private void btnFirmaMasiva_Click(object sender, EventArgs e)
{
FolderBrowserDialog fbd = new FolderBrowserDialog();
DialogResult dresult = fbd.ShowDialog();
if (dresult == DialogResult.OK)
{
foreach (string file in Directory.GetFiles(fbd.SelectedPath))
{
FileInfo fInfo = new FileInfo(file);
AsymmetricKeyParameter akp = ReadPrivateKey(lblFirma.Text);
Sha1Digest dig = new Sha1Digest();
byte[] msgBytes = File.ReadAllBytes(file);
dig.BlockUpdate(msgBytes, 0, msgBytes.Length);
byte[] result = new byte[dig.GetDigestSize()];
dig.DoFinal(result, 0);
Org.BouncyCastle.Crypto.Signers.RsaDigestSigner signer = new Org.BouncyCastle.Crypto.Signers.RsaDigestSigner(dig);
signer.Init(true, akp);
signer.BlockUpdate(result, 0, result.Length);
byte[] sig = signer.GenerateSignature();
string signString = Convert.ToBase64String(sig);
string signPath = string.Format("{0}{1}", fInfo.FullName, "sgn");
File.WriteAllText(signPath, signString, System.Text.Encoding.UTF8);
}
MessageBox.Show("Firma finalizada.");
}
}
private void btnFirmarDocumento_Click(object sender, EventArgs e)
{
AsymmetricKeyParameter akp = ReadPrivateKey(lblFirma.Text);
Sha1Digest dig = new Sha1Digest();
byte[] msgBytes = File.ReadAllBytes(lblDocument.Text);
dig.BlockUpdate(msgBytes, 0, msgBytes.Length);
byte[] result = new byte[dig.GetDigestSize()];
dig.DoFinal(result, 0);
Org.BouncyCastle.Crypto.Signers.RsaDigestSigner signer = new Org.BouncyCastle.Crypto.Signers.RsaDigestSigner(dig);
signer.Init(true, akp);
signer.BlockUpdate(result, 0, result.Length);
byte[] sig = signer.GenerateSignature();
textBox2.Text = Convert.ToBase64String(sig);
MessageBox.Show("Se ha firmado el documento.");
}
public override byte[] SignHash(byte[] hash, HashAlgorithmName hashAlgorithm, RSASignaturePadding padding)
{
// https://github.com/neoeinstein/bouncycastle/blob/master/crypto/src/security/SignerUtilities.cs
var dsi = new Org.BouncyCastle.Crypto.Signers.RsaDigestSigner(
new Org.BouncyCastle.Crypto.Digests.Sha256Digest()
)
;
dsi.Init(true, this.m_keyPair.Private);
dsi.BlockUpdate(hash, 0, hash.Length);
return(dsi.GenerateSignature());
System.Console.WriteLine(hashAlgorithm);
return(null);
}
private void btnVerificarDocumento_Click(object sender, EventArgs e)
{
byte[] sign = Convert.FromBase64String(textBox2.Text);
AsymmetricKeyParameter akp = ReadPublicKey(lblFirmaPublica.Text);
Sha1Digest dig = new Sha1Digest();
byte[] msgBytes = File.ReadAllBytes(lblDocument.Text);
dig.BlockUpdate(msgBytes, 0, msgBytes.Length);
byte[] result = new byte[dig.GetDigestSize()];
dig.DoFinal(result, 0);
Org.BouncyCastle.Crypto.Signers.RsaDigestSigner signer = new Org.BouncyCastle.Crypto.Signers.RsaDigestSigner(dig);
signer.Init(false, akp);
signer.BlockUpdate(result, 0, result.Length);
if (!signer.VerifySignature(sign))
{
MessageBox.Show("RSA Digest Signer failed.", "Atención", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
MessageBox.Show("RSA Digest Signer success.", "Atención", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
