diff options
Diffstat (limited to 'idea.c')
| -rw-r--r-- | idea.c | 45 |
1 files changed, 24 insertions, 21 deletions
@@ -20,30 +20,32 @@ ** */ +/* Following constant defines the max number of loops the +** system will attempt. Keeps things from going off into the +** weeds. */ +/*#define LOOP_MAX 50000L*/ +#define LOOP_MAX 500000L + /* -** DEFINES +** Following constant sets the size of the arrays. +** NOTE: For the IDEA algorithm to work properly, this +** number MUST be some multiple of 8. */ +#define ARRAY_SIZE 4000 + #define IDEAKEYSIZE 16 #define IDEABLOCKSIZE 8 #define ROUNDS 8 #define KEYLEN (6*ROUNDS+4) -/* -** MACROS -*/ #define low16(x) ((x) & 0x0FFFF) #define MUL(x,y) (x=mul(low16(x),y)) - typedef uint16_t IDEAkey[KEYLEN]; -/* -** PROTOTYPES -*/ static clock_t DoIDEAIteration(unsigned char *plain1, unsigned char *crypt1, unsigned char *plain2, - unsigned long arraysize, unsigned long nloops, - IDEAkey Z, IDEAkey DK); + unsigned long nloops, IDEAkey Z, IDEAkey DK); static uint16_t mul(register uint16_t a, register uint16_t b); static uint16_t inv(uint16_t x); static void en_key_idea(uint16_t userkey[8], IDEAkey Z); @@ -70,6 +72,7 @@ DoIDEA(void) uint16_t userkey[8]; int i; static int is_adjusted = FALSE; + static int loops = 100; randnum(3); @@ -96,20 +99,20 @@ DoIDEA(void) ** So, plain1 and plain2 should match. ** Also, fill up plain1 with sample text. */ - plain1 = malloc(locideastruct->arraysize); + plain1 = malloc(ARRAY_SIZE); if (!plain1) { fprintf(stderr, "Error in %s, could not allocate memory. Exitting...\n", context); exit(1); } - crypt1 = malloc(locideastruct->arraysize); + crypt1 = malloc(ARRAY_SIZE); if (!crypt1) { fprintf(stderr, "Error in %s, could not allocate memory. Exitting...\n", context); free(plain1); exit(1); } - plain2 = malloc(locideastruct->arraysize); + plain2 = malloc(ARRAY_SIZE); if (!plain2) { fprintf(stderr, "Error in %s, could not allocate memory. Exitting...\n", context); free(plain1); @@ -120,7 +123,7 @@ DoIDEA(void) ** Note that we build the "plaintext" by simply loading ** the array up with random numbers. */ - for (i = 0;i < locideastruct->arraysize; i++) { + for (i = 0;i < ARRAY_SIZE; i++) { plain1[i] = (unsigned char)(abs_randwc(255) & 0xFF); } @@ -134,8 +137,8 @@ DoIDEA(void) ** # of loops and increasing the loop count until we ** get a number of loops that we can use. */ - for (locideastruct->loops = 100; locideastruct->loops < MAXIDEALOOPS; locideastruct->loops += 10) { - if (DoIDEAIteration(plain1, crypt1, plain2, locideastruct->arraysize, locideastruct->loops, Z, DK) > MINIMUM_TICKS) { + for (; loops < LOOP_MAX; loops += 10) { + if (DoIDEAIteration(plain1, crypt1, plain2, loops, Z, DK) > MINIMUM_TICKS) { break; } } @@ -146,8 +149,8 @@ DoIDEA(void) */ do { - total_time += DoIDEAIteration(plain1, crypt1, plain2, locideastruct->arraysize, locideastruct->loops, Z, DK); - iterations += locideastruct->loops; + total_time += DoIDEAIteration(plain1, crypt1, plain2, loops, Z, DK); + iterations += loops; } while (total_time < MINIMUM_SECONDS * CLOCKS_PER_SEC); free(plain1); @@ -165,7 +168,7 @@ DoIDEA(void) ** decryption. */ static clock_t -DoIDEAIteration(unsigned char *plain1, unsigned char *crypt1, unsigned char *plain2, unsigned long arraysize, unsigned long nloops, IDEAkey Z, IDEAkey DK) +DoIDEAIteration(unsigned char *plain1, unsigned char *crypt1, unsigned char *plain2, unsigned long nloops, IDEAkey Z, IDEAkey DK) { clock_t start, stop; register unsigned long i; @@ -174,12 +177,12 @@ DoIDEAIteration(unsigned char *plain1, unsigned char *crypt1, unsigned char *pla start = clock(); for (i = 0; i < nloops; i++) { - for (j = 0; j < arraysize; j += sizeof(uint16_t) * 4) { + for (j = 0; j < ARRAY_SIZE; j += sizeof(uint16_t) * 4) { cipher_idea((uint16_t *)(plain1 + j), (uint16_t *)(crypt1 + j), Z); /* Encrypt */ } } - for (j = 0; j < arraysize; j += sizeof(uint16_t) * 4) { + for (j = 0; j < ARRAY_SIZE; j += sizeof(uint16_t) * 4) { cipher_idea((uint16_t *)(crypt1 + j), (uint16_t *)(plain2 + j), DK); /* Decrypt */ } |