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53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
#include <sarp/crypto.h>
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#include <sodium/crypto_stream_xchacha20.h>
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#include <sodium/crypto_generichash.h>
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#include <sodium/crypto_scalarmult.h>
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namespace sarp
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{
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namespace sodium
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{
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int xchacha20(sarp_buffer_t buff, sarp_symkey_t k, sarp_nounce_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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}
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int dh(sarp_sharedkey_t * shared, uint8_t * client_pk, uint8_t * server_pk, uint8_t * remote_key, uint8_t * local_key)
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{
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uint8_t * out = *shared;
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const size_t outsz = sizeof(sarp_sharedkey_t);
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crypto_generichash_state h;
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if(crypto_scalarmult(out, local_key, remote_key) == -1) return -1;
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crypto_generichash_init(&h, NULL, 0U, outsz);
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crypto_generichash_update(&h, client_pk, sizeof(sarp_pubkey_t));
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crypto_generichash_update(&h, server_pk, sizeof(sarp_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 0;
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}
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int dh_client(sarp_sharedkey_t * shared, sarp_pubkey_t pk, sarp_seckey_t sk)
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{
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sarp_pubkey_t local_pk;
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crypto_scalarmult_base(local_pk, sk);
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return dh(shared, local_pk, pk, pk, sk);
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}
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int dh_server(sarp_sharedkey_t * shared, sarp_pubkey_t pk, sarp_seckey_t sk)
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{
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sarp_pubkey_t local_pk;
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crypto_scalarmult_base(local_pk, sk);
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return dh(shared, pk, local_pk, pk, sk);
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}
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}
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}
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extern "C" {
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void sarp_crypto_libsodium_init(struct sarp_crypto * c)
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{
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c->xchacha20 = sarp::sodium::xchacha20;
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c->dh_client = sarp::sodium::dh_client;
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c->dh_server = sarp::sodium::dh_server;
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}
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}
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