Index: third_party/zlib/contrib/minizip/crypt.h |
=================================================================== |
--- third_party/zlib/contrib/minizip/crypt.h (revision 0) |
+++ third_party/zlib/contrib/minizip/crypt.h (revision 0) |
@@ -0,0 +1,132 @@ |
+/* crypt.h -- base code for crypt/uncrypt ZIPfile |
+ |
+ |
+ Version 1.01e, February 12th, 2005 |
+ |
+ Copyright (C) 1998-2005 Gilles Vollant |
+ |
+ This code is a modified version of crypting code in Infozip distribution |
+ |
+ The encryption/decryption parts of this source code (as opposed to the |
+ non-echoing password parts) were originally written in Europe. The |
+ whole source package can be freely distributed, including from the USA. |
+ (Prior to January 2000, re-export from the US was a violation of US law.) |
+ |
+ This encryption code is a direct transcription of the algorithm from |
+ Roger Schlafly, described by Phil Katz in the file appnote.txt. This |
+ file (appnote.txt) is distributed with the PKZIP program (even in the |
+ version without encryption capabilities). |
+ |
+ If you don't need crypting in your application, just define symbols |
+ NOCRYPT and NOUNCRYPT. |
+ |
+ This code support the "Traditional PKWARE Encryption". |
+ |
+ The new AES encryption added on Zip format by Winzip (see the page |
+ http://www.winzip.com/aes_info.htm ) and PKWare PKZip 5.x Strong |
+ Encryption is not supported. |
+*/ |
+ |
+#define CRC32(c, b) ((*(pcrc_32_tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8)) |
+ |
+/*********************************************************************** |
+ * Return the next byte in the pseudo-random sequence |
+ */ |
+static int decrypt_byte(unsigned long* pkeys, const unsigned long* pcrc_32_tab) |
+{ |
+ unsigned temp; /* POTENTIAL BUG: temp*(temp^1) may overflow in an |
+ * unpredictable manner on 16-bit systems; not a problem |
+ * with any known compiler so far, though */ |
+ |
+ temp = ((unsigned)(*(pkeys+2)) & 0xffff) | 2; |
+ return (int)(((temp * (temp ^ 1)) >> 8) & 0xff); |
+} |
+ |
+/*********************************************************************** |
+ * Update the encryption keys with the next byte of plain text |
+ */ |
+static int update_keys(unsigned long* pkeys,const unsigned long* pcrc_32_tab,int c) |
+{ |
+ (*(pkeys+0)) = CRC32((*(pkeys+0)), c); |
+ (*(pkeys+1)) += (*(pkeys+0)) & 0xff; |
+ (*(pkeys+1)) = (*(pkeys+1)) * 134775813L + 1; |
+ { |
+ register int keyshift = (int)((*(pkeys+1)) >> 24); |
+ (*(pkeys+2)) = CRC32((*(pkeys+2)), keyshift); |
+ } |
+ return c; |
+} |
+ |
+ |
+/*********************************************************************** |
+ * Initialize the encryption keys and the random header according to |
+ * the given password. |
+ */ |
+static void init_keys(const char* passwd,unsigned long* pkeys,const unsigned long* pcrc_32_tab) |
+{ |
+ *(pkeys+0) = 305419896L; |
+ *(pkeys+1) = 591751049L; |
+ *(pkeys+2) = 878082192L; |
+ while (*passwd != '\0') { |
+ update_keys(pkeys,pcrc_32_tab,(int)*passwd); |
+ passwd++; |
+ } |
+} |
+ |
+#define zdecode(pkeys,pcrc_32_tab,c) \ |
+ (update_keys(pkeys,pcrc_32_tab,c ^= decrypt_byte(pkeys,pcrc_32_tab))) |
+ |
+#define zencode(pkeys,pcrc_32_tab,c,t) \ |
+ (t=decrypt_byte(pkeys,pcrc_32_tab), update_keys(pkeys,pcrc_32_tab,c), t^(c)) |
+ |
+#ifdef INCLUDECRYPTINGCODE_IFCRYPTALLOWED |
+ |
+#define RAND_HEAD_LEN 12 |
+ /* "last resort" source for second part of crypt seed pattern */ |
+# ifndef ZCR_SEED2 |
+# define ZCR_SEED2 3141592654UL /* use PI as default pattern */ |
+# endif |
+ |
+static int crypthead(passwd, buf, bufSize, pkeys, pcrc_32_tab, crcForCrypting) |
+ const char *passwd; /* password string */ |
+ unsigned char *buf; /* where to write header */ |
+ int bufSize; |
+ unsigned long* pkeys; |
+ const unsigned long* pcrc_32_tab; |
+ unsigned long crcForCrypting; |
+{ |
+ int n; /* index in random header */ |
+ int t; /* temporary */ |
+ int c; /* random byte */ |
+ unsigned char header[RAND_HEAD_LEN-2]; /* random header */ |
+ static unsigned calls = 0; /* ensure different random header each time */ |
+ |
+ if (bufSize<RAND_HEAD_LEN) |
+ return 0; |
+ |
+ /* First generate RAND_HEAD_LEN-2 random bytes. We encrypt the |
+ * output of rand() to get less predictability, since rand() is |
+ * often poorly implemented. |
+ */ |
+ if (++calls == 1) |
+ { |
+ srand((unsigned)(time(NULL) ^ ZCR_SEED2)); |
+ } |
+ init_keys(passwd, pkeys, pcrc_32_tab); |
+ for (n = 0; n < RAND_HEAD_LEN-2; n++) |
+ { |
+ c = (rand() >> 7) & 0xff; |
+ header[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, c, t); |
+ } |
+ /* Encrypt random header (last two bytes is high word of crc) */ |
+ init_keys(passwd, pkeys, pcrc_32_tab); |
+ for (n = 0; n < RAND_HEAD_LEN-2; n++) |
+ { |
+ buf[n] = (unsigned char)zencode(pkeys, pcrc_32_tab, header[n], t); |
+ } |
+ buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 16) & 0xff, t); |
+ buf[n++] = zencode(pkeys, pcrc_32_tab, (int)(crcForCrypting >> 24) & 0xff, t); |
+ return n; |
+} |
+ |
+#endif |
Property changes on: third_party\zlib\contrib\minizip\crypt.h |
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Added: svn:eol-style |
+ LF |