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Difference between revisions of "S5L8720 (Hardware - SHA1)"
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| − | ==S5L8720 SHA-1 Hardware== |
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| − | Base Address: 0x38000000 |
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| + | Haxed by 1337Urmom at The Pois0nhack team |
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| − | ===Programming Guide=== |
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| + | Haxed by 1337Urmom at The Pois0nhack team |
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| − | As there is no real documentation of the hardware (The Samsung S3C6400X seams to use a very similar SHA-1 generator, but not the same), this is based on what [[iBoot]] does and on a lot of trial-and-error. |
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| + | Haxed by 1337Urmom at The Pois0nhack team |
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| − | ====How it works==== |
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| − | Basically it is like a hardware version of a SHA-1 algorithm. The hardware processes data in 512Bit (64 Bytes) chunks (Just like a software algorithm). <br> |
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| + | Haxed by 1337Urmom at The Pois0nhack team |
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| − | It does NO pre-processing (appending a '1' Bit to the data, pad the data so that the length mod 512 is 448, and append the bit-length of the data as a 64-bit big-endian integer). <br> |
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| − | This has to be done in software. |
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| + | Haxed by 1337Urmom at The Pois0nhack team |
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| − | ====Calculating the SHA-1 of a message==== |
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| + | Haxed by 1337Urmom at The Pois0nhack team |
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| − | # Prepare the message as usual. See [http://en.wikipedia.org/wiki/SHA_hash_functions Wikipedia on SHA] |
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| − | # Switch on the clock for the SHA-1 generator |
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| − | # Reset the generator. To do this set bit 0 of reset register and clear it afterwards (iBoot waits until the hash is ready before resetting it) |
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| − | # Clear (Write 0) to the Configuration Register (Not sure if this is needed as it already reads 0 after resetting, but iBoot does it) |
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| − | # Clear register 0x80 and 0x10 (Also not sure why, as they also read 0) |
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| − | # Write 64 bytes of the message to the data input registers starting at the lowest |
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| − | # If this were the the first 64 bytes clear bit 3 in the Configuration register, else set it |
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| − | # Set bit 1 (Start Hash) of the Configuration register and wait until bit 0 (Hash Busy) is cleared |
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| − | # If more data to hash go to point 6 |
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| − | # Read the calculated hash of the Output SHA-1 Hash registers |
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| − | # Switch off the clock |
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| + | Haxed by 1337Urmom at The Pois0nhack team |
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| − | ==Registers== |
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| − | ===Register Summary=== |
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| − | <table border=1 width=100%> |
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| − | <tr> |
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| − | <td align=left width=100pix><b>Register</b></td> |
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| − | <td><b>Description</b></td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>0x00</td> |
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| − | <td align=left>Configuration</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>0x04</td> |
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| − | <td align=left>Reset</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>0x08</td> |
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| − | <td align=left>Unknown, but referenced in iBoot</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>0x0C</td> |
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| − | <td align=left>Unknown, but referenced in iBoot</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>0x10</td> |
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| − | <td align=left>Unknown, but referenced in iBoot (Set to 0 before calculating a hash)</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>0x20 - 0x30</td> |
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| − | <td align=left>Output SHA-1 hash / Input Initialization Vector</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>0x40 - 0x7C</td> |
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| − | <td align=left>Data Input (64 Bytes)</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>0x80</td> |
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| − | <td align=left>Unknown, but referenced in iBoot (Set to 0 before calculating a hash)</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>0x84</td> |
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| − | <td align=left>Unknown, but referenced in iBoot</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>0x8C</td> |
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| − | <td align=left>Unknown, but referenced in iBoot</td> |
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| − | </tr> |
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| − | </table> |
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| + | Haxed by 1337Urmom at The Pois0nhack team |
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| − | ===Configuration Register=== |
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| − | <table border=1 width=100%> |
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| − | <tr> |
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| − | <td align=left width=100pix><b>Bit</b></td> |
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| − | <td><b>Function</b></td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>Bit 0</td> |
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| − | <td align=left>Hash Busy. Is set when the hash calculation is started and cleared when the generator is done.</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>Bit 1</td> |
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| − | <td align=left>Start Hash. Set to 1 to start hashing of the data in the Input Data registers.</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>Bit 2</td> |
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| − | <td align=left>Unknown</td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>Bit 3</td> |
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| − | <td align=left>Config IV. Use arbitary IV (=1), Use SHA-1 constants (=0) (Used for starting a new hash (=0), or continue a previous one (=1)).</td> |
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| − | </tr> |
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| − | </table> |
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| − | All other bits are unknown or not used |
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| − | ===Reset Register=== |
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| − | <table border=1 width=100%> |
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| − | <tr> |
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| − | <td align=left width=100pix><b>Bit</b></td> |
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| − | <td><b>Function</b></td> |
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| − | </tr> |
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| − | <tr> |
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| − | <td align=left width=100pix>Bit 0</td> |
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| − | <td align=left>Reset Hash. Resets the generator and all registers.</td> |
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| − | </tr> |
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| − | </table> |
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| − | All other bits are unknown or not used |
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| + | Haxed by 1337Urmom at The Pois0nhack team |
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| − | ===Hash Out / IV In=== |
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| − | Read: Outputs the hash in little-endian <br> |
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| − | Write: Set the initialization vectors |
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| − | ===Data Input=== |
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| − | Read: Read what was previously written there (like normal RAM) <br> |
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| − | Write: The current 64 byte data chunk to calculate the hash of. (little-endian) |
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| + | vv |
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Revision as of 06:33, 7 November 2009
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