libsodium/test/default/secretstream.c

#define TEST_NAME "secretstream"
#include "cmptest.h"

int
main(void)
{
    crypto_secretstream_xchacha20poly1305_state *state;
    crypto_secretstream_xchacha20poly1305_state state_copy;
    unsigned char      *ad;
    unsigned char      *header;
    unsigned char      *k;
    unsigned char      *c1, *c2, *c3;
    unsigned char      *m1, *m2, *m3;
    unsigned char      *m1_, *m2_, *m3_;
    unsigned long long  res_len;
    size_t              ad_len;
    size_t              m1_len, m2_len, m3_len;
    int                 ret;
    unsigned char       tag;

    state = (crypto_secretstream_xchacha20poly1305_state *)
        sodium_malloc(crypto_secretstream_xchacha20poly1305_statebytes());
    header = (unsigned char *)
        sodium_malloc(crypto_secretstream_xchacha20poly1305_HEADERBYTES);

    ad_len = randombytes_uniform(100);
    m1_len = randombytes_uniform(1000);
    m2_len = randombytes_uniform(1000);
    m3_len = randombytes_uniform(1000);

    c1 = (unsigned char *)
        sodium_malloc(m1_len + crypto_secretstream_xchacha20poly1305_ABYTES);
    c2 = (unsigned char *)
        sodium_malloc(m2_len + crypto_secretstream_xchacha20poly1305_ABYTES);
    c3 = (unsigned char *)
        sodium_malloc(m3_len + crypto_secretstream_xchacha20poly1305_ABYTES);

    ad  = (unsigned char *) sodium_malloc(ad_len);
    m1  = (unsigned char *) sodium_malloc(m1_len);
    m2  = (unsigned char *) sodium_malloc(m2_len);
    m3  = (unsigned char *) sodium_malloc(m3_len);
    m1_ = (unsigned char *) sodium_malloc(m1_len);
    m2_ = (unsigned char *) sodium_malloc(m2_len);
    m3_ = (unsigned char *) sodium_malloc(m3_len);

    randombytes_buf(ad, ad_len);

    randombytes_buf(m1, m1_len);
    memcpy(m1_, m1, m1_len);
    randombytes_buf(m2, m2_len);
    memcpy(m2_, m2, m2_len);
    randombytes_buf(m3, m3_len);
    memcpy(m3_, m3, m3_len);

    k = (unsigned char *)
        sodium_malloc(crypto_secretstream_xchacha20poly1305_KEYBYTES);
    crypto_secretstream_xchacha20poly1305_keygen(k);

    /* push */

    ret = crypto_secretstream_xchacha20poly1305_init_push(state, header, k);
    assert(ret == 0);

    ret = crypto_secretstream_xchacha20poly1305_push
        (state, c1, &res_len, m1, m1_len, NULL, 0, 0);
    assert(ret == 0);
    assert(res_len == m1_len + crypto_secretstream_xchacha20poly1305_ABYTES);

    ret = crypto_secretstream_xchacha20poly1305_push
        (state, c2, NULL, m2, m2_len, ad, 0, 0);
    assert(ret == 0);

    ret = crypto_secretstream_xchacha20poly1305_push
        (state, c3, NULL, m3, m3_len, ad, ad_len,
         crypto_secretstream_xchacha20poly1305_TAG_FINAL);
    assert(ret == 0);

    /* pull */

    ret = crypto_secretstream_xchacha20poly1305_init_pull(state, header, k);
    assert(ret == 0);

    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m1, &res_len, &tag,
         c1, m1_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == 0);
    assert(tag == 0);
    assert(memcmp(m1, m1_, m1_len) == 0);
    assert(res_len == m1_len);

    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m2, NULL, &tag,
         c2, m2_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == 0);
    assert(tag == 0);
    assert(memcmp(m2, m2_, m2_len) == 0);

    if (ad_len > 0) {
        ret = crypto_secretstream_xchacha20poly1305_pull
            (state, m3, NULL, &tag,
             c3, m3_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
        assert(ret == -1);
    }
    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m3, NULL, &tag,
         c3, m3_len + crypto_secretstream_xchacha20poly1305_ABYTES, ad, ad_len);
    assert(ret == 0);
    assert(tag == crypto_secretstream_xchacha20poly1305_TAG_FINAL);
    assert(memcmp(m3, m3_, m3_len) == 0);

    /* previous with FINAL tag */

    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m3, NULL, &tag,
         c3, m3_len + crypto_secretstream_xchacha20poly1305_ABYTES, ad, ad_len);
    assert(ret == -1);

    /* previous without a tag */

    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m2, NULL, &tag,
         c2, m2_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == -1);

    /* short ciphertext */

    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m2, NULL, &tag, c2,
         randombytes_uniform(crypto_secretstream_xchacha20poly1305_ABYTES),
         NULL, 0);
    assert(ret == -1);
    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m2, NULL, &tag, c2, 0, NULL, 0);
    assert(ret == -1);

    /* empty ciphertext */

    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m2, NULL, &tag, c2,
         crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == -1);

    /* without explicit rekeying */

    ret = crypto_secretstream_xchacha20poly1305_init_push(state, header, k);
    assert(ret == 0);
    ret = crypto_secretstream_xchacha20poly1305_push
        (state, c1, NULL, m1, m1_len, NULL, 0, 0);
    assert(ret == 0);
    ret = crypto_secretstream_xchacha20poly1305_push
        (state, c2, NULL, m2, m2_len, NULL, 0, 0);
    assert(ret == 0);

    ret = crypto_secretstream_xchacha20poly1305_init_pull(state, header, k);
    assert(ret == 0);
    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m1, NULL, &tag,
         c1, m1_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == 0);
    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m2, NULL, &tag,
         c2, m2_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == 0);

    /* with explicit rekeying */

    ret = crypto_secretstream_xchacha20poly1305_init_push(state, header, k);
    assert(ret == 0);
    ret = crypto_secretstream_xchacha20poly1305_push
        (state, c1, NULL, m1, m1_len, NULL, 0, 0);
    assert(ret == 0);

    crypto_secretstream_xchacha20poly1305_rekey(state);

    ret = crypto_secretstream_xchacha20poly1305_push
        (state, c2, NULL, m2, m2_len, NULL, 0, 0);
    assert(ret == 0);

    ret = crypto_secretstream_xchacha20poly1305_init_pull(state, header, k);
    assert(ret == 0);
    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m1, NULL, &tag,
         c1, m1_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == 0);

    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m2, NULL, &tag,
         c2, m2_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == -1);

    crypto_secretstream_xchacha20poly1305_rekey(state);

    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m2, NULL, &tag,
         c2, m2_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == 0);

    /* New stream */

    ret = crypto_secretstream_xchacha20poly1305_init_push(state, header, k);
    assert(ret == 0);

    ret = crypto_secretstream_xchacha20poly1305_push
        (state, c1, &res_len, m1, m1_len, NULL, 0,
         crypto_secretstream_xchacha20poly1305_TAG_PUSH);
    assert(ret == 0);
    assert(res_len == m1_len + crypto_secretstream_xchacha20poly1305_ABYTES);

    /* Force a counter overflow, check that the key has been updated
     * even though the tag was not changed to REKEY */

    memset(state->nonce, 0xff, 4U);
    state_copy = *state;

    ret = crypto_secretstream_xchacha20poly1305_push
        (state, c2, NULL, m2, m2_len, ad, 0, 0);
    assert(ret == 0);

    assert(memcmp(state_copy.k, state->k, sizeof state->k) != 0);
    assert(memcmp(state_copy.nonce, state->nonce, sizeof state->nonce) != 0);
    assert(state->nonce[0] == 1U);
    assert(sodium_is_zero(state->nonce + 1, 3U));

    ret = crypto_secretstream_xchacha20poly1305_init_pull(state, header, k);
    assert(ret == 0);

    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m1, &res_len, &tag,
         c1, m1_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == 0);
    assert(tag == crypto_secretstream_xchacha20poly1305_TAG_PUSH);
    assert(memcmp(m1, m1_, m1_len) == 0);
    assert(res_len == m1_len);

    memset(state->nonce, 0xff, 4U);

    ret = crypto_secretstream_xchacha20poly1305_pull
        (state, m2, NULL, &tag,
         c2, m2_len + crypto_secretstream_xchacha20poly1305_ABYTES, NULL, 0);
    assert(ret == 0);
    assert(tag == 0);
    assert(memcmp(m2, m2_, m2_len) == 0);

    sodium_free(m3_);
    sodium_free(m2_);
    sodium_free(m1_);
    sodium_free(m3);
    sodium_free(m2);
    sodium_free(m1);
    sodium_free(ad);
    sodium_free(c3);
    sodium_free(c2);
    sodium_free(c1);
    sodium_free(k);
    sodium_free(header);
    sodium_free(state);

    assert(crypto_secretstream_xchacha20poly1305_abytes() ==
           crypto_secretstream_xchacha20poly1305_ABYTES);
    assert(crypto_secretstream_xchacha20poly1305_headerbytes() ==
           crypto_secretstream_xchacha20poly1305_HEADERBYTES);
    assert(crypto_secretstream_xchacha20poly1305_keybytes() ==
           crypto_secretstream_xchacha20poly1305_KEYBYTES);
    assert(crypto_secretstream_xchacha20poly1305_messagebytes_max() ==
           crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX);

    assert(crypto_secretstream_xchacha20poly1305_tag_message() ==
           crypto_secretstream_xchacha20poly1305_TAG_MESSAGE);
    assert(crypto_secretstream_xchacha20poly1305_tag_push() ==
           crypto_secretstream_xchacha20poly1305_TAG_PUSH);
    assert(crypto_secretstream_xchacha20poly1305_tag_rekey() ==
           crypto_secretstream_xchacha20poly1305_TAG_REKEY);
    assert(crypto_secretstream_xchacha20poly1305_tag_final() ==
           crypto_secretstream_xchacha20poly1305_TAG_FINAL);

    printf("OK\n");

    return 0;
}