MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
{
    EVP_PKEY *pkey = NULL;
    const unsigned char *data;
#ifndef OPENSSL_NO_GOST
    unsigned char *gost_data = NULL;
#endif
    int al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR;
    int type = 0, j, pktype;
    unsigned int len;
    X509 *peer;
    const EVP_MD *md = NULL;
    size_t hdatalen = 0;
    void *hdata;
    unsigned char tls13tbs[TLS13_TBS_PREAMBLE_SIZE + EVP_MAX_MD_SIZE];
    EVP_MD_CTX *mctx = EVP_MD_CTX_new();
    EVP_PKEY_CTX *pctx = NULL;
    if (mctx == NULL) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
        goto f_err;
    }
    peer = s->session->peer;
    pkey = X509_get0_pubkey(peer);
    pktype = EVP_PKEY_id(pkey);
    type = X509_certificate_type(peer, pkey);
    if (!(type & EVP_PKT_SIGN)) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY,
               SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
        al = SSL_AD_ILLEGAL_PARAMETER;
        goto f_err;
    }
#ifndef OPENSSL_NO_GOST
    if (PACKET_remaining(pkt) == 64
        && EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) {
        len = 64;
    } else
#endif
    {
        if (SSL_USE_SIGALGS(s)) {
            int rv;
            unsigned int sigalg;
            if (!PACKET_get_net_2(pkt, &sigalg)) {
                al = SSL_AD_DECODE_ERROR;
                goto f_err;
            }
            rv = tls12_check_peer_sigalg(&md, s, sigalg, pkey);
            if (rv == -1) {
                goto f_err;
            } else if (rv == 0) {
                al = SSL_AD_DECODE_ERROR;
                goto f_err;
            }
#ifdef SSL_DEBUG
            fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
#endif
        } else {
            int idx = ssl_cert_type(NULL, pkey);
            if (idx >= 0)
                md = s->s3->tmp.md[idx];
            if (md == NULL) {
                al = SSL_AD_INTERNAL_ERROR;
                goto f_err;
            }
        }
        if (!PACKET_get_net_2(pkt, &len)) {
            SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
            al = SSL_AD_DECODE_ERROR;
            goto f_err;
        }
    }
    j = EVP_PKEY_size(pkey);
    if (((int)len > j) || ((int)PACKET_remaining(pkt) > j)
        || (PACKET_remaining(pkt) == 0)) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE);
        al = SSL_AD_DECODE_ERROR;
        goto f_err;
    }
    if (!PACKET_get_bytes(pkt, &data, len)) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
        al = SSL_AD_DECODE_ERROR;
        goto f_err;
    }
    if (!get_cert_verify_tbs_data(s, tls13tbs, &hdata, &hdatalen)) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
        goto f_err;
    }
#ifdef SSL_DEBUG
    fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md));
#endif
    if (EVP_DigestVerifyInit(mctx, &pctx, md, NULL, pkey) <= 0
            || EVP_DigestVerifyUpdate(mctx, hdata, hdatalen) <= 0) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
        goto f_err;
    }
#ifndef OPENSSL_NO_GOST
    {
        if (pktype == NID_id_GostR3410_2001
            || pktype == NID_id_GostR3410_2012_256
            || pktype == NID_id_GostR3410_2012_512) {
            if ((gost_data = OPENSSL_malloc(len)) == NULL) {
                SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
                goto f_err;
            }
            BUF_reverse(gost_data, data, len);
            data = gost_data;
        }
    }
#endif
    if (SSL_IS_TLS13(s) && pktype == EVP_PKEY_RSA) {
        if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0
                || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1) <= 0) {
            SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
            goto f_err;
        }
    } else if (s->version == SSL3_VERSION
        && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,
                            (int)s->session->master_key_length,
                            s->session->master_key)) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
        goto f_err;
    }
    if (EVP_DigestVerifyFinal(mctx, data, len) <= 0) {
        al = SSL_AD_DECRYPT_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE);
        goto f_err;
    }
    if (SSL_IS_TLS13(s))
        ret = MSG_PROCESS_CONTINUE_READING;
    else
        ret = MSG_PROCESS_CONTINUE_PROCESSING;
    if (0) {
 f_err:
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        ossl_statem_set_error(s);
    }
    BIO_free(s->s3->handshake_buffer);
    s->s3->handshake_buffer = NULL;
    EVP_MD_CTX_free(mctx);
#ifndef OPENSSL_NO_GOST
    OPENSSL_free(gost_data);
#endif
    return ret;
}
['MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)\n{\n    EVP_PKEY *pkey = NULL;\n    const unsigned char *data;\n#ifndef OPENSSL_NO_GOST\n    unsigned char *gost_data = NULL;\n#endif\n    int al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR;\n    int type = 0, j, pktype;\n    unsigned int len;\n    X509 *peer;\n    const EVP_MD *md = NULL;\n    size_t hdatalen = 0;\n    void *hdata;\n    unsigned char tls13tbs[TLS13_TBS_PREAMBLE_SIZE + EVP_MAX_MD_SIZE];\n    EVP_MD_CTX *mctx = EVP_MD_CTX_new();\n    EVP_PKEY_CTX *pctx = NULL;\n    if (mctx == NULL) {\n        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);\n        goto f_err;\n    }\n    peer = s->session->peer;\n    pkey = X509_get0_pubkey(peer);\n    pktype = EVP_PKEY_id(pkey);\n    type = X509_certificate_type(peer, pkey);\n    if (!(type & EVP_PKT_SIGN)) {\n        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY,\n               SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);\n        al = SSL_AD_ILLEGAL_PARAMETER;\n        goto f_err;\n    }\n#ifndef OPENSSL_NO_GOST\n    if (PACKET_remaining(pkt) == 64\n        && EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) {\n        len = 64;\n    } else\n#endif\n    {\n        if (SSL_USE_SIGALGS(s)) {\n            int rv;\n            unsigned int sigalg;\n            if (!PACKET_get_net_2(pkt, &sigalg)) {\n                al = SSL_AD_DECODE_ERROR;\n                goto f_err;\n            }\n            rv = tls12_check_peer_sigalg(&md, s, sigalg, pkey);\n            if (rv == -1) {\n                goto f_err;\n            } else if (rv == 0) {\n                al = SSL_AD_DECODE_ERROR;\n                goto f_err;\n            }\n#ifdef SSL_DEBUG\n            fprintf(stderr, "USING TLSv1.2 HASH %s\\n", EVP_MD_name(md));\n#endif\n        } else {\n            int idx = ssl_cert_type(NULL, pkey);\n            if (idx >= 0)\n                md = s->s3->tmp.md[idx];\n            if (md == NULL) {\n                al = SSL_AD_INTERNAL_ERROR;\n                goto f_err;\n            }\n        }\n        if (!PACKET_get_net_2(pkt, &len)) {\n            SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);\n            al = SSL_AD_DECODE_ERROR;\n            goto f_err;\n        }\n    }\n    j = EVP_PKEY_size(pkey);\n    if (((int)len > j) || ((int)PACKET_remaining(pkt) > j)\n        || (PACKET_remaining(pkt) == 0)) {\n        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE);\n        al = SSL_AD_DECODE_ERROR;\n        goto f_err;\n    }\n    if (!PACKET_get_bytes(pkt, &data, len)) {\n        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);\n        al = SSL_AD_DECODE_ERROR;\n        goto f_err;\n    }\n    if (!get_cert_verify_tbs_data(s, tls13tbs, &hdata, &hdatalen)) {\n        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);\n        goto f_err;\n    }\n#ifdef SSL_DEBUG\n    fprintf(stderr, "Using client verify alg %s\\n", EVP_MD_name(md));\n#endif\n    if (EVP_DigestVerifyInit(mctx, &pctx, md, NULL, pkey) <= 0\n            || EVP_DigestVerifyUpdate(mctx, hdata, hdatalen) <= 0) {\n        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);\n        goto f_err;\n    }\n#ifndef OPENSSL_NO_GOST\n    {\n        if (pktype == NID_id_GostR3410_2001\n            || pktype == NID_id_GostR3410_2012_256\n            || pktype == NID_id_GostR3410_2012_512) {\n            if ((gost_data = OPENSSL_malloc(len)) == NULL) {\n                SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);\n                goto f_err;\n            }\n            BUF_reverse(gost_data, data, len);\n            data = gost_data;\n        }\n    }\n#endif\n    if (SSL_IS_TLS13(s) && pktype == EVP_PKEY_RSA) {\n        if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0\n                || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1) <= 0) {\n            SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);\n            goto f_err;\n        }\n    } else if (s->version == SSL3_VERSION\n        && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,\n                            (int)s->session->master_key_length,\n                            s->session->master_key)) {\n        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);\n        goto f_err;\n    }\n    if (EVP_DigestVerifyFinal(mctx, data, len) <= 0) {\n        al = SSL_AD_DECRYPT_ERROR;\n        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE);\n        goto f_err;\n    }\n    if (SSL_IS_TLS13(s))\n        ret = MSG_PROCESS_CONTINUE_READING;\n    else\n        ret = MSG_PROCESS_CONTINUE_PROCESSING;\n    if (0) {\n f_err:\n        ssl3_send_alert(s, SSL3_AL_FATAL, al);\n        ossl_statem_set_error(s);\n    }\n    BIO_free(s->s3->handshake_buffer);\n    s->s3->handshake_buffer = NULL;\n    EVP_MD_CTX_free(mctx);\n#ifndef OPENSSL_NO_GOST\n    OPENSSL_free(gost_data);\n#endif\n    return ret;\n}', 'EVP_MD_CTX *EVP_MD_CTX_new(void)\n{\n    return OPENSSL_zalloc(sizeof(EVP_MD_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}', 'EVP_PKEY *X509_get0_pubkey(const X509 *x)\n{\n    if (x == NULL)\n        return NULL;\n    return X509_PUBKEY_get0(x->cert_info.key);\n}', 'EVP_PKEY *X509_PUBKEY_get0(X509_PUBKEY *key)\n{\n    EVP_PKEY *ret = NULL;\n    if (key == NULL || key->public_key == NULL)\n        return NULL;\n    if (key->pkey != NULL)\n        return key->pkey;\n    x509_pubkey_decode(&ret, key);\n    if (ret != NULL) {\n        X509err(X509_F_X509_PUBKEY_GET0, ERR_R_INTERNAL_ERROR);\n        EVP_PKEY_free(ret);\n    }\n    return NULL;\n}', 'static int x509_pubkey_decode(EVP_PKEY **ppkey, X509_PUBKEY *key)\n    {\n    EVP_PKEY *pkey = EVP_PKEY_new();\n    if (pkey == NULL) {\n        X509err(X509_F_X509_PUBKEY_DECODE, ERR_R_MALLOC_FAILURE);\n        return -1;\n    }\n    if (!EVP_PKEY_set_type(pkey, OBJ_obj2nid(key->algor->algorithm))) {\n        X509err(X509_F_X509_PUBKEY_DECODE, X509_R_UNSUPPORTED_ALGORITHM);\n        goto error;\n    }\n    if (pkey->ameth->pub_decode) {\n        if (!pkey->ameth->pub_decode(pkey, key)) {\n            X509err(X509_F_X509_PUBKEY_DECODE, X509_R_PUBLIC_KEY_DECODE_ERROR);\n            goto error;\n        }\n    } else {\n        X509err(X509_F_X509_PUBKEY_DECODE, X509_R_METHOD_NOT_SUPPORTED);\n        goto error;\n    }\n    *ppkey = pkey;\n    return 1;\n error:\n    EVP_PKEY_free(pkey);\n    return 0;\n}', 'int EVP_PKEY_id(const EVP_PKEY *pkey)\n{\n    return pkey->type;\n}']