Ripemd160 hash in C program.

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I wrote a c program to calculate ripemd160 hash on a 64-byte char array.But it give me the wrong output. This is my code:

<pre>#include <stdio.h>
#include <string.h>
 #include <openssl/ripemd.h>
int main (void) {
	 unsigned char s[7] = "37a0df85d5ccf7cb5f92b53aa3f223d76c115a844ed52d8978deecd2ecb3e406";
	unsigned long n=20;
	unsigned char *d;


	 unsigned char *RIPEMD160(const unsigned char *s, unsigned long n,
                  unsigned char *d);
 
	int i;
	for (i = 0; i < 20; i++)
		printf("%02x", d[i]);
	putchar('\n');
 
	return 0;
}

can anyone tell me where am I am going wrong?

output for this code is:

31ed4989d15e4889e24883e4f050544c8d059a01

but the correct output should be:

4ecc9d3eea56b0af96b6db612b76911858dcb40d

What I have tried:

#include <stdio.h>
#include <string.h>
 #include <openssl/ripemd.h>
int main (void) {
	 unsigned char s[7] = "37a0df85d5ccf7cb5f92b53aa3f223d76c115a844ed52d8978deecd2ecb3e406";
	unsigned long n=20;
	unsigned char *d;


	 unsigned char *RIPEMD160(const unsigned char *s, unsigned long n,
                  unsigned char *d);
 
	int i;
	for (i = 0; i < 20; i++)
		printf("%02x", d[i]);
	putchar('\n');
 
	return 0;
}

Posted 20-Mar-20 2:30am

Asish6542165

Updated 20-Mar-20 5:33am

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Comments

Richard MacCutchan 20-Mar-20 9:50am

You are declaring the RIPEMD160 function but you never call it to do the conversion.

Asish6542165 20-Mar-20 10:15am

how can I call it? It should be declared in OpenSSL right? Please tell me how can i do it.

Richard MacCutchan 20-Mar-20 10:41am

The same way you call any function. Look at the documentation, set the correct parameters, and capture any response data. You have also declared the array s as only 7 characters, so that code should not even compile. I cannot understand where you are getting result values from.

Asish6542165 20-Mar-20 10:47am

can you give me some c code to perform ripemd160 hash on a char array in c language? It would be really helpful. please

Richard MacCutchan 20-Mar-20 11:12am

It is all explained here: ripemd(3): RIPEMD-160 hash function - Linux man page[^].

Asish6542165 20-Mar-20 11:25am

it is the same as the OpenSSL "https://www.openssl.org/docs/man1.0.2/man3/RIPEMD160.html" documentation I have gon through it. Can you give me code written in the comment box

Richard MacCutchan 20-Mar-20 11:30am

Are you saying that you don't know how to write a simple function call in C?

Asish6542165 20-Mar-20 11:48am

no. It's kind of confusing. It would be helpful if can provide code.

2 solutions

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CPallini · Accepted Answer · 2020-03-20T03:12:00

Solution 1

Quote:
31ed4989d15e4889e24883e4f050544c8d059a01

If that is the hexadecimal string representation of an array of bytes then you should do something like:

C

unsigned char s[] = { 0x31, 0xed, 0x49, 0x89, ..., 0x01};
unsigned char h[20];
RIPEMD160(s, sizeof(s), h);

(you should replace the ... with the actual numbers, of course).

Posted 20-Mar-20 3:12am

CPallini

Comments

Asish6542165 20-Mar-20 9:21am

this gives an error.

test.c: In function ‘main’:
test.c:9:1: warning: ‘RIPEMD160’ is deprecated [-Wdeprecated-declarations]
9 | RIPEMD160(s, sizeof(s), h);
| ^~~~~~~~~
In file included from /usr/local/include/openssl/opensslv.h:109,
from /usr/local/include/openssl/macros.h:11,
from /usr/local/include/openssl/opensslconf.h:14,
from /usr/local/include/openssl/macros.h:10,
from /usr/local/include/openssl/ripemd.h:14,
from test.c:3:
/usr/local/include/openssl/ripemd.h:49:1: note: declared here
49 | DEPRECATEDIN_3_0(unsigned char *RIPEMD160(const unsigned char *d, size_t n,
| ^~~~~~~~~~~~~~~~

and the string "31ed4989d15e4889e24883e4f050544c8d059a01" is actually a sha256 of another input. I am trying to write a c code to generate bitcoin addresses. I cannot pass it in this unsigned char s[] = { 0x31, 0xed, 0x49, 0x89, ..., 0x01}; way.this string is actually stored in a pointer variable.

Asish6542165 20-Mar-20 11:12am

can you give me some c code to perform ripemd160 hash on a char array in c language? It would be really helpful. please

Richard MacCutchan · Accepted Answer · 2020-03-20T05:34:00

Solution 2

C++

const unsigned char* rawdata = "<add your string data here>";
unsigned long n = strlen(rawdata);
unsigned char md[32];
unsigned char* pmd = RIPEMD160(rawdata, n, md);

Posted 20-Mar-20 5:34am

Richard MacCutchan

Comments

Asish6542165 20-Mar-20 12:24pm

I have tried the same thing but I don't know why it keeps on giving me this error:

test.c: In function ‘main’:
test.c:10:1: warning: ‘RIPEMD160’ is deprecated [-Wdeprecated-declarations]
10 | unsigned char* pmd = RIPEMD160(rawdata, n, md);
| ^~~~~~~~
In file included from /usr/local/include/openssl/opensslv.h:109,
from /usr/local/include/openssl/macros.h:11,
from /usr/local/include/openssl/opensslconf.h:14,
from /usr/local/include/openssl/macros.h:10,
from /usr/local/include/openssl/ripemd.h:14,
from test.c:3:
/usr/local/include/openssl/ripemd.h:49:1: note: declared here
49 | DEPRECATEDIN_3_0(unsigned char *RIPEMD160(const unsigned char *d, size_t n,

Richard MacCutchan 20-Mar-20 12:36pm

The compiler is telling you that this function is out of date and should not be used. Use a newer hash, such as SHA256, which is fully supported.

Asish6542165 20-Mar-20 12:39pm

is there any way to use ripemd160 hash in the c program.

Richard MacCutchan 20-Mar-20 12:55pm

That is not an error, it is a warning, the program should still compile. However, you can suppress it by adding the option -Wno-deprecated-declarations to your compiler options as shown in the message.

Asish6542165 20-Mar-20 13:43pm

thanks a lot for you help