mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-11-29 14:44:17 +01:00
30535c6f5d
formatted the code to make it easier to read. no functional changes at all.
i didn't put anything from the libwiigui folder or banner folder in the beautifier.
my automated .bat seems to have done a good job. the only places i see it fucked up was on (GXColor){blablabla}. it treated the brackets in the color like all the other brackets and put the color on a new line and indented it. i think i fixed most of them. not sure if it messed up anywhere else. also not sure about how it handled different linebreaks. it looks fine on windows. if it looks messed up on linux, it can be reverted.
the code still compiles and runs fine.
127 lines
4.7 KiB
C
127 lines
4.7 KiB
C
/* crypt.h -- base code for crypt/uncrypt ZIPfile
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Version 1.01e, February 12th, 2005
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Copyright (C) 1998-2005 Gilles Vollant
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This code is a modified version of crypting code in Infozip distribution
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The encryption/decryption parts of this source code (as opposed to the
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non-echoing password parts) were originally written in Europe. The
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whole source package can be freely distributed, including from the USA.
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(Prior to January 2000, re-export from the US was a violation of US law.)
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This encryption code is a direct transcription of the algorithm from
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Roger Schlafly, described by Phil Katz in the file appnote.txt. This
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file (appnote.txt) is distributed with the PKZIP program (even in the
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version without encryption capabilities).
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If you don't need crypting in your application, just define symbols
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NOCRYPT and NOUNCRYPT.
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This code support the "Traditional PKWARE Encryption".
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The new AES encryption added on Zip format by Winzip (see the page
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http://www.winzip.com/aes_info.htm ) and PKWare PKZip 5.x Strong
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Encryption is not supported.
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*/
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#define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8))
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/***********************************************************************
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* Return the next byte in the pseudo-random sequence
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*/
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static int decrypt_byte(unsigned long* pkeys, const unsigned long* pcrc_32_tab) {
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unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an
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* unpredictable manner on 16-bit systems; not a problem
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* with any known compiler so far, though */
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temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2;
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return (int)(((temp * (temp ^ 1)) >> 8) & 0xff);
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}
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/***********************************************************************
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* Update the encryption keys with the next byte of plain text
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*/
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static int update_keys(unsigned long* pkeys,const unsigned long* pcrc_32_tab,int c) {
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(*(pkeys+0)) = CRC32((*(pkeys+0)), c);
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(*(pkeys+1)) += (*(pkeys+0)) & 0xff;
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(*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1;
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{
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register int keyshift = (int)((*(pkeys+1)) >> 24);
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(*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift);
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}
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return c;
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}
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/***********************************************************************
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* Initialize the encryption keys and the random header according to
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* the given password.
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*/
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static void init_keys(const char* passwd,unsigned long* pkeys,const unsigned long* pcrc_32_tab) {
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*(pkeys+0) = 305419896L;
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*(pkeys+1) = 591751049L;
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*(pkeys+2) = 878082192L;
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while (*passwd != '\0') {
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update_keys(pkeys,pcrc_32_tab,(int)*passwd);
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passwd++;
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}
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}
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#define zdecode(pkeys,pcrc_32_tab,c) \
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(update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab)))
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#define zencode(pkeys,pcrc_32_tab,c,t) \
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(t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c))
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#ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED
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#define RAND_HEAD_LEN 12
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/* "last resort" source for second part of crypt seed pattern */
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# ifndef ZCR_SEED2
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# define ZCR_SEED2 3141592654UL /* use PI as default pattern */
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# endif
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static int crypthead(passwd, buf, bufSize, pkeys, pcrc_32_tab, crcForCrypting)
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const char *passwd; /* password string */
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unsigned char *buf; /* where to write header */
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int bufSize;
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unsigned long* pkeys;
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const unsigned long* pcrc_32_tab;
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unsigned long crcForCrypting;
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{
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int n; /* index in random header */
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int t; /* temporary */
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int c; /* random byte */
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unsigned char header[RAND_HEAD_LEN-2]; /* random header */
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static unsigned calls = 0; /* ensure different random header each time */
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if (bufSize<RAND_HEAD_LEN)
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return 0;
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/* First generate RAND_HEAD_LEN-2 random bytes. We encrypt the
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* output of rand() to get less predictability, since rand() is
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* often poorly implemented.
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*/
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if (++calls == 1) {
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srand((unsigned)(time(NULL) ^ ZCR_SEED2));
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}
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init_keys(passwd, pkeys, pcrc_32_tab);
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for (n = 0; n < RAND_HEAD_LEN-2; n++) {
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c = (rand() >> 7) & 0xff;
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header[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, c, t);
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}
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/* Encrypt random header (last two bytes is high word of crc) */
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init_keys(passwd, pkeys, pcrc_32_tab);
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for (n = 0; n < RAND_HEAD_LEN-2; n++) {
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buf[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, header[n], t);
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}
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buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 16) & 0xff, t);
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buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 24) & 0xff, t);
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return n;
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}
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#endif
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