Generating SHA1 get bad hash

Projects Programming
1

Hi, I need generate hash of string.
I found this library. For cycle is from this file.

#include <sha1.h>
void setup () { Serial.begin(9600); } 
void loop() {
  delay(5000);

  char tmp[41];  
  memset(tmp, 0, 41);

  Sha1.init();
  Sha1.print("abc");  
  uint8_t *hash = Sha1.result();
  for (int i=0; i<20; i++) {
    tmp[i*2] = "0123456789abcdef"[hash[i]>>4];
    tmp[i*2+1] = "0123456789abcdef"[hash[i]&0xf];
  }
  
  Serial.println(tmp);
}

This code send string over RS-232:

a9993e364706816aba3e25717850c26c9cd0d89d

but if I create sha1 hash of the same string on my linux computer I get different hash:

$ echo "abc" | sha1sum 
03cfd743661f07975fa2f1220c5194cbaff48451  -

But in documentainon autor wrote it is good.
What I do bad?

I do not need exactly sha1, any other hash (for example md5) is good for me too.

2

It is working fine on the Arduino, but not on Linux. That is because on Linux you are hashing a different string.

On the Arduino you are hashing "abc". On Linux you are hashing "abc\n" - echo adds a line ending.

If you use "echo -n" it stops it adding the line ending:

$ echo -n abc | sha1sum 
a9993e364706816aba3e25717850c26c9cd0d89d  -
3

Thank you. Now it is good.