/*

 * Copyright 1999-2026 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 <stdlib.h>

#include <openssl/bio.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/pem.h>

#include <openssl/pkcs7.h>

#include <openssl/x509.h>

#include <openssl/err.h>

#include <crypto/asn1.h>

int PKCS7_add_attrib_smimecap(PKCS7_SIGNER_INFO *si,

    STACK_OF(X509_ALGOR) *cap)

{

    ASN1_STRING *seq;

    if ((seq = ASN1_STRING_new()) == NULL) {

        ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);

        return 0;

    }

    seq->length = ASN1_item_i2d((ASN1_VALUE *)cap, &seq->data,

        ASN1_ITEM_rptr(X509_ALGORS));

    if (ASN1_STRING_length_ex(seq) == 0 || ASN1_STRING_get0_data(seq) == NULL) {

        ASN1_STRING_free(seq);

        return 1;

    }

    if (!PKCS7_add_signed_attribute(si, NID_SMIMECapabilities,

            V_ASN1_SEQUENCE, seq)) {

        ASN1_STRING_free(seq);

        return 0;

    }

    return 1;

}

STACK_OF(X509_ALGOR) *PKCS7_get_smimecap(PKCS7_SIGNER_INFO *si)

{

    const ASN1_TYPE *cap;

    const unsigned char *p;

    size_t len;

    cap = PKCS7_get_signed_attribute(si, NID_SMIMECapabilities);

    if (cap == NULL || (cap->type != V_ASN1_SEQUENCE))

        return NULL;

    p = ASN1_STRING_get0_data(cap->value.sequence);

    len = ASN1_STRING_length_ex(cap->value.sequence);

    if (len > INT_MAX)

        return NULL;

    return (STACK_OF(X509_ALGOR) *)

        ASN1_item_d2i(NULL, &p, (int)len, ASN1_ITEM_rptr(X509_ALGORS));

}

/* Basic smime-capabilities OID and optional integer arg */

int PKCS7_simple_smimecap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)

{

    ASN1_INTEGER *nbit = NULL;

    X509_ALGOR *alg;

    if ((alg = X509_ALGOR_new()) == NULL) {

        ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);

        return 0;

    }

    ASN1_OBJECT_free(alg->algorithm);

    alg->algorithm = OBJ_nid2obj(nid);

    if (arg > 0) {

        if ((alg->parameter = ASN1_TYPE_new()) == NULL) {

            ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);

            goto err;

        }

        if ((nbit = ASN1_INTEGER_new()) == NULL) {

            ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);

            goto err;

        }

        if (!ASN1_INTEGER_set(nbit, arg)) {

            ERR_raise(ERR_LIB_PKCS7, ERR_R_ASN1_LIB);

            goto err;

        }

        alg->parameter->value.integer = nbit;

        alg->parameter->type = V_ASN1_INTEGER;

        nbit = NULL;

    }

    if (!sk_X509_ALGOR_push(sk, alg)) {

        ERR_raise(ERR_LIB_PKCS7, ERR_R_CRYPTO_LIB);

        goto err;

    }

    return 1;

err:

    ASN1_INTEGER_free(nbit);

    X509_ALGOR_free(alg);

    return 0;

}

int PKCS7_add_attrib_content_type(PKCS7_SIGNER_INFO *si, ASN1_OBJECT *coid)

{

    if (PKCS7_get_signed_attribute(si, NID_pkcs9_contentType))

        return 0;

    if (!coid)

        coid = OBJ_nid2obj(NID_pkcs7_data);

    return PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,

        V_ASN1_OBJECT, coid);

}

int PKCS7_add0_attrib_signing_time(PKCS7_SIGNER_INFO *si, ASN1_TIME *t)

{

    ASN1_TIME *tmp = NULL;

    if (t == NULL && (tmp = t = X509_gmtime_adj(NULL, 0)) == NULL) {

        ERR_raise(ERR_LIB_PKCS7, ERR_R_X509_LIB);

        return 0;

    }

    if (!PKCS7_add_signed_attribute(si, NID_pkcs9_signingTime,

            V_ASN1_UTCTIME, t)) {

        ASN1_TIME_free(tmp);

        return 0;

    }

    return 1;

}

int PKCS7_add1_attrib_digest(PKCS7_SIGNER_INFO *si,

    const unsigned char *md, int mdlen)

{

    ASN1_OCTET_STRING *os;

    os = ASN1_OCTET_STRING_new();

    if (os == NULL)

        return 0;

    if (!ASN1_STRING_set_data(os, md, mdlen)

        || !PKCS7_add_signed_attribute(si, NID_pkcs9_messageDigest,

            V_ASN1_OCTET_STRING, os)) {

        ASN1_OCTET_STRING_free(os);

        return 0;

    }

    return 1;

}