> On Jan 27, 2019, at 12:43 PM, prithiraj das <prithiraj.das@xxxxxxxxx> wrote: > > Using OpenSSL, I need to implement digital signing. My approach as of now is: > 1) At the sender side, generate the hash of the data using sha256. > 2) Encrypt the hash of the data using RSA Private key for the purpose of signing. Send this encrypted hash and the data from Step 1 to the receiverr side. > 3) At the receiver's end, Decrypt the signed data(encrypted hash) using the corresponding RSA Public key. > 4) Generate hash of the data and verify the decrypted content against this hash to verify the signature > > I was thinking of using RSA_private_encrypt() method to do the signing and RSA_public_decrypt() method to decrypt the signed hash using the corresponding RSA public key. Would the above be a bad approach especially when it comes to using the methods mentioned ? Please recommend the methods to be used that would be better for the purpose of digital signing and verification using sha256 and RSA keys Do not invent your own RSA-based signature scheme. Use a standard RSA signature primitive. Either RSA-PSS, or PKCS#1 v1.5 https://en.wikipedia.org/wiki/PKCS_1#Schemes Typically, you would use CMS, which handles all the details internally. https://www.openssl.org/docs/man1.1.0/apps/cms.html -- Viktor. -- openssl-users mailing list To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
