void ssl3_cbc_copy_mac(unsigned char *out,
                       const SSL3_RECORD *rec, unsigned md_size)
{
#if defined(CBC_MAC_ROTATE_IN_PLACE)
    unsigned char rotated_mac_buf[64 + EVP_MAX_MD_SIZE];
    unsigned char *rotated_mac;
#else
    unsigned char rotated_mac[EVP_MAX_MD_SIZE];
#endif
    unsigned mac_end = rec->length;
    unsigned mac_start = mac_end - md_size;
    unsigned scan_start = 0;
    unsigned i, j;
    unsigned div_spoiler;
    unsigned rotate_offset;
    OPENSSL_assert(rec->orig_len >= md_size);
    OPENSSL_assert(md_size <= EVP_MAX_MD_SIZE);
#if defined(CBC_MAC_ROTATE_IN_PLACE)
    rotated_mac = rotated_mac_buf + ((0 - (size_t)rotated_mac_buf) & 63);
#endif
    if (rec->orig_len > md_size + 255 + 1)
        scan_start = rec->orig_len - (md_size + 255 + 1);
    div_spoiler = md_size >> 1;
    div_spoiler <<= (sizeof(div_spoiler) - 1) * 8;
    rotate_offset = (div_spoiler + mac_start - scan_start) % md_size;
    memset(rotated_mac, 0, md_size);
    for (i = scan_start, j = 0; i < rec->orig_len; i++) {
        unsigned char mac_started = constant_time_ge_8(i, mac_start);
        unsigned char mac_ended = constant_time_ge_8(i, mac_end);
        unsigned char b = rec->data[i];
        rotated_mac[j++] |= b & mac_started & ~mac_ended;
        j &= constant_time_lt(j, md_size);
    }
#if defined(CBC_MAC_ROTATE_IN_PLACE)
    j = 0;
    for (i = 0; i < md_size; i++) {
        ((volatile unsigned char *)rotated_mac)[rotate_offset ^ 32];
        out[j++] = rotated_mac[rotate_offset++];
        rotate_offset &= constant_time_lt(rotate_offset, md_size);
    }
#else
    memset(out, 0, md_size);
    rotate_offset = md_size - rotate_offset;
    rotate_offset &= constant_time_lt(rotate_offset, md_size);
    for (i = 0; i < md_size; i++) {
        for (j = 0; j < md_size; j++)
            out[j] |= rotated_mac[i] & constant_time_eq_8(j, rotate_offset);
        rotate_offset++;
        rotate_offset &= constant_time_lt(rotate_offset, md_size);
    }
#endif
}
['int ssl3_get_record(SSL *s)\n{\n    int ssl_major, ssl_minor, al;\n    int enc_err, n, i, ret = -1;\n    SSL3_RECORD *rr;\n    SSL3_BUFFER *rbuf;\n    SSL_SESSION *sess;\n    unsigned char *p;\n    unsigned char md[EVP_MAX_MD_SIZE];\n    short version;\n    unsigned mac_size;\n    unsigned int num_recs = 0;\n    unsigned int max_recs;\n    unsigned int j;\n    rr = RECORD_LAYER_get_rrec(&s->rlayer);\n    rbuf = RECORD_LAYER_get_rbuf(&s->rlayer);\n    max_recs = s->max_pipelines;\n    if (max_recs == 0)\n        max_recs = 1;\n    sess = s->session;\n    do {\n        if ((RECORD_LAYER_get_rstate(&s->rlayer) != SSL_ST_READ_BODY) ||\n            (RECORD_LAYER_get_packet_length(&s->rlayer)\n             < SSL3_RT_HEADER_LENGTH)) {\n            n = ssl3_read_n(s, SSL3_RT_HEADER_LENGTH,\n                SSL3_BUFFER_get_len(rbuf), 0, num_recs == 0 ? 1 : 0);\n            if (n <= 0)\n                return (n);\n            RECORD_LAYER_set_rstate(&s->rlayer, SSL_ST_READ_BODY);\n            p = RECORD_LAYER_get_packet(&s->rlayer);\n            if (s->first_packet && s->server && !s->read_hash\n                    && !s->enc_read_ctx\n                    && (p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) {\n                rr[num_recs].type = SSL3_RT_HANDSHAKE;\n                rr[num_recs].rec_version = SSL2_VERSION;\n                rr[num_recs].length = ((p[0] & 0x7f) << 8) | p[1];\n                if (rr[num_recs].length > SSL3_BUFFER_get_len(rbuf)\n                                 - SSL2_RT_HEADER_LENGTH) {\n                    al = SSL_AD_RECORD_OVERFLOW;\n                    SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG);\n                    goto f_err;\n                }\n                if (rr[num_recs].length < MIN_SSL2_RECORD_LEN) {\n                    al = SSL_AD_HANDSHAKE_FAILURE;\n                    SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT);\n                    goto f_err;\n                }\n            } else {\n                if (s->msg_callback)\n                    s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s,\n                                    s->msg_callback_arg);\n                rr[num_recs].type = *(p++);\n                ssl_major = *(p++);\n                ssl_minor = *(p++);\n                version = (ssl_major << 8) | ssl_minor;\n                rr[num_recs].rec_version = version;\n                n2s(p, rr[num_recs].length);\n                if (!s->first_packet && version != s->version) {\n                    SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER);\n                    if ((s->version & 0xFF00) == (version & 0xFF00)\n                        && !s->enc_write_ctx && !s->write_hash) {\n                        if (rr->type == SSL3_RT_ALERT) {\n                             goto err;\n                        }\n                        s->version = (unsigned short)version;\n                    }\n                    al = SSL_AD_PROTOCOL_VERSION;\n                    goto f_err;\n                }\n                if ((version >> 8) != SSL3_VERSION_MAJOR) {\n                    if (s->first_packet) {\n                        p = RECORD_LAYER_get_packet(&s->rlayer);\n                        if (strncmp((char *)p, "GET ", 4) == 0 ||\n                            strncmp((char *)p, "POST ", 5) == 0 ||\n                            strncmp((char *)p, "HEAD ", 5) == 0 ||\n                            strncmp((char *)p, "PUT ", 4) == 0) {\n                            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_HTTP_REQUEST);\n                            goto err;\n                        } else if (strncmp((char *)p, "CONNE", 5) == 0) {\n                            SSLerr(SSL_F_SSL3_GET_RECORD,\n                                   SSL_R_HTTPS_PROXY_REQUEST);\n                            goto err;\n                        }\n                    }\n                    SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER);\n                    goto err;\n                }\n                if (rr[num_recs].length >\n                        SSL3_BUFFER_get_len(rbuf) - SSL3_RT_HEADER_LENGTH) {\n                    al = SSL_AD_RECORD_OVERFLOW;\n                    SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG);\n                    goto f_err;\n                }\n            }\n        }\n        if (rr[num_recs].rec_version == SSL2_VERSION) {\n            i = rr[num_recs].length + SSL2_RT_HEADER_LENGTH\n                - SSL3_RT_HEADER_LENGTH;\n        } else {\n            i = rr[num_recs].length;\n        }\n        if (i > 0) {\n            n = ssl3_read_n(s, i, i, 1, 0);\n            if (n <= 0)\n                return (n);\n        }\n        RECORD_LAYER_set_rstate(&s->rlayer, SSL_ST_READ_HEADER);\n        if(rr[num_recs].rec_version == SSL2_VERSION) {\n            rr[num_recs].input =\n                &(RECORD_LAYER_get_packet(&s->rlayer)[SSL2_RT_HEADER_LENGTH]);\n        } else {\n            rr[num_recs].input =\n                &(RECORD_LAYER_get_packet(&s->rlayer)[SSL3_RT_HEADER_LENGTH]);\n        }\n        if (rr[num_recs].length > SSL3_RT_MAX_ENCRYPTED_LENGTH) {\n            al = SSL_AD_RECORD_OVERFLOW;\n            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_ENCRYPTED_LENGTH_TOO_LONG);\n            goto f_err;\n        }\n        rr[num_recs].data = rr[num_recs].input;\n        rr[num_recs].orig_len = rr[num_recs].length;\n        rr[num_recs].read = 0;\n        num_recs++;\n        RECORD_LAYER_reset_packet_length(&s->rlayer);\n    } while (num_recs < max_recs\n             && rr[num_recs-1].type == SSL3_RT_APPLICATION_DATA\n             && SSL_USE_EXPLICIT_IV(s)\n             && s->enc_read_ctx != NULL\n             && (EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(s->enc_read_ctx))\n                & EVP_CIPH_FLAG_PIPELINE)\n             && ssl3_record_app_data_waiting(s));\n    if (SSL_USE_ETM(s) && s->read_hash) {\n        unsigned char *mac;\n        mac_size = EVP_MD_CTX_size(s->read_hash);\n        OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);\n        for (j = 0; j < num_recs; j++) {\n            if (rr[j].length < mac_size) {\n                al = SSL_AD_DECODE_ERROR;\n                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT);\n                goto f_err;\n            }\n            rr[j].length -= mac_size;\n            mac = rr[j].data + rr[j].length;\n            i = s->method->ssl3_enc->mac(s, &rr[j], md, 0   );\n            if (i < 0 || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0) {\n                al = SSL_AD_BAD_RECORD_MAC;\n                SSLerr(SSL_F_SSL3_GET_RECORD,\n                       SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);\n                goto f_err;\n            }\n        }\n    }\n    enc_err = s->method->ssl3_enc->enc(s, rr, num_recs, 0);\n    if (enc_err == 0) {\n        al = SSL_AD_DECRYPTION_FAILED;\n        SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);\n        goto f_err;\n    }\n#ifdef SSL_DEBUG\n    printf("dec %d\\n", rr->length);\n    {\n        unsigned int z;\n        for (z = 0; z < rr->length; z++)\n            printf("%02X%c", rr->data[z], ((z + 1) % 16) ? \' \' : \'\\n\');\n    }\n    printf("\\n");\n#endif\n    if ((sess != NULL) &&\n        (s->enc_read_ctx != NULL) &&\n        (EVP_MD_CTX_md(s->read_hash) != NULL) && !SSL_USE_ETM(s)) {\n        unsigned char *mac = NULL;\n        unsigned char mac_tmp[EVP_MAX_MD_SIZE];\n        mac_size = EVP_MD_CTX_size(s->read_hash);\n        OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);\n        for (j=0; j < num_recs; j++) {\n            if (rr[j].orig_len < mac_size ||\n                (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE &&\n                 rr[j].orig_len < mac_size + 1)) {\n                al = SSL_AD_DECODE_ERROR;\n                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT);\n                goto f_err;\n            }\n            if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE) {\n                mac = mac_tmp;\n                ssl3_cbc_copy_mac(mac_tmp, &rr[j], mac_size);\n                rr[j].length -= mac_size;\n            } else {\n                rr[j].length -= mac_size;\n                mac = &rr[j].data[rr[j].length];\n            }\n            i = s->method->ssl3_enc->mac(s, &rr[j], md, 0   );\n            if (i < 0 || mac == NULL\n                || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)\n                enc_err = -1;\n            if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + mac_size)\n                enc_err = -1;\n        }\n    }\n    if (enc_err < 0) {\n        al = SSL_AD_BAD_RECORD_MAC;\n        SSLerr(SSL_F_SSL3_GET_RECORD,\n               SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);\n        goto f_err;\n    }\n    for (j = 0; j < num_recs; j++) {\n        if (s->expand != NULL) {\n            if (rr[j].length > SSL3_RT_MAX_COMPRESSED_LENGTH) {\n                al = SSL_AD_RECORD_OVERFLOW;\n                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_COMPRESSED_LENGTH_TOO_LONG);\n                goto f_err;\n            }\n            if (!ssl3_do_uncompress(s, &rr[j])) {\n                al = SSL_AD_DECOMPRESSION_FAILURE;\n                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_DECOMPRESSION);\n                goto f_err;\n            }\n        }\n        if (rr[j].length > SSL3_RT_MAX_PLAIN_LENGTH) {\n            al = SSL_AD_RECORD_OVERFLOW;\n            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_DATA_LENGTH_TOO_LONG);\n            goto f_err;\n        }\n        rr[j].off = 0;\n        if (rr[j].length == 0) {\n            RECORD_LAYER_inc_empty_record_count(&s->rlayer);\n            if (RECORD_LAYER_get_empty_record_count(&s->rlayer)\n                    > MAX_EMPTY_RECORDS) {\n                al = SSL_AD_UNEXPECTED_MESSAGE;\n                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_RECORD_TOO_SMALL);\n                goto f_err;\n            }\n        } else {\n            RECORD_LAYER_reset_empty_record_count(&s->rlayer);\n        }\n    }\n    RECORD_LAYER_set_numrpipes(&s->rlayer, num_recs);\n    return 1;\n f_err:\n    ssl3_send_alert(s, SSL3_AL_FATAL, al);\n err:\n    return ret;\n}', 'void ssl3_cbc_copy_mac(unsigned char *out,\n                       const SSL3_RECORD *rec, unsigned md_size)\n{\n#if defined(CBC_MAC_ROTATE_IN_PLACE)\n    unsigned char rotated_mac_buf[64 + EVP_MAX_MD_SIZE];\n    unsigned char *rotated_mac;\n#else\n    unsigned char rotated_mac[EVP_MAX_MD_SIZE];\n#endif\n    unsigned mac_end = rec->length;\n    unsigned mac_start = mac_end - md_size;\n    unsigned scan_start = 0;\n    unsigned i, j;\n    unsigned div_spoiler;\n    unsigned rotate_offset;\n    OPENSSL_assert(rec->orig_len >= md_size);\n    OPENSSL_assert(md_size <= EVP_MAX_MD_SIZE);\n#if defined(CBC_MAC_ROTATE_IN_PLACE)\n    rotated_mac = rotated_mac_buf + ((0 - (size_t)rotated_mac_buf) & 63);\n#endif\n    if (rec->orig_len > md_size + 255 + 1)\n        scan_start = rec->orig_len - (md_size + 255 + 1);\n    div_spoiler = md_size >> 1;\n    div_spoiler <<= (sizeof(div_spoiler) - 1) * 8;\n    rotate_offset = (div_spoiler + mac_start - scan_start) % md_size;\n    memset(rotated_mac, 0, md_size);\n    for (i = scan_start, j = 0; i < rec->orig_len; i++) {\n        unsigned char mac_started = constant_time_ge_8(i, mac_start);\n        unsigned char mac_ended = constant_time_ge_8(i, mac_end);\n        unsigned char b = rec->data[i];\n        rotated_mac[j++] |= b & mac_started & ~mac_ended;\n        j &= constant_time_lt(j, md_size);\n    }\n#if defined(CBC_MAC_ROTATE_IN_PLACE)\n    j = 0;\n    for (i = 0; i < md_size; i++) {\n        ((volatile unsigned char *)rotated_mac)[rotate_offset ^ 32];\n        out[j++] = rotated_mac[rotate_offset++];\n        rotate_offset &= constant_time_lt(rotate_offset, md_size);\n    }\n#else\n    memset(out, 0, md_size);\n    rotate_offset = md_size - rotate_offset;\n    rotate_offset &= constant_time_lt(rotate_offset, md_size);\n    for (i = 0; i < md_size; i++) {\n        for (j = 0; j < md_size; j++)\n            out[j] |= rotated_mac[i] & constant_time_eq_8(j, rotate_offset);\n        rotate_offset++;\n        rotate_offset &= constant_time_lt(rotate_offset, md_size);\n    }\n#endif\n}']