int ssl3_get_key_exchange(SSL *s)
{
#ifndef OPENSSL_NO_RSA
    unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2];
#endif
    EVP_MD_CTX md_ctx;
    unsigned char *param, *p;
    int al, j, ok;
    long i, param_len, n, alg_k, alg_a;
    EVP_PKEY *pkey = NULL;
    const EVP_MD *md = NULL;
#ifndef OPENSSL_NO_RSA
    RSA *rsa = NULL;
#endif
#ifndef OPENSSL_NO_DH
    DH *dh = NULL;
#endif
#ifndef OPENSSL_NO_EC
    EC_KEY *ecdh = NULL;
    BN_CTX *bn_ctx = NULL;
    EC_POINT *srvr_ecpoint = NULL;
    int curve_nid = 0;
    int encoded_pt_len = 0;
#endif

    EVP_MD_CTX_init(&md_ctx);

    /*
     * use same message size as in ssl3_get_certificate_request() as
     * ServerKeyExchange message may be skipped
     */
    n = s->method->ssl_get_message(s,
                                   SSL3_ST_CR_KEY_EXCH_A,
                                   SSL3_ST_CR_KEY_EXCH_B,
                                   -1, s->max_cert_list, &ok);
    if (!ok)
        return ((int)n);

    alg_k = s->s3->tmp.new_cipher->algorithm_mkey;

    if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
        /*
         * Can't skip server key exchange if this is an ephemeral
         * ciphersuite.
         */
        if (alg_k & (SSL_kDHE | SSL_kECDHE)) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
            al = SSL_AD_UNEXPECTED_MESSAGE;
            goto f_err;
        }
#ifndef OPENSSL_NO_PSK
        /*
         * In plain PSK ciphersuite, ServerKeyExchange can be omitted if no
         * identity hint is sent. Set session->sess_cert anyway to avoid
         * problems later.
         */
        if (alg_k & SSL_kPSK) {
            s->session->sess_cert = ssl_sess_cert_new();
            OPENSSL_free(s->ctx->psk_identity_hint);
            s->ctx->psk_identity_hint = NULL;
        }
#endif
        s->s3->tmp.reuse_message = 1;
        return (1);
    }

    param = p = (unsigned char *)s->init_msg;
    if (s->session->sess_cert != NULL) {
#ifndef OPENSSL_NO_RSA
        RSA_free(s->session->sess_cert->peer_rsa_tmp);
        s->session->sess_cert->peer_rsa_tmp = NULL;
#endif
#ifndef OPENSSL_NO_DH
        DH_free(s->session->sess_cert->peer_dh_tmp);
        s->session->sess_cert->peer_dh_tmp = NULL;
#endif
#ifndef OPENSSL_NO_EC
        EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
        s->session->sess_cert->peer_ecdh_tmp = NULL;
#endif
    } else {
        s->session->sess_cert = ssl_sess_cert_new();
    }

    /* Total length of the parameters including the length prefix */
    param_len = 0;

    alg_a = s->s3->tmp.new_cipher->algorithm_auth;

    al = SSL_AD_DECODE_ERROR;

#ifndef OPENSSL_NO_PSK
    if (alg_k & SSL_kPSK) {
        char tmp_id_hint[PSK_MAX_IDENTITY_LEN + 1];

        param_len = 2;
        if (param_len > n) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        n2s(p, i);

        /*
         * Store PSK identity hint for later use, hint is used in
         * ssl3_send_client_key_exchange.  Assume that the maximum length of
         * a PSK identity hint can be as long as the maximum length of a PSK
         * identity.
         */
        if (i > PSK_MAX_IDENTITY_LEN) {
            al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG);
            goto f_err;
        }
        if (i > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
                   SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
            goto f_err;
        }
        param_len += i;

        /*
         * If received PSK identity hint contains NULL characters, the hint
         * is truncated from the first NULL. p may not be ending with NULL,
         * so create a NULL-terminated string.
         */
        memcpy(tmp_id_hint, p, i);
        memset(tmp_id_hint + i, 0, PSK_MAX_IDENTITY_LEN + 1 - i);
        OPENSSL_free(s->ctx->psk_identity_hint);
        s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
        if (s->ctx->psk_identity_hint == NULL) {
            al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
            goto f_err;
        }

        p += i;
        n -= param_len;
    } else
#endif                          /* !OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_SRP
    if (alg_k & SSL_kSRP) {
        param_len = 2;
        if (param_len > n) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        n2s(p, i);

        if (i > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH);
            goto f_err;
        }
        param_len += i;

        if ((s->srp_ctx.N = BN_bin2bn(p, i, NULL)) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
            goto err;
        }
        p += i;

        if (2 > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        param_len += 2;

        n2s(p, i);

        if (i > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH);
            goto f_err;
        }
        param_len += i;

        if ((s->srp_ctx.g = BN_bin2bn(p, i, NULL)) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
            goto err;
        }
        p += i;

        if (1 > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        param_len += 1;

        i = (unsigned int)(p[0]);
        p++;

        if (i > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH);
            goto f_err;
        }
        param_len += i;

        if ((s->srp_ctx.s = BN_bin2bn(p, i, NULL)) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
            goto err;
        }
        p += i;

        if (2 > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        param_len += 2;

        n2s(p, i);

        if (i > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH);
            goto f_err;
        }
        param_len += i;

        if ((s->srp_ctx.B = BN_bin2bn(p, i, NULL)) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
            goto err;
        }
        p += i;
        n -= param_len;

        if (!srp_verify_server_param(s, &al)) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS);
            goto f_err;
        }

/* We must check if there is a certificate */
# ifndef OPENSSL_NO_RSA
        if (alg_a & SSL_aRSA)
            pkey =
                X509_get_pubkey(s->session->
                                sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
# else
        if (0) ;
# endif
# ifndef OPENSSL_NO_DSA
        else if (alg_a & SSL_aDSS)
            pkey =
                X509_get_pubkey(s->session->
                                sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
                                x509);
# endif
    } else
#endif                          /* !OPENSSL_NO_SRP */
#ifndef OPENSSL_NO_RSA
    if (alg_k & SSL_kRSA) {
        /* Temporary RSA keys only allowed in export ciphersuites */
        if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
            al = SSL_AD_UNEXPECTED_MESSAGE;
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
            goto f_err;
        }
        if ((rsa = RSA_new()) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
            goto err;
        }

        param_len = 2;
        if (param_len > n) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        n2s(p, i);

        if (i > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH);
            goto f_err;
        }
        param_len += i;

        if ((rsa->n = BN_bin2bn(p, i, rsa->n)) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
            goto err;
        }
        p += i;

        if (2 > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        param_len += 2;

        n2s(p, i);

        if (i > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH);
            goto f_err;
        }
        param_len += i;

        if ((rsa->e = BN_bin2bn(p, i, rsa->e)) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
            goto err;
        }
        p += i;
        n -= param_len;

        /* this should be because we are using an export cipher */
        if (alg_a & SSL_aRSA)
            pkey =
                X509_get_pubkey(s->session->
                                sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
        else {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
            goto err;
        }
        s->session->sess_cert->peer_rsa_tmp = rsa;
        rsa = NULL;
    }
#else                           /* OPENSSL_NO_RSA */
    if (0) ;
#endif
#ifndef OPENSSL_NO_DH
    else if (alg_k & SSL_kDHE) {
        if ((dh = DH_new()) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
            goto err;
        }

        param_len = 2;
        if (param_len > n) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        n2s(p, i);

        if (i > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
            goto f_err;
        }
        param_len += i;

        if ((dh->p = BN_bin2bn(p, i, NULL)) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
            goto err;
        }
        p += i;

        if (2 > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        param_len += 2;

        n2s(p, i);

        if (i > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH);
            goto f_err;
        }
        param_len += i;

        if ((dh->g = BN_bin2bn(p, i, NULL)) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
            goto err;
        }
        p += i;

        if (2 > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        param_len += 2;

        n2s(p, i);

        if (i > n - param_len) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH);
            goto f_err;
        }
        param_len += i;

        if ((dh->pub_key = BN_bin2bn(p, i, NULL)) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
            goto err;
        }
        p += i;
        n -= param_len;

        if (!ssl_security(s, SSL_SECOP_TMP_DH, DH_security_bits(dh), 0, dh)) {
            al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DH_KEY_TOO_SMALL);
            goto f_err;
        }
# ifndef OPENSSL_NO_RSA
        if (alg_a & SSL_aRSA)
            pkey =
                X509_get_pubkey(s->session->
                                sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
# else
        if (0) ;
# endif
# ifndef OPENSSL_NO_DSA
        else if (alg_a & SSL_aDSS)
            pkey =
                X509_get_pubkey(s->session->
                                sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
                                x509);
# endif
        /* else anonymous DH, so no certificate or pkey. */

        s->session->sess_cert->peer_dh_tmp = dh;
        dh = NULL;
    }
#endif                          /* !OPENSSL_NO_DH */

#ifndef OPENSSL_NO_EC
    else if (alg_k & SSL_kECDHE) {
        EC_GROUP *ngroup;
        const EC_GROUP *group;

        if ((ecdh = EC_KEY_new()) == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
            goto err;
        }

        /*
         * Extract elliptic curve parameters and the server's ephemeral ECDH
         * public key. Keep accumulating lengths of various components in
         * param_len and make sure it never exceeds n.
         */

        /*
         * XXX: For now we only support named (not generic) curves and the
         * ECParameters in this case is just three bytes. We also need one
         * byte for the length of the encoded point
         */
        param_len = 4;
        if (param_len > n) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        /*
         * Check curve is one of our preferences, if not server has sent an
         * invalid curve. ECParameters is 3 bytes.
         */
        if (!tls1_check_curve(s, p, 3)) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_CURVE);
            goto f_err;
        }

        if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) {
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
                   SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
            goto f_err;
        }

        ngroup = EC_GROUP_new_by_curve_name(curve_nid);
        if (ngroup == NULL) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
            goto err;
        }
        if (EC_KEY_set_group(ecdh, ngroup) == 0) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
            goto err;
        }
        EC_GROUP_free(ngroup);

        group = EC_KEY_get0_group(ecdh);

        if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
            (EC_GROUP_get_degree(group) > 163)) {
            al = SSL_AD_EXPORT_RESTRICTION;
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
                   SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
            goto f_err;
        }

        p += 3;

        /* Next, get the encoded ECPoint */
        if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
            ((bn_ctx = BN_CTX_new()) == NULL)) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
            goto err;
        }

        encoded_pt_len = *p;    /* length of encoded point */
        p += 1;

        if ((encoded_pt_len > n - param_len) ||
            (EC_POINT_oct2point(group, srvr_ecpoint,
                                p, encoded_pt_len, bn_ctx) == 0)) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
            goto f_err;
        }
        param_len += encoded_pt_len;

        n -= param_len;
        p += encoded_pt_len;

        /*
         * The ECC/TLS specification does not mention the use of DSA to sign
         * ECParameters in the server key exchange message. We do support RSA
         * and ECDSA.
         */
        if (0) ;
# ifndef OPENSSL_NO_RSA
        else if (alg_a & SSL_aRSA)
            pkey =
                X509_get_pubkey(s->session->
                                sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
# endif
# ifndef OPENSSL_NO_EC
        else if (alg_a & SSL_aECDSA)
            pkey =
                X509_get_pubkey(s->session->
                                sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
# endif
        /* else anonymous ECDH, so no certificate or pkey. */
        EC_KEY_set_public_key(ecdh, srvr_ecpoint);
        s->session->sess_cert->peer_ecdh_tmp = ecdh;
        ecdh = NULL;
        BN_CTX_free(bn_ctx);
        bn_ctx = NULL;
        EC_POINT_free(srvr_ecpoint);
        srvr_ecpoint = NULL;
    } else if (alg_k) {
        al = SSL_AD_UNEXPECTED_MESSAGE;
        SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
        goto f_err;
    }
#endif                          /* !OPENSSL_NO_EC */

    /* p points to the next byte, there are 'n' bytes left */

    /* if it was signed, check the signature */
    if (pkey != NULL) {
        if (SSL_USE_SIGALGS(s)) {
            int rv;
            if (2 > n) {
                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
                goto f_err;
            }
            rv = tls12_check_peer_sigalg(&md, s, p, pkey);
            if (rv == -1)
                goto err;
            else if (rv == 0) {
                goto f_err;
            }
#ifdef SSL_DEBUG
            fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
#endif
            p += 2;
            n -= 2;
        } else
            md = EVP_sha1();

        if (2 > n) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
        n2s(p, i);
        n -= 2;
        j = EVP_PKEY_size(pkey);

        /*
         * Check signature length. If n is 0 then signature is empty
         */
        if ((i != n) || (n > j) || (n <= 0)) {
            /* wrong packet length */
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH);
            goto f_err;
        }
#ifndef OPENSSL_NO_RSA
        if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
            int num;
            unsigned int size;

            j = 0;
            q = md_buf;
            for (num = 2; num > 0; num--) {
                EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
                EVP_DigestInit_ex(&md_ctx, (num == 2)
                                  ? s->ctx->md5 : s->ctx->sha1, NULL);
                EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
                                 SSL3_RANDOM_SIZE);
                EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
                                 SSL3_RANDOM_SIZE);
                EVP_DigestUpdate(&md_ctx, param, param_len);
                EVP_DigestFinal_ex(&md_ctx, q, &size);
                q += size;
                j += size;
            }
            i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa);
            if (i < 0) {
                al = SSL_AD_DECRYPT_ERROR;
                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT);
                goto f_err;
            }
            if (i == 0) {
                /* bad signature */
                al = SSL_AD_DECRYPT_ERROR;
                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
                goto f_err;
            }
        } else
#endif
        {
            EVP_VerifyInit_ex(&md_ctx, md, NULL);
            EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
                             SSL3_RANDOM_SIZE);
            EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
                             SSL3_RANDOM_SIZE);
            EVP_VerifyUpdate(&md_ctx, param, param_len);
            if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
                /* bad signature */
                al = SSL_AD_DECRYPT_ERROR;
                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
                goto f_err;
            }
        }
    } else {
        /* aNULL, aSRP or kPSK do not need public keys */
        if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_kPSK)) {
            /* Might be wrong key type, check it */
            if (ssl3_check_cert_and_algorithm(s))
                /* Otherwise this shouldn't happen */
                SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
            goto err;
        }
        /* still data left over */
        if (n != 0) {
            SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
            goto f_err;
        }
    }
    EVP_PKEY_free(pkey);
    EVP_MD_CTX_cleanup(&md_ctx);
    return (1);
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
 err:
    EVP_PKEY_free(pkey);
#ifndef OPENSSL_NO_RSA
    RSA_free(rsa);
#endif
#ifndef OPENSSL_NO_DH
    DH_free(dh);
#endif
#ifndef OPENSSL_NO_EC
    BN_CTX_free(bn_ctx);
    EC_POINT_free(srvr_ecpoint);
    EC_KEY_free(ecdh);
#endif
    EVP_MD_CTX_cleanup(&md_ctx);
    s->state = SSL_ST_ERR;
    return (-1);
}