/*
 * Copyright 1995-2026 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include "crypto/asn1.h"

int ASN1_TYPE_set_octetstring(ASN1_TYPE *a, unsigned char *data, int len)
{
    ASN1_STRING *os;

    if ((os = ASN1_OCTET_STRING_new()) == NULL)
        return 0;
    if (!ASN1_OCTET_STRING_set(os, data, len)) {
        ASN1_OCTET_STRING_free(os);
        return 0;
    }
    ASN1_TYPE_set(a, V_ASN1_OCTET_STRING, os);
    return 1;
}

/* int max_len:  for returned value
 * if passing NULL in data, nothing is copied but the necessary length
 * for it is returned.
 */
int ASN1_TYPE_get_octetstring(const ASN1_TYPE *a, unsigned char *data, int max_len)
{
    int ret, num;
    const unsigned char *p;

    if ((a->type != V_ASN1_OCTET_STRING) || (a->value.octet_string == NULL)) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_DATA_IS_WRONG);
        return -1;
    }
    p = ASN1_STRING_get0_data(a->value.octet_string);
    ret = ASN1_STRING_length(a->value.octet_string);
    if (ret < max_len)
        num = ret;
    else
        num = max_len;
    if (num > 0 && data != NULL)
        memcpy(data, p, num);
    return ret;
}

static ossl_inline void asn1_type_init_oct(ASN1_OCTET_STRING *oct,
    unsigned char *data, int len)
{
    oct->data = data;
    oct->type = V_ASN1_OCTET_STRING;
    oct->length = len;
    oct->flags = 0;
}

/*
 * This function copies 'anum' to 'num' and the data of 'oct' to 'data'.
 * If the length of 'data' > 'max_len', copies only the first 'max_len'
 * bytes, but returns the full length of 'oct'; this allows distinguishing
 * whether all the data was copied.
 */
static int asn1_type_get_int_oct(ASN1_OCTET_STRING *oct, int32_t anum,
    long *num, unsigned char *data, int max_len)
{
    int ret = ASN1_STRING_length(oct), n;

    if (num != NULL)
        *num = anum;

    if (max_len > ret)
        n = ret;
    else
        n = max_len;

    if (data != NULL)
        memcpy(data, ASN1_STRING_get0_data(oct), n);

    return ret;
}

typedef struct {
    int32_t num;
    ASN1_OCTET_STRING *oct;
} asn1_int_oct;

ASN1_SEQUENCE(asn1_int_oct) = {
    ASN1_EMBED(asn1_int_oct, num, INT32),
    ASN1_SIMPLE(asn1_int_oct, oct, ASN1_OCTET_STRING)
} static_ASN1_SEQUENCE_END(asn1_int_oct)

    DECLARE_ASN1_ITEM(asn1_int_oct)

int ASN1_TYPE_set_int_octetstring(ASN1_TYPE *a, long num, unsigned char *data,
    int len)
{
    asn1_int_oct atmp;
    ASN1_OCTET_STRING oct;

    atmp.num = num;
    atmp.oct = &oct;
    asn1_type_init_oct(&oct, data, len);

    if (ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(asn1_int_oct), &atmp, &a))
        return 1;
    return 0;
}

/*
 * This function decodes an int-octet sequence and copies the integer to 'num'
 * and the data of octet to 'data'.
 * If the length of 'data' > 'max_len', copies only the first 'max_len'
 * bytes, but returns the full length of 'oct'; this allows distinguishing
 * whether all the data was copied.
 */
int ASN1_TYPE_get_int_octetstring(const ASN1_TYPE *a, long *num,
    unsigned char *data, int max_len)
{
    asn1_int_oct *atmp = NULL;
    int ret = -1;

    if ((a->type != V_ASN1_SEQUENCE) || (a->value.sequence == NULL)) {
        goto err;
    }

    atmp = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(asn1_int_oct), a);

    if (atmp == NULL)
        goto err;

    ret = asn1_type_get_int_oct(atmp->oct, atmp->num, num, data, max_len);

    if (ret == -1) {
    err:
        ERR_raise(ERR_LIB_ASN1, ASN1_R_DATA_IS_WRONG);
    }
    M_ASN1_free_of(atmp, asn1_int_oct);
    return ret;
}

typedef struct {
    ASN1_OCTET_STRING *oct;
    int32_t num;
} asn1_oct_int;

/*
 * Defined in RFC 5084 -
 * Section 2. "Content-Authenticated Encryption Algorithms"
 */
ASN1_SEQUENCE(asn1_oct_int) = {
    ASN1_SIMPLE(asn1_oct_int, oct, ASN1_OCTET_STRING),
    ASN1_EMBED(asn1_oct_int, num, INT32)
} static_ASN1_SEQUENCE_END(asn1_oct_int)

    DECLARE_ASN1_ITEM(asn1_oct_int)

int ossl_asn1_type_set_octetstring_int(ASN1_TYPE *a, long num,
    unsigned char *data, int len)
{
    asn1_oct_int atmp;
    ASN1_OCTET_STRING oct;

    atmp.num = num;
    atmp.oct = &oct;
    asn1_type_init_oct(&oct, data, len);

    if (ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(asn1_oct_int), &atmp, &a))
        return 1;
    return 0;
}

/*
 * This function decodes an octet-int sequence and copies the data of octet
 * to 'data' and the integer to 'num'.
 * If the length of 'data' > 'max_len', copies only the first 'max_len'
 * bytes, but returns the full length of 'oct'; this allows distinguishing
 * whether all the data was copied.
 */
int ossl_asn1_type_get_octetstring_int(const ASN1_TYPE *a, long *num,
    unsigned char *data, int max_len)
{
    asn1_oct_int *atmp = NULL;
    int ret = -1;

    if ((a->type != V_ASN1_SEQUENCE) || (a->value.sequence == NULL))
        goto err;

    atmp = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(asn1_oct_int), a);

    if (atmp == NULL)
        goto err;

    ret = asn1_type_get_int_oct(atmp->oct, atmp->num, num, data, max_len);

    if (ret == -1) {
    err:
        ERR_raise(ERR_LIB_ASN1, ASN1_R_DATA_IS_WRONG);
    }
    M_ASN1_free_of(atmp, asn1_oct_int);
    return ret;
}
