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vendor/picotls/lib/openssl.c  view on Meta::CPAN

        ret = 0;
        goto Exit;
    }

    if ((peer_point = x9_62_decode_point(group, peerkey, ctx->bn_ctx)) == NULL) {
        ret = PTLS_ALERT_DECODE_ERROR;
        goto Exit;
    }
    if ((ret = ecdh_calc_secret(secret, group, ctx->privkey, peer_point)) != 0)
        goto Exit;

Exit:
    if (peer_point != NULL)
        EC_POINT_free(peer_point);
    if (release) {
        x9_62_free_context(ctx);
        *_ctx = NULL;
    }
    return ret;
}

static int x9_62_create_context(ptls_key_exchange_algorithm_t *algo, struct st_x9_62_keyex_context_t **ctx)
{
    int ret;

    if ((*ctx = (struct st_x9_62_keyex_context_t *)malloc(sizeof(**ctx))) == NULL) {
        ret = PTLS_ERROR_NO_MEMORY;
        goto Exit;
    }
    **ctx = (struct st_x9_62_keyex_context_t){{algo, {NULL}, x9_62_on_exchange}};

    if (((*ctx)->bn_ctx = BN_CTX_new()) == NULL) {
        ret = PTLS_ERROR_NO_MEMORY;
        goto Exit;
    }

    ret = 0;
Exit:
    if (ret != 0 && *ctx != NULL) {
        x9_62_free_context(*ctx);
        *ctx = NULL;
    }
    return ret;
}

static int x9_62_setup_pubkey(struct st_x9_62_keyex_context_t *ctx)
{
    const EC_GROUP *group = EC_KEY_get0_group(ctx->privkey);
    const EC_POINT *pubkey = EC_KEY_get0_public_key(ctx->privkey);
    if ((ctx->super.pubkey = x9_62_encode_point(group, pubkey, ctx->bn_ctx)).base == NULL)
        return PTLS_ERROR_NO_MEMORY;
    return 0;
}

static int x9_62_create_key_exchange(ptls_key_exchange_algorithm_t *algo, ptls_key_exchange_context_t **_ctx)
{
    EC_GROUP *group = NULL;
    struct st_x9_62_keyex_context_t *ctx = NULL;
    int ret;

    /* FIXME use a global? */
    if ((group = EC_GROUP_new_by_curve_name((int)algo->data)) == NULL) {
        ret = PTLS_ERROR_LIBRARY;
        goto Exit;
    }
    if ((ret = x9_62_create_context(algo, &ctx)) != 0)
        goto Exit;
    if ((ctx->privkey = ecdh_generate_key(group)) == NULL) {
        ret = PTLS_ERROR_LIBRARY;
        goto Exit;
    }
    if ((ret = x9_62_setup_pubkey(ctx)) != 0)
        goto Exit;
    ret = 0;

Exit:
    if (group != NULL)
        EC_GROUP_free(group);
    if (ret == 0) {
        *_ctx = &ctx->super;
    } else {
        if (ctx != NULL)
            x9_62_free_context(ctx);
        *_ctx = NULL;
    }

    return ret;
}

static int x9_62_init_key(ptls_key_exchange_algorithm_t *algo, ptls_key_exchange_context_t **_ctx, EC_KEY *eckey)
{
    struct st_x9_62_keyex_context_t *ctx = NULL;
    int ret;

    if ((ret = x9_62_create_context(algo, &ctx)) != 0)
        goto Exit;
    ctx->privkey = eckey;
    if ((ret = x9_62_setup_pubkey(ctx)) != 0)
        goto Exit;
    ret = 0;

Exit:
    if (ret == 0) {
        *_ctx = &ctx->super;
    } else {
        if (ctx != NULL)
            x9_62_free_context(ctx);
        *_ctx = NULL;
    }
    return ret;
}

static int x9_62_key_exchange(EC_GROUP *group, ptls_iovec_t *pubkey, ptls_iovec_t *secret, ptls_iovec_t peerkey, BN_CTX *bn_ctx)
{
    EC_POINT *peer_point = NULL;
    EC_KEY *privkey = NULL;
    int ret;

    *pubkey = (ptls_iovec_t){NULL};
    *secret = (ptls_iovec_t){NULL};