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

Question

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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.

Solution 1

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.

Solution 2

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.

Solution 3

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.

Solution 4

libgcrypt

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Comments

[ntc2]

FYI: need to link with -lcrypto to compile. E.g. gcc example.c -lcrypto.

[ntc2]

Also: the package to install on Debian based GNU/Linuxes is libssl-dev.

[stakx - no longer contributing]

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?