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98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
#include <llarp/crypto.h>
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#include <sodium.h>
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#include <assert.h>
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namespace llarp {
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namespace sodium {
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static bool xchacha20(llarp_buffer_t buff, llarp_sharedkey_t k, llarp_nounce_t n) {
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uint8_t *base = (uint8_t *)buff.base;
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return crypto_stream_xchacha20_xor(base, base, buff.sz, n, k) == 0;
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}
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static bool dh(llarp_sharedkey_t *shared, uint8_t *client_pk, uint8_t *server_pk,
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uint8_t *remote_key, uint8_t *local_key) {
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uint8_t *out = *shared;
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const size_t outsz = SHAREDKEYSIZE;
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crypto_generichash_state h;
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if (crypto_scalarmult(out, local_key, remote_key) == -1)
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return false;
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crypto_generichash_init(&h, NULL, 0U, outsz);
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crypto_generichash_update(&h, client_pk, sizeof(llarp_pubkey_t));
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crypto_generichash_update(&h, server_pk, sizeof(llarp_pubkey_t));
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crypto_generichash_update(&h, out, crypto_scalarmult_BYTES);
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crypto_generichash_final(&h, out, outsz);
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return true;
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}
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static bool dh_client(llarp_sharedkey_t *shared, llarp_pubkey_t pk,
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llarp_tunnel_nounce_t n, llarp_seckey_t sk) {
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llarp_pubkey_t local_pk;
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crypto_scalarmult_base(local_pk, sk);
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if (dh(shared, local_pk, pk, pk, sk)) {
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return crypto_generichash(*shared, SHAREDKEYSIZE, *shared, SHAREDKEYSIZE, n,
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TUNNOUNCESIZE) != -1;
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}
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return false;
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}
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static bool dh_server(llarp_sharedkey_t *shared, llarp_pubkey_t pk,
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llarp_tunnel_nounce_t n, llarp_seckey_t sk) {
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llarp_pubkey_t local_pk;
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crypto_scalarmult_base(local_pk, sk);
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if (dh(shared, pk, local_pk, pk, sk)) {
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return crypto_generichash(*shared, SHAREDKEYSIZE, *shared, SHAREDKEYSIZE, n,
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TUNNOUNCESIZE) != -1;
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}
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return false;
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}
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static bool hash(llarp_hash_t *result, llarp_buffer_t buff) {
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const uint8_t *base = (const uint8_t *)buff.base;
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return crypto_generichash(*result, HASHSIZE, base, buff.sz, nullptr, 0) != -1;
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}
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static bool hmac(llarp_hash_t *result, llarp_buffer_t buff, llarp_seckey_t secret) {
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const uint8_t *base = (const uint8_t *)buff.base;
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return crypto_generichash(*result, sizeof(llarp_hash_t), base, buff.sz,
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secret, HMACSECSIZE) != -1;
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}
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static bool sign(llarp_sig_t *result, llarp_seckey_t secret, llarp_buffer_t buff) {
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const uint8_t *base = (const uint8_t *)buff.base;
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return crypto_sign_detached(*result, nullptr, base, buff.sz, secret) != -1;
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}
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static bool verify(llarp_pubkey_t pub, llarp_buffer_t buff, llarp_sig_t sig) {
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const uint8_t *base = (const uint8_t *)buff.base;
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return crypto_sign_verify_detached(sig, base, buff.sz, pub) != -1;
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}
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static void 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 void keygen(struct llarp_keypair * keys)
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{
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randombytes(keys->sec, sizeof(llarp_seckey_t));
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unsigned char sk[64];
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crypto_sign_seed_keypair(keys->pub, sk, keys->sec);
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}
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} // namespace sodium
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} // namespace llarp
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extern "C" {
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void llarp_crypto_libsodium_init(struct llarp_crypto *c) {
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assert(sodium_init() != -1);
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c->xchacha20 = llarp::sodium::xchacha20;
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c->dh_client = llarp::sodium::dh_client;
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c->dh_server = llarp::sodium::dh_server;
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c->hash = llarp::sodium::hash;
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c->hmac = llarp::sodium::hmac;
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c->sign = llarp::sodium::sign;
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c->verify = llarp::sodium::verify;
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c->randomize = llarp::sodium::randomize;
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c->keygen = llarp::sodium::keygen;
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}
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}
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