int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs,
                        X509_STORE *store, unsigned long flags)
{
    X509 *signer;
    X509_NAME *nm;
    GENERAL_NAME *gen;
    int ret = 0;
    X509_STORE_CTX *ctx = X509_STORE_CTX_new();
    if (ctx == NULL) {
        OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_MALLOC_FAILURE);
        goto err;
    }
    if (!req->optionalSignature) {
        OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);
        goto err;
    }
    gen = req->tbsRequest.requestorName;
    if (!gen || gen->type != GEN_DIRNAME) {
        OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
                OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);
        goto err;
    }
    nm = gen->d.directoryName;
    ret = ocsp_req_find_signer(&signer, req, nm, certs, flags);
    if (ret <= 0) {
        OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
                OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);
        goto err;
    }
    if ((ret == 2) && (flags & OCSP_TRUSTOTHER))
        flags |= OCSP_NOVERIFY;
    if (!(flags & OCSP_NOSIGS)) {
        EVP_PKEY *skey;
        skey = X509_get0_pubkey(signer);
        ret = OCSP_REQUEST_verify(req, skey);
        if (ret <= 0) {
            OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);
            goto err;
        }
    }
    if (!(flags & OCSP_NOVERIFY)) {
        int init_res;
        if (flags & OCSP_NOCHAIN)
            init_res = X509_STORE_CTX_init(ctx, store, signer, NULL);
        else
            init_res = X509_STORE_CTX_init(ctx, store, signer,
                                           req->optionalSignature->certs);
        if (!init_res) {
            OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB);
            goto err;
        }
        X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_OCSP_HELPER);
        X509_STORE_CTX_set_trust(ctx, X509_TRUST_OCSP_REQUEST);
        ret = X509_verify_cert(ctx);
        if (ret <= 0) {
            ret = X509_STORE_CTX_get_error(ctx);
            OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,
                    OCSP_R_CERTIFICATE_VERIFY_ERROR);
            ERR_add_error_data(2, "Verify error:",
                               X509_verify_cert_error_string(ret));
            goto err;
        }
    }
    ret = 1;
    goto end;
err:
    ret = 0;
end:
    X509_STORE_CTX_free(ctx);
    return ret;
}
['int OCSP_request_verify(OCSP_REQUEST *req, STACK_OF(X509) *certs,\n                        X509_STORE *store, unsigned long flags)\n{\n    X509 *signer;\n    X509_NAME *nm;\n    GENERAL_NAME *gen;\n    int ret = 0;\n    X509_STORE_CTX *ctx = X509_STORE_CTX_new();\n    if (ctx == NULL) {\n        OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_MALLOC_FAILURE);\n        goto err;\n    }\n    if (!req->optionalSignature) {\n        OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_REQUEST_NOT_SIGNED);\n        goto err;\n    }\n    gen = req->tbsRequest.requestorName;\n    if (!gen || gen->type != GEN_DIRNAME) {\n        OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,\n                OCSP_R_UNSUPPORTED_REQUESTORNAME_TYPE);\n        goto err;\n    }\n    nm = gen->d.directoryName;\n    ret = ocsp_req_find_signer(&signer, req, nm, certs, flags);\n    if (ret <= 0) {\n        OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,\n                OCSP_R_SIGNER_CERTIFICATE_NOT_FOUND);\n        goto err;\n    }\n    if ((ret == 2) && (flags & OCSP_TRUSTOTHER))\n        flags |= OCSP_NOVERIFY;\n    if (!(flags & OCSP_NOSIGS)) {\n        EVP_PKEY *skey;\n        skey = X509_get0_pubkey(signer);\n        ret = OCSP_REQUEST_verify(req, skey);\n        if (ret <= 0) {\n            OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, OCSP_R_SIGNATURE_FAILURE);\n            goto err;\n        }\n    }\n    if (!(flags & OCSP_NOVERIFY)) {\n        int init_res;\n        if (flags & OCSP_NOCHAIN)\n            init_res = X509_STORE_CTX_init(ctx, store, signer, NULL);\n        else\n            init_res = X509_STORE_CTX_init(ctx, store, signer,\n                                           req->optionalSignature->certs);\n        if (!init_res) {\n            OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY, ERR_R_X509_LIB);\n            goto err;\n        }\n        X509_STORE_CTX_set_purpose(ctx, X509_PURPOSE_OCSP_HELPER);\n        X509_STORE_CTX_set_trust(ctx, X509_TRUST_OCSP_REQUEST);\n        ret = X509_verify_cert(ctx);\n        if (ret <= 0) {\n            ret = X509_STORE_CTX_get_error(ctx);\n            OCSPerr(OCSP_F_OCSP_REQUEST_VERIFY,\n                    OCSP_R_CERTIFICATE_VERIFY_ERROR);\n            ERR_add_error_data(2, "Verify error:",\n                               X509_verify_cert_error_string(ret));\n            goto err;\n        }\n    }\n    ret = 1;\n    goto end;\nerr:\n    ret = 0;\nend:\n    X509_STORE_CTX_free(ctx);\n    return ret;\n}', 'X509_STORE_CTX *X509_STORE_CTX_new(void)\n{\n    X509_STORE_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));\n    if (ctx == NULL) {\n        X509err(X509_F_X509_STORE_CTX_NEW, ERR_R_MALLOC_FAILURE);\n        return NULL;\n    }\n    return ctx;\n}', 'void *CRYPTO_zalloc(size_t num, const char *file, int line)\n{\n    void *ret = CRYPTO_malloc(num, file, line);\n    if (ret != NULL)\n        memset(ret, 0, num);\n    return ret;\n}', 'void *CRYPTO_malloc(size_t num, const char *file, int line)\n{\n    void *ret = NULL;\n    if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)\n        return malloc_impl(num, file, line);\n    if (num <= 0)\n        return NULL;\n    allow_customize = 0;\n#ifndef OPENSSL_NO_CRYPTO_MDEBUG\n    if (call_malloc_debug) {\n        CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);\n        ret = malloc(num);\n        CRYPTO_mem_debug_malloc(ret, num, 1, file, line);\n    } else {\n        ret = malloc(num);\n    }\n#else\n    osslargused(file); osslargused(line);\n    ret = malloc(num);\n#endif\n    return ret;\n}', 'void X509_STORE_CTX_free(X509_STORE_CTX *ctx)\n{\n    if (ctx == NULL)\n        return;\n    X509_STORE_CTX_cleanup(ctx);\n    OPENSSL_free(ctx);\n}', 'void CRYPTO_free(void *str, const char *file, int line)\n{\n    if (free_impl != NULL && free_impl != &CRYPTO_free) {\n        free_impl(str, file, line);\n        return;\n    }\n#ifndef OPENSSL_NO_CRYPTO_MDEBUG\n    if (call_malloc_debug) {\n        CRYPTO_mem_debug_free(str, 0, file, line);\n        free(str);\n        CRYPTO_mem_debug_free(str, 1, file, line);\n    } else {\n        free(str);\n    }\n#else\n    free(str);\n#endif\n}']