85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <read_rand.h>
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#define MTK_SIP_KERNEL_GET_RND 0x8200026A
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// Function to print a single line of the hexdump
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static void print_hexdump_line(const unsigned char *buffer, int bytes_read, int offset)
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{
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// Print the offset
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printf("%08x ", offset);
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// Print the hex representation
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for (int i = 0; i < 16; i++) {
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if (i < bytes_read) {
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printf("%02x ", buffer[i]);
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} else {
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printf(" ");
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}
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// Print an extra space between groups of 8 bytes
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if (i == 7) {
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printf(" ");
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}
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}
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printf(" |");
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// Print the ASCII representation
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for (int i = 0; i < bytes_read; i++) {
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if (buffer[i] >= 32 && buffer[i] <= 126) {
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printf("%c", buffer[i]);
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} else {
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printf(".");
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}
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}
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printf("|\n");
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}
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// Function to perform hexdump on a given buffer
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static void hexdump(const unsigned char *buffer, size_t size)
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{
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int offset = 0;
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while (size > 0) {
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int bytes_to_print = size > 16 ? 16 : size;
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print_hexdump_line(buffer, bytes_to_print, offset);
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buffer += bytes_to_print;
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offset += bytes_to_print;
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size -= bytes_to_print;
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}
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}
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int main(int argc, char *argv[])
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{
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int rc;
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uint8_t buf[1024] = { };
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int rand_len;
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if (argc < 2) {
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fprintf(stderr, "USAGE: %s <rand length>\n", argv[0]);
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return 1;
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}
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rand_len = atoi(argv[1]);
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if (rand_len < 0 || rand_len > (int) sizeof(buf)) {
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fprintf(stderr, "rand length must be between 0 and 1024\n");
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return 1;
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}
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rc = read_hwrandom(buf, (size_t) rand_len);
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if (rc != 0) {
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fprintf(stderr, "read hwrandom failed with %d\n", rc);
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return 1;
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}
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hexdump(buf, (size_t) rand_len);
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return 0;
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}
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