws {Error} If the rsa key is not allocated.
*
* @throws {Error} If wc_MakeRsaKey fails.
*/
MakeRsaKey( size, e )
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
let ret = wolfcrypt.wc_MakeRsaKey( this.rsa, size, e )
if ( ret != 0 )
{
throw `Failed to wc_MakeRsaKey ${ ret }`
}
}
/**
* Makes a new rsa key and fills the rsa struct with the key data, uses callback
*
* @param size The size of the rsa key.
*
* @param e The exponent parameter to use for key generation.
*
* @param cb The callback function that will be called upon error or the key completion.
*
* @throws {Error} If the rsa key is not allocated.
*/
MakeRsaKey_cb( size, e, cb )
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
wolfcrypt.wc_MakeRsaKey_async( this.rsa, size, e, cb )
}
/**
* Makes a new rsa key and fills the rsa struct with the key data, uses promise
*
* @param size The size of the rsa key.
*
* @param e The exponent parameter to use for key generation.
*
* @returns A promise that will resolve when the key is finished or reject when it fails.
*
* @throws {Error} If the rsa key is not allocated.
*/
MakeRsaKey_promise( size, e )
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
return new Promise( ( res, rej ) => {
wolfcrypt.wc_MakeRsaKey_async( this.rsa, size, e, ( err, ret ) => {
if ( err )
{
return rej( err )
}
if ( ret != 0 )
{
return rej( ret )
}
res()
} )
} );
}
/**
* Exports the private key in Der format
*
* @returns The Der private key as a data Buffer.
*
* @throws {Error} If the rsa key is not allocated.
*
* @throws {Error} If wc_RsaKeyToDer fails.
*/
KeyToDer()
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
let derBuf = Buffer.alloc( wolfcrypt.RsaPrivateDerSize( this.rsa ) )
let ret = wolfcrypt.wc_RsaKeyToDer( this.rsa, derBuf, derBuf.length )
if ( ret <= 0 )
{
throw `Failed to wc_RsaKeyToDer ${ ret }`
}
return derBuf
}
/**
* Exports the public key in Der format
*
* @returns The Der public key as a data Buffer.
*
* @throws {Error} If the rsa key is not allocated.
*
* @throws {Error} If wc_RsaKeyToPublicDer fails.
*/
KeyToPublicDer()
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
let derBuf = Buffer.alloc( wolfcrypt.RsaPublicDerSize( this.rsa ) )
let ret = wolfcrypt.wc_RsaKeyToPublicDer( this.rsa, derBuf, derBuf.length )
if ( ret < 0 )
{
throw `Failed to wc_RsaKeyToPublicDer ${ ret }`
}
return derBuf
}
/**
* Imports the private key from Der Buffer
*
* @param derBuf The private key Der.
*
* @throws {Error} If the rsa key is not allocated.
*
* @throws {Error} If derBuf is not a Buffer.
*
* @throws {Error} If wc_RsaPrivateKeyDecode fails.
*/
PrivateKeyDecode( derBuf )
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
if ( !Buffer.isBuffer( derBuf ) )
{
throw 'Private key der must be Buffer'
}
let ret = wolfcrypt.wc_RsaPrivateKeyDecode( derBuf, this.rsa, derBuf.length )
if ( ret != 0 )
{
throw `Failed to wc_RsaPrivateKeyDecode ${ ret }`
}
}
/**
* Imports the public key from Der Buffer
*
* @param derBuf The public key Der.
*
* @throws {Error} If the rsa key is not allocated.
*
* @throws {Error} If derBuf is not a Buffer.
*
* @throws {Error} If wc_RsaPublicKeyDecode fails.
*/
PublicKeyDecode( derBuf )
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
if ( !Buffer.isBuffer( derBuf ) )
{
throw 'Public key der must be Buffer'
}
let ret = wolfcrypt.wc_RsaPublicKeyDecode( derBuf, this.rsa, derBuf.length )
if ( ret != 0 )
{
throw `Failed to wc_RsaPublicKeyDecode ${ ret }`
}
}
/**
* Encrypts the provided data using the public key
*
* @param data The data to encrypt.
*
* @returns The encrypted message as a data Buffer.
*
* @throws {Error} If the rsa key is not allocated.
*
* @throws {Error} If data is not a string or Buffer.
*
* @throws {Error} If wc_RsaPublicEncrypt fails.
*/
PublicEncrypt( data )
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
if ( typeof data == 'string' )
{
data = Buffer.from( data )
}
if ( !Buffer.isBuffer( data ) )
{
throw 'Data must be string or Buffer'
}
let ciphertext = Buffer.alloc( wolfcrypt.wc_RsaEncryptSize( this.rsa ) )
let ret = wolfcrypt.wc_RsaPublicEncrypt( data, data.length, ciphertext, ciphertext.length, this.rsa )
if ( ret <= 0 )
{
throw `Failed to wc_RsaPublicEncrypt ${ ret }`
}
ciphertext = ciphertext.subarray( 0, ret )
return ciphertext
}
/**
* Decrypts the provided ciphertext using the private key
*
* @param ciphertext The ciphertext to decrypt.
*
* @returns The plaintext message as a data Buffer.
*
* @throws {Error} If the rsa key is not allocated.
*
* @throws {Error} If ciphertext is not a Buffer.
*
* @throws {Error} If wc_RsaPrivateDecrypt fails.
*/
PrivateDecrypt( ciphertext )
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
if ( !Buffer.isBuffer( ciphertext ) )
{
throw `ciphertext must be a Buffer`
}
let data = Buffer.alloc( wolfcrypt.wc_RsaEncryptSize( this.rsa ) )
let ret = wolfcrypt.wc_RsaPrivateDecrypt( ciphertext, ciphertext.length, data, data.length, this.rsa )
if ( ret <= 0 )
{
throw `Failed to wc_RsaPrivateDecrypt ${ ret }`
}
data = data.subarray( 0, ret )
return data
}
/**
* Generates a signature of the provided data using the private key
*
* @param data The data to sign.
*
* @returns The signature as a data Buffer.
*
* @throws {Error} If the rsa key is not allocated.
*
* @throws {Error} If data is not a string or Buffer.
*
* @throws {Error} If wc_RsaSSL_Sign fails.
*/
SSL_Sign( data )
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
if ( typeof data == 'string' )
{
data = Buffer.from( data )
}
if ( !Buffer.isBuffer( data ) )
{
throw 'data must be a string or Buffer'
}
let sig = Buffer.alloc( wolfcrypt.wc_RsaEncryptSize( this.rsa ) )
let ret = wolfcrypt.wc_RsaSSL_Sign( data, data.length, sig, sig.length, this.rsa )
if ( ret <= 0 )
{
throw `Failed to wc_RsaSSL_Sign ${ ret }`
}
return sig
}
/**
* Verifies a signature of the provided data using the public key
*
* @param sig The signature to verify.
*
* @param data The data used to generate the signature.
*
* @returns true if the signature is valid, false otherwise.
*
* @throws {Error} If the rsa key is not allocated.
*
* @throws {Error} If sig is not a Buffer.
*
* @throws {Error} If data is not a string or Buffer.
*
* @throws {Error} If wc_RsaSSL_Verify fails.
*/
SSL_Verify( sig, data )
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
if ( !Buffer.isBuffer( sig ) )
{
throw `signature must be a Buffer`
}
if ( typeof data == 'string' )
{
data = Buffer.from( data )
}
if ( !Buffer.isBuffer( data ) )
{
throw 'data must be a string or Buffer'
}
let validLength = wolfcrypt.wc_RsaSSL_Verify( sig, sig.length, data, data.length, this.rsa )
if ( validLength < 0 )
{
throw `Failed to wc_RsaSSL_Verify ${ validLength }`
}
if ( validLength == data.length )
{
return true
}
return false
}
/**
* Frees the data allocated by the rsa key
*
* @throws {Error} If rsa key is not allocated.
*
* @throws {Error} If wc_FreeRsaKey fails.
*/
free()
{
if ( this.rsa == null )
{
throw 'Invalid rsa key'
}
let ret = wolfcrypt.wc_FreeRsaKey( this.rsa )
if ( ret != 0 )
{
throw `Failed to wc_FreeRsaKey ${ ret }`
}
this.rsa = null
}
}
exports.WolfSSLRsa = WolfSSLRsa