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65816-crypto
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90 Commits

Author SHA1 Message Date
Stephen Heumann cfadee23bb Add implementation and test for AES CTR mode. 2017-07-02 18:25:43 -05:00
Stephen Heumann 924789510b Optimize AES CBC operations a bit. 2017-07-02 16:24:00 -05:00
Stephen Heumann 6532a3abc4 Add timing tests for AES CBC encryption and decryption. 2017-07-02 15:56:22 -05:00
Stephen Heumann c8b0fb904b Add .gitignore file. 2017-07-02 15:29:51 -05:00
Stephen Heumann 4e0903a708 Add simple toy program for encrypting/decrypting files with AES. 2017-07-02 15:24:49 -05:00
Stephen Heumann 60a7aec49c Add functions for AES CBC mode encryption and decryption. 2017-07-01 23:29:17 -05:00
Stephen Heumann 0386f928ff Add comments and copyright notices, and rename chunk to block. 2017-07-01 17:53:49 -05:00
Stephen Heumann b2d3d3ffa8 Add sha1sum program as a test/application of the SHA-1 computation. 2017-07-01 15:11:13 -05:00
Stephen Heumann 0ad5d39f07 Tweaks to SHA-1 update and finalization code. 2017-07-01 14:27:25 -05:00
Stephen Heumann 8b17a15ada Add implementations of the SHA-1 update and finalize operations. 
The definition of the context structure is also cleaned up a bit.
 2017-06-30 23:55:03 -05:00
Stephen Heumann 3aa0d1b89f Update SHA-1 test program. 2017-06-30 13:35:33 -05:00
Stephen Heumann 97fc1ce981 Small cleanups in SHA-1. 2017-06-30 13:23:29 -05:00
Stephen Heumann 6c1d703b84 Don't duplicate identical code for the last three schedule computation phases. 
This shrinks code size and is probably faster with accelerators due to caching.
 2017-06-30 12:49:51 -05:00
Stephen Heumann d97e0c0153 Don't update index value in each unrolled loop iteration. 2017-06-30 00:52:25 -05:00
Stephen Heumann 2d8c85bd98 Unroll SHA-1 loop with variables substituted to avoid cycling values around. 
SHA-1 has five state variables (a,b,c,d,e), and each iteration of the core loop cycles their values around (e.g. a->b), in some cases with modifications. By unrolling the loop by a factor of five and appropriately substituting the values operated on in each iteration, we can avoid actually doing the copies implied by this cycling, which gives a fairly significant performance gain.
 2017-06-30 00:33:16 -05:00
Stephen Heumann aab47e38e7 Compute SHA-1 message schedule 20 elements at a time, reusing storage. 
The reduces the storage needed and boosts performance, since the whole schedule is contained in the direct page.
 2017-06-29 22:22:06 -05:00
Stephen Heumann 7182fc5817 Use separate loops for the four parts of the SHA-1 computation. 2017-06-29 20:51:36 -05:00
Stephen Heumann dfdb3186fd Add macros for rotates. 2017-06-29 20:41:49 -05:00
Stephen Heumann ad4e0a0dd5 More SHA-1 optimizations. 2017-06-29 20:16:22 -05:00
Stephen Heumann 13654c0888 Small optimizations in SHA-1 computation. 2017-06-29 19:52:52 -05:00
Stephen Heumann a519776847 Add implementation of the basic block-processing function for SHA-1. 2017-06-29 16:54:49 -05:00
Stephen Heumann 1cb8841a46 state -> context 2017-06-29 16:52:34 -05:00
Stephen Heumann f60585cc3e Add note about context size. 2017-06-28 01:26:24 -05:00
Stephen Heumann d4baf7dbe4 Usage message and indentation cleanups in test program. 2017-06-27 23:42:20 -05:00
Stephen Heumann 4ffd064204 Add comments and copyright notices. 2017-06-27 23:30:58 -05:00
Stephen Heumann e46264f0c4 Small decryption optimization, saving a value in a register between rounds. 2017-06-27 22:35:57 -05:00
Stephen Heumann 634ff1e865 Optimize decryption code. 
AddRoundKey is integrated into InvMixColumn and InvFinalRoundStep, rather than being done separately.
 2017-06-27 20:44:14 -05:00
Stephen Heumann 18dabeb621 Allow number of test iters to be given on command line. 2017-06-27 20:07:07 -05:00
Stephen Heumann d9b8467bb7 Rename some interfaces. 2017-06-27 19:42:53 -05:00
Stephen Heumann 14fe68de79 Time decryption as well as encryption. 2017-06-27 19:35:38 -05:00
Stephen Heumann a522ab6d88 Optimize decryption a bit. 2017-06-27 19:24:06 -05:00
Stephen Heumann 46fcb3badc Add support for AES-256 decryption. 2017-06-27 18:35:04 -05:00
Stephen Heumann 0e3e511ba8 Add basic decryption implementation for AES-128 and AES-192. 2017-06-27 18:17:00 -05:00
Stephen Heumann 9d9f62444d Add timing test. 2017-06-27 12:45:58 -05:00
Stephen Heumann 4314644e75 Update to also support AES-192 and AES-256. 2017-06-27 01:36:56 -05:00
Stephen Heumann 293828584f Optimize key expansion a bit, removing unnecessary loads. 2017-06-26 22:22:55 -05:00
Stephen Heumann f04000c83d Save a few cycles by not reloading the last written byte between rounds. 2017-06-26 21:49:16 -05:00
Stephen Heumann 75aac0daa9 Save a couple values on the stack rather than looking them up again. 
This is cycle-neutral (assuming a page-aligned DP), but it reduces instruction bytes and therefore may give a speedup on accelerators with caches.
 2017-06-26 21:13:25 -05:00
Stephen Heumann 301021e75e Cut out a few instructions by reusing subexpressions in registers. 2017-06-26 20:53:17 -05:00
Stephen Heumann 3df0080371 Initial working implementation of AES-128 encryption. 2017-06-26 20:41:44 -05:00