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Diffstat (limited to 'kpdf/xpdf/xpdf/Decrypt.cc')
-rw-r--r-- | kpdf/xpdf/xpdf/Decrypt.cc | 776 |
1 files changed, 0 insertions, 776 deletions
diff --git a/kpdf/xpdf/xpdf/Decrypt.cc b/kpdf/xpdf/xpdf/Decrypt.cc deleted file mode 100644 index 51e56fb1..00000000 --- a/kpdf/xpdf/xpdf/Decrypt.cc +++ /dev/null @@ -1,776 +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 aesKeyExpansion(DecryptAESState *s, - Guchar *objKey, int objKeyLen); -static void aesDecryptBlock(DecryptAESState *s, Guchar *in, GBool last); -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 -//------------------------------------------------------------------------ - -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; -} - -//------------------------------------------------------------------------ -// DecryptStream -//------------------------------------------------------------------------ - -DecryptStream::DecryptStream(Stream *strA, Guchar *fileKey, - CryptAlgorithm algoA, int keyLength, - int objNum, int objGen): - FilterStream(strA) -{ - int n, i; - - algo = algoA; - - // 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; - if (algo == cryptAES) { - objKey[keyLength + 5] = 0x73; // 's' - objKey[keyLength + 6] = 0x41; // 'A' - objKey[keyLength + 7] = 0x6c; // 'l' - objKey[keyLength + 8] = 0x54; // 'T' - n = keyLength + 9; - } else { - n = keyLength + 5; - } - md5(objKey, n, objKey); - if ((objKeyLength = keyLength + 5) > 16) { - objKeyLength = 16; - } -} - -DecryptStream::~DecryptStream() { - delete str; -} - -void DecryptStream::reset() { - int i; - - 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); - for (i = 0; i < 16; ++i) { - state.aes.cbc[i] = str->getChar(); - } - state.aes.bufIdx = 16; - break; - } -} - -int DecryptStream::getChar() { - Guchar in[16]; - int c, i; - - 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) { - for (i = 0; i < 16; ++i) { - if ((c = str->getChar()) == EOF) { - return EOF; - } - in[i] = (Guchar)c; - } - aesDecryptBlock(&state.aes, in, str->lookChar() == EOF); - } - if (state.aes.bufIdx == 16) { - c = EOF; - } else { - c = state.aes.buf[state.aes.bufIdx++]; - } - break; - } - return c; -} - -int DecryptStream::lookChar() { - Guchar in[16]; - int c, i; - - 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) { - for (i = 0; i < 16; ++i) { - if ((c = str->getChar()) == EOF) { - return EOF; - } - in[i] = c; - } - aesDecryptBlock(&state.aes, in, str->lookChar() == EOF); - } - if (state.aes.bufIdx == 16) { - c = EOF; - } else { - c = state.aes.buf[state.aes.bufIdx]; - } - break; - } - return c; -} - -GBool DecryptStream::isBinary(GBool last) { - return str->isBinary(last); -} - -//------------------------------------------------------------------------ -// 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]; -} - -//------------------------------------------------------------------------ -// 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 invSubBytes(Guchar *state) { - int i; - - for (i = 0; i < 16; ++i) { - state[i] = invSbox[state[i]]; - } -} - -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; -} - -// {09} \cdot s -static inline Guchar mul09(Guchar s) { - Guchar s2, s4, s8; - - s2 = (s & 0x80) ? ((s << 1) ^ 0x1b) : (s << 1); - s4 = (s2 & 0x80) ? ((s2 << 1) ^ 0x1b) : (s2 << 1); - s8 = (s4 & 0x80) ? ((s4 << 1) ^ 0x1b) : (s4 << 1); - return s ^ s8; -} - -// {0b} \cdot s -static inline Guchar mul0b(Guchar s) { - Guchar s2, s4, s8; - - s2 = (s & 0x80) ? ((s << 1) ^ 0x1b) : (s << 1); - s4 = (s2 & 0x80) ? ((s2 << 1) ^ 0x1b) : (s2 << 1); - s8 = (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 = (s & 0x80) ? ((s << 1) ^ 0x1b) : (s << 1); - s4 = (s2 & 0x80) ? ((s2 << 1) ^ 0x1b) : (s2 << 1); - s8 = (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 = (s & 0x80) ? ((s << 1) ^ 0x1b) : (s << 1); - s4 = (s2 & 0x80) ? ((s2 << 1) ^ 0x1b) : (s2 << 1); - s8 = (s4 & 0x80) ? ((s4 << 1) ^ 0x1b) : (s4 << 1); - return s2 ^ s4 ^ s8; -} - -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 = w[c] >> 24; - s1 = w[c] >> 16; - s2 = w[c] >> 8; - s3 = 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] ^= w[c] >> 24; - state[4+c] ^= w[c] >> 16; - state[8+c] ^= w[c] >> 8; - state[12+c] ^= w[c]; - } -} - -static void aesKeyExpansion(DecryptAESState *s, - Guchar *objKey, int /*objKeyLen*/) { - 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; - } - for (round = 1; round <= 9; ++round) { - invMixColumnsW(&s->w[round * 4]); - } -} - -static 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]; - 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, 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); -} |