/*

 * Copyright (c) 2020-2026 Yubico AB. All rights reserved.

 * Use of this source code is governed by a BSD-style

 * license that can be found in the LICENSE file.

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include <openssl/sha.h>

#include "fido.h"

#include "fido/es256.h"

#define LARGEBLOB_DIGEST_LENGTH 16

#define LARGEBLOB_NONCE_LENGTH  12

#define LARGEBLOB_TAG_LENGTH    16

typedef struct largeblob {

        size_t origsiz;

        fido_blob_t ciphertext;

        fido_blob_t nonce;

} largeblob_t;

static largeblob_t *

largeblob_new(void)

{

        return calloc(1, sizeof(largeblob_t));

}

static void

largeblob_reset(largeblob_t *blob)

{

        fido_blob_reset(&blob->ciphertext);

        fido_blob_reset(&blob->nonce);

        blob->origsiz = 0;

}

static void

largeblob_free(largeblob_t **blob_ptr)

{

        largeblob_t *blob;

        if (blob_ptr == NULL || (blob = *blob_ptr) == NULL)

                return;

        largeblob_reset(blob);

        free(blob);

        *blob_ptr = NULL;

}

static int

largeblob_aad(fido_blob_t *aad, uint64_t size)

{

        uint8_t buf[4 + sizeof(uint64_t)];

        buf[0] = 0x62; /* b */

        buf[1] = 0x6c; /* l */

        buf[2] = 0x6f; /* o */

        buf[3] = 0x62; /* b */

        size = htole64(size);

        memcpy(&buf[4], &size, sizeof(uint64_t));

        return fido_blob_set(aad, buf, sizeof(buf));

}

static fido_blob_t *

largeblob_decrypt(const largeblob_t *blob, const fido_blob_t *key)

{

        fido_blob_t *plaintext = NULL, *aad = NULL;

        int ok = -1;

        if ((plaintext = fido_blob_new()) == NULL ||

            (aad = fido_blob_new()) == NULL) {

                fido_log_debug("%s: fido_blob_new", __func__);

                goto fail;

        }

        if (largeblob_aad(aad, blob->origsiz) < 0) {

                fido_log_debug("%s: largeblob_aad", __func__);

                goto fail;

        }

        if (aes256_gcm_dec(key, &blob->nonce, aad, &blob->ciphertext,

            plaintext) < 0) {

                fido_log_debug("%s: aes256_gcm_dec", __func__);

                goto fail;

        }

        ok = 0;

fail:

        fido_blob_free(&aad);

        if (ok < 0)

                fido_blob_free(&plaintext);

        return plaintext;

}

static int

largeblob_get_nonce(largeblob_t *blob)

{

        uint8_t buf[LARGEBLOB_NONCE_LENGTH];

        int ok = -1;

        if (fido_get_random(buf, sizeof(buf)) < 0) {

                fido_log_debug("%s: fido_get_random", __func__);

                goto fail;

        }

        if (fido_blob_set(&blob->nonce, buf, sizeof(buf)) < 0) {

                fido_log_debug("%s: fido_blob_set", __func__);

                goto fail;

        }

        ok = 0;

fail:

        explicit_bzero(buf, sizeof(buf));

        return ok;

}

static int

largeblob_seal(largeblob_t *blob, const fido_blob_t *body,

    const fido_blob_t *key)

{

        fido_blob_t *plaintext = NULL, *aad = NULL;

        int ok = -1;

        if ((plaintext = fido_blob_new()) == NULL ||

            (aad = fido_blob_new()) == NULL) {

                fido_log_debug("%s: fido_blob_new", __func__);

                goto fail;

        }

        if (fido_compress(plaintext, body) != FIDO_OK) {

                fido_log_debug("%s: fido_compress", __func__);

                goto fail;

        }

        if (largeblob_aad(aad, body->len) < 0) {

                fido_log_debug("%s: largeblob_aad", __func__);

                goto fail;

        }

        if (largeblob_get_nonce(blob) < 0) {

                fido_log_debug("%s: largeblob_get_nonce", __func__);

                goto fail;

        }

        if (aes256_gcm_enc(key, &blob->nonce, aad, plaintext,

            &blob->ciphertext) < 0) {

                fido_log_debug("%s: aes256_gcm_enc", __func__);

                goto fail;

        }

        blob->origsiz = body->len;

        ok = 0;

fail:

        fido_blob_free(&plaintext);

        fido_blob_free(&aad);

        return ok;

}

static int

largeblob_get_tx(fido_dev_t *dev, size_t offset, size_t count, int *ms)

{

        fido_blob_t f;

        cbor_item_t *argv[3];

        int r;

        memset(argv, 0, sizeof(argv));

        memset(&f, 0, sizeof(f));

        if ((argv[0] = cbor_build_uint(count)) == NULL ||

            (argv[2] = cbor_build_uint(offset)) == NULL) {

                fido_log_debug("%s: cbor encode", __func__);

                r = FIDO_ERR_INTERNAL;

                goto fail;

        }

        if (cbor_build_frame(CTAP_CBOR_LARGEBLOB, argv, nitems(argv), &f) < 0 ||

            fido_tx(dev, CTAP_CMD_CBOR, f.ptr, f.len, ms) < 0) {

                fido_log_debug("%s: fido_tx", __func__);

                r = FIDO_ERR_TX;

                goto fail;

        }

        r = FIDO_OK;

fail:

        cbor_vector_free(argv, nitems(argv));

        free(f.ptr);

        return r;

}

static int

parse_largeblob_reply(const cbor_item_t *key, const cbor_item_t *val,

    void *arg)

{

        if (cbor_isa_uint(key) == false ||

            cbor_int_get_width(key) != CBOR_INT_8 ||

            cbor_get_uint8(key) != 1) {

                fido_log_debug("%s: cbor type", __func__);

                return 0; /* ignore */

        }

        return fido_blob_decode(val, arg);

}

static int

largeblob_get_rx(fido_dev_t *dev, fido_blob_t **chunk, int *ms)

{

        unsigned char *msg;

        int msglen, r;

        *chunk = NULL;

        if ((msg = malloc(FIDO_MAXMSG)) == NULL) {

                r = FIDO_ERR_INTERNAL;

                goto out;

        }

        if ((msglen = fido_rx(dev, CTAP_CMD_CBOR, msg, FIDO_MAXMSG, ms)) < 0) {

                fido_log_debug("%s: fido_rx", __func__);

                r = FIDO_ERR_RX;

                goto out;

        }

        if ((*chunk = fido_blob_new()) == NULL) {

                fido_log_debug("%s: fido_blob_new", __func__);

                r = FIDO_ERR_INTERNAL;

                goto out;

        }

        if ((r = cbor_parse_reply(msg, (size_t)msglen, *chunk,

            parse_largeblob_reply)) != FIDO_OK) {

                fido_log_debug("%s: parse_largeblob_reply", __func__);

                goto out;

        }

        r = FIDO_OK;

out:

        if (r != FIDO_OK)

                fido_blob_free(chunk);

        freezero(msg, FIDO_MAXMSG);

        return r;

}

static cbor_item_t *

largeblob_array_load(const uint8_t *ptr, size_t len)

{

        struct cbor_load_result cbor;

        cbor_item_t *item;

        if (len < LARGEBLOB_DIGEST_LENGTH) {

                fido_log_debug("%s: len", __func__);

                return NULL;

        }

        len -= LARGEBLOB_DIGEST_LENGTH;

        if ((item = cbor_load(ptr, len, &cbor)) == NULL) {

                fido_log_debug("%s: cbor_load", __func__);

                return NULL;

        }

        if (!cbor_isa_array(item) || !cbor_array_is_definite(item)) {

                fido_log_debug("%s: cbor type", __func__);

                cbor_decref(&item);

                return NULL;

        }

        return item;

}

static size_t

get_chunklen(fido_dev_t *dev)

{

        uint64_t maxchunklen;

        if ((maxchunklen = fido_dev_maxmsgsize(dev)) > SIZE_MAX)

                maxchunklen = SIZE_MAX;

        if (maxchunklen > FIDO_MAXMSG)

                maxchunklen = FIDO_MAXMSG;

        maxchunklen = maxchunklen > 64 ? maxchunklen - 64 : 0;

        return (size_t)maxchunklen;

}

static int

largeblob_do_decode(const cbor_item_t *key, const cbor_item_t *val, void *arg)

{

        largeblob_t *blob = arg;

        uint64_t origsiz;

        if (cbor_isa_uint(key) == false ||

            cbor_int_get_width(key) != CBOR_INT_8) {

                fido_log_debug("%s: cbor type", __func__);

                return 0; /* ignore */

        }

        switch (cbor_get_uint8(key)) {

        case 1: /* ciphertext */

                if (fido_blob_decode(val, &blob->ciphertext) < 0 ||

                    blob->ciphertext.len < LARGEBLOB_TAG_LENGTH)

                        return -1;

                return 0;

        case 2: /* nonce */

                if (fido_blob_decode(val, &blob->nonce) < 0 ||

                    blob->nonce.len != LARGEBLOB_NONCE_LENGTH)

                        return -1;

                return 0;

        case 3: /* origSize */

                if (!cbor_isa_uint(val) ||

                    (origsiz = cbor_get_int(val)) > SIZE_MAX)

                        return -1;

                blob->origsiz = (size_t)origsiz;

                return 0;

        default: /* ignore */

                fido_log_debug("%s: cbor type", __func__);

                return 0;

        }

}

static int

largeblob_decode(largeblob_t *blob, const cbor_item_t *item)

{

        if (!cbor_isa_map(item) || !cbor_map_is_definite(item)) {

                fido_log_debug("%s: cbor type", __func__);

                return -1;

        }

        if (cbor_map_iter(item, blob, largeblob_do_decode) < 0) {

                fido_log_debug("%s: cbor_map_iter", __func__);

                return -1;

        }

        if (fido_blob_is_empty(&blob->ciphertext) ||

            fido_blob_is_empty(&blob->nonce) || blob->origsiz == 0) {

                fido_log_debug("%s: incomplete blob", __func__);

                return -1;

        }

        return 0;

}

static cbor_item_t *

largeblob_encode(const fido_blob_t *body, const fido_blob_t *key)

{

        largeblob_t *blob;

        cbor_item_t *argv[3], *item = NULL;

        memset(argv, 0, sizeof(argv));

        if ((blob = largeblob_new()) == NULL ||

            largeblob_seal(blob, body, key) < 0) {

                fido_log_debug("%s: largeblob_seal", __func__);

                goto fail;

        }

        if ((argv[0] = fido_blob_encode(&blob->ciphertext)) == NULL ||

            (argv[1] = fido_blob_encode(&blob->nonce)) == NULL ||

            (argv[2] = cbor_build_uint(blob->origsiz)) == NULL) {

                fido_log_debug("%s: cbor encode", __func__);

                goto fail;

        }

        item = cbor_flatten_vector(argv, nitems(argv));

fail:

        cbor_vector_free(argv, nitems(argv));

        largeblob_free(&blob);

        return item;

}

static int

largeblob_array_lookup(fido_blob_t *out, size_t *idx, const cbor_item_t *item,

    const fido_blob_t *key)

{

        cbor_item_t **v;

        fido_blob_t *plaintext = NULL;

        largeblob_t blob;

        int r;

        memset(&blob, 0, sizeof(blob));

        if (idx != NULL)

                *idx = 0;

        if ((v = cbor_array_handle(item)) == NULL)

                return FIDO_ERR_INVALID_ARGUMENT;

        for (size_t i = 0; i < cbor_array_size(item); i++) {

                if (largeblob_decode(&blob, v[i]) < 0 ||

                    (plaintext = largeblob_decrypt(&blob, key)) == NULL) {

                        fido_log_debug("%s: largeblob_decode", __func__);

                        largeblob_reset(&blob);

                        continue;

                }

                if (idx != NULL)

                        *idx = i;

                break;

        }

        if (plaintext == NULL) {

                fido_log_debug("%s: not found", __func__);

                return FIDO_ERR_NOTFOUND;

        }

        if (out != NULL)

                r = fido_uncompress(out, plaintext, blob.origsiz);

        else

                r = FIDO_OK;

        fido_blob_free(&plaintext);

        largeblob_reset(&blob);

        return r;

}

static int

largeblob_array_digest(u_char out[LARGEBLOB_DIGEST_LENGTH], const u_char *data,

    size_t len)

{

        u_char dgst[SHA256_DIGEST_LENGTH];

        if (data == NULL || len == 0)

                return -1;

        if (SHA256(data, len, dgst) != dgst)

                return -1;

        memcpy(out, dgst, LARGEBLOB_DIGEST_LENGTH);

        return 0;

}

static int

largeblob_array_check(const fido_blob_t *array)

{

        u_char expected_hash[LARGEBLOB_DIGEST_LENGTH];

        size_t body_len;

        fido_log_xxd(array->ptr, array->len, __func__);

        if (array->len < sizeof(expected_hash)) {

                fido_log_debug("%s: len %zu", __func__, array->len);

                return -1;

        }

        body_len = array->len - sizeof(expected_hash);

        if (largeblob_array_digest(expected_hash, array->ptr, body_len) < 0) {

                fido_log_debug("%s: largeblob_array_digest", __func__);

                return -1;

        }

        return timingsafe_bcmp(expected_hash, array->ptr + body_len,

            sizeof(expected_hash));

}

static int

largeblob_get_array(fido_dev_t *dev, cbor_item_t **item, int *ms)

{

        fido_blob_t *array, *chunk = NULL;

        size_t n;

        int r;

        *item = NULL;

        if ((n = get_chunklen(dev)) == 0)

                return FIDO_ERR_INVALID_ARGUMENT;

        if ((array = fido_blob_new()) == NULL)

                return FIDO_ERR_INTERNAL;

        do {

                fido_blob_free(&chunk);

                if ((r = largeblob_get_tx(dev, array->len, n, ms)) != FIDO_OK ||

                    (r = largeblob_get_rx(dev, &chunk, ms)) != FIDO_OK) {

                        fido_log_debug("%s: largeblob_get_wait %zu/%zu",

                            __func__, array->len, n);

                        goto fail;

                }

                if (fido_blob_append(array, chunk->ptr, chunk->len) < 0) {

                        fido_log_debug("%s: fido_blob_append", __func__);

                        r = FIDO_ERR_INTERNAL;

                        goto fail;

                }

        } while (chunk->len == n);

        if (largeblob_array_check(array) != 0)

                *item = cbor_new_definite_array(0); /* per spec */

        else

                *item = largeblob_array_load(array->ptr, array->len);

        if (*item == NULL)

                r = FIDO_ERR_INTERNAL;

        else

                r = FIDO_OK;

fail:

        fido_blob_free(&array);

        fido_blob_free(&chunk);

        return r;

}

static int

prepare_hmac(size_t offset, const u_char *data, size_t len, fido_blob_t *hmac)

{

        uint8_t buf[32 + 2 + sizeof(uint32_t) + SHA256_DIGEST_LENGTH];

        uint32_t u32_offset;

        if (data == NULL || len == 0) {

                fido_log_debug("%s: invalid data=%p, len=%zu", __func__,

                    (const void *)data, len);

                return -1;

        }

        if (offset > UINT32_MAX) {

                fido_log_debug("%s: invalid offset=%zu", __func__, offset);

                return -1;

        }

        memset(buf, 0xff, 32);

        buf[32] = CTAP_CBOR_LARGEBLOB;

        buf[33] = 0x00;

        u32_offset = htole32((uint32_t)offset);

        memcpy(&buf[34], &u32_offset, sizeof(uint32_t));

        if (SHA256(data, len, &buf[38]) != &buf[38]) {

                fido_log_debug("%s: SHA256", __func__);

                return -1;

        }

        return fido_blob_set(hmac, buf, sizeof(buf));

}

static int

largeblob_set_tx(fido_dev_t *dev, const fido_blob_t *token, const u_char *chunk,

    size_t chunk_len, size_t offset, size_t totalsiz, int *ms)

{

        fido_blob_t *hmac = NULL, f;

        cbor_item_t *argv[6];

        int r;

        memset(argv, 0, sizeof(argv));

        memset(&f, 0, sizeof(f));

        if ((argv[1] = cbor_build_bytestring(chunk, chunk_len)) == NULL ||

            (argv[2] = cbor_build_uint(offset)) == NULL ||

            (offset == 0 && (argv[3] = cbor_build_uint(totalsiz)) == NULL)) {

                fido_log_debug("%s: cbor encode", __func__);

                r = FIDO_ERR_INTERNAL;

                goto fail;

        }

        if (token != NULL) {

                if ((hmac = fido_blob_new()) == NULL ||

                    prepare_hmac(offset, chunk, chunk_len, hmac) < 0 ||

                    (argv[4] = cbor_encode_pin_auth(dev, token, hmac)) == NULL ||

                    (argv[5] = cbor_encode_pin_opt(dev)) == NULL) {

                        fido_log_debug("%s: cbor_encode_pin_auth", __func__);

                        r = FIDO_ERR_INTERNAL;

                        goto fail;

                }

        }

        if (cbor_build_frame(CTAP_CBOR_LARGEBLOB, argv, nitems(argv), &f) < 0 ||

            fido_tx(dev, CTAP_CMD_CBOR, f.ptr, f.len, ms) < 0) {

                fido_log_debug("%s: fido_tx", __func__);

                r = FIDO_ERR_TX;

                goto fail;

        }

        r = FIDO_OK;

fail:

        cbor_vector_free(argv, nitems(argv));

        fido_blob_free(&hmac);

        free(f.ptr);

        return r;

}

static int

largeblob_get_uv_token(fido_dev_t *dev, const char *pin, fido_blob_t *token,

    int *ms)

{

        es256_pk_t *pk = NULL;

        fido_blob_t *ecdh = NULL;

        int r;

        if ((r = fido_do_ecdh(dev, &pk, &ecdh, ms)) != FIDO_OK) {

                fido_log_debug("%s: fido_do_ecdh", __func__);

                goto fail;

        }

        if ((r = fido_dev_get_uv_token(dev, CTAP_CBOR_LARGEBLOB, pin, ecdh, pk,

            NULL, token, ms)) != FIDO_OK) {

                fido_log_debug("%s: fido_dev_get_uv_token", __func__);

                goto fail;

        }

        r = FIDO_OK;

fail:

        if (r != FIDO_OK)

                fido_blob_reset(token);

        fido_blob_free(&ecdh);

        es256_pk_free(&pk);

        return r;

}

static int

largeblob_set_array(fido_dev_t *dev, const cbor_item_t *item, const char *pin,

    int *ms)

{

        unsigned char dgst[SHA256_DIGEST_LENGTH];

        fido_blob_t cbor, token_store;

        const fido_blob_t *token = NULL;

        size_t chunklen, maxchunklen, totalsize;

        int r;

        memset(&cbor, 0, sizeof(cbor));

        memset(&token_store, 0, sizeof(token_store));

        if ((maxchunklen = get_chunklen(dev)) == 0) {

                fido_log_debug("%s: maxchunklen=%zu", __func__, maxchunklen);

                r = FIDO_ERR_INVALID_ARGUMENT;

                goto fail;

        }

        if (!cbor_isa_array(item) || !cbor_array_is_definite(item)) {

                fido_log_debug("%s: cbor type", __func__);

                r = FIDO_ERR_INVALID_ARGUMENT;

                goto fail;

        }

        if ((fido_blob_serialise(&cbor, item)) < 0) {

                fido_log_debug("%s: fido_blob_serialise", __func__);

                r = FIDO_ERR_INTERNAL;

                goto fail;

        }

        if (cbor.len > SIZE_MAX - sizeof(dgst)) {

                fido_log_debug("%s: cbor.len=%zu", __func__, cbor.len);

                r = FIDO_ERR_INVALID_ARGUMENT;

                goto fail;

        }

        if (SHA256(cbor.ptr, cbor.len, dgst) != dgst) {

                fido_log_debug("%s: SHA256", __func__);

                r = FIDO_ERR_INTERNAL;

                goto fail;

        }

        totalsize = cbor.len + sizeof(dgst) - 16; /* the first 16 bytes only */

        if ((token = fido_dev_puat_blob(dev)) == NULL &&

            (pin != NULL || fido_dev_supports_permissions(dev))) {

                if ((r = largeblob_get_uv_token(dev, pin, &token_store,

                    ms)) != FIDO_OK) {

                        fido_log_debug("%s: largeblob_get_uv_token", __func__);

                        goto fail;

                }

                token = &token_store;

        }

        for (size_t offset = 0; offset < cbor.len; offset += chunklen) {

                if ((chunklen = cbor.len - offset) > maxchunklen)

                        chunklen = maxchunklen;

                if ((r = largeblob_set_tx(dev, token, cbor.ptr + offset,

                    chunklen, offset, totalsize, ms)) != FIDO_OK ||

                    (r = fido_rx_cbor_status(dev, ms)) != FIDO_OK) {

                        fido_log_debug("%s: body", __func__);

                        goto fail;

                }

        }

        if ((r = largeblob_set_tx(dev, token, dgst, sizeof(dgst) - 16, cbor.len,

            totalsize, ms)) != FIDO_OK ||

            (r = fido_rx_cbor_status(dev, ms)) != FIDO_OK) {

                fido_log_debug("%s: dgst", __func__);

                goto fail;

        }

        r = FIDO_OK;

fail:

        fido_blob_reset(&token_store);

        fido_blob_reset(&cbor);

        return r;

}

static int

largeblob_add(fido_dev_t *dev, const fido_blob_t *key, cbor_item_t *item,

    const char *pin, int *ms)

{

        cbor_item_t *array = NULL;

        size_t idx;

        int r;

        if ((r = largeblob_get_array(dev, &array, ms)) != FIDO_OK) {

                fido_log_debug("%s: largeblob_get_array", __func__);

                goto fail;

        }

        switch (r = largeblob_array_lookup(NULL, &idx, array, key)) {

        case FIDO_OK:

                if (!cbor_array_replace(array, idx, item)) {

                        r = FIDO_ERR_INTERNAL;

                        goto fail;

                }

                break;

        case FIDO_ERR_NOTFOUND:

                if (cbor_array_append(&array, item) < 0) {

                        r = FIDO_ERR_INTERNAL;

                        goto fail;

                }

                break;

        default:

                fido_log_debug("%s: largeblob_array_lookup", __func__);

                goto fail;

        }

        if ((r = largeblob_set_array(dev, array, pin, ms)) != FIDO_OK) {

                fido_log_debug("%s: largeblob_set_array", __func__);

                goto fail;

        }

        r = FIDO_OK;

fail:

        if (array != NULL)

                cbor_decref(&array);

        return r;

}

static int

largeblob_drop(fido_dev_t *dev, const fido_blob_t *key, const char *pin,

    int *ms)

{

        cbor_item_t *array = NULL;

        size_t idx;

        int r;

        if ((r = largeblob_get_array(dev, &array, ms)) != FIDO_OK) {

                fido_log_debug("%s: largeblob_get_array", __func__);

                goto fail;

        }

        if ((r = largeblob_array_lookup(NULL, &idx, array, key)) != FIDO_OK) {

                fido_log_debug("%s: largeblob_array_lookup", __func__);

                goto fail;

        }

        if (cbor_array_drop(&array, idx) < 0) {

                fido_log_debug("%s: cbor_array_drop", __func__);

                r = FIDO_ERR_INTERNAL;

                goto fail;

        }

        if ((r = largeblob_set_array(dev, array, pin, ms)) != FIDO_OK) {

                fido_log_debug("%s: largeblob_set_array", __func__);

                goto fail;

        }

        r = FIDO_OK;

fail:

        if (array != NULL)

                cbor_decref(&array);

        return r;

}

int

fido_dev_largeblob_get(fido_dev_t *dev, const unsigned char *key_ptr,

    size_t key_len, unsigned char **blob_ptr, size_t *blob_len)

{

        cbor_item_t *item = NULL;

        fido_blob_t key, body;

        int ms = dev->timeout_ms;

        int r;

        memset(&key, 0, sizeof(key));

        memset(&body, 0, sizeof(body));

        if (key_len != 32) {

                fido_log_debug("%s: invalid key len %zu", __func__, key_len);

                return FIDO_ERR_INVALID_ARGUMENT;

        }

        if (blob_ptr == NULL || blob_len == NULL) {

                fido_log_debug("%s: invalid blob_ptr=%p, blob_len=%p", __func__,

                    (const void *)blob_ptr, (const void *)blob_len);

                return FIDO_ERR_INVALID_ARGUMENT;

        }

        *blob_ptr = NULL;

        *blob_len = 0;

        if (fido_blob_set(&key, key_ptr, key_len) < 0) {

                fido_log_debug("%s: fido_blob_set", __func__);

                return FIDO_ERR_INTERNAL;

        }

        if ((r = largeblob_get_array(dev, &item, &ms)) != FIDO_OK) {

                fido_log_debug("%s: largeblob_get_array", __func__);

                goto fail;

        }

        if ((r = largeblob_array_lookup(&body, NULL, item, &key)) != FIDO_OK)

                fido_log_debug("%s: largeblob_array_lookup", __func__);

        else {

                *blob_ptr = body.ptr;

                *blob_len = body.len;

        }

fail:

        if (item != NULL)

                cbor_decref(&item);

        fido_blob_reset(&key);

        return r;

}

int

fido_dev_largeblob_set(fido_dev_t *dev, const unsigned char *key_ptr,

    size_t key_len, const unsigned char *blob_ptr, size_t blob_len,

    const char *pin)

{

        cbor_item_t *item = NULL;

        fido_blob_t key, body;

        int ms = dev->timeout_ms;

        int r;

        memset(&key, 0, sizeof(key));

        memset(&body, 0, sizeof(body));

        if (key_len != 32) {

                fido_log_debug("%s: invalid key len %zu", __func__, key_len);

                return FIDO_ERR_INVALID_ARGUMENT;

        }

        if (blob_ptr == NULL || blob_len == 0) {

                fido_log_debug("%s: invalid blob_ptr=%p, blob_len=%zu", __func__,

                    (const void *)blob_ptr, blob_len);

                return FIDO_ERR_INVALID_ARGUMENT;

        }

        if (fido_blob_set(&key, key_ptr, key_len) < 0 ||

            fido_blob_set(&body, blob_ptr, blob_len) < 0) {

                fido_log_debug("%s: fido_blob_set", __func__);

                r = FIDO_ERR_INTERNAL;

                goto fail;

        }

        if ((item = largeblob_encode(&body, &key)) == NULL) {

                fido_log_debug("%s: largeblob_encode", __func__);

                r = FIDO_ERR_INTERNAL;

                goto fail;

        }

        if ((r = largeblob_add(dev, &key, item, pin, &ms)) != FIDO_OK)

                fido_log_debug("%s: largeblob_add", __func__);

fail:

        if (item != NULL)

                cbor_decref(&item);

        fido_blob_reset(&key);

        fido_blob_reset(&body);

        return r;

}

int

fido_dev_largeblob_remove(fido_dev_t *dev, const unsigned char *key_ptr,

    size_t key_len, const char *pin)

{

        fido_blob_t key;

        int ms = dev->timeout_ms;

        int r;

        memset(&key, 0, sizeof(key));

        if (key_len != 32) {

                fido_log_debug("%s: invalid key len %zu", __func__, key_len);

                return FIDO_ERR_INVALID_ARGUMENT;

        }

        if (fido_blob_set(&key, key_ptr, key_len) < 0) {

                fido_log_debug("%s: fido_blob_set", __func__);

                return FIDO_ERR_INTERNAL;

        }

        if ((r = largeblob_drop(dev, &key, pin, &ms)) != FIDO_OK)

                fido_log_debug("%s: largeblob_drop", __func__);

        fido_blob_reset(&key);

        return r;

}

int

fido_dev_largeblob_get_array(fido_dev_t *dev, unsigned char **cbor_ptr,

    size_t *cbor_len)

{

        cbor_item_t *item = NULL;

        fido_blob_t cbor;

        int ms = dev->timeout_ms;

        int r;

        memset(&cbor, 0, sizeof(cbor));

        if (cbor_ptr == NULL || cbor_len == NULL) {

                fido_log_debug("%s: invalid cbor_ptr=%p, cbor_len=%p", __func__,

                    (const void *)cbor_ptr, (const void *)cbor_len);

                return FIDO_ERR_INVALID_ARGUMENT;

        }

        *cbor_ptr = NULL;

        *cbor_len = 0;

        if ((r = largeblob_get_array(dev, &item, &ms)) != FIDO_OK) {

                fido_log_debug("%s: largeblob_get_array", __func__);

                return r;

        }

        if (fido_blob_serialise(&cbor, item) < 0) {

                fido_log_debug("%s: fido_blob_serialise", __func__);

                r = FIDO_ERR_INTERNAL;

        } else {

                *cbor_ptr = cbor.ptr;

                *cbor_len = cbor.len;

        }

        cbor_decref(&item);

        return r;

}

int

fido_dev_largeblob_set_array(fido_dev_t *dev, const unsigned char *cbor_ptr,

    size_t cbor_len, const char *pin)

{

        cbor_item_t *item = NULL;

        struct cbor_load_result cbor_result;

        int ms = dev->timeout_ms;

        int r;

        if (cbor_ptr == NULL || cbor_len == 0) {

                fido_log_debug("%s: invalid cbor_ptr=%p, cbor_len=%zu", __func__,

                    (const void *)cbor_ptr, cbor_len);

                return FIDO_ERR_INVALID_ARGUMENT;

        }

        if ((item = cbor_load(cbor_ptr, cbor_len, &cbor_result)) == NULL) {

                fido_log_debug("%s: cbor_load", __func__);

                return FIDO_ERR_INVALID_ARGUMENT;

        }

        if ((r = largeblob_set_array(dev, item, pin, &ms)) != FIDO_OK)

                fido_log_debug("%s: largeblob_set_array", __func__);

        cbor_decref(&item);

        return r;

}