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#include <assert.h>
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#include <crypto.h>
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#include <sodium/crypto_generichash.h>
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#include <sodium/crypto_sign.h>
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#include <sodium/crypto_scalarmult.h>
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#include <sodium/crypto_stream_xchacha20.h>
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#include <crypto.hpp>
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#include "mem.hpp"
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extern "C"
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{
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extern int
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sodium_init(void);
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}
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namespace llarp
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{
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namespace sodium
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{
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static bool
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xchacha20(llarp_buffer_t buff, const byte_t *k, const byte_t *n)
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{
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return crypto_stream_xchacha20_xor(buff.base, buff.base, buff.sz, n, k)
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== 0;
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}
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static bool
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dh(uint8_t *out, const uint8_t *client_pk, const uint8_t *server_pk,
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const uint8_t *themPub, const uint8_t *usSec)
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{
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llarp::SharedSecret shared;
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crypto_generichash_state h;
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const size_t outsz = SHAREDKEYSIZE;
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if(crypto_scalarmult_curve25519(shared, usSec, themPub))
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return false;
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crypto_generichash_blake2b_init(&h, nullptr, 0U, outsz);
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crypto_generichash_blake2b_update(&h, client_pk, 32);
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crypto_generichash_blake2b_update(&h, server_pk, 32);
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crypto_generichash_blake2b_update(&h, shared, 32);
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crypto_generichash_blake2b_final(&h, out, outsz);
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return true;
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}
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static bool
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dh_client(uint8_t *shared, const uint8_t *pk, const uint8_t *sk,
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const uint8_t *n)
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{
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llarp::SharedSecret dh_result;
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if(dh(dh_result, llarp::seckey_topublic(sk), pk, pk, sk))
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{
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return crypto_generichash_blake2b(shared, 32, n, 32, dh_result, 32)
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!= -1;
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}
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llarp::LogWarn("crypto::dh_client - dh failed");
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return false;
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}
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static bool
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dh_server(uint8_t *shared, const uint8_t *pk, const uint8_t *sk,
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const uint8_t *n)
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{
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llarp::SharedSecret dh_result;
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if(dh(dh_result, pk, llarp::seckey_topublic(sk), pk, sk))
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{
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return crypto_generichash_blake2b(shared, 32, n, 32, dh_result, 32)
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!= -1;
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}
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llarp::LogWarn("crypto::dh_server - dh failed");
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return false;
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}
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static bool
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hash(uint8_t *result, llarp_buffer_t buff)
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{
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return crypto_generichash_blake2b(result, HASHSIZE, buff.base, buff.sz,
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nullptr, 0)
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!= -1;
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}
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static bool
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shorthash(uint8_t *result, llarp_buffer_t buff)
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{
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return crypto_generichash_blake2b(result, SHORTHASHSIZE, buff.base,
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buff.sz, nullptr, 0)
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!= -1;
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}
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static bool
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hmac(uint8_t *result, llarp_buffer_t buff, const uint8_t *secret)
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{
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return crypto_generichash_blake2b(result, HMACSIZE, buff.base, buff.sz,
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secret, HMACSECSIZE)
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!= -1;
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}
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static bool
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sign(uint8_t *result, const uint8_t *secret, llarp_buffer_t buff)
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{
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return crypto_sign_detached(result, nullptr, buff.base, buff.sz, secret)
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!= -1;
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}
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static bool
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verify(const uint8_t *pub, llarp_buffer_t buff, const uint8_t *sig)
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{
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return crypto_sign_verify_detached(sig, buff.base, buff.sz, pub) != -1;
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}
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static void
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randomize(llarp_buffer_t buff)
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{
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randombytes((unsigned char *)buff.base, buff.sz);
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}
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static inline void
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randbytes(void *ptr, size_t sz)
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{
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randombytes((unsigned char *)ptr, sz);
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}
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static void
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sigkeygen(uint8_t *keys)
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{
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crypto_sign_keypair(keys + 32, keys);
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}
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static void
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enckeygen(uint8_t *keys)
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{
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randombytes(keys, 32);
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crypto_scalarmult_curve25519_base(keys + 32, keys);
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}
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} // namespace sodium
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const byte_t *
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seckey_topublic(const byte_t *sec)
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{
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return sec + 32;
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}
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namespace pq
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{
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bool
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encrypt(byte_t *ciphertext, byte_t *sharedkey, const byte_t *pubkey)
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{
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return crypto_kem_enc(ciphertext, sharedkey, pubkey) != -1;
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}
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bool
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decrypt(const byte_t *ciphertext, byte_t *sharedkey,
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const byte_t *secretkey)
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{
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return crypto_kem_dec(sharedkey, ciphertext, secretkey) != -1;
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}
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void
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keygen(byte_t *keypair)
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{
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crypto_kem_keypair(keypair + PQ_SECRETKEYSIZE, keypair);
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}
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} // namespace pq
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const byte_t *
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pq_keypair_to_public(const byte_t *k)
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{
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return k + PQ_SECRETKEYSIZE;
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}
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const byte_t *
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pq_keypair_to_secret(const byte_t *k)
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{
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return k;
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}
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Crypto::Crypto(Crypto::sodium tag)
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{
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(void)tag;
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assert(sodium_init() != -1);
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char *avx2 = std::getenv("AVX2_FORCE_DISABLE");
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if(avx2 && std::string(avx2) == "1")
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ntru_init(1);
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else
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ntru_init(0);
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this->xchacha20 = llarp::sodium::xchacha20;
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this->dh_client = llarp::sodium::dh_client;
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this->dh_server = llarp::sodium::dh_server;
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this->transport_dh_client = llarp::sodium::dh_client;
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this->transport_dh_server = llarp::sodium::dh_server;
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this->hash = llarp::sodium::hash;
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this->shorthash = llarp::sodium::shorthash;
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this->hmac = llarp::sodium::hmac;
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this->sign = llarp::sodium::sign;
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this->verify = llarp::sodium::verify;
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this->randomize = llarp::sodium::randomize;
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this->randbytes = llarp::sodium::randbytes;
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this->identity_keygen = llarp::sodium::sigkeygen;
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this->encryption_keygen = llarp::sodium::enckeygen;
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this->pqe_encrypt = llarp::pq::encrypt;
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this->pqe_decrypt = llarp::pq::decrypt;
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this->pqe_keygen = llarp::pq::keygen;
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int seed = 0;
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this->randbytes(&seed, sizeof(seed));
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srand(seed);
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}
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uint64_t
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randint()
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{
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uint64_t i;
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randombytes((byte_t *)&i, sizeof(i));
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return i;
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}
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} // namespace llarp
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