Is there a simple C or C++ function that calculates the sha1 hash of a string?

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sha1 function in cpp (C++)Hi,

I was just looking for a function that calculates the sha1 hash of string and returns the result.

C (and to a lesser extent, C++) are not known for having lots of built-in functionality. You'll probably be able to find a library that has one or more functions for this purpose. Which language are you using? — Chris Lutz, Aug 03 '11 at 22:50

score 50 · Answer 1 · edited Dec 01 '18 at 10:36

50

Not built-in. Try openssl's crypto library.

(https://www.openssl.org/source/)

(https://github.com/openssl/openssl/blob/master/include/openssl/sha.h)

(https://www.openssl.org/docs/man1.1.0/crypto/SHA1.html)

#include <openssl/sha.h>

int main()
{  
  const unsigned char str[] = "Original String";
  unsigned char hash[SHA_DIGEST_LENGTH]; // == 20

  SHA1(str, sizeof(str) - 1, hash);

  // do some stuff with the hash

  return 0;
}

Link with -lssl, which will imply -lcrypto. If you are linking statically you might need to link both.

edited Dec 01 '18 at 10:36

Zitrax

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answered Aug 03 '11 at 23:03

Zaffy

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FYI: need to link with `-lcrypto` to compile. E.g. `gcc example.c -lcrypto`. – ntc2 Jan 23 '14 at 03:38
5

Also: the package to install on Debian based GNU/Linuxes is `libssl-dev`. – ntc2 Jan 23 '14 at 04:10
And the package to install on Fedora 36 is `openssl-devel`. – FriskySaga Nov 11 '22 at 00:48

score 10 · Answer 2 · answered Aug 03 '11 at 22:50

10

CryptoPP is a great C++ library for cryptographic functions. It has a method for calculating a SHA1 digest. See examples of the hashing functions here.

answered Aug 03 '11 at 22:50

jterrace

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score 2 · Answer 3 · edited May 23 '17 at 11:46

2

Here's an example: http://www.codeproject.com/KB/recipes/csha1.aspx#csha1is

Also, this question was already addressed on this thread. They have a link for some further help. Check it out.

edited May 23 '17 at 11:46

Community

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answered Aug 03 '11 at 22:52

Nadir Muzaffar

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score 2 · Answer 4 · answered Aug 03 '11 at 22:52

2

libgcrypt

answered Aug 03 '11 at 22:52

Karoly Horvath

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score 0 · Answer 5 · answered Aug 03 '11 at 22:52

0

Check out this post on Ubuntu Forums. They suggest looking in libcrypt.

Also there's an implementation here but I'm not sure what the license is.

answered Aug 03 '11 at 22:52

Chris Thompson

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score -4 · Answer 6 · answered Aug 03 '11 at 22:51

-4

You need to use a library. Boost has this functionality.

answered Aug 03 '11 at 22:51

Zelgada

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Instead of just linking to the Boost home page, could you link to the library that you claim exists, or at least mention that library's name? – stakx - no longer contributing Aug 02 '16 at 19:34

Is there a simple C or C++ function that calculates the sha1 hash of a string?

6 Answers6