49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
/*
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* Based on
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* 1. OpenSSL lib
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* 2. PurpleI2P source code
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* 3. cppcodec lib
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*
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* PUBLIC DOMAIN C++ WRAPPER
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* acetone, 2022
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*/
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#include "chacha20.h"
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#include <memory>
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#include <openssl/evp.h>
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namespace FriendlyCrypto {
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std::vector<uint8_t> chaCha20 (const std::vector<uint8_t> &msg, const std::array<uint8_t, 32> &key, const uint8_t *nonce)
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{
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uint8_t fakenonce[24] {0};
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if (!nonce)
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{
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nonce = fakenonce;
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}
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EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new ();
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uint32_t iv[4];
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iv[0] = htole32 (1); memcpy (iv + 1, nonce, 12); // counter | nonce
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EVP_EncryptInit_ex(ctx, EVP_chacha20(), NULL, key.data(), reinterpret_cast<const uint8_t*>(iv));
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std::vector<uint8_t> out(msg.size());
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int outlen = msg.size();
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EVP_EncryptUpdate(ctx, out.data(), &outlen, msg.data(), msg.size());
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EVP_EncryptFinal_ex(ctx, NULL, &outlen);
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EVP_CIPHER_CTX_free (ctx);
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return out;
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}
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std::vector<uint8_t> chaCha20 (const uint8_t *msg, size_t msgSize, const std::array<uint8_t, 32> &key, const uint8_t *nonce)
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{
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std::vector<uint8_t> vector;
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for (size_t i = 0; i < msgSize; ++i)
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{
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vector.push_back(msg[i]);
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}
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return chaCha20(vector, key, nonce);
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}
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} // namespace
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