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RSACryptor.cpp
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RSACryptor.cpp
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/**
* Copyright (c) 2018 TectroLabs L.L.C.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the Software
* is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* @file RSACryptor.cpp
* @author Andrian Belinski
* @date 06/1/2018
* @version 1.0
*
* @brief utilizes RSA provider for encryption/decryption with private and public keys
*
*/
#include "RSACryptor.h"
namespace entropyservice {
void RSACryptor::initialize() {
rsa = NULL;
bignum = NULL;
padding = RSA_PKCS1_PADDING;
initializedKey = false;
}
/**
*
* Construct using key file
*
* @param keyFileName a pointer to a file with either private or public
* @param isPublic true if key is public, false if the key is private
*
*/
RSACryptor::RSACryptor(const char *keyFileName, bool isPublic) {
initialize();
if (keyFileName == NULL) {
return;
}
FILE *fp = NULL;
if (isPublic) {
fp = fopen(keyFileName, "r");
if (fp != NULL) {
if (PEM_read_RSAPublicKey(fp, &rsa, NULL, NULL) == NULL) {
fclose(fp);
return;
} else {
fclose(fp);
initializedKey = true;
return;
}
}
}
fp = fopen(keyFileName, "r");
if (fp != NULL) {
if (PEM_read_RSAPrivateKey(fp, &rsa, NULL, NULL) == NULL) {
fclose(fp);
return;
}
fclose(fp);
initializedKey = true;
return;
}
}
/**
* Encrypt bytes with RSA using public key
*
* @param toEncrypt bytes to encrypt
* @param toEncryptSizeBytes number of bytes to encrypt
* @param encrypted encrypted bytes
* @param encryptedSizeBytes a pointer to store the number of encrypted bytes
*
* @return true if encryption was successful
*/
bool RSACryptor::encryptWithPublicKey(unsigned char *toEncrypt, int toEncryptSizeBytes, unsigned char *encrypted, int *encryptedSizeBytes) {
if (!initializedKey || toEncrypt == NULL || encrypted == NULL) {
return false;
}
int result = RSA_public_encrypt(toEncryptSizeBytes, (unsigned char*)toEncrypt, encrypted, rsa, padding);
if (result == -1) {
return false;
}
*encryptedSizeBytes = result;
return true;
}
/**
* Encrypt bytes with RSA using private key
*
* @param toEncrypt bytes to encrypt
* @param toEncryptSizeBytes number of bytes to encrypt
* @param encrypted encrypted bytes
* @param encryptedSizeBytes a pointer to store the number of encrypted bytes
*
* @return true if encryption was successful
*/
bool RSACryptor::encryptWithPrivateKey(unsigned char *toEncrypt, int toEncryptSizeBytes, unsigned char *encrypted, int *encryptedSizeBytes) {
if (!initializedKey || toEncrypt == NULL || encrypted == NULL) {
return false;
}
int result = RSA_private_encrypt(toEncryptSizeBytes, toEncrypt, encrypted, rsa, padding);
if (result == -1) {
return false;
}
*encryptedSizeBytes = result;
return true;
}
/**
* Decrypt bytes with RSA using private key
*
* @param toDecrypt bytes to decrypt
* @param toDecryptSizeBytes number of bytes to decrypt
* @param decrypted decrypted bytes
* @param decryptedSizeBytes a pointer to store the number of decrypted bytes
*
* @return true if decryption was successful
*/
bool RSACryptor::decryptWithPrivateKey(unsigned char *toDecrypt, int toDecryptSizeBytes, unsigned char *decrypted, int *decryptedSizeBytes) {
if (!initializedKey || toDecrypt == NULL || decrypted == NULL) {
return false;
}
int result = RSA_private_decrypt(toDecryptSizeBytes, toDecrypt, decrypted, rsa, padding);
if (result == -1) {
return false;
}
*decryptedSizeBytes = result;
return true;
}
/**
* Decrypt bytes with RSA using public key
*
* @param toDecrypt bytes to decrypt
* @param toDecryptSizeBytes number of bytes to decrypt
* @param decrypted decrypted bytes
* @param decryptedSizeBytes a pointer to store the number of decrypted bytes
*
* @return true if decryption was successful
*/
bool RSACryptor::decryptWithPublicKey(unsigned char *toDecrypt, int toDecryptSizeBytes, unsigned char *decrypted, int *decryptedSizeBytes) {
if (!initializedKey || toDecrypt == NULL || decrypted == NULL) {
return false;
}
int result = RSA_public_decrypt(toDecryptSizeBytes, toDecrypt, decrypted, rsa, padding);
if (result == -1) {
return false;
}
*decryptedSizeBytes = result;
return true;
}
/**
*
* Construct using a new key
*
* @param keySize RSA key size
*
*/
RSACryptor::RSACryptor(int keySize) {
initialize();
creteNewKey(keySize);
}
/**
*
* Construct using a new RSA key
*
*/
RSACryptor::RSACryptor() {
initialize();
creteNewKey(2048);
}
/**
* Export private key to a file
*
* @param fileName location of the file to store the private key
*
* @return true if export was successful
*/
bool RSACryptor::exportPrivateKeyToFile(const char *fileName) {
if (!initializedKey || fileName == NULL) {
return false;
}
BIO *bp = BIO_new_file(fileName, "w+");
if (PEM_write_bio_RSAPrivateKey(bp, rsa, NULL, NULL, 0, NULL, NULL) != 1) {
BIO_free_all(bp);
return false;
}
BIO_free_all(bp);
return true;
}
/**
* Export public key to a file
*
* @param fileName location of the file to store the public key
*
* @return true if export was successful
*/
bool RSACryptor::exportPublicKeyToFile(const char *fileName) {
if (!initializedKey || fileName == NULL) {
return false;
}
BIO *bp = BIO_new_file(fileName, "w+");
if (PEM_write_bio_RSAPublicKey(bp, rsa) != 1) {
BIO_free_all(bp);
return false;
}
BIO_free_all(bp);
return true;
}
/**
*
* Create a new key pair
*
* @param keySize RSA key size
*
*/
void RSACryptor::creteNewKey(int keySize) {
initializedKey = false;
unsigned long e = RSA_F4;
bignum = BN_new();
if (BN_set_word(bignum, e) != 1) {
return;
}
rsa = RSA_new();
if (RSA_generate_key_ex(rsa, keySize, bignum, NULL) != 1) {
return;
}
initializedKey = true;
}
/**
*
* Check to see if the instance is initialized
*
* @return true if initialized
*
*/
bool RSACryptor::isInitialized() {
return initializedKey;
}
/**
* De-allocate resources.
*/
RSACryptor::~RSACryptor() {
if (rsa) {
RSA_free(rsa);
}
if (bignum) {
BN_free(bignum);
}
}
} /* namespace entropyservice */