xpdf-no-select-disableHEADmaster

1 files changed, 1620 insertions, 0 deletions

diff --git a/xpdf/Decrypt.cc b/xpdf/Decrypt.cc
new file mode 100644
index 0000000..d4f8d4e
--- /dev/null
+++ b/xpdf/Decrypt.cc
@@ -0,0 +1,1620 @@
+//========================================================================
+//
+// 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 "gmempp.h"
+#include "Decrypt.h"
+
+static void aes256KeyExpansion(DecryptAES256State *s,
+			       Guchar *objKey, int objKeyLen);
+static void aes256DecryptBlock(DecryptAES256State *s, Guchar *in, GBool last);
+static void sha256(Guchar *msg, int msgLen, Guchar *hash);
+static void sha384(Guchar *msg, int msgLen, Guchar *hash);
+static void sha512(Guchar *msg, int msgLen, Guchar *hash);
+
+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
+//------------------------------------------------------------------------
+
+GBool Decrypt::makeFileKey(int encVersion, int encRevision, int keyLength,
+			   GString *ownerKey, GString *userKey,
+			   GString *ownerEnc, GString *userEnc,
+			   int permissions, GString *fileID,
+			   GString *ownerPassword, GString *userPassword,
+			   Guchar *fileKey, GBool encryptMetadata,
+			   GBool *ownerPasswordOk) {
+  DecryptAES256State state;
+  Guchar test[127 + 56], test2[32];
+  GString *userPassword2;
+  const char *userPW;
+  Guchar fState[256];
+  Guchar tmpKey[16];
+  Guchar fx, fy;
+  int len, i, j;
+
+  *ownerPasswordOk = gFalse;
+
+  if (encRevision == 5 || encRevision == 6) {
+
+    // check the owner password
+    if (ownerPassword) {
+      //~ this is supposed to convert the password to UTF-8 using "SASLprep"
+      len = ownerPassword->getLength();
+      if (len > 127) {
+	len = 127;
+      }
+      memcpy(test, ownerPassword->getCString(), len);
+      memcpy(test + len, ownerKey->getCString() + 32, 8);
+      memcpy(test + len + 8, userKey->getCString(), 48);
+      sha256(test, len + 56, test);
+      if (encRevision == 6) {
+	r6Hash(test, 32, ownerPassword->getCString(), len,
+	       userKey->getCString());
+      }
+      if (!memcmp(test, ownerKey->getCString(), 32)) {
+
+	// compute the file key from the owner password
+	memcpy(test, ownerPassword->getCString(), len);
+	memcpy(test + len, ownerKey->getCString() + 40, 8);
+	memcpy(test + len + 8, userKey->getCString(), 48);
+	sha256(test, len + 56, test);
+	if (encRevision == 6) {
+	  r6Hash(test, 32, ownerPassword->getCString(), len,
+		 userKey->getCString());
+	}
+	aes256KeyExpansion(&state, test, 32);
+	for (i = 0; i < 16; ++i) {
+	  state.cbc[i] = 0;
+	}
+	aes256DecryptBlock(&state, (Guchar *)ownerEnc->getCString(), gFalse);
+	memcpy(fileKey, state.buf, 16);
+	aes256DecryptBlock(&state, (Guchar *)ownerEnc->getCString() + 16,
+			   gFalse);
+	memcpy(fileKey + 16, state.buf, 16);
+
+	*ownerPasswordOk = gTrue;
+	return gTrue;
+      }
+    }
+
+    // check the user password
+    if (userPassword) {
+      //~ this is supposed to convert the password to UTF-8 using "SASLprep"
+      userPW = userPassword->getCString();
+      len = userPassword->getLength();
+      if (len > 127) {
+	len = 127;
+      }
+    } else {
+      userPW = "";
+      len = 0;
+    }
+    memcpy(test, userPW, len);
+    memcpy(test + len, userKey->getCString() + 32, 8);
+    sha256(test, len + 8, test);
+    if (encRevision == 6) {
+      r6Hash(test, 32, userPW, len, NULL);
+    }
+    if (!memcmp(test, userKey->getCString(), 32)) {
+
+      // compute the file key from the user password
+      memcpy(test, userPW, len);
+      memcpy(test + len, userKey->getCString() + 40, 8);
+      sha256(test, len + 8, test);
+      if (encRevision == 6) {
+	r6Hash(test, 32, userPW, len, NULL);
+      }
+      aes256KeyExpansion(&state, test, 32);
+      for (i = 0; i < 16; ++i) {
+	state.cbc[i] = 0;
+      }
+      aes256DecryptBlock(&state, (Guchar *)userEnc->getCString(), gFalse);
+      memcpy(fileKey, state.buf, 16);
+      aes256DecryptBlock(&state, (Guchar *)userEnc->getCString() + 16,
+			 gFalse);
+      memcpy(fileKey + 16, state.buf, 16);
+
+      return gTrue; 
+    }
+
+    return gFalse;
+
+  } else {
+
+    // try using the supplied owner password to generate the user password
+    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, keyLength, 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] = (Guchar)(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);
+  }
+}
+
+void Decrypt::r6Hash(Guchar *key, int keyLen, const char *pwd, int pwdLen,
+		     char *userKey) {
+  Guchar key1[64*(127+64+48)];
+  DecryptAESState state128;
+  int n, i, j, k;
+
+  i = 0;
+  while (1) {
+    memcpy(key1, pwd, pwdLen);
+    memcpy(key1 + pwdLen, key, keyLen);
+    n = pwdLen + keyLen;
+    if (userKey) {
+      memcpy(key1 + pwdLen + keyLen, userKey, 48);
+      n += 48;
+    }
+    for (j = 1; j < 64; ++j) {
+      memcpy(key1 + j * n, key1, n);
+    }
+    n *= 64;
+    aesKeyExpansion(&state128, key, 16, gFalse);
+    for (j = 0; j < 16; ++j) {
+      state128.cbc[j] = key[16+j];
+    }
+    for (j = 0; j < n; j += 16) {
+      aesEncryptBlock(&state128, key1 + j);
+      memcpy(key1 + j, state128.buf, 16);
+    }
+    k = 0;
+    for (j = 0; j < 16; ++j) {
+      k += key1[j] % 3;
+    }
+    k %= 3;
+    switch (k) {
+    case 0:
+      sha256(key1, n, key);
+      keyLen = 32;
+      break;
+    case 1:
+      sha384(key1, n, key);
+      keyLen = 48;
+      break;
+    case 2:
+      sha512(key1, n, key);
+      keyLen = 64;
+      break;
+    }
+    // from the spec, it appears that i should be incremented after
+    // the test, but that doesn't match what Adobe does
+    ++i;
+    if (i >= 64 && key1[n - 1] <= i - 32) {
+      break;
+    }
+  }
+}
+
+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] = (Guchar)(permissions & 0xff);
+  buf[65] = (Guchar)((permissions >> 8) & 0xff);
+  buf[66] = (Guchar)((permissions >> 16) & 0xff);
+  buf[67] = (Guchar)((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] = (Guchar)(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;
+}
+
+//------------------------------------------------------------------------
+// DecryptStream
+//------------------------------------------------------------------------
+
+DecryptStream::DecryptStream(Stream *strA, Guchar *fileKeyA,
+			     CryptAlgorithm algoA, int keyLengthA,
+			     int objNumA, int objGenA):
+  FilterStream(strA)
+{
+  int i;
+
+  memcpy(fileKey, fileKeyA, keyLengthA);
+  algo = algoA;
+  keyLength = keyLengthA;
+  objNum = objNumA;
+  objGen = objGenA;
+
+  // construct object key
+  for (i = 0; i < keyLength; ++i) {
+    objKey[i] = fileKey[i];
+  }
+  switch (algo) {
+  case cryptRC4:
+    objKey[keyLength] = (Guchar)(objNum & 0xff);
+    objKey[keyLength + 1] = (Guchar)((objNum >> 8) & 0xff);
+    objKey[keyLength + 2] = (Guchar)((objNum >> 16) & 0xff);
+    objKey[keyLength + 3] = (Guchar)(objGen & 0xff);
+    objKey[keyLength + 4] = (Guchar)((objGen >> 8) & 0xff);
+    md5(objKey, keyLength + 5, objKey);
+    if ((objKeyLength = keyLength + 5) > 16) {
+      objKeyLength = 16;
+    }
+    break;
+  case cryptAES:
+    objKey[keyLength] = (Guchar)(objNum & 0xff);
+    objKey[keyLength + 1] = (Guchar)((objNum >> 8) & 0xff);
+    objKey[keyLength + 2] = (Guchar)((objNum >> 16) & 0xff);
+    objKey[keyLength + 3] = (Guchar)(objGen & 0xff);
+    objKey[keyLength + 4] = (Guchar)((objGen >> 8) & 0xff);
+    objKey[keyLength + 5] = 0x73; // 's'
+    objKey[keyLength + 6] = 0x41; // 'A'
+    objKey[keyLength + 7] = 0x6c; // 'l'
+    objKey[keyLength + 8] = 0x54; // 'T'
+    md5(objKey, keyLength + 9, objKey);
+    if ((objKeyLength = keyLength + 5) > 16) {
+      objKeyLength = 16;
+    }
+    break;
+  case cryptAES256:
+    objKeyLength = keyLength;
+    break;
+  }
+}
+
+DecryptStream::~DecryptStream() {
+  delete str;
+}
+
+Stream *DecryptStream::copy() {
+  return new DecryptStream(str->copy(), fileKey, algo, keyLength,
+			   objNum, objGen);
+}
+
+void DecryptStream::reset() {
+  str->reset();
+  switch (algo) {
+  case cryptRC4:
+    state.rc4.x = state.rc4.y = 0;
+    rc4InitKey(objKey, objKeyLength, state.rc4.state);
+    state.rc4.buf = EOF;
+    break;
+  case cryptAES:
+    aesKeyExpansion(&state.aes, objKey, objKeyLength, gTrue);
+    str->getBlock((char *)state.aes.cbc, 16);
+    state.aes.bufIdx = 16;
+    break;
+  case cryptAES256:
+    aes256KeyExpansion(&state.aes256, objKey, objKeyLength);
+    str->getBlock((char *)state.aes256.cbc, 16);
+    state.aes256.bufIdx = 16;
+    break;
+  }
+}
+
+int DecryptStream::getChar() {
+  Guchar in[16];
+  int c;
+
+  c = EOF; // make gcc happy
+  switch (algo) {
+  case cryptRC4:
+    if (state.rc4.buf == EOF) {
+      c = str->getChar();
+      if (c != EOF) {
+	state.rc4.buf = rc4DecryptByte(state.rc4.state, &state.rc4.x,
+				       &state.rc4.y, (Guchar)c);
+      }
+    }
+    c = state.rc4.buf;
+    state.rc4.buf = EOF;
+    break;
+  case cryptAES:
+    if (state.aes.bufIdx == 16) {
+      if (str->getBlock((char *)in, 16) != 16) {
+	return EOF;
+      }
+      aesDecryptBlock(&state.aes, in, str->lookChar() == EOF);
+    }
+    if (state.aes.bufIdx == 16) {
+      c = EOF;
+    } else {
+      c = state.aes.buf[state.aes.bufIdx++];
+    }
+    break;
+  case cryptAES256:
+    if (state.aes256.bufIdx == 16) {
+      if (str->getBlock((char *)in, 16) != 16) {
+	return EOF;
+      }
+      aes256DecryptBlock(&state.aes256, in, str->lookChar() == EOF);
+    }
+    if (state.aes256.bufIdx == 16) {
+      c = EOF;
+    } else {
+      c = state.aes256.buf[state.aes256.bufIdx++];
+    }
+    break;
+  }
+  return c;
+}
+
+int DecryptStream::lookChar() {
+  Guchar in[16];
+  int c;
+
+  c = EOF; // make gcc happy
+  switch (algo) {
+  case cryptRC4:
+    if (state.rc4.buf == EOF) {
+      c = str->getChar();
+      if (c != EOF) {
+	state.rc4.buf = rc4DecryptByte(state.rc4.state, &state.rc4.x,
+				       &state.rc4.y, (Guchar)c);
+      }
+    }
+    c = state.rc4.buf;
+    break;
+  case cryptAES:
+    if (state.aes.bufIdx == 16) {
+      if (str->getBlock((char *)in, 16) != 16) {
+	return EOF;
+      }
+      aesDecryptBlock(&state.aes, in, str->lookChar() == EOF);
+    }
+    if (state.aes.bufIdx == 16) {
+      c = EOF;
+    } else {
+      c = state.aes.buf[state.aes.bufIdx];
+    }
+    break;
+  case cryptAES256:
+    if (state.aes256.bufIdx == 16) {
+      if (str->getBlock((char *)in, 16) != 16) {
+	return EOF;
+      }
+      aes256DecryptBlock(&state.aes256, in, str->lookChar() == EOF);
+    }
+    if (state.aes256.bufIdx == 16) {
+      c = EOF;
+    } else {
+      c = state.aes256.buf[state.aes256.bufIdx];
+    }
+    break;
+  }
+  return c;
+}
+
+GBool DecryptStream::isBinary(GBool last) {
+  return str->isBinary(last);
+}
+
+//------------------------------------------------------------------------
+// RC4-compatible decryption
+//------------------------------------------------------------------------
+
+void rc4InitKey(Guchar *key, int keyLen, Guchar *state) {
+  Guchar index1, index2;
+  Guchar t;
+  int i;
+
+  for (i = 0; i < 256; ++i)
+    state[i] = (Guchar)i;
+  index1 = index2 = 0;
+  for (i = 0; i < 256; ++i) {
+    index2 = (Guchar)(key[index1] + state[i] + index2);
+    t = state[i];
+    state[i] = state[index2];
+    state[index2] = t;
+    index1 = (Guchar)((index1 + 1) % keyLen);
+  }
+}
+
+Guchar rc4DecryptByte(Guchar *state, Guchar *x, Guchar *y, Guchar c) {
+  Guchar x1, y1, tx, ty;
+
+  x1 = *x = (Guchar)(*x + 1);
+  y1 = *y = (Guchar)(state[*x] + *y);
+  tx = state[x1];
+  ty = state[y1];
+  state[x1] = ty;
+  state[y1] = tx;
+  return c ^ state[(tx + ty) % 256];
+}
+
+//------------------------------------------------------------------------
+// AES decryption
+//------------------------------------------------------------------------
+
+static Guchar sbox[256] = {
+  0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
+  0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
+  0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
+  0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
+  0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
+  0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
+  0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
+  0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
+  0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
+  0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
+  0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
+  0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
+  0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
+  0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
+  0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
+  0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
+};
+
+static Guchar invSbox[256] = {
+  0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
+  0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
+  0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
+  0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
+  0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
+  0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
+  0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
+  0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
+  0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
+  0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
+  0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
+  0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
+  0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
+  0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
+  0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
+  0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
+};
+
+static Guint rcon[11] = {
+  0x00000000, // unused
+  0x01000000,
+  0x02000000,
+  0x04000000,
+  0x08000000,
+  0x10000000,
+  0x20000000,
+  0x40000000,
+  0x80000000,
+  0x1b000000,
+  0x36000000
+};
+
+static inline Guint subWord(Guint x) {
+  return (sbox[x >> 24] << 24)
+         | (sbox[(x >> 16) & 0xff] << 16)
+         | (sbox[(x >> 8) & 0xff] << 8)
+         | sbox[x & 0xff];
+}
+
+static inline Guint rotWord(Guint x) {
+  return ((x << 8) & 0xffffffff) | (x >> 24);
+}
+
+static inline void subBytes(Guchar *state) {
+  int i;
+
+  for (i = 0; i < 16; ++i) {
+    state[i] = sbox[state[i]];
+  }
+}
+
+static inline void invSubBytes(Guchar *state) {
+  int i;
+
+  for (i = 0; i < 16; ++i) {
+    state[i] = invSbox[state[i]];
+  }
+}
+
+static inline void shiftRows(Guchar *state) {
+  Guchar t;
+
+  t = state[4];
+  state[4] = state[5];
+  state[5] = state[6];
+  state[6] = state[7];
+  state[7] = t;
+
+  t = state[8];
+  state[8] = state[10];
+  state[10] = t;
+  t = state[9];
+  state[9] = state[11];
+  state[11] = t;
+
+  t = state[15];
+  state[15] = state[14];
+  state[14] = state[13];
+  state[13] = state[12];
+  state[12] = t;
+}
+
+static inline void invShiftRows(Guchar *state) {
+  Guchar t;
+
+  t = state[7];
+  state[7] = state[6];
+  state[6] = state[5];
+  state[5] = state[4];
+  state[4] = t;
+
+  t = state[8];
+  state[8] = state[10];
+  state[10] = t;
+  t = state[9];
+  state[9] = state[11];
+  state[11] = t;
+
+  t = state[12];
+  state[12] = state[13];
+  state[13] = state[14];
+  state[14] = state[15];
+  state[15] = t;
+}
+
+// {02} \cdot s
+static inline Guchar mul02(Guchar s) {
+  Guchar s2;
+
+  s2 = (Guchar)((s & 0x80) ? ((s << 1) ^ 0x1b) : (s << 1));
+  return s2;
+}
+
+// {03} \cdot s
+static inline Guchar mul03(Guchar s) {
+  Guchar s2;
+
+  s2 = (Guchar)((s & 0x80) ? ((s << 1) ^ 0x1b) : (s << 1));
+  return s ^ s2;
+}
+
+// {09} \cdot s
+static inline Guchar mul09(Guchar s) {
+  Guchar s2, s4, s8;
+
+  s2 = (Guchar)((s & 0x80) ? ((s << 1) ^ 0x1b) : (s << 1));
+  s4 = (Guchar)((s2 & 0x80) ? ((s2 << 1) ^ 0x1b) : (s2 << 1));
+  s8 = (Guchar)((s4 & 0x80) ? ((s4 << 1) ^ 0x1b) : (s4 << 1));
+  return s ^ s8;
+}
+
+// {0b} \cdot s
+static inline Guchar mul0b(Guchar s) {
+  Guchar s2, s4, s8;
+
+  s2 = (Guchar)((s & 0x80) ? ((s << 1) ^ 0x1b) : (s << 1));
+  s4 = (Guchar)((s2 & 0x80) ? ((s2 << 1) ^ 0x1b) : (s2 << 1));
+  s8 = (Guchar)((s4 & 0x80) ? ((s4 << 1) ^ 0x1b) : (s4 << 1));
+  return s ^ s2 ^ s8;
+}
+
+// {0d} \cdot s
+static inline Guchar mul0d(Guchar s) {
+  Guchar s2, s4, s8;
+
+  s2 = (Guchar)((s & 0x80) ? ((s << 1) ^ 0x1b) : (s << 1));
+  s4 = (Guchar)((s2 & 0x80) ? ((s2 << 1) ^ 0x1b) : (s2 << 1));
+  s8 = (Guchar)((s4 & 0x80) ? ((s4 << 1) ^ 0x1b) : (s4 << 1));
+  return s ^ s4 ^ s8;
+}
+
+// {0e} \cdot s
+static inline Guchar mul0e(Guchar s) {
+  Guchar s2, s4, s8;
+
+  s2 = (Guchar)((s & 0x80) ? ((s << 1) ^ 0x1b) : (s << 1));
+  s4 = (Guchar)((s2 & 0x80) ? ((s2 << 1) ^ 0x1b) : (s2 << 1));
+  s8 = (Guchar)((s4 & 0x80) ? ((s4 << 1) ^ 0x1b) : (s4 << 1));
+  return s2 ^ s4 ^ s8;
+}
+
+static inline void mixColumns(Guchar *state) {
+  int c;
+  Guchar s0, s1, s2, s3;
+
+  for (c = 0; c < 4; ++c) {
+    s0 = state[c];
+    s1 = state[4+c];
+    s2 = state[8+c];
+    s3 = state[12+c];
+    state[c] =    mul02(s0) ^ mul03(s1) ^       s2  ^       s3;
+    state[4+c] =        s0  ^ mul02(s1) ^ mul03(s2) ^       s3;
+    state[8+c] =        s0  ^       s1  ^ mul02(s2) ^ mul03(s3);
+    state[12+c] = mul03(s0) ^       s1  ^       s2  ^ mul02(s3);
+  }
+}
+
+static inline void invMixColumns(Guchar *state) {
+  int c;
+  Guchar s0, s1, s2, s3;
+
+  for (c = 0; c < 4; ++c) {
+    s0 = state[c];
+    s1 = state[4+c];
+    s2 = state[8+c];
+    s3 = state[12+c];
+    state[c] =    mul0e(s0) ^ mul0b(s1) ^ mul0d(s2) ^ mul09(s3);
+    state[4+c] =  mul09(s0) ^ mul0e(s1) ^ mul0b(s2) ^ mul0d(s3);
+    state[8+c] =  mul0d(s0) ^ mul09(s1) ^ mul0e(s2) ^ mul0b(s3);
+    state[12+c] = mul0b(s0) ^ mul0d(s1) ^ mul09(s2) ^ mul0e(s3);
+  }
+}
+
+static inline void invMixColumnsW(Guint *w) {
+  int c;
+  Guchar s0, s1, s2, s3;
+
+  for (c = 0; c < 4; ++c) {
+    s0 = (Guchar)(w[c] >> 24);
+    s1 = (Guchar)(w[c] >> 16);
+    s2 = (Guchar)(w[c] >> 8);
+    s3 = (Guchar)w[c];
+    w[c] = ((mul0e(s0) ^ mul0b(s1) ^ mul0d(s2) ^ mul09(s3)) << 24)
+           | ((mul09(s0) ^ mul0e(s1) ^ mul0b(s2) ^ mul0d(s3)) << 16)
+           | ((mul0d(s0) ^ mul09(s1) ^ mul0e(s2) ^ mul0b(s3)) << 8)
+           | (mul0b(s0) ^ mul0d(s1) ^ mul09(s2) ^ mul0e(s3));
+  }
+}
+
+static inline void addRoundKey(Guchar *state, Guint *w) {
+  int c;
+
+  for (c = 0; c < 4; ++c) {
+    state[c] ^= (Guchar)(w[c] >> 24);
+    state[4+c] ^= (Guchar)(w[c] >> 16);
+    state[8+c] ^= (Guchar)(w[c] >> 8);
+    state[12+c] ^= (Guchar)w[c];
+  }
+}
+
+void aesKeyExpansion(DecryptAESState *s,
+		     Guchar *objKey, int objKeyLen,
+		     GBool decrypt) {
+  Guint temp;
+  int i, round;
+
+  //~ this assumes objKeyLen == 16
+
+  for (i = 0; i < 4; ++i) {
+    s->w[i] = (objKey[4*i] << 24) + (objKey[4*i+1] << 16) +
+              (objKey[4*i+2] << 8) + objKey[4*i+3];
+  }
+  for (i = 4; i < 44; ++i) {
+    temp = s->w[i-1];
+    if (!(i & 3)) {
+      temp = subWord(rotWord(temp)) ^ rcon[i/4];
+    }
+    s->w[i] = s->w[i-4] ^ temp;
+  }
+  if (decrypt) {
+    for (round = 1; round <= 9; ++round) {
+      invMixColumnsW(&s->w[round * 4]);
+    }
+  }
+}
+
+void aesEncryptBlock(DecryptAESState *s, Guchar *in) {
+  int c, round;
+
+  // initial state + CBC
+  for (c = 0; c < 4; ++c) {
+    s->state[c] = in[4*c] ^ s->cbc[4*c];
+    s->state[4+c] = in[4*c+1] ^ s->cbc[4*c+1];
+    s->state[8+c] = in[4*c+2] ^ s->cbc[4*c+2];
+    s->state[12+c] = in[4*c+3] ^ s->cbc[4*c+3];
+  }
+
+  // round 0
+  addRoundKey(s->state, &s->w[0]);
+
+  // rounds 1 .. 9
+  for (round = 1; round <= 9; ++round) {
+    subBytes(s->state);
+    shiftRows(s->state);
+    mixColumns(s->state);
+    addRoundKey(s->state, &s->w[round * 4]);
+  }
+
+  // round 10
+  subBytes(s->state);
+  shiftRows(s->state);
+  addRoundKey(s->state, &s->w[10 * 4]);
+
+  // output + save for next CBC
+  for (c = 0; c < 4; ++c) {
+    s->buf[4*c] = s->cbc[4*c] = s->state[c];
+    s->buf[4*c+1] = s->cbc[4*c+1] = s->state[4+c];
+    s->buf[4*c+2] = s->cbc[4*c+2] = s->state[8+c];
+    s->buf[4*c+3] = s->cbc[4*c+3] = s->state[12+c];
+  }
+}
+
+void aesDecryptBlock(DecryptAESState *s, Guchar *in, GBool last) {
+  int c, round, n, i;
+
+  // initial state
+  for (c = 0; c < 4; ++c) {
+    s->state[c] = in[4*c];
+    s->state[4+c] = in[4*c+1];
+    s->state[8+c] = in[4*c+2];
+    s->state[12+c] = in[4*c+3];
+  }
+
+  // round 0
+  addRoundKey(s->state, &s->w[10 * 4]);
+
+  // rounds 1-9
+  for (round = 9; round >= 1; --round) {
+    invSubBytes(s->state);
+    invShiftRows(s->state);
+    invMixColumns(s->state);
+    addRoundKey(s->state, &s->w[round * 4]);
+  }
+
+  // round 10
+  invSubBytes(s->state);
+  invShiftRows(s->state);
+  addRoundKey(s->state, &s->w[0]);
+
+  // CBC
+  for (c = 0; c < 4; ++c) {
+    s->buf[4*c] = s->state[c] ^ s->cbc[4*c];
+    s->buf[4*c+1] = s->state[4+c] ^ s->cbc[4*c+1];
+    s->buf[4*c+2] = s->state[8+c] ^ s->cbc[4*c+2];
+    s->buf[4*c+3] = s->state[12+c] ^ s->cbc[4*c+3];
+  }
+
+  // save the input block for the next CBC
+  for (i = 0; i < 16; ++i) {
+    s->cbc[i] = in[i];
+  }
+
+  // remove padding
+  s->bufIdx = 0;
+  if (last) {
+    n = s->buf[15];
+    if (n < 1 || n > 16) { // this should never happen
+      n = 16;
+    }
+    for (i = 15; i >= n; --i) {
+      s->buf[i] = s->buf[i-n];
+    }
+    s->bufIdx = n;
+  }
+}
+
+//------------------------------------------------------------------------
+// AES-256 decryption
+//------------------------------------------------------------------------
+
+static void aes256KeyExpansion(DecryptAES256State *s,
+			       Guchar *objKey, int objKeyLen) {
+  Guint temp;
+  int i, round;
+
+  //~ this assumes objKeyLen == 32
+
+  for (i = 0; i < 8; ++i) {
+    s->w[i] = (objKey[4*i] << 24) + (objKey[4*i+1] << 16) +
+              (objKey[4*i+2] << 8) + objKey[4*i+3];
+  }
+  for (i = 8; i < 60; ++i) {
+    temp = s->w[i-1];
+    if ((i & 7) == 0) {
+      temp = subWord(rotWord(temp)) ^ rcon[i/8];
+    } else if ((i & 7) == 4) {
+      temp = subWord(temp);
+    }
+    s->w[i] = s->w[i-8] ^ temp;
+  }
+  for (round = 1; round <= 13; ++round) {
+    invMixColumnsW(&s->w[round * 4]);
+  }
+}
+
+static void aes256DecryptBlock(DecryptAES256State *s, Guchar *in, GBool last) {
+  int c, round, n, i;
+
+  // initial state
+  for (c = 0; c < 4; ++c) {
+    s->state[c] = in[4*c];
+    s->state[4+c] = in[4*c+1];
+    s->state[8+c] = in[4*c+2];
+    s->state[12+c] = in[4*c+3];
+  }
+
+  // round 0
+  addRoundKey(s->state, &s->w[14 * 4]);
+
+  // rounds 13-1
+  for (round = 13; round >= 1; --round) {
+    invSubBytes(s->state);
+    invShiftRows(s->state);
+    invMixColumns(s->state);
+    addRoundKey(s->state, &s->w[round * 4]);
+  }
+
+  // round 14
+  invSubBytes(s->state);
+  invShiftRows(s->state);
+  addRoundKey(s->state, &s->w[0]);
+
+  // CBC
+  for (c = 0; c < 4; ++c) {
+    s->buf[4*c] = s->state[c] ^ s->cbc[4*c];
+    s->buf[4*c+1] = s->state[4+c] ^ s->cbc[4*c+1];
+    s->buf[4*c+2] = s->state[8+c] ^ s->cbc[4*c+2];
+    s->buf[4*c+3] = s->state[12+c] ^ s->cbc[4*c+3];
+  }
+
+  // save the input block for the next CBC
+  for (i = 0; i < 16; ++i) {
+    s->cbc[i] = in[i];
+  }
+
+  // remove padding
+  s->bufIdx = 0;
+  if (last) {
+    n = s->buf[15];
+    if (n < 1 || n > 16) { // this should never happen
+      n = 16;
+    }
+    for (i = 15; i >= n; --i) {
+      s->buf[i] = s->buf[i-n];
+    }
+    s->bufIdx = n;
+  }
+}
+
+//------------------------------------------------------------------------
+// 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, int 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, int 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, int 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, int s, Gulong Ti) {
+  return b + rotateLeft((a + (c ^ (b | ~d)) + Xk + Ti), s);
+}
+
+void md5Start(MD5State *state) {
+  state->a = 0x67452301;
+  state->b = 0xefcdab89;
+  state->c = 0x98badcfe;
+  state->d = 0x10325476;
+  state->bufLen = 0;
+  state->msgLen = 0;
+}
+
+static void md5ProcessBlock(MD5State *state) {
+  Gulong x[16];
+  Gulong a, b, c, d;
+  int i;
+
+  for (i = 0; i < 16; ++i) {
+    x[i] = state->buf[4*i] | (state->buf[4*i+1] << 8) |
+           (state->buf[4*i+2] << 16) | (state->buf[4*i+3] << 24);
+  }
+
+  a = state->a;
+  b = state->b;
+  c = state->c;
+  d = state->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
+  state->a += a;
+  state->b += b;
+  state->c += c;
+  state->d += d;
+
+  state->bufLen = 0;
+}
+
+void md5Append(MD5State *state, Guchar *data, int dataLen) {
+  Guchar *p;
+  int remain, k;
+
+  p = data;
+  remain = dataLen;
+  while (state->bufLen + remain >= 64) {
+    k = 64 - state->bufLen;
+    memcpy(state->buf + state->bufLen, p, k);
+    state->bufLen = 64;
+    md5ProcessBlock(state);
+    p += k;
+    remain -= k;
+  }
+  if (remain > 0) {
+    memcpy(state->buf + state->bufLen, p, remain);
+    state->bufLen += remain;
+  }
+  state->msgLen += dataLen;
+}
+
+void md5Finish(MD5State *state) {
+  // padding and length
+  state->buf[state->bufLen++] = 0x80;
+  if (state->bufLen > 56) {
+    while (state->bufLen < 64) {
+      state->buf[state->bufLen++] = 0x00;
+    }
+    md5ProcessBlock(state);
+  }      
+  while (state->bufLen < 56) {
+    state->buf[state->bufLen++] = 0x00;
+  }
+  state->buf[56] = (Guchar)(state->msgLen << 3);
+  state->buf[57] = (Guchar)(state->msgLen >> 5);
+  state->buf[58] = (Guchar)(state->msgLen >> 13);
+  state->buf[59] = (Guchar)(state->msgLen >> 21);
+  state->buf[60] = (Guchar)(state->msgLen >> 29);
+  state->buf[61] = (Guchar)0;
+  state->buf[62] = (Guchar)0;
+  state->buf[63] = (Guchar)0;
+  state->bufLen = 64;
+  md5ProcessBlock(state);
+
+  // break digest into bytes
+  state->digest[0] = (Guchar)state->a;
+  state->digest[1] = (Guchar)(state->a >> 8);
+  state->digest[2] = (Guchar)(state->a >> 16);
+  state->digest[3] = (Guchar)(state->a >> 24);
+  state->digest[4] = (Guchar)state->b;
+  state->digest[5] = (Guchar)(state->b >> 8);
+  state->digest[6] = (Guchar)(state->b >> 16);
+  state->digest[7] = (Guchar)(state->b >> 24);
+  state->digest[8] = (Guchar)state->c;
+  state->digest[9] = (Guchar)(state->c >> 8);
+  state->digest[10] = (Guchar)(state->c >> 16);
+  state->digest[11] = (Guchar)(state->c >> 24);
+  state->digest[12] = (Guchar)state->d;
+  state->digest[13] = (Guchar)(state->d >> 8);
+  state->digest[14] = (Guchar)(state->d >> 16);
+  state->digest[15] = (Guchar)(state->d >> 24);
+}
+
+void md5(Guchar *msg, int msgLen, Guchar *digest) {
+  MD5State state;
+  int i;
+
+  if (msgLen < 0) {
+    return;
+  }
+  md5Start(&state);
+  md5Append(&state, msg, msgLen);
+  md5Finish(&state);
+  for (i = 0; i < 16; ++i) {
+    digest[i] = state.digest[i];
+  }
+}
+
+//------------------------------------------------------------------------
+// SHA-256 hash
+//------------------------------------------------------------------------
+
+static Guint sha256K[64] = {
+  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
+  0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+  0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+  0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+  0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+  0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
+  0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+  0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+  0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
+  0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
+  0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+  0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+  0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+};
+
+static inline Guint rotr(Guint x, Guint n) {
+  return (x >> n) | (x << (32 - n));
+}
+
+static inline Guint sha256Ch(Guint x, Guint y, Guint z) {
+  return (x & y) ^ (~x & z);
+}
+
+static inline Guint sha256Maj(Guint x, Guint y, Guint z) {
+  return (x & y) ^ (x & z) ^ (y & z);
+}
+
+static inline Guint sha256Sigma0(Guint x) {
+  return rotr(x, 2) ^ rotr(x, 13) ^ rotr(x, 22);
+}
+
+static inline Guint sha256Sigma1(Guint x) {
+  return rotr(x, 6) ^ rotr(x, 11) ^ rotr(x, 25);
+}
+
+static inline Guint sha256sigma0(Guint x) {
+  return rotr(x, 7) ^ rotr(x, 18) ^ (x >> 3);
+}
+
+static inline Guint sha256sigma1(Guint x) {
+  return rotr(x, 17) ^ rotr(x, 19) ^ (x >> 10);
+}
+
+static void sha256HashBlock(Guchar *blk, Guint *H) {
+  Guint W[64];
+  Guint a, b, c, d, e, f, g, h;
+  Guint T1, T2;
+  Guint t;
+
+  // 1. prepare the message schedule
+  for (t = 0; t < 16; ++t) {
+    W[t] = (blk[t*4] << 24) |
+           (blk[t*4 + 1] << 16) |
+           (blk[t*4 + 2] << 8) |
+           blk[t*4 + 3];
+  }
+  for (t = 16; t < 64; ++t) {
+    W[t] = sha256sigma1(W[t-2]) + W[t-7] + sha256sigma0(W[t-15]) + W[t-16];
+  }
+
+  // 2. initialize the eight working variables
+  a = H[0];
+  b = H[1];
+  c = H[2];
+  d = H[3];
+  e = H[4];
+  f = H[5];
+  g = H[6];
+  h = H[7];
+
+  // 3.
+  for (t = 0; t < 64; ++t) {
+    T1 = h + sha256Sigma1(e) + sha256Ch(e,f,g) + sha256K[t] + W[t];
+    T2 = sha256Sigma0(a) + sha256Maj(a,b,c);
+    h = g;
+    g = f;
+    f = e;
+    e = d + T1;
+    d = c;
+    c = b;
+    b = a;
+    a = T1 + T2;
+  }
+
+  // 4. compute the intermediate hash value
+  H[0] += a;
+  H[1] += b;
+  H[2] += c;
+  H[3] += d;
+  H[4] += e;
+  H[5] += f;
+  H[6] += g;
+  H[7] += h;
+}
+
+static void sha256(Guchar *msg, int msgLen, Guchar *hash) {
+  Guchar blk[64];
+  Guint H[8];
+  int blkLen, i;
+
+  H[0] = 0x6a09e667;
+  H[1] = 0xbb67ae85;
+  H[2] = 0x3c6ef372;
+  H[3] = 0xa54ff53a;
+  H[4] = 0x510e527f;
+  H[5] = 0x9b05688c;
+  H[6] = 0x1f83d9ab;
+  H[7] = 0x5be0cd19;
+
+  blkLen = 0;
+  for (i = 0; i + 64 <= msgLen; i += 64) {
+    sha256HashBlock(msg + i, H);
+  }
+  blkLen = msgLen - i;
+  if (blkLen > 0) {
+    memcpy(blk, msg + i, blkLen);
+  }
+
+  // pad the message
+  blk[blkLen++] = 0x80;
+  if (blkLen > 56) {
+    while (blkLen < 64) {
+      blk[blkLen++] = 0;
+    }
+    sha256HashBlock(blk, H);
+    blkLen = 0;
+  }
+  while (blkLen < 56) {
+    blk[blkLen++] = 0;
+  }
+  blk[56] = 0;
+  blk[57] = 0;
+  blk[58] = 0;
+  blk[59] = 0;
+  blk[60] = (Guchar)(msgLen >> 21);
+  blk[61] = (Guchar)(msgLen >> 13);
+  blk[62] = (Guchar)(msgLen >> 5);
+  blk[63] = (Guchar)(msgLen << 3);
+  sha256HashBlock(blk, H);
+
+  // copy the output into the buffer (convert words to bytes)
+  for (i = 0; i < 8; ++i) {
+    hash[i*4]     = (Guchar)(H[i] >> 24);
+    hash[i*4 + 1] = (Guchar)(H[i] >> 16);
+    hash[i*4 + 2] = (Guchar)(H[i] >> 8);
+    hash[i*4 + 3] = (Guchar)H[i];
+  }
+}
+
+//------------------------------------------------------------------------
+// SHA-384 and SHA-512 hashes
+//------------------------------------------------------------------------
+
+typedef unsigned long long SHA512Uint64;
+
+static SHA512Uint64 sha512K[80] = {
+  0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
+  0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
+  0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
+  0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
+  0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
+  0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
+  0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
+  0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
+  0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
+  0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
+  0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
+  0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
+  0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
+  0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
+  0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
+  0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
+  0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
+  0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
+  0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
+  0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
+  0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
+  0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
+  0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
+  0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
+  0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
+  0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
+  0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
+  0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
+  0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
+  0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
+  0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
+  0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
+  0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
+  0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
+  0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
+  0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
+  0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
+  0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
+  0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
+  0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
+};
+
+static inline SHA512Uint64 rotr64(SHA512Uint64 x, Guint n) {
+  return (x >> n) | (x << (64 - n));
+}
+
+static inline SHA512Uint64 sha512Ch(SHA512Uint64 x, SHA512Uint64 y,
+				    SHA512Uint64 z) {
+  return (x & y) ^ (~x & z);
+}
+
+static inline SHA512Uint64 sha512Maj(SHA512Uint64 x, SHA512Uint64 y,
+				     SHA512Uint64 z) {
+  return (x & y) ^ (x & z) ^ (y & z);
+}
+
+static inline SHA512Uint64 sha512Sigma0(SHA512Uint64 x) {
+  return rotr64(x, 28) ^ rotr64(x, 34) ^ rotr64(x, 39);
+}
+
+static inline SHA512Uint64 sha512Sigma1(SHA512Uint64 x) {
+  return rotr64(x, 14) ^ rotr64(x, 18) ^ rotr64(x, 41);
+}
+
+static inline SHA512Uint64 sha512sigma0(SHA512Uint64 x) {
+  return rotr64(x, 1) ^ rotr64(x, 8) ^ (x >> 7);
+}
+
+static inline SHA512Uint64 sha512sigma1(SHA512Uint64 x) {
+  return rotr64(x, 19) ^ rotr64(x, 61) ^ (x >> 6);
+}
+
+static void sha512HashBlock(Guchar *blk, SHA512Uint64 *H) {
+  SHA512Uint64 W[80];
+  SHA512Uint64 a, b, c, d, e, f, g, h;
+  SHA512Uint64 T1, T2;
+  Guint t;
+
+  // 1. prepare the message schedule
+  for (t = 0; t < 16; ++t) {
+    W[t] = ((SHA512Uint64)blk[t*8] << 56) |
+           ((SHA512Uint64)blk[t*8 + 1] << 48) |
+           ((SHA512Uint64)blk[t*8 + 2] << 40) |
+           ((SHA512Uint64)blk[t*8 + 3] << 32) |
+           ((SHA512Uint64)blk[t*8 + 4] << 24) |
+           ((SHA512Uint64)blk[t*8 + 5] << 16) |
+           ((SHA512Uint64)blk[t*8 + 6] << 8) |
+           (SHA512Uint64)blk[t*8 + 7];
+  }
+  for (t = 16; t < 80; ++t) {
+    W[t] = sha512sigma1(W[t-2]) + W[t-7] + sha512sigma0(W[t-15]) + W[t-16];
+  }
+
+  // 2. initialize the eight working variables
+  a = H[0];
+  b = H[1];
+  c = H[2];
+  d = H[3];
+  e = H[4];
+  f = H[5];
+  g = H[6];
+  h = H[7];
+
+  // 3.
+  for (t = 0; t < 80; ++t) {
+    T1 = h + sha512Sigma1(e) + sha512Ch(e,f,g) + sha512K[t] + W[t];
+    T2 = sha512Sigma0(a) + sha512Maj(a,b,c);
+    h = g;
+    g = f;
+    f = e;
+    e = d + T1;
+    d = c;
+    c = b;
+    b = a;
+    a = T1 + T2;
+  }
+
+  // 4. compute the intermediate hash value
+  H[0] += a;
+  H[1] += b;
+  H[2] += c;
+  H[3] += d;
+  H[4] += e;
+  H[5] += f;
+  H[6] += g;
+  H[7] += h;
+}
+
+static void sha512(Guchar *msg, int msgLen, Guchar *hash) {
+  Guchar blk[128];
+  SHA512Uint64 H[8];
+  int blkLen, i;
+
+  H[0] = 0x6a09e667f3bcc908LL;
+  H[1] = 0xbb67ae8584caa73bLL;
+  H[2] = 0x3c6ef372fe94f82bLL;
+  H[3] = 0xa54ff53a5f1d36f1LL;
+  H[4] = 0x510e527fade682d1LL;
+  H[5] = 0x9b05688c2b3e6c1fLL;
+  H[6] = 0x1f83d9abfb41bd6bLL;
+  H[7] = 0x5be0cd19137e2179LL;
+
+  blkLen = 0;
+  for (i = 0; i + 128 <= msgLen; i += 128) {
+    sha512HashBlock(msg + i, H);
+  }
+  blkLen = msgLen - i;
+  if (blkLen > 0) {
+    memcpy(blk, msg + i, blkLen);
+  }
+
+  // pad the message
+  blk[blkLen++] = 0x80;
+  if (blkLen > 112) {
+    while (blkLen < 128) {
+      blk[blkLen++] = 0;
+    }
+    sha512HashBlock(blk, H);
+    blkLen = 0;
+  }
+  while (blkLen < 112) {
+    blk[blkLen++] = 0;
+  }
+  blk[112] = 0;
+  blk[113] = 0;
+  blk[114] = 0;
+  blk[115] = 0;
+  blk[116] = 0;
+  blk[117] = 0;
+  blk[118] = 0;
+  blk[119] = 0;
+  blk[120] = 0;
+  blk[121] = 0;
+  blk[122] = 0;
+  blk[123] = 0;
+  blk[124] = (Guchar)(msgLen >> 21);
+  blk[125] = (Guchar)(msgLen >> 13);
+  blk[126] = (Guchar)(msgLen >> 5);
+  blk[127] = (Guchar)(msgLen << 3);
+  sha512HashBlock(blk, H);
+
+  // copy the output into the buffer (convert words to bytes)
+  for (i = 0; i < 8; ++i) {
+    hash[i*8]     = (Guchar)(H[i] >> 56);
+    hash[i*8 + 1] = (Guchar)(H[i] >> 48);
+    hash[i*8 + 2] = (Guchar)(H[i] >> 40);
+    hash[i*8 + 3] = (Guchar)(H[i] >> 32);
+    hash[i*8 + 4] = (Guchar)(H[i] >> 24);
+    hash[i*8 + 5] = (Guchar)(H[i] >> 16);
+    hash[i*8 + 6] = (Guchar)(H[i] >> 8);
+    hash[i*8 + 7] = (Guchar)H[i];
+  }
+}
+
+static void sha384(Guchar *msg, int msgLen, Guchar *hash) {
+  Guchar blk[128];
+  SHA512Uint64 H[8];
+  int blkLen, i;
+
+  H[0] = 0xcbbb9d5dc1059ed8LL;
+  H[1] = 0x629a292a367cd507LL;
+  H[2] = 0x9159015a3070dd17LL;
+  H[3] = 0x152fecd8f70e5939LL;
+  H[4] = 0x67332667ffc00b31LL;
+  H[5] = 0x8eb44a8768581511LL;
+  H[6] = 0xdb0c2e0d64f98fa7LL;
+  H[7] = 0x47b5481dbefa4fa4LL;
+
+  blkLen = 0;
+  for (i = 0; i + 128 <= msgLen; i += 128) {
+    sha512HashBlock(msg + i, H);
+  }
+  blkLen = msgLen - i;
+  if (blkLen > 0) {
+    memcpy(blk, msg + i, blkLen);
+  }
+
+  // pad the message
+  blk[blkLen++] = 0x80;
+  if (blkLen > 112) {
+    while (blkLen < 128) {
+      blk[blkLen++] = 0;
+    }
+    sha512HashBlock(blk, H);
+    blkLen = 0;
+  }
+  while (blkLen < 112) {
+    blk[blkLen++] = 0;
+  }
+  blk[112] = 0;
+  blk[113] = 0;
+  blk[114] = 0;
+  blk[115] = 0;
+  blk[116] = 0;
+  blk[117] = 0;
+  blk[118] = 0;
+  blk[119] = 0;
+  blk[120] = 0;
+  blk[121] = 0;
+  blk[122] = 0;
+  blk[123] = 0;
+  blk[124] = (Guchar)(msgLen >> 21);
+  blk[125] = (Guchar)(msgLen >> 13);
+  blk[126] = (Guchar)(msgLen >> 5);
+  blk[127] = (Guchar)(msgLen << 3);
+  sha512HashBlock(blk, H);
+
+  // copy the output into the buffer (convert words to bytes)
+  for (i = 0; i < 6; ++i) {
+    hash[i*8]     = (Guchar)(H[i] >> 56);
+    hash[i*8 + 1] = (Guchar)(H[i] >> 48);
+    hash[i*8 + 2] = (Guchar)(H[i] >> 40);
+    hash[i*8 + 3] = (Guchar)(H[i] >> 32);
+    hash[i*8 + 4] = (Guchar)(H[i] >> 24);
+    hash[i*8 + 5] = (Guchar)(H[i] >> 16);
+    hash[i*8 + 6] = (Guchar)(H[i] >> 8);
+    hash[i*8 + 7] = (Guchar)H[i];
+  }
+}