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support base32 input with switch -b

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This commit is contained in:
Avi Halachmi (:avih) 2023-10-21 20:09:50 +03:00
parent 908ba9a889
commit 3c412a85c6
2 changed files with 32 additions and 1 deletions
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8
README.md
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@ -16,6 +16,14 @@ As usual, you can customize the destination with `DESTDIR` and `prefix`.
## Usage
$ echo -n JBSWY3DPEHPK3PXP | base32 -d | totp
$ 123456
Or
$ echo JBSWY3DPEHPK3PXP | totp -b
$ 123456
It has been thought for [secret](https://github.com/angt/secret),
maybe it will be directly integrated in a future version, in the meantime:

25
totp.c
View file

@ -1,6 +1,7 @@
// Copyright (c) 2020 by angt <adrien@gallouet.fr>
// Don't try to reuse the HMAC-SHA1 implementation of this project,
// you will suffer unproductively :P
// base32 ignores non-alphabet, doesn't enforce canonical zeros or padding
#include <inttypes.h>
#include <stdio.h>
@ -98,17 +99,39 @@ erase(void *buf, size_t len)
x[i] = 0;
}
static size_t
base32_decode(uint8_t *inout, size_t len)
{
uint8_t *in = inout, *out = inout;
const char *b32 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567", *p;
unsigned v = 0, bits = 0;
for (; len--; in++) {
if (*in && (p = strchr(b32, *in))) {
v = (v << 5) | (unsigned)(p - b32);
if ((bits += 5) >= 8)
*out++ = (uint8_t)(v >> (bits -= 8));
}
}
return (size_t)(out - inout);
}
int
main(int argc, char **argv)
{
uint8_t h[20];
uint8_t ki[64 + 8] = {0};
uint8_t ki[64 + 8];
uint8_t ko[64 + 20] = {0};
ssize_t len = read(0, ki, 64);
if (len > 0 && argc > 1 && argv[1][0] == '-' && argv[1][1] == 'b')
len = (ssize_t)base32_decode(ki, (size_t)len);
if (len <= 0)
return -1;
memset(ki + len, 0, sizeof(ki) - (size_t)len);
memcpy(ko, ki, len);
for (int i = 0; i < 64; i++) {