Sign string with certificate

[Lukas_Casa (Lukáš Čása)]

Hello, 

in examples you have how to sign files with certificates, but is there possibility to sign string?

For example: we have string "Hello world" 

from this text we will need to make hash SHA256 and sign with  RSASSA-PKCS1 and make output in base64

i try something like this 

 rsa:= TRSAEncSign.Create;

 rsa.KeyLength:= kl2048;

 // to make output in base64

 rsa.OutputFormat:= base64;

 rsa.Unicode := yesUni;

 to make hash SHA256 before sign

 rsa.hashFunction := TRSAhashfunction.sha256;

 // to sign with RSASSA-PKCS1

 rsa.signType:=TRSASignType.spkcs1_5;

// but not know how to load certificates 

// i need to use it on ios i have them in PEM format

 rsa.FromOpenSSLCert(EditCrt.Text);

 rsa.FromOpenSSLPrivateKey(EditKey.Text);

MemoRes.Text:= rsa.Sign('HelloWorld');

is possible to do it? if yes how?

[Marion (Marion (TMS Crypto Pack developer))]

Hi,

The functionnality to sign string with certificate is not yet implemented. You need to extract the key from your private key file to use TRSAEncSign.
Moreover, the openssl functions are only available on Windows for the time being. I will take a look to extend them to other platforms.

Best regards,

Marion

[Bernard]

With v5.x, you can load private keys (RSA and EC) from a PKCS#8 file and sign either a string or a file (a digest will be computed and signed in both cases).