title: how to do cryptography (digital signature)in linux
body: <p>I have done PKCS_7_ASN_ENCODING | X509_ASN_ENCODING in windows using wincrypt and I have to verify signature in linux. Can anyone tell by about good light crypto api on linux.    </p>
  
  <p>On  searching I found <a href="http://home.gna.org/cryptodev-linux/" rel="nofollow">http://home.gna.org/cryptodev-linux/</a> and on compiling it i am getting this error crypto/hash.h: No such file or directory</p>