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(C#) Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat
The in.dat file can contain text or binary data of any type. The OpenSSL command does the following:
  1. Creates a SHA256 digest of the contents of the input file
  2. Signs the SHA256 digest using the private key.

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bool success;

Chilkat.PrivateKey pkey = new Chilkat.PrivateKey();

//  Load the private key from an PEM file:
success = pkey.LoadPemFile("private.pem");
if (success != true) {
    Console.WriteLine(pkey.LastErrorText);
    return;
}

//  Load the file to be signed.
Chilkat.FileAccess fac = new Chilkat.FileAccess();
byte[] inData = fac.ReadEntireFile("in.dat");

Chilkat.Rsa rsa = new Chilkat.Rsa();

//  Any string argument automatically begins the 30-day trial.
success = rsa.UnlockComponent("Anything for 30-day trial");
if (success != true) {
    Console.WriteLine(rsa.LastErrorText);
    return;
}

//  Import the private key into the RSA component:
success = rsa.ImportPrivateKeyObj(pkey);
if (success != true) {
    Console.WriteLine(rsa.LastErrorText);
    return;
}

//  OpenSSL uses big-endian.
rsa.LittleEndian = false;

byte[] sigBytes = rsa.SignBytes(inData,"sha256");
if (rsa.LastMethodSuccess != true) {
    Console.WriteLine(rsa.LastErrorText);
    return;
}

//  Save the binary signature to a file.
success = fac.WriteEntireFile("signature.sig",sigBytes);
if (success != true) {
    Console.WriteLine(fac.LastErrorText);
    return;
}

Console.WriteLine("Success.");

 

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