/*

 * Copyright 2000-2021 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/objects.h>

#include <openssl/x509.h>

#include <openssl/pem.h>

#include <openssl/x509v3.h>

#include <openssl/ocsp.h>

#include "ocsp_local.h"

#include <openssl/asn1t.h>

/* Convert a certificate and its issuer to an OCSP_CERTID */

OCSP_CERTID *OCSP_cert_to_id(const EVP_MD *dgst, const X509 *subject,

                             const X509 *issuer)

{

    const X509_NAME *iname;

    const ASN1_INTEGER *serial;

    ASN1_BIT_STRING *ikey;

    if (!dgst)

        dgst = EVP_sha1();

    if (subject) {

        iname = X509_get_issuer_name(subject);

        serial = X509_get0_serialNumber(subject);

    } else {

        iname = X509_get_subject_name(issuer);

        serial = NULL;

    }

    ikey = X509_get0_pubkey_bitstr(issuer);

    return OCSP_cert_id_new(dgst, iname, ikey, serial);

}

OCSP_CERTID *OCSP_cert_id_new(const EVP_MD *dgst,

                              const X509_NAME *issuerName,

                              const ASN1_BIT_STRING *issuerKey,

                              const ASN1_INTEGER *serialNumber)

{

    int nid;

    unsigned int i;

    X509_ALGOR *alg;

    OCSP_CERTID *cid = NULL;

    unsigned char md[EVP_MAX_MD_SIZE];

    if ((cid = OCSP_CERTID_new()) == NULL)

        goto err;

    alg = &cid->hashAlgorithm;

    ASN1_OBJECT_free(alg->algorithm);

    if ((nid = EVP_MD_get_type(dgst)) == NID_undef) {

        ERR_raise(ERR_LIB_OCSP, OCSP_R_UNKNOWN_NID);

        goto err;

    }

    if ((alg->algorithm = OBJ_nid2obj(nid)) == NULL)

        goto err;

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

        goto err;

    alg->parameter->type = V_ASN1_NULL;

    if (!X509_NAME_digest(issuerName, dgst, md, &i))

        goto digerr;

    if (!(ASN1_OCTET_STRING_set(&cid->issuerNameHash, md, i)))

        goto err;

    /* Calculate the issuerKey hash, excluding tag and length */

    if (!EVP_Digest(issuerKey->data, issuerKey->length, md, &i, dgst, NULL))

        goto err;

    if (!(ASN1_OCTET_STRING_set(&cid->issuerKeyHash, md, i)))

        goto err;

    if (serialNumber) {

        if (ASN1_STRING_copy(&cid->serialNumber, serialNumber) == 0)

            goto err;

    }

    return cid;

 digerr:

    ERR_raise(ERR_LIB_OCSP, OCSP_R_DIGEST_ERR);

 err:

    OCSP_CERTID_free(cid);

    return NULL;

}

int OCSP_id_issuer_cmp(const OCSP_CERTID *a, const OCSP_CERTID *b)

{

    int ret;

    ret = OBJ_cmp(a->hashAlgorithm.algorithm, b->hashAlgorithm.algorithm);

    if (ret)

        return ret;

    ret = ASN1_OCTET_STRING_cmp(&a->issuerNameHash, &b->issuerNameHash);

    if (ret)

        return ret;

    return ASN1_OCTET_STRING_cmp(&a->issuerKeyHash, &b->issuerKeyHash);

}

int OCSP_id_cmp(const OCSP_CERTID *a, const OCSP_CERTID *b)

{

    int ret;

    ret = OCSP_id_issuer_cmp(a, b);

    if (ret)

        return ret;

    return ASN1_INTEGER_cmp(&a->serialNumber, &b->serialNumber);

}

IMPLEMENT_ASN1_DUP_FUNCTION(OCSP_CERTID)