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Add comments and copyright notices.
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Stephen Heumann
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50
aes.asm
50
aes.asm
@ -1,6 +1,33 @@
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* Copyright (c) 2017 Stephen Heumann
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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* AES encryption and decryption functions for the 65816
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*
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* The general approach is largely based on the public domain
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* 'aestable.c' implementation by Karl Malbrain, available at:
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* https://code.google.com/archive/p/byte-oriented-aes/downloads
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* Portions are also based on the public domain 'rijndael-alg-fst.c'
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* reference implementation by Vincent Rijmen, Antoon Bosselaers,
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* and Paulo Barreto.
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case on
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mcopy aes.macros
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* Data tables used for AES encryption and decryption.
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* For best performance, these should be page-aligned.
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align 256
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tables privdata
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Sbox anop ; forward s-box
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@ -181,6 +208,7 @@ Rcon anop
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dc h'ab 1b 40'
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end
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* Direct page locations
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state1 gequ 0
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state2 gequ 16
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keysize gequ 32
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@ -192,7 +220,11 @@ keysize_192 gequ 64
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keysize_256 gequ 128
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* Callable from C, with state structure pointer on stack.
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* AES key expansion functions
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* The appropriate one of these must be called before encrypting or decrypting.
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* The key should be in the first 16/24/32 bytes of rk before calling this.
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* Callable from C, with context structure pointer on stack.
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aes128_expandkey start
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CFunction AES128_EXPANDKEY
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end
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@ -205,7 +237,7 @@ aes256_expandkey start
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CFunction AES256_EXPANDKEY
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end
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* Call with DP = AES state structure (with key expanded),
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* Call with DP = AES context structure (with key present but not expanded),
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* DB = bank containing AES tables.
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AES128_EXPANDKEY start
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using tables
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@ -281,13 +313,17 @@ done rtl
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end
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* Callable from C, with state structure pointer on stack.
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* AES encryption function
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* This performs AES-128, AES-192, or AES-256 encryption, depending on the key.
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* The unencrypted input and encrypted output are in state1.
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* Callable from C, with context structure pointer on stack.
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aes_encrypt start
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CFunction AES_ENCRYPT
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end
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* Call with DP = AES state structure (with key expanded),
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* Call with DP = AES context structure (with key expanded),
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* DP = bank containing AES tables.
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AES_ENCRYPT start
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using tables
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@ -337,6 +373,10 @@ finish_aes128 anop
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end
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* AES decryption functions
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* The encrypted input and unencrypted output are in state1.
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* Callable from C, with context structure pointer on stack.
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aes128_decrypt start
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CFunction AES128_DECRYPT
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end
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@ -349,6 +389,8 @@ aes256_decrypt start
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CFunction AES256_DECRYPT
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end
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* Call with DP = AES context structure (with key expanded),
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* DP = bank containing AES tables.
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AES256_DECRYPT start
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using tables
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ShortRegs
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47
aes.h
47
aes.h
@ -1,3 +1,19 @@
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/*
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* Copyright (c) 2017 Stephen Heumann
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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struct aes_context {
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unsigned char data[16];
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unsigned char reserved1[17];
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@ -5,13 +21,28 @@ struct aes_context {
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unsigned char reserved2[16*13];
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};
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/* context must be in bank 0, preferably page-aligned. */
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void aes128_expandkey(struct aes_context *);
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void aes128_expandkey(struct aes_context *);
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void aes128_expandkey(struct aes_context *);
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/* The context structure must be in bank 0, preferably page-aligned. */
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void aes_encrypt(struct aes_context *);
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/*
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* AES key expansion functions
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* The appropriate one of these must be called before encrypting or decrypting.
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* The key must be in the first 16/24/32 bytes of context->key before the call.
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*/
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void aes128_expandkey(struct aes_context *context);
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void aes192_expandkey(struct aes_context *context);
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void aes256_expandkey(struct aes_context *context);
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void aes128_decrypt(struct aes_context *);
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void aes192_decrypt(struct aes_context *);
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void aes256_decrypt(struct aes_context *);
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/*
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* AES encryption function
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* This performs AES-128, AES-192, or AES-256 encryption, depending on the key.
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* The unencrypted input and encrypted output are in context->data.
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*/
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void aes_encrypt(struct aes_context *context);
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/*
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* AES decryption functions
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* The encrypted input and unencrypted output are in context->data.
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*/
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void aes128_decrypt(struct aes_context *context);
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void aes192_decrypt(struct aes_context *context);
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void aes256_decrypt(struct aes_context *context);
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41
aes.macros
41
aes.macros
@ -1,3 +1,17 @@
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* Copyright (c) 2017 Stephen Heumann
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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* This makes a function wrapper that is callable from C,
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* taking a pointer to the state structure as its argument.
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macro
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@ -18,7 +32,7 @@
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rtl
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mend
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*The 'core' function applied to some words when computing the AES key schedule
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macro
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ExpandKeyCore &xorback,&rconoffset
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@ -79,7 +93,7 @@
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mend
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* Generate consecutive words of key schedule that don't use above functions
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macro
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ExpandKeyIter &xorback,&nwords
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lcla &i
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@ -99,7 +113,7 @@
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aif &i/4<&nwords,.loop2
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mend
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* Do an initial AddRoundKey step on the starting state (for encryption)
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macro
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AddInitialRoundKey
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lcla &i
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@ -111,7 +125,7 @@
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aif &i<16,.top
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mend
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* Do a full normal round, including (in effect) SubBytes through AddRoundKey
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macro
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&lbl NormalRound &round
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&lbl anop
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@ -129,7 +143,7 @@
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.done
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mend
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* Do the operations on one column for a normal round.
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macro
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MixColumn &i,&A,&B,&C,&D,&state,&out
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@ -183,7 +197,7 @@
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.skip2
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mend
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* Do final round, including (in effect) SubBytes, ShiftRows, and AddRoundKey.
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macro
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FinalRound &round
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@ -209,7 +223,7 @@
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mend
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* Do the final round operations for one byte.
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macro
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FinalRoundStep &to,&from,&skipldy
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@ -228,7 +242,7 @@
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mend
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* Perform an inverse normal round (for decryption)
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macro
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InvNormalRound &round,&state
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lcla &i
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@ -250,7 +264,7 @@
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InvMixColumn 4,9,14,3,4,dotax=1
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mend
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* Perform the operations for one column in an inverse normal round
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macro
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InvMixColumn &A,&B,&C,&D,&i,&skipldx,&dotax
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@ -311,7 +325,7 @@
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.done
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mend
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* Do the inverse final round steps for one byte.
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macro
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InvFinalRoundStep &to,&from,&dotax
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@ -341,7 +355,7 @@
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.done
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mend
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* Do the inverse of the final round (which comes first for decryption).
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macro
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InvFinalRound &round
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@ -367,7 +381,7 @@
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mend
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* Set registers to 8 bits
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macro
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ShortRegs
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sep #$30
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longi off
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mend
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* Set registers to 16 bits
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macro
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LongRegs
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rep #$30
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longa on
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longi on
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mend
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16
aestest.c
16
aestest.c
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/*
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* Copyright (c) 2017 Stephen Heumann
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <MiscTool.h>
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#include <Memory.h>
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