All Questions
Tagged with cryptography c++
698 questions
-1
votes
0
answers
43
views
How do I convert HOTP counter value to unsigned char*?
I am now facing issues implementing HOTP using HMAC-SHA1. I am not sure how do I convert the "Counter" from int to unsigned char* for HMAC hashing.
I call hmac_6_digit_totp() as below
...
- 9
1
vote
0
answers
75
views
HMAC-SHA256 hash using OpenSSL does not match hash from online tools
I am trying to use OpenSSL 3.4.0 to generate an HMAC hash EVP_sha256. However, I am not able to match my generated hash to online tools (tried: base32 encoded key for each side).
Here is my source ...
- 9
1
vote
0
answers
103
views
signature verification issue with crypt32.dll CryptMsgControl api
We have an application which transfer EDI documents using AS2 protocol where When we send data to one of our business partner and try to verify the signature of the MDN that business partner return to ...
- 155
0
votes
1
answer
74
views
Verifying signed message with Qt's QCA::SecureMessage
I want to write a Qt application that reads a signed message and verifies its signature through QCA::SecureMessage. Using QCA's examples page and reading their unit tests from the publicly available ...
5
votes
1
answer
137
views
How to decrypt C++ OpenSSL ChaCha20 from nodeJS?
I'm trying to decrypt data that have been encrypted using C++ OpenSSL ChaCha20 from Node.js, but standard Node.js crypto module doesn't directly support ChaCha20 without Poly1305.
I have tried using ...
- 79
2
votes
0
answers
69
views
Loading OpenSSH public private keys into CryptoPP
I want to load openssh public key and private key using CryptoPP lib, the code is as follows:
#include <cryptopp/files.h>
#include <cryptopp/rsa.h>
#include <exception>
int main(int ...
- 31
1
vote
1
answer
71
views
Aes-256-GCM OpenSSL > nodeJS
I'm trying to decrypt data that have been encrypted using C++/OpenSSL Aes-256-GCM from nodejs javascript.
C++ encryption implementation:
#include <string>
#include <sstream>
#include <...
- 32
0
votes
2
answers
145
views
Converting double type to binary in C++
I have a task to test various pseudo random number generators in C++, using NIST-800-22. NIST test suite requires me to convert generated numbers and store them in binary format, for integers it wasnt ...
1
vote
0
answers
100
views
Understand OpenSSL's AES-256-CBC encrypt/decrypt - IV issue
There's openssl code that I try to understand why it is working.
See this code below.
It has encryption and decryption functions over OpenSSL's AES-256-CBC cipher.
It also contains simple main() ...
- 11
0
votes
0
answers
49
views
Issue with Mismatched Tweaked Public Keys in Ed25519 Using Libsodium in C++
I'm working on a cryptographic project using the Ed25519 curve and Libsodium in C++. My goal is to tweak an initial key pair by adding a derived scalar to the initial seed and then generate the ...
- 1
3
votes
0
answers
55
views
Make OpenSSL use pointers from input buffer for holding cms structure instead of allocating memory
An embedded device with limited memory is already using OpenSSL for communication.
I am implementing a CMS signature verification wrapper library using OpenSSL that should work for the device.
We ...
- 33
0
votes
1
answer
275
views
Import Private Key to Microsoft TPM Virtual Smart Card without popups for card selection and PIN
I am trying to import private key to Microsoft TPM Virtual Smart Card.
With legacy crypto API, private key is imported successfully. verified with certutil -scinfo. Problem with this approach is, it ...
- 91
1
vote
1
answer
721
views
Getting "Signature for this request is not valid." in Binance websocket api while using ed25519 keys in C++
Hi I'm trying to send orders to Binance websocket api wss://ws-api.binance.com:443/ws-api/v3. I'm using ed25519 keys to sign my order json data. When i'm sending the request i'm getting:
{"id&...
-1
votes
1
answer
71
views
Encountered this error while implementing NTT cpp code: terminate called after throwing an instance of 'std::bad_alloc' what(): std::bad_alloc
I recently started implementing post-quantum crypto and needed to implement the polynomial multiplication for which number theoretic transform (ntt) is used to reduce its time of computation and this ...
- 11
0
votes
0
answers
154
views
Add Botan library to CLion C++ project
I have been trying to add the Botan library to my C++ project but I haven't figured it out yet. I am on Ubuntu 22.04 using CLion with CMake.
I downloaded the latest (3.3.0) release from GitHub and ...
1
vote
0
answers
245
views
Lua 5.1 bitwise operations using arithmetic for 64bit numbers
Lua 5.1 does not yet support bitwise operators. The Lua environment I'm using is restricted and provides a bit32 library that allows bitwise operations with 32-bit numbers.
The issue is that I'm ...
- 19
0
votes
1
answer
173
views
Can not read private key from a string rather than a file in crypto++
I need to use an openssl generated key to sign messages via cryptopp lib.
The key generated with:
openssl genrsa -out privatKey.pem 2048
and to get rid of the error CryptoPP::BERDecodeErr when loading ...
- 583
0
votes
0
answers
71
views
Crypto++ text file Decryption not working properly
I am trying to decrypt an encrypted file Using the Crypto++ Library. The encryption seems to work perfectly as the file that I am encrypting has Cipher text when I open it. However , just in case I ...
0
votes
1
answer
103
views
How do I replicate PHP's hash_hmac function in C++?
I'm trying to replicate PHP's hash_hmac function in C++ using wincrypt. Someone sent me this MS link
titled "Example C Program: Creating an HMAC". I copy all of the code and the result ...
- 1,653
-2
votes
1
answer
94
views
Demonstrating that double Affine encryption offers no additional security compared to single encryption
I'm currently taking an online Cryptography course, and one of the assignments is to demonstrate that encrypting data multiple times with the Affine cipher does not actually enhance its security. I've ...
- 11
0
votes
0
answers
342
views
Error during decryption using Openssl EVP_DecryptFinal_ex
I have simple implementation of AES GCM, with encryption and decryption functions. During testing I obtained an error during decryption. In particular, after the encryption that seems correct, I have ...
0
votes
0
answers
226
views
How to decrypt with password/salt an encrypted string with c++ openssl on nodejs
Im trying to decrypt an encrypted string with password/salt using c++/openssl.
In my attempt below the generated key on js matches the key generated from the c++ function, but the iv's doesnt.
Its ...
- 134
0
votes
0
answers
132
views
How to decrypt using a passphrase and salt using the crypto++ lib?
I'm trying to decrypt a string that has been encrypted using openssl, evp_aes_128_cbc, and a password/salt
I have succeeded decrypting it using openssl, but not using the crypto++ lib.
The key ...
- 134
1
vote
0
answers
233
views
How to calculate file hash with crypto++
I'm trying to convert this qt hash function to "c++ only" and using the crypto++ lib
QString calculateGitHubFileHash(const QString& filePath)
{
QFile file(filePath);
QString ...
- 134
0
votes
0
answers
152
views
invalid PKCS #7 block padding found in file decryption
I am working on a project that includes encrypting and decrypting files, I process the file and then I encrypt it and save it on a new file with a custom file extension, the file includes the ...
- 1
0
votes
1
answer
82
views
Getting Error While Decryption An AES Encrypted String In Cpp
When I decrypt a string with the decryption function I got some redundant characters. Actually, this code is written for encrypting and decrypting raw bytes.
Here is my code.
Python AES Encryption ...
-1
votes
1
answer
53
views
How to get matching Z from Tpm2.EcdhZGen() and NCrypt.DeriveKeyMaterialHash()
I have a project where one application ("Alice") sends AES encrypted messages to another ("Bob"). Both parties have the public key of the other party - let's assume no ephemeral ...
- 311
1
vote
0
answers
138
views
Signature in my generated csr is invalid. What can be the probable reason?
I am using safenet sdk's library to generate public key and private key in Dongle. Then, I am sending public key as bits to my swift application. I am also signing my certification info with private ...
- 71
0
votes
1
answer
129
views
How to implement OpenCL to a program which uses GMP Library? The Kernel Code is not recognizing mpz_class and mpz_invert
I am trying to implement OpenCL for a C++ project which uses GMP Library (using Ubuntu). But the Kernel code is not recognizing mpz_class, its variables or any of the GMP functions. It is also not ...
0
votes
1
answer
277
views
Bcryptdecrypt unable to decrypt data correctly
I have some data that was previously encrtypted with cryptdecrypt APIs. Since it is deprecated I am supposed to move to the latest bcryptdecrypt (CNG)APIs. But with this code I am not able to decrypt ...
- 63
-1
votes
2
answers
303
views
How to get 11 bits representation from 8 bit (uint8_t) array in C++
I am trying to implement **BIP39 **standard in my project. Everything else if fine but I am badly stuck and I have searched Google and ChatGPT to the greatest depths, but no solution found.
I have ...
1
vote
2
answers
316
views
How to generate extremely large random numbers? [closed]
What is the best way to generate large random numbers (bigger than 10e32)? I have seen a lot of things for better generations (mt19937 instead of rand()) but they are still relatively limited in size. ...
- 13
-8
votes
4
answers
903
views
Fastest way to bring a range [from, to] of 64-bit integers into pseudo-random order, with same results across all platforms?
Given some interval [a, b] of indices (64-bit unsigned integers), I would like to quickly obtain an array that contains all of these indices ordered according to a uniformly distributed hash function, ...
- 486
1
vote
2
answers
326
views
Can't load generated public key from NodeJS into Windows via CNG APIs
I generate RSA public/private key pairs in NodeJS using crypto library:
crypto.generateKeyPair(
"rsa",
{
modulusLength: 1024,
publicKeyEncoding: {
type: &...
- 2,184
-2
votes
1
answer
68
views
The C++ program incorrectly outputs the message
My program encrypts and decrypts the message according to Shamir's algorithm, one finally decrypted message does not converge with the input, they say that this problem may be related to encoding, ...
- 3
0
votes
1
answer
696
views
Updating from Windows CryptDecrypt() to NCryptDecrypt() returns NTE_INVALID_PARAMETER(0x80090027) or STATUS_UNSUCCESSFUL(0xC0000001)?
Currently updating from Windows CryptDecrypt() [API is deprecated] to NCryptDecrypt() [Cryptography Next Generation].
The minimal sample code below tries to encrypt/decrypt using RSA 1024-bit.
Running ...
- 2,205
6
votes
1
answer
1k
views
Regarding the use of secp256r1 and x25519?
I'm implementing some protocol using some 3rd party repository (Private Join and Compute), and the repo only supports built-in curves in FIPS modules (P-224, 256, 348 and 512) in openssl when creating ...
- 63
1
vote
1
answer
74
views
How can I convert a number (of type std::string) to its binary representation in std::vector<bool> in C++ without external libraries?
I'm trying to convert a string (like "12345") to its binary representation held in a boolean vector (so it would be {1,1,0,0,0,0,0,0,1,1,1,0,0,1} but the current attempt only works for ...
- 15
1
vote
2
answers
138
views
Is there a significant difference between using a in built random number generator vs using cryptographic random number generator?
I was going through the Crypto++ library RNG page and I was wondering is there any issues with using something like
std::srand(std::time(nullptr)); //using the current time as seed
compared to the ...
- 21
1
vote
1
answer
160
views
OpenWall BCrypt: Example of Hashing Input using crypt_r and explanation of inputs and best practice
I am struggling with finding examples for OpenWall's bcrypt implementation that use crypt_gensalt_rn and crypt_r that also explain in depth exactly what is happening in terms of input, settings etc ...
- 204
0
votes
1
answer
298
views
RSA-CBC decrypt it using C++
I'm stuck with the problem of decrypting AES-CBC ecrypted string.
I have JS code which decrypt that string but I need do that in C++.
Key is string of SHA512 hash, and message is string of Base64.
The ...
- 37
0
votes
0
answers
120
views
How to use hard-coded keys for two parties to form key agreement using ECDH from cryptopp library as demonstration?
I need your help through This code that is an example of how to use the Crypto++ library to perform a Diffie-Hellman key exchange. The code uses the secp256r1 curve to generate the public and private ...
- 1
0
votes
1
answer
521
views
OpenSSl 3 not verifying (using) tag using chacha20 poly1305
i just started learning openssl,
when i use chacha20_poly1305() to encrypt and mac some text, it does not work
What am i doing wrong, how does this work
int main( )
{
unsigned char key[] = "...
- 1
0
votes
1
answer
399
views
'message hash or MAC not valid' AES GCM when decrypting
I am trying to convert a snippet of Python code to C++. The Python code reads ciphertext and a key from a file and uses PyCryptoDome to decrypt. I have tried to replicate this behavior in C++, however,...
- 13
1
vote
1
answer
362
views
How to verify RSA signature generated by Python-RSA using Crypto++
I have a server written in Python, and a C++ client. The Python server has a private RSA key, and the redistributable C++ client has the paired public key. The C++ client sends a string to the Python ...
- 11
0
votes
0
answers
54
views
What is causing this unexpected output?
I am writing a disk encryption utility with the cryptopp library in c++ but the program fails to work when i pass the salt and password from the commandline. It works perfectly fine when the values ...
- 35
-1
votes
1
answer
268
views
Crypto++ | HexEncoder sometimes encodes incorrectly | HexEncoder not working consistently | Undefined behaviour?
I have written a simple encrypt & decrypt function and everything works. Except sometimes the HexEncoder seems to encode the cipher far too way small. Therefore the decryption fails. But this ...
- 15
0
votes
2
answers
633
views
How to decrypt a file in memory?
I'm encrypting a file this way:
#include <cryptopp/files.h>
#include <cryptopp/modes.h>
#include <cryptopp/osrng.h>
#include <cryptopp/base64.h>
#include <cryptopp/hex.h>
...
- 379
0
votes
1
answer
500
views
Poco C++: Poco::Crypto::RSAKey class is deprecated. How to encrypt plain text with private key?
For a my personal C++ project, I'd like been able to encrypt plain text data using private key. In my project I make an extensive usage of Poco C++ library, and I'd like handle such feature with it.
...
7
votes
1
answer
6k
views
How to encrypt a string using OpenSSL C library and a public key file?
What is the recommended way of encrypting a short std::string into another std::string using the openssl C library (not the command-line tool of the same name) using a public keyfile, and knowing the ...
- 1,366