diff options
Diffstat (limited to 'source3/libsmb/smbencrypt.c')
| -rw-r--r-- | source3/libsmb/smbencrypt.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/source3/libsmb/smbencrypt.c b/source3/libsmb/smbencrypt.c index fa1eaedb5a..de469c0293 100644 --- a/source3/libsmb/smbencrypt.c +++ b/source3/libsmb/smbencrypt.c @@ -331,5 +331,32 @@ BOOL decode_pw_buffer(char in_buffer[516], char *new_pwrd, #endif return True; +} + +/*********************************************************** + SMB signing - calculate a MAC to send. +************************************************************/ +void cli_caclulate_sign_mac(struct cli_state *cli) +{ + unsigned char calc_md5_mac[16]; + struct MD5Context md5_ctx; + + /* + * Firstly put the sequence number into the first 4 bytes. + * and zero out the next 4 bytes. + */ + SIVAL(cli->outbuf, smb_ss_field, cli->sign_info.send_seq_num); + SIVAL(cli->outbuf, smb_ss_field + 4, 0); + + /* Calculate the 16 byte MAC and place first 8 bytes into the field. */ + MD5Init(&md5_ctx); + MD5Update(&md5_ctx, cli->sign_info.mac_key, cli->sign_info.mac_key_len); + MD5Update(&md5_ctx, cli->outbuf + 4, smb_len(cli->outbuf)); + MD5Final(calc_md5_mac, &md5_ctx); + + memcpy(&cli->outbuf[smb_ss_field], calc_md5_mac, 8); + cli->sign_info.send_seq_num++; + cli->sign_info.reply_seq_num = cli->sign_info.send_seq_num; + cli->sign_info.send_seq_num++; } |