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37 lines
1.0 KiB
37 lines
1.0 KiB
#include "common.h"
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void ecdaa_rand(void *buffer, size_t buflen) {
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getrandom(buffer, buflen, 0);
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}
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char bin2hex(uint8_t byte) {
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uint8_t word = byte & 0x0f;
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char hex = 0;
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if (word >= 0 && word <= 9) hex = word + '0';
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else if (word >= 10 && word <= 15) hex = word - 10 + 'A';
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return hex;
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}
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uint8_t hex2bin(char hex) {
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uint8_t byte = 0;
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if (hex >= '0' && hex <= '9') byte = hex - '0';
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else if (hex >= 'a' && hex <= 'f') byte = hex - 'a' + 10;
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else if (hex >= 'A' && hex <= 'F') byte = hex - 'A' + 10;
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return byte;
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}
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void ecdaa_hextobin(const char *in_hex, uint8_t *out_bin, size_t outlen) {
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for (size_t i = 0, j = 0; i < outlen; i++, j+=2) {
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uint8_t val = hex2bin(in_hex[j]);
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val += hex2bin(in_hex[j+1]) * 16;
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out_bin[i] = (char) val;
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}
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}
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void ecdaa_bintohex(const uint8_t *in_bin, size_t inlen, char *out_hex) {
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for (size_t i = 0, j = 0; i < inlen; i++, j+=2) {
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out_hex[j] = bin2hex(in_bin[i]);
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out_hex[j+1] = bin2hex(in_bin[i] >> 4);
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}
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}
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