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Add implementation and test for AES CTR mode.
This commit is contained in:
Stephen Heumann
parent
924789510b
commit
cfadee23bb
15
aes.h
15
aes.h
@ -75,3 +75,18 @@ void aes_cbc_decrypt(struct aes_context *context,
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unsigned char *out,
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unsigned long nblocks,
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const unsigned char *iv);
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/*
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* Process data using AES-128, AES-192, or AES-256 in CTR mode.
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* This either encrypts or decrypts data, depending on whether
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* in contains plaintext or ciphertext.
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* The key must have been specified via aes{128,192,256}_expandkey().
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* nblocks gives the number of 16-byte blocks to be processed.
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* counter will be interpreted as a 128-bit big-endian integer,
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* and incremented for each block processed.
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*/
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void aes_ctr_process(struct aes_context *context,
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const unsigned char *in,
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unsigned char *out,
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unsigned long nblocks,
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const unsigned char *counter);
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126
aesctrtest.c
Normal file
126
aesctrtest.c
Normal file
@ -0,0 +1,126 @@
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <Memory.h>
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#include <MiscTool.h>
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#include <orca.h>
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#include "aes.h"
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unsigned char initial_counter[16] = {
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0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,
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0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff
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};
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unsigned char counter[16];
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unsigned char key128[16] = {
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0x2b,0x7e,0x15,0x16,0x28,0xae,0xd2,0xa6,
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0xab,0xf7,0x15,0x88,0x09,0xcf,0x4f,0x3c
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};
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unsigned char key192[24] = {
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0x8e,0x73,0xb0,0xf7,0xda,0x0e,0x64,0x52,
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0xc8,0x10,0xf3,0x2b,0x80,0x90,0x79,0xe5,
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0x62,0xf8,0xea,0xd2,0x52,0x2c,0x6b,0x7b
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};
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unsigned char key256[32] = {
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0x60,0x3d,0xeb,0x10,0x15,0xca,0x71,0xbe,
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0x2b,0x73,0xae,0xf0,0x85,0x7d,0x77,0x81,
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0x1f,0x35,0x2c,0x07,0x3b,0x61,0x08,0xd7,
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0x2d,0x98,0x10,0xa3,0x09,0x14,0xdf,0xf4
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};
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unsigned char plaintext[64] = {
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0x6b,0xc1,0xbe,0xe2,0x2e,0x40,0x9f,0x96,
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0xe9,0x3d,0x7e,0x11,0x73,0x93,0x17,0x2a,
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0xae,0x2d,0x8a,0x57,0x1e,0x03,0xac,0x9c,
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0x9e,0xb7,0x6f,0xac,0x45,0xaf,0x8e,0x51,
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0x30,0xc8,0x1c,0x46,0xa3,0x5c,0xe4,0x11,
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0xe5,0xfb,0xc1,0x19,0x1a,0x0a,0x52,0xef,
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0xf6,0x9f,0x24,0x45,0xdf,0x4f,0x9b,0x17,
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0xad,0x2b,0x41,0x7b,0xe6,0x6c,0x37,0x10
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};
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unsigned char output[64];
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unsigned char output2[64];
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#define BUFSIZE 64000
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static void printhex(char *str, unsigned char *buf, unsigned int count) {
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unsigned int i;
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if (str)
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printf("%s\n", str);
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for (i = 0; i < count; i++) {
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printf("%02x", buf[i]);
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if (i && (i & 0x0F) == 0x0F)
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printf("\n");
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}
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}
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int main(void) {
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struct aes_context **context_hndl;
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struct aes_context *context;
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unsigned char *inbuf, *outbuf;
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unsigned long tick_count;
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long double bytes_per_sec;
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context_hndl = (struct aes_context **)NewHandle(sizeof(struct aes_context),
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userid(), attrFixed|attrPage|attrBank|attrNoCross, 0x000000);
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if (toolerror())
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return 0;
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context = *context_hndl;
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memcpy(context->key, key128, 16);
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aes128_expandkey(context);
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memcpy(counter, initial_counter, 16);
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aes_ctr_process(context, plaintext, output, 4, counter);
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printhex("AES-128 ciphertext:", output, 64);
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memcpy(counter, initial_counter, 16);
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aes_ctr_process(context, output, output2, 4, counter);
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printhex("Decrypted plaintext:", output2, 64);
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memcpy(context->key, key192, 24);
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aes192_expandkey(context);
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memcpy(counter, initial_counter, 16);
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aes_ctr_process(context, plaintext, output, 4, counter);
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printhex("AES-192 ciphertext:", output, 64);
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memcpy(counter, initial_counter, 16);
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aes_ctr_process(context, output, output2, 4, counter);
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printhex("Decrypted plaintext:", output2, 64);
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memcpy(context->key, key256, 32);
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aes256_expandkey(context);
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memcpy(counter, initial_counter, 16);
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aes_ctr_process(context, plaintext, output, 4, counter);
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printhex("AES-256 ciphertext:", output, 64);
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memcpy(counter, initial_counter, 16);
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aes_ctr_process(context, output, output2, 4, counter);
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printhex("Decrypted plaintext:", output2, 64);
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/* Timing tests */
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inbuf = calloc(BUFSIZE, 1);
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outbuf = malloc(BUFSIZE);
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if (inbuf == NULL || outbuf == NULL)
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return -1;
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memcpy(context->key, key128, 16);
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aes128_expandkey(context);
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memcpy(counter, initial_counter, 16);
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tick_count = GetTick();
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aes_ctr_process(context, inbuf, outbuf, BUFSIZE / 16, counter);
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tick_count = GetTick() - tick_count;
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bytes_per_sec = (long double)BUFSIZE * 60 / tick_count;
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printf("AES-128 CTR encryption/decryption: %lf bytes/sec\n", bytes_per_sec);
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}
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@ -281,3 +281,112 @@ void aes_cbc_decrypt(struct aes_context *context,
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out += 16;
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}
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}
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/*
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* Process data using AES-128, AES-192, or AES-256 in CTR mode.
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* This either encrypts or decrypts data, depending on whether
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* in contains plaintext or ciphertext.
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* The key must have been specified via aes{128,192,256}_expandkey().
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* nblocks gives the number of 16-byte blocks to be processed.
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* counter will be interpreted as a 128-bit big-endian integer,
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* and incremented for each block processed.
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*/
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void aes_ctr_process(struct aes_context *context,
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const unsigned char *in,
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unsigned char *out,
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unsigned long nblocks,
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const unsigned char *counter)
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{
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while (nblocks-- > 0) {
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asm {
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lda [counter]
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sta [context]
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ldy #2
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lda [counter],y
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sta [context],y
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iny
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iny
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lda [counter],y
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sta [context],y
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iny
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iny
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lda [counter],y
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sta [context],y
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iny
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iny
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lda [counter],y
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sta [context],y
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iny
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iny
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lda [counter],y
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sta [context],y
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iny
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iny
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lda [counter],y
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sta [context],y
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iny
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iny
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lda [counter],y
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sta [context],y
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phd
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lda context
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tcd
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jsl AES_ENCRYPT
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pld
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lda [context]
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eor [in]
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sta [out]
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ldy #2
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lda [context],y
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eor [in],y
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sta [out],y
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iny
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iny
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lda [context],y
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eor [in],y
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sta [out],y
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iny
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iny
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lda [context],y
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eor [in],y
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sta [out],y
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iny
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iny
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lda [context],y
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eor [in],y
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sta [out],y
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iny
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iny
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lda [context],y
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eor [in],y
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sta [out],y
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iny
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iny
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lda [context],y
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eor [in],y
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sta [out],y
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iny
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iny
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lda [context],y
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eor [in],y
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sta [out],y
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ldy #14
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incloop: lda [counter],y
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xba
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inc a
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xba
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sta [counter],y
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bne incdone
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dey
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dey
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bpl incloop
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incdone:
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}
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in += 16;
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out += 16;
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}
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}
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