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hex string to byte array, C
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unsigned char* hexstr_to_char(const char* hexstr) | |
{ | |
size_t len = strlen(hexstr); | |
IF_ASSERT(len % 2 != 0) | |
return NULL; | |
size_t final_len = len / 2; | |
unsigned char* chrs = (unsigned char*)malloc((final_len+1) * sizeof(*chrs)); | |
for (size_t i=0, j=0; j<final_len; i+=2, j++) | |
chrs[j] = (hexstr[i] % 32 + 9) % 25 * 16 + (hexstr[i+1] % 32 + 9) % 25; | |
chrs[final_len] = '\0'; | |
return chrs; | |
} |
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