From 18aa8ad2ba543a8473c6ab798d8c41894d277add Mon Sep 17 00:00:00 2001 From: Filippos Karapetis Date: Mon, 28 Dec 2015 03:30:55 +0200 Subject: Revert "MT32: Add SHA1 file digest checking in getROMInfo()" This reverts commit 908d2f39d7579c3f1781f7dedc7b26366a6d3dfc. The licence of the SHA1 code that munt is using is unclear. Reverting until it's sorted properly, for now --- audio/softsynth/mt32/ROMInfo.cpp | 22 +- audio/softsynth/mt32/sha1/sha1.cpp | 591 ------------------------------------- audio/softsynth/mt32/sha1/sha1.h | 93 ------ 3 files changed, 4 insertions(+), 702 deletions(-) delete mode 100644 audio/softsynth/mt32/sha1/sha1.cpp delete mode 100644 audio/softsynth/mt32/sha1/sha1.h (limited to 'audio/softsynth') diff --git a/audio/softsynth/mt32/ROMInfo.cpp b/audio/softsynth/mt32/ROMInfo.cpp index 8851817eeb..7c0127078b 100644 --- a/audio/softsynth/mt32/ROMInfo.cpp +++ b/audio/softsynth/mt32/ROMInfo.cpp @@ -17,7 +17,6 @@ //#include #include "ROMInfo.h" -#include "sha1/sha1.h" namespace MT32Emu { @@ -53,27 +52,14 @@ static const ROMInfo *getKnownROMInfoFromList(unsigned int index) { return ROM_INFOS[index]; } -static void getSHA1(Common::File *file, char *fileDigest) { - size_t fileSize = file->size(); - byte *data = new byte[fileSize]; - file->read(data, fileSize); - file->seek(0); - SHA1 sha1; - uint intDigest[5]; - sha1.Input((const char *)data, fileSize); - if (sha1.Result(intDigest)) - sprintf(fileDigest, "%08x%08x%08x%08x%08x", intDigest[0], intDigest[1], intDigest[2], intDigest[3], intDigest[4]); - delete[] data; -} - const ROMInfo* ROMInfo::getROMInfo(Common::File *file) { size_t fileSize = file->size(); - char fileDigest[41]; // Includes terminator char - getSHA1(file, fileDigest); - + // We haven't added the SHA1 checksum code in ScummVM, as the file size + // suffices for our needs for now. + //const char *fileDigest = file->getSHA1(); for (int i = 0; getKnownROMInfoFromList(i) != NULL; i++) { const ROMInfo *romInfo = getKnownROMInfoFromList(i); - if (fileSize == romInfo->fileSize && !strcmp(fileDigest, romInfo->sha1Digest)) { + if (fileSize == romInfo->fileSize /*&& !strcmp(fileDigest, romInfo->sha1Digest)*/) { return romInfo; } } diff --git a/audio/softsynth/mt32/sha1/sha1.cpp b/audio/softsynth/mt32/sha1/sha1.cpp deleted file mode 100644 index 5f8fd3e032..0000000000 --- a/audio/softsynth/mt32/sha1/sha1.cpp +++ /dev/null @@ -1,591 +0,0 @@ -/* - * sha1.cpp - * - * Copyright (C) 1998, 2009 - * Paul E. Jones - * All Rights Reserved. - * - ***************************************************************************** - * $Id: sha1.cpp 12 2009-06-22 19:34:25Z paulej $ - ***************************************************************************** - * - * Description: - * This class implements the Secure Hashing Standard as defined - * in FIPS PUB 180-1 published April 17, 1995. - * - * The Secure Hashing Standard, which uses the Secure Hashing - * Algorithm (SHA), produces a 160-bit message digest for a - * given data stream. In theory, it is highly improbable that - * two messages will produce the same message digest. Therefore, - * this algorithm can serve as a means of providing a "fingerprint" - * for a message. - * - * Portability Issues: - * SHA-1 is defined in terms of 32-bit "words". This code was - * written with the expectation that the processor has at least - * a 32-bit machine word size. If the machine word size is larger, - * the code should still function properly. One caveat to that - * is that the input functions taking characters and character arrays - * assume that only 8 bits of information are stored in each character. - * - * Caveats: - * SHA-1 is designed to work with messages less than 2^64 bits long. - * Although SHA-1 allows a message digest to be generated for - * messages of any number of bits less than 2^64, this implementation - * only works with messages with a length that is a multiple of 8 - * bits. - * - */ - - -#include "sha1.h" - -using namespace MT32Emu; - -/* - * SHA1 - * - * Description: - * This is the constructor for the sha1 class. - * - * Parameters: - * None. - * - * Returns: - * Nothing. - * - * Comments: - * - */ -SHA1::SHA1() -{ - Reset(); -} - -/* - * ~SHA1 - * - * Description: - * This is the destructor for the sha1 class - * - * Parameters: - * None. - * - * Returns: - * Nothing. - * - * Comments: - * - */ -SHA1::~SHA1() -{ - // The destructor does nothing -} - -/* - * Reset - * - * Description: - * This function will initialize the sha1 class member variables - * in preparation for computing a new message digest. - * - * Parameters: - * None. - * - * Returns: - * Nothing. - * - * Comments: - * - */ -void SHA1::Reset() -{ - Length_Low = 0; - Length_High = 0; - Message_Block_Index = 0; - - H[0] = 0x67452301; - H[1] = 0xEFCDAB89; - H[2] = 0x98BADCFE; - H[3] = 0x10325476; - H[4] = 0xC3D2E1F0; - - Computed = false; - Corrupted = false; -} - -/* - * Result - * - * Description: - * This function will return the 160-bit message digest into the - * array provided. - * - * Parameters: - * message_digest_array: [out] - * This is an array of five unsigned integers which will be filled - * with the message digest that has been computed. - * - * Returns: - * True if successful, false if it failed. - * - * Comments: - * - */ -bool SHA1::Result(unsigned *message_digest_array) -{ - int i; // Counter - - if (Corrupted) - { - return false; - } - - if (!Computed) - { - PadMessage(); - Computed = true; - } - - for(i = 0; i < 5; i++) - { - message_digest_array[i] = H[i]; - } - - return true; -} - -/* - * Input - * - * Description: - * This function accepts an array of octets as the next portion of - * the message. - * - * Parameters: - * message_array: [in] - * An array of characters representing the next portion of the - * message. - * - * Returns: - * Nothing. - * - * Comments: - * - */ -void SHA1::Input( const unsigned char *message_array, - unsigned length) -{ - if (!length) - { - return; - } - - if (Computed || Corrupted) - { - Corrupted = true; - return; - } - - while(length-- && !Corrupted) - { - Message_Block[Message_Block_Index++] = (*message_array & 0xFF); - - Length_Low += 8; - Length_Low &= 0xFFFFFFFF; // Force it to 32 bits - if (Length_Low == 0) - { - Length_High++; - Length_High &= 0xFFFFFFFF; // Force it to 32 bits - if (Length_High == 0) - { - Corrupted = true; // Message is too long - } - } - - if (Message_Block_Index == 64) - { - ProcessMessageBlock(); - } - - message_array++; - } -} - -/* - * Input - * - * Description: - * This function accepts an array of octets as the next portion of - * the message. - * - * Parameters: - * message_array: [in] - * An array of characters representing the next portion of the - * message. - * length: [in] - * The length of the message_array - * - * Returns: - * Nothing. - * - * Comments: - * - */ -void SHA1::Input( const char *message_array, - unsigned length) -{ - Input((unsigned char *) message_array, length); -} - -/* - * Input - * - * Description: - * This function accepts a single octets as the next message element. - * - * Parameters: - * message_element: [in] - * The next octet in the message. - * - * Returns: - * Nothing. - * - * Comments: - * - */ -void SHA1::Input(unsigned char message_element) -{ - Input(&message_element, 1); -} - -/* - * Input - * - * Description: - * This function accepts a single octet as the next message element. - * - * Parameters: - * message_element: [in] - * The next octet in the message. - * - * Returns: - * Nothing. - * - * Comments: - * - */ -void SHA1::Input(char message_element) -{ - Input((unsigned char *) &message_element, 1); -} - -/* - * operator<< - * - * Description: - * This operator makes it convenient to provide character strings to - * the SHA1 object for processing. - * - * Parameters: - * message_array: [in] - * The character array to take as input. - * - * Returns: - * A reference to the SHA1 object. - * - * Comments: - * Each character is assumed to hold 8 bits of information. - * - */ -SHA1& SHA1::operator<<(const char *message_array) -{ - const char *p = message_array; - - while(*p) - { - Input(*p); - p++; - } - - return *this; -} - -/* - * operator<< - * - * Description: - * This operator makes it convenient to provide character strings to - * the SHA1 object for processing. - * - * Parameters: - * message_array: [in] - * The character array to take as input. - * - * Returns: - * A reference to the SHA1 object. - * - * Comments: - * Each character is assumed to hold 8 bits of information. - * - */ -SHA1& SHA1::operator<<(const unsigned char *message_array) -{ - const unsigned char *p = message_array; - - while(*p) - { - Input(*p); - p++; - } - - return *this; -} - -/* - * operator<< - * - * Description: - * This function provides the next octet in the message. - * - * Parameters: - * message_element: [in] - * The next octet in the message - * - * Returns: - * A reference to the SHA1 object. - * - * Comments: - * The character is assumed to hold 8 bits of information. - * - */ -SHA1& SHA1::operator<<(const char message_element) -{ - Input((unsigned char *) &message_element, 1); - - return *this; -} - -/* - * operator<< - * - * Description: - * This function provides the next octet in the message. - * - * Parameters: - * message_element: [in] - * The next octet in the message - * - * Returns: - * A reference to the SHA1 object. - * - * Comments: - * The character is assumed to hold 8 bits of information. - * - */ -SHA1& SHA1::operator<<(const unsigned char message_element) -{ - Input(&message_element, 1); - - return *this; -} - -/* - * ProcessMessageBlock - * - * Description: - * This function will process the next 512 bits of the message - * stored in the Message_Block array. - * - * Parameters: - * None. - * - * Returns: - * Nothing. - * - * Comments: - * Many of the variable names in this function, especially the single - * character names, were used because those were the names used - * in the publication. - * - */ -void SHA1::ProcessMessageBlock() -{ - const unsigned K[] = { // Constants defined for SHA-1 - 0x5A827999, - 0x6ED9EBA1, - 0x8F1BBCDC, - 0xCA62C1D6 - }; - int t; // Loop counter - unsigned temp; // Temporary word value - unsigned W[80]; // Word sequence - unsigned A, B, C, D, E; // Word buffers - - /* - * Initialize the first 16 words in the array W - */ - for(t = 0; t < 16; t++) - { - W[t] = ((unsigned) Message_Block[t * 4]) << 24; - W[t] |= ((unsigned) Message_Block[t * 4 + 1]) << 16; - W[t] |= ((unsigned) Message_Block[t * 4 + 2]) << 8; - W[t] |= ((unsigned) Message_Block[t * 4 + 3]); - } - - for(t = 16; t < 80; t++) - { - W[t] = CircularShift(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]); - } - - A = H[0]; - B = H[1]; - C = H[2]; - D = H[3]; - E = H[4]; - - for(t = 0; t < 20; t++) - { - temp = CircularShift(5,A) + ((B & C) | ((~B) & D)) + E + W[t] + K[0]; - temp &= 0xFFFFFFFF; - E = D; - D = C; - C = CircularShift(30,B); - B = A; - A = temp; - } - - for(t = 20; t < 40; t++) - { - temp = CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[1]; - temp &= 0xFFFFFFFF; - E = D; - D = C; - C = CircularShift(30,B); - B = A; - A = temp; - } - - for(t = 40; t < 60; t++) - { - temp = CircularShift(5,A) + - ((B & C) | (B & D) | (C & D)) + E + W[t] + K[2]; - temp &= 0xFFFFFFFF; - E = D; - D = C; - C = CircularShift(30,B); - B = A; - A = temp; - } - - for(t = 60; t < 80; t++) - { - temp = CircularShift(5,A) + (B ^ C ^ D) + E + W[t] + K[3]; - temp &= 0xFFFFFFFF; - E = D; - D = C; - C = CircularShift(30,B); - B = A; - A = temp; - } - - H[0] = (H[0] + A) & 0xFFFFFFFF; - H[1] = (H[1] + B) & 0xFFFFFFFF; - H[2] = (H[2] + C) & 0xFFFFFFFF; - H[3] = (H[3] + D) & 0xFFFFFFFF; - H[4] = (H[4] + E) & 0xFFFFFFFF; - - Message_Block_Index = 0; -} - -/* - * PadMessage - * - * Description: - * According to the standard, the message must be padded to an even - * 512 bits. The first padding bit must be a '1'. The last 64 bits - * represent the length of the original message. All bits in between - * should be 0. This function will pad the message according to those - * rules by filling the message_block array accordingly. It will also - * call ProcessMessageBlock() appropriately. When it returns, it - * can be assumed that the message digest has been computed. - * - * Parameters: - * None. - * - * Returns: - * Nothing. - * - * Comments: - * - */ -void SHA1::PadMessage() -{ - /* - * Check to see if the current message block is too small to hold - * the initial padding bits and length. If so, we will pad the - * block, process it, and then continue padding into a second block. - */ - if (Message_Block_Index > 55) - { - Message_Block[Message_Block_Index++] = 0x80; - while(Message_Block_Index < 64) - { - Message_Block[Message_Block_Index++] = 0; - } - - ProcessMessageBlock(); - - while(Message_Block_Index < 56) - { - Message_Block[Message_Block_Index++] = 0; - } - } - else - { - Message_Block[Message_Block_Index++] = 0x80; - while(Message_Block_Index < 56) - { - Message_Block[Message_Block_Index++] = 0; - } - - } - - /* - * Store the message length as the last 8 octets - */ - Message_Block[56] = (Length_High >> 24) & 0xFF; - Message_Block[57] = (Length_High >> 16) & 0xFF; - Message_Block[58] = (Length_High >> 8) & 0xFF; - Message_Block[59] = (Length_High) & 0xFF; - Message_Block[60] = (Length_Low >> 24) & 0xFF; - Message_Block[61] = (Length_Low >> 16) & 0xFF; - Message_Block[62] = (Length_Low >> 8) & 0xFF; - Message_Block[63] = (Length_Low) & 0xFF; - - ProcessMessageBlock(); -} - - -/* - * CircularShift - * - * Description: - * This member function will perform a circular shifting operation. - * - * Parameters: - * bits: [in] - * The number of bits to shift (1-31) - * word: [in] - * The value to shift (assumes a 32-bit integer) - * - * Returns: - * The shifted value. - * - * Comments: - * - */ -unsigned SHA1::CircularShift(int bits, unsigned word) -{ - return ((word << bits) & 0xFFFFFFFF) | ((word & 0xFFFFFFFF) >> (32-bits)); -} diff --git a/audio/softsynth/mt32/sha1/sha1.h b/audio/softsynth/mt32/sha1/sha1.h deleted file mode 100644 index bb1c7ed182..0000000000 --- a/audio/softsynth/mt32/sha1/sha1.h +++ /dev/null @@ -1,93 +0,0 @@ -/* - * sha1.h - * - * Copyright (C) 1998, 2009 - * Paul E. Jones - * All Rights Reserved. - * - ***************************************************************************** - * $Id: sha1.h 12 2009-06-22 19:34:25Z paulej $ - ***************************************************************************** - * - * Description: - * This class implements the Secure Hashing Standard as defined - * in FIPS PUB 180-1 published April 17, 1995. - * - * Many of the variable names in this class, especially the single - * character names, were used because those were the names used - * in the publication. - * - * Please read the file sha1.cpp for more information. - * - */ - -#ifndef _SHA1_H_ -#define _SHA1_H_ - -namespace MT32Emu { - -class SHA1 -{ - - public: - - SHA1(); - virtual ~SHA1(); - - /* - * Re-initialize the class - */ - void Reset(); - - /* - * Returns the message digest - */ - bool Result(unsigned *message_digest_array); - - /* - * Provide input to SHA1 - */ - void Input( const unsigned char *message_array, - unsigned length); - void Input( const char *message_array, - unsigned length); - void Input(unsigned char message_element); - void Input(char message_element); - SHA1& operator<<(const char *message_array); - SHA1& operator<<(const unsigned char *message_array); - SHA1& operator<<(const char message_element); - SHA1& operator<<(const unsigned char message_element); - - private: - - /* - * Process the next 512 bits of the message - */ - void ProcessMessageBlock(); - - /* - * Pads the current message block to 512 bits - */ - void PadMessage(); - - /* - * Performs a circular left shift operation - */ - inline unsigned CircularShift(int bits, unsigned word); - - unsigned H[5]; // Message digest buffers - - unsigned Length_Low; // Message length in bits - unsigned Length_High; // Message length in bits - - unsigned char Message_Block[64]; // 512-bit message blocks - int Message_Block_Index; // Index into message block array - - bool Computed; // Is the digest computed? - bool Corrupted; // Is the message digest corruped? - -}; - -} // namespace MT32Emu - -#endif // #ifndef _SHA1_H_ -- cgit v1.2.3