X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=blobdiff_plain;f=pdf2swf%2Fxpdf%2FDecrypt.cc;fp=pdf2swf%2Fxpdf%2FDecrypt.cc;h=0000000000000000000000000000000000000000;hp=91eb452a8152c50429c725ea6b5b9026ac5125f1;hb=5a005ef586b9000810156a961b9622c903dce988;hpb=c26ca847941ca0acfc9f3b4bdc519d904ba09a39

diff --git a/pdf2swf/xpdf/Decrypt.cc b/pdf2swf/xpdf/Decrypt.cc
deleted file mode 100644
index 91eb452..0000000
--- a/pdf2swf/xpdf/Decrypt.cc
+++ /dev/null
@@ -1,411 +0,0 @@
-//========================================================================
-//
-// Decrypt.cc
-//
-// Copyright 1996-2003 Glyph & Cog, LLC
-//
-//========================================================================
-
-#include <aconf.h>
-
-#ifdef USE_GCC_PRAGMAS
-#pragma implementation
-#endif
-
-#include <string.h>
-#include "gmem.h"
-#include "Decrypt.h"
-
-static void rc4InitKey(Guchar *key, int keyLen, Guchar *state);
-static Guchar rc4DecryptByte(Guchar *state, Guchar *x, Guchar *y, Guchar c);
-static void md5(Guchar *msg, int msgLen, Guchar *digest);
-
-static Guchar passwordPad[32] = {
-  0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41,
-  0x64, 0x00, 0x4e, 0x56, 0xff, 0xfa, 0x01, 0x08, 
-  0x2e, 0x2e, 0x00, 0xb6, 0xd0, 0x68, 0x3e, 0x80, 
-  0x2f, 0x0c, 0xa9, 0xfe, 0x64, 0x53, 0x69, 0x7a
-};
-
-//------------------------------------------------------------------------
-// Decrypt
-//------------------------------------------------------------------------
-
-Decrypt::Decrypt(Guchar *fileKey, int keyLength, int objNum, int objGen) {
-  int i;
-
-  // construct object key
-  for (i = 0; i < keyLength; ++i) {
-    objKey[i] = fileKey[i];
-  }
-  objKey[keyLength] = objNum & 0xff;
-  objKey[keyLength + 1] = (objNum >> 8) & 0xff;
-  objKey[keyLength + 2] = (objNum >> 16) & 0xff;
-  objKey[keyLength + 3] = objGen & 0xff;
-  objKey[keyLength + 4] = (objGen >> 8) & 0xff;
-  md5(objKey, keyLength + 5, objKey);
-
-  // set up for decryption
-  x = y = 0;
-  if ((objKeyLength = keyLength + 5) > 16) {
-    objKeyLength = 16;
-  }
-  rc4InitKey(objKey, objKeyLength, state);
-}
-
-void Decrypt::reset() {
-  x = y = 0;
-  rc4InitKey(objKey, objKeyLength, state);
-}
-
-Guchar Decrypt::decryptByte(Guchar c) {
-  return rc4DecryptByte(state, &x, &y, c);
-}
-
-GBool Decrypt::makeFileKey(int encVersion, int encRevision, int keyLength,
-			   GString *ownerKey, GString *userKey,
-			   int permissions, GString *fileID,
-			   GString *ownerPassword, GString *userPassword,
-			   Guchar *fileKey, GBool encryptMetadata,
-			   GBool *ownerPasswordOk) {
-  Guchar test[32], test2[32];
-  GString *userPassword2;
-  Guchar fState[256];
-  Guchar tmpKey[16];
-  Guchar fx, fy;
-  int len, i, j;
-
-  // try using the supplied owner password to generate the user password
-  *ownerPasswordOk = gFalse;
-  if (ownerPassword) {
-    len = ownerPassword->getLength();
-    if (len < 32) {
-      memcpy(test, ownerPassword->getCString(), len);
-      memcpy(test + len, passwordPad, 32 - len);
-    } else {
-      memcpy(test, ownerPassword->getCString(), 32);
-    }
-    md5(test, 32, test);
-    if (encRevision == 3) {
-      for (i = 0; i < 50; ++i) {
-	md5(test, 16, test);
-      }
-    }
-    if (encRevision == 2) {
-      rc4InitKey(test, keyLength, fState);
-      fx = fy = 0;
-      for (i = 0; i < 32; ++i) {
-	test2[i] = rc4DecryptByte(fState, &fx, &fy, ownerKey->getChar(i));
-      }
-    } else {
-      memcpy(test2, ownerKey->getCString(), 32);
-      for (i = 19; i >= 0; --i) {
-	for (j = 0; j < keyLength; ++j) {
-	  tmpKey[j] = test[j] ^ i;
-	}
-	rc4InitKey(tmpKey, keyLength, fState);
-	fx = fy = 0;
-	for (j = 0; j < 32; ++j) {
-	  test2[j] = rc4DecryptByte(fState, &fx, &fy, test2[j]);
-	}
-      }
-    }
-    userPassword2 = new GString((char *)test2, 32);
-    if (makeFileKey2(encVersion, encRevision, keyLength, ownerKey, userKey,
-		     permissions, fileID, userPassword2, fileKey,
-		     encryptMetadata)) {
-      *ownerPasswordOk = gTrue;
-      delete userPassword2;
-      return gTrue;
-    }
-    delete userPassword2;
-  }
-
-  // try using the supplied user password
-  return makeFileKey2(encVersion, encRevision, keyLength, ownerKey, userKey,
-		      permissions, fileID, userPassword, fileKey,
-		      encryptMetadata);
-}
-
-GBool Decrypt::makeFileKey2(int encVersion, int encRevision, int keyLength,
-			    GString *ownerKey, GString *userKey,
-			    int permissions, GString *fileID,
-			    GString *userPassword, Guchar *fileKey,
-			    GBool encryptMetadata) {
-  Guchar *buf;
-  Guchar test[32];
-  Guchar fState[256];
-  Guchar tmpKey[16];
-  Guchar fx, fy;
-  int len, i, j;
-  GBool ok;
-
-  // generate file key
-  buf = (Guchar *)gmalloc(72 + fileID->getLength());
-  if (userPassword) {
-    len = userPassword->getLength();
-    if (len < 32) {
-      memcpy(buf, userPassword->getCString(), len);
-      memcpy(buf + len, passwordPad, 32 - len);
-    } else {
-      memcpy(buf, userPassword->getCString(), 32);
-    }
-  } else {
-    memcpy(buf, passwordPad, 32);
-  }
-  memcpy(buf + 32, ownerKey->getCString(), 32);
-  buf[64] = permissions & 0xff;
-  buf[65] = (permissions >> 8) & 0xff;
-  buf[66] = (permissions >> 16) & 0xff;
-  buf[67] = (permissions >> 24) & 0xff;
-  memcpy(buf + 68, fileID->getCString(), fileID->getLength());
-  len = 68 + fileID->getLength();
-  if (!encryptMetadata) {
-    buf[len++] = 0xff;
-    buf[len++] = 0xff;
-    buf[len++] = 0xff;
-    buf[len++] = 0xff;
-  }
-  md5(buf, len, fileKey);
-  if (encRevision == 3) {
-    for (i = 0; i < 50; ++i) {
-      md5(fileKey, keyLength, fileKey);
-    }
-  }
-
-  // test user password
-  if (encRevision == 2) {
-    rc4InitKey(fileKey, keyLength, fState);
-    fx = fy = 0;
-    for (i = 0; i < 32; ++i) {
-      test[i] = rc4DecryptByte(fState, &fx, &fy, userKey->getChar(i));
-    }
-    ok = memcmp(test, passwordPad, 32) == 0;
-  } else if (encRevision == 3) {
-    memcpy(test, userKey->getCString(), 32);
-    for (i = 19; i >= 0; --i) {
-      for (j = 0; j < keyLength; ++j) {
-	tmpKey[j] = fileKey[j] ^ i;
-      }
-      rc4InitKey(tmpKey, keyLength, fState);
-      fx = fy = 0;
-      for (j = 0; j < 32; ++j) {
-	test[j] = rc4DecryptByte(fState, &fx, &fy, test[j]);
-      }
-    }
-    memcpy(buf, passwordPad, 32);
-    memcpy(buf + 32, fileID->getCString(), fileID->getLength());
-    md5(buf, 32 + fileID->getLength(), buf);
-    ok = memcmp(test, buf, 16) == 0;
-  } else {
-    ok = gFalse;
-  }
-
-  gfree(buf);
-  return ok;
-}
-
-//------------------------------------------------------------------------
-// RC4-compatible decryption
-//------------------------------------------------------------------------
-
-static void rc4InitKey(Guchar *key, int keyLen, Guchar *state) {
-  Guchar index1, index2;
-  Guchar t;
-  int i;
-
-  for (i = 0; i < 256; ++i)
-    state[i] = i;
-  index1 = index2 = 0;
-  for (i = 0; i < 256; ++i) {
-    index2 = (key[index1] + state[i] + index2) % 256;
-    t = state[i];
-    state[i] = state[index2];
-    state[index2] = t;
-    index1 = (index1 + 1) % keyLen;
-  }
-}
-
-static Guchar rc4DecryptByte(Guchar *state, Guchar *x, Guchar *y, Guchar c) {
-  Guchar x1, y1, tx, ty;
-
-  x1 = *x = (*x + 1) % 256;
-  y1 = *y = (state[*x] + *y) % 256;
-  tx = state[x1];
-  ty = state[y1];
-  state[x1] = ty;
-  state[y1] = tx;
-  return c ^ state[(tx + ty) % 256];
-}
-
-//------------------------------------------------------------------------
-// MD5 message digest
-//------------------------------------------------------------------------
-
-// this works around a bug in older Sun compilers
-static inline Gulong rotateLeft(Gulong x, int r) {
-  x &= 0xffffffff;
-  return ((x << r) | (x >> (32 - r))) & 0xffffffff;
-}
-
-static inline Gulong md5Round1(Gulong a, Gulong b, Gulong c, Gulong d,
-			       Gulong Xk,  Gulong s, Gulong Ti) {
-  return b + rotateLeft((a + ((b & c) | (~b & d)) + Xk + Ti), s);
-}
-
-static inline Gulong md5Round2(Gulong a, Gulong b, Gulong c, Gulong d,
-			       Gulong Xk,  Gulong s, Gulong Ti) {
-  return b + rotateLeft((a + ((b & d) | (c & ~d)) + Xk + Ti), s);
-}
-
-static inline Gulong md5Round3(Gulong a, Gulong b, Gulong c, Gulong d,
-			       Gulong Xk,  Gulong s, Gulong Ti) {
-  return b + rotateLeft((a + (b ^ c ^ d) + Xk + Ti), s);
-}
-
-static inline Gulong md5Round4(Gulong a, Gulong b, Gulong c, Gulong d,
-			       Gulong Xk,  Gulong s, Gulong Ti) {
-  return b + rotateLeft((a + (c ^ (b | ~d)) + Xk + Ti), s);
-}
-
-static void md5(Guchar *msg, int msgLen, Guchar *digest) {
-  Gulong x[16];
-  Gulong a, b, c, d, aa, bb, cc, dd;
-  int n64;
-  int i, j, k;
-
-  // compute number of 64-byte blocks
-  // (length + pad byte (0x80) + 8 bytes for length)
-  n64 = (msgLen + 1 + 8 + 63) / 64;
-
-  // initialize a, b, c, d
-  a = 0x67452301;
-  b = 0xefcdab89;
-  c = 0x98badcfe;
-  d = 0x10325476;
-
-  // loop through blocks
-  k = 0;
-  for (i = 0; i < n64; ++i) {
-
-    // grab a 64-byte block
-    for (j = 0; j < 16 && k < msgLen - 3; ++j, k += 4)
-      x[j] = (((((msg[k+3] << 8) + msg[k+2]) << 8) + msg[k+1]) << 8) + msg[k];
-    if (i == n64 - 1) {
-      if (k == msgLen - 3)
-	x[j] = 0x80000000 + (((msg[k+2] << 8) + msg[k+1]) << 8) + msg[k];
-      else if (k == msgLen - 2)
-	x[j] = 0x800000 + (msg[k+1] << 8) + msg[k];
-      else if (k == msgLen - 1)
-	x[j] = 0x8000 + msg[k];
-      else
-	x[j] = 0x80;
-      ++j;
-      while (j < 16)
-	x[j++] = 0;
-      x[14] = msgLen << 3;
-    }
-
-    // save a, b, c, d
-    aa = a;
-    bb = b;
-    cc = c;
-    dd = d;
-
-    // round 1
-    a = md5Round1(a, b, c, d, x[0],   7, 0xd76aa478);
-    d = md5Round1(d, a, b, c, x[1],  12, 0xe8c7b756);
-    c = md5Round1(c, d, a, b, x[2],  17, 0x242070db);
-    b = md5Round1(b, c, d, a, x[3],  22, 0xc1bdceee);
-    a = md5Round1(a, b, c, d, x[4],   7, 0xf57c0faf);
-    d = md5Round1(d, a, b, c, x[5],  12, 0x4787c62a);
-    c = md5Round1(c, d, a, b, x[6],  17, 0xa8304613);
-    b = md5Round1(b, c, d, a, x[7],  22, 0xfd469501);
-    a = md5Round1(a, b, c, d, x[8],   7, 0x698098d8);
-    d = md5Round1(d, a, b, c, x[9],  12, 0x8b44f7af);
-    c = md5Round1(c, d, a, b, x[10], 17, 0xffff5bb1);
-    b = md5Round1(b, c, d, a, x[11], 22, 0x895cd7be);
-    a = md5Round1(a, b, c, d, x[12],  7, 0x6b901122);
-    d = md5Round1(d, a, b, c, x[13], 12, 0xfd987193);
-    c = md5Round1(c, d, a, b, x[14], 17, 0xa679438e);
-    b = md5Round1(b, c, d, a, x[15], 22, 0x49b40821);
-
-    // round 2
-    a = md5Round2(a, b, c, d, x[1],   5, 0xf61e2562);
-    d = md5Round2(d, a, b, c, x[6],   9, 0xc040b340);
-    c = md5Round2(c, d, a, b, x[11], 14, 0x265e5a51);
-    b = md5Round2(b, c, d, a, x[0],  20, 0xe9b6c7aa);
-    a = md5Round2(a, b, c, d, x[5],   5, 0xd62f105d);
-    d = md5Round2(d, a, b, c, x[10],  9, 0x02441453);
-    c = md5Round2(c, d, a, b, x[15], 14, 0xd8a1e681);
-    b = md5Round2(b, c, d, a, x[4],  20, 0xe7d3fbc8);
-    a = md5Round2(a, b, c, d, x[9],   5, 0x21e1cde6);
-    d = md5Round2(d, a, b, c, x[14],  9, 0xc33707d6);
-    c = md5Round2(c, d, a, b, x[3],  14, 0xf4d50d87);
-    b = md5Round2(b, c, d, a, x[8],  20, 0x455a14ed);
-    a = md5Round2(a, b, c, d, x[13],  5, 0xa9e3e905);
-    d = md5Round2(d, a, b, c, x[2],   9, 0xfcefa3f8);
-    c = md5Round2(c, d, a, b, x[7],  14, 0x676f02d9);
-    b = md5Round2(b, c, d, a, x[12], 20, 0x8d2a4c8a);
-
-    // round 3
-    a = md5Round3(a, b, c, d, x[5],   4, 0xfffa3942);
-    d = md5Round3(d, a, b, c, x[8],  11, 0x8771f681);
-    c = md5Round3(c, d, a, b, x[11], 16, 0x6d9d6122);
-    b = md5Round3(b, c, d, a, x[14], 23, 0xfde5380c);
-    a = md5Round3(a, b, c, d, x[1],   4, 0xa4beea44);
-    d = md5Round3(d, a, b, c, x[4],  11, 0x4bdecfa9);
-    c = md5Round3(c, d, a, b, x[7],  16, 0xf6bb4b60);
-    b = md5Round3(b, c, d, a, x[10], 23, 0xbebfbc70);
-    a = md5Round3(a, b, c, d, x[13],  4, 0x289b7ec6);
-    d = md5Round3(d, a, b, c, x[0],  11, 0xeaa127fa);
-    c = md5Round3(c, d, a, b, x[3],  16, 0xd4ef3085);
-    b = md5Round3(b, c, d, a, x[6],  23, 0x04881d05);
-    a = md5Round3(a, b, c, d, x[9],   4, 0xd9d4d039);
-    d = md5Round3(d, a, b, c, x[12], 11, 0xe6db99e5);
-    c = md5Round3(c, d, a, b, x[15], 16, 0x1fa27cf8);
-    b = md5Round3(b, c, d, a, x[2],  23, 0xc4ac5665);
-
-    // round 4
-    a = md5Round4(a, b, c, d, x[0],   6, 0xf4292244);
-    d = md5Round4(d, a, b, c, x[7],  10, 0x432aff97);
-    c = md5Round4(c, d, a, b, x[14], 15, 0xab9423a7);
-    b = md5Round4(b, c, d, a, x[5],  21, 0xfc93a039);
-    a = md5Round4(a, b, c, d, x[12],  6, 0x655b59c3);
-    d = md5Round4(d, a, b, c, x[3],  10, 0x8f0ccc92);
-    c = md5Round4(c, d, a, b, x[10], 15, 0xffeff47d);
-    b = md5Round4(b, c, d, a, x[1],  21, 0x85845dd1);
-    a = md5Round4(a, b, c, d, x[8],   6, 0x6fa87e4f);
-    d = md5Round4(d, a, b, c, x[15], 10, 0xfe2ce6e0);
-    c = md5Round4(c, d, a, b, x[6],  15, 0xa3014314);
-    b = md5Round4(b, c, d, a, x[13], 21, 0x4e0811a1);
-    a = md5Round4(a, b, c, d, x[4],   6, 0xf7537e82);
-    d = md5Round4(d, a, b, c, x[11], 10, 0xbd3af235);
-    c = md5Round4(c, d, a, b, x[2],  15, 0x2ad7d2bb);
-    b = md5Round4(b, c, d, a, x[9],  21, 0xeb86d391);
-
-    // increment a, b, c, d
-    a += aa;
-    b += bb;
-    c += cc;
-    d += dd;
-  }
-
-  // break digest into bytes
-  digest[0] = (Guchar)(a & 0xff);
-  digest[1] = (Guchar)((a >>= 8) & 0xff);
-  digest[2] = (Guchar)((a >>= 8) & 0xff);
-  digest[3] = (Guchar)((a >>= 8) & 0xff);
-  digest[4] = (Guchar)(b & 0xff);
-  digest[5] = (Guchar)((b >>= 8) & 0xff);
-  digest[6] = (Guchar)((b >>= 8) & 0xff);
-  digest[7] = (Guchar)((b >>= 8) & 0xff);
-  digest[8] = (Guchar)(c & 0xff);
-  digest[9] = (Guchar)((c >>= 8) & 0xff);
-  digest[10] = (Guchar)((c >>= 8) & 0xff);
-  digest[11] = (Guchar)((c >>= 8) & 0xff);
-  digest[12] = (Guchar)(d & 0xff);
-  digest[13] = (Guchar)((d >>= 8) & 0xff);
-  digest[14] = (Guchar)((d >>= 8) & 0xff);
-  digest[15] = (Guchar)((d >>= 8) & 0xff);
-}