aboutsummaryrefslogtreecommitdiff
path: root/lib/libRTV/crypt.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/libRTV/crypt.c')
-rw-r--r--lib/libRTV/crypt.c216
1 files changed, 0 insertions, 216 deletions
diff --git a/lib/libRTV/crypt.c b/lib/libRTV/crypt.c
deleted file mode 100644
index df4d682d6b..0000000000
--- a/lib/libRTV/crypt.c
+++ /dev/null
@@ -1,216 +0,0 @@
-#ifndef __GNUC__
-#pragma code_seg( "RTV_TEXT" )
-#pragma data_seg( "RTV_DATA" )
-#pragma bss_seg( "RTV_BSS" )
-#pragma const_seg( "RTV_RD" )
-#endif
-
-/*
- * Copyright (C) 2002 John Todd Larason <jtl@molehill.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-
-#include "crypt.h"
-#include "md5.h"
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <time.h>
-
-static void checksum(unsigned char * dest, unsigned const char * src, u32 len,
- int checksum_num)
-{
-
- static unsigned char extradata[][64] = {{
- 0x41,0x47,0xc8,0x09, 0xba,0x3c,0x99,0x6a,
- 0xda,0x09,0x9a,0x0f, 0xc0,0xd3,0x47,0xca,
- 0xd1,0x95,0x81,0x19, 0xab,0x17,0xc6,0x5f,
- 0xad,0xea,0xe5,0x75, 0x9c,0x49,0x18,0xa5,
- 0xdf,0x35,0x46,0x5b, 0x78,0x0e,0xcb,0xc7,
- 0x8c,0x3e,0xf4,0x90, 0xa2,0xb7,0x8e,0x00,
- 0x53,0x8d,0x4c,0xab, 0x13,0xa5,0x16,0x00,
- 0xff,0xb8,0x4b,0x20, 0x29,0x22,0x9d,0xee,
- }, {
- 0xda,0x76,0x5c,0xd4, 0x34,0xc3,0xd7,0x2c,
- 0xac,0x40,0xb8,0xd8, 0x59,0xbc,0x59,0x34,
- 0xaa,0xbf,0x89,0xbd, 0x85,0xe8,0x40,0x27,
- 0x78,0x2b,0x18,0x6e, 0xa6,0x6e,0x5a,0xc6,
- 0xda,0xe3,0x86,0x84, 0x40,0x14,0x2a,0x23,
- 0x4f,0x5d,0x38,0x5e, 0x7f,0xd9,0x73,0x7d,
- 0xe4,0x80,0x3d,0x21, 0x28,0x41,0xf1,0xb2,
- 0x96,0x43,0x2b,0xcc, 0x0c,0x9d,0x26,0xb9,
- }};
-
- rtv_md5_context c;
- rtv_md5_starts(&c);
- rtv_md5_update(&c, src, len);
- rtv_md5_update(&c, extradata[checksum_num], sizeof extradata[checksum_num]);
- rtv_md5_finish(&c, dest);
-
-}
-
-static u32 cryptblock(u32 k, char * buf, u32 size)
-{
- u32 i;
-
- for (i = 0; i < size; i++) {
- k = k * 0xb8f7 + 0x15bb9;
- buf[i] ^= k;
- }
- return k;
-}
-
-/* cyphertext bytes:
- *
- * 2, 4, 1, 7 -- key material block 1
- * 0, 3, 5, 6 -- unknown/unused
- * 8..23 -- checksum(24..end)
- * 24..27 -- crypt(0x42ffdfa9)
- * 28..31 -- crypt(time_t)
- * 32..end -- crypt(text)
- *
- * it looks like you should be able to decrypt 24..end in one step, after
- * getting the key material, if you don't want to do the sanity check first
- * and don't mind it all in one buffer
- */
-
-int rtv_decrypt(const char * cyphertext, u32 cyphertext_len,
- char * plainbuf, u32 plainbuf_len,
- u32 * p_time, u32 * p_plain_len,
- int checksum_num)
-{
- unsigned char key_buf[4];
- unsigned char sanity_buf[4];
- unsigned char time_buf[4];
- unsigned char csum_buf[16];
- unsigned char * p;
- u32 key;
- u32 sanity;
-#if VERBOSE_OBFUSC
- unsigned char obfusc_buf[4];
- u32 obfusc;
-#endif
-
- if (plainbuf_len < cyphertext_len - 32)
- return -1;
-
- /* unshuffle the key and unxor it */
- key_buf[0] = cyphertext[2];
- key_buf[1] = cyphertext[4];
- key_buf[2] = cyphertext[1];
- key_buf[3] = cyphertext[7];
- p = key_buf;
- key = rtv_to_u32(&p) ^ 0xcb0baf47;
-
-#if VERBOSE_OBFUSC
- obfusc_buf[0] = cyphertext[0];
- obfusc_buf[1] = cyphertext[3];
- obfusc_buf[2] = cyphertext[5];
- obfusc_buf[3] = cyphertext[6];
- p = key_buf;
- obfusc = rtv_to_u32(&p);
- //fprintf(stderr, "Key: %ld (0x%lx)\n", (unsigned long)key, (unsigned long)key);
- //fprintf(stderr, "Obfusc: %ld (0x%lx)\n", (unsigned long)obfusc, (unsigned long)obfusc);
-#endif
-
- /* check the sanity field */
- memcpy(sanity_buf, cyphertext + 24, 4);
- key = cryptblock(key, (char*)sanity_buf, 4);
- p = sanity_buf;
- sanity = rtv_to_u32(&p);
- if (sanity != 0x42ffdfa9)
- return -1;
-
- /* decrypt the time field */
- memcpy(time_buf, cyphertext + 28, 4);
- key = cryptblock(key, (char*)time_buf, 4);
-
- /* decrypt the actual text */
- memcpy(plainbuf, cyphertext + 32, cyphertext_len - 32);
- cryptblock(key, (char*)plainbuf, cyphertext_len - 32);
-
- /* check the checksum */
- checksum(csum_buf, (unsigned const char*)(cyphertext + 24), cyphertext_len - 24, checksum_num);
- if (memcmp(csum_buf, cyphertext + 8, 16) != 0)
- return -2;
-
- if (p_plain_len) {
- *p_plain_len = cyphertext_len - 32;
- }
- if (p_time) {
- p = time_buf;
- *p_time = rtv_to_u32(&p);
-#if VERBOSE_OBFUSC
-// fprintf(stderr, "Time: %ld (0x%lx)\n", (unsigned long)*p_time, (unsigned long)*p_time);
-#endif
- }
- return 0;
-}
-
-int rtv_encrypt(const char * plaintext, u32 plaintext_len,
- char * cyphertext, u32 buffer_len, u32 * cyphertext_len,
- int checksum_num)
-{
- u32 key;
- u32 t;
- u32 obfusc;
- unsigned char key_buf[4];
- unsigned char obfusc_buf[4];
- unsigned char * p;
-
- if (buffer_len < plaintext_len + 32)
- return -1;
-
- /* make up a key and obfuscatory material; get the time */
- key = rand();
- obfusc = rand();
- t = (u32)time(NULL);
-
- p = NULL;//getenv("TIMEOFF");
- if (p)
- t += atoi((char*)p);
-
- /* encrypt the key */
- p = key_buf;
- rtv_from_u32(&p, key ^ 0xcb0baf47);
-
- p = obfusc_buf;
- rtv_from_u32(&p, obfusc);
-
- /* scramble the key and obfusc material */
- cyphertext[0] = obfusc_buf[3];
- cyphertext[1] = key_buf[2];
- cyphertext[2] = key_buf[0];
- cyphertext[3] = obfusc_buf[2];
- cyphertext[4] = key_buf[1];
- cyphertext[5] = obfusc_buf[1];
- cyphertext[6] = obfusc_buf[0];
- cyphertext[7] = key_buf[3];
-
- /* store the sanity check & time */
- p = (unsigned char*)(cyphertext + 24);
- rtv_from_u32(&p, 0x42ffdfa9);
- rtv_from_u32(&p, t);
-
- /* copy the plaintext */
- memcpy(p, plaintext, plaintext_len);
-
- /* encrypt the whole thing */
- cryptblock(key, cyphertext+24, plaintext_len+8);
-
- /* fill in the checksum */
- checksum((unsigned char*)(cyphertext + 8), (unsigned const char*)(cyphertext + 24), plaintext_len + 8, checksum_num);
-
- /* and we're done */
- *cyphertext_len = plaintext_len + 32;
- return 0;
-}
generated by cgit v1.2.3 (git 2.26.2) at 2025-01-07 03:28:41 +0000