Delphi OpenSSL Library

Delphi wrapper for OpenSSL.

Features

• Encrypt/Decrypt using RSA algorithm
• Symmetric cipher routines
• Base64 encoding e decoding
• Basic PAM support
• Generation of pseudo-random bit strings
• Basic SMIME support
• Generate RSA KeyPairs in PKCS PEM format

Usage

Encrypt with the public key inside X509 certificate

Command line:

OpenSSL rsautl -encrypt -certin -inkey publiccert.cer -in test.txt -out test.txt.cry

Source code:

var
  RSAUtil: TRSAUtil;
  Cerificate: TX509Cerificate;
begin
  RSAUtil := TRSAUtil.Create;
  try
    Cerificate := TX509Cerificate.Create;
    try
      Cerificate.LoadFromFile('publiccert.cer');
      RSAUtil.PublicKey.LoadFromCertificate(Cerificate);
      RSAUtil.PublicEncrypt('test.txt', 'test.txt.cry');
    finally
      Cerificate.Free;
    end;
  finally
    RSAUtil.Free;
  end;
end;

Encrypt with the public key in PEM format

Command line:

OpenSSL rsautl -encrypt -pubin -inkey publickey.pem -in test.txt -out test.txt.cry

Source code:

var
  RSAUtil: TRSAUtil;
begin
  RSAUtil := TRSAUtil.Create;
  try
    RSAUtil.PublicKey.LoadFromFile('publickey.pem');
    RSAUtil.PublicEncrypt('test.txt', 'test.txt.cry');
  finally
    RSAUtil.Free;
  end;
end;

Decrypt with the private key in PEM format

Command line:

OpenSSL rsautl -decrypt -inkey privatekey.pem -in test.txt.cry -out test.txt

Source code:

var
  RSAUtil: TRSAUtil;
begin
  RSAUtil := TRSAUtil.Create;
  try
    RSAUtil.PrivateKey.OnNeedPassphrase := PassphraseReader;
    RSAUtil.PrivateKey.LoadFromFile('privatekey.pem');
    RSAUtil.PrivateDecrypt('test.txt.cry', 'test.txt');
  finally
    RSAUtil.Free;
  end;
end;

Encrypt with AES256

Command line:

OpenSSL enc -base64 -aes256 -in text.plain -out text.aes256 -k secure

Source code:

var
  EncUtil: TEncUtil;
begin
  EncUtil := TEncUtil.Create;
  try
    EncUtil.UseBase64 := True;
    EncUtil.Passphrase := 'secure';
    EncUtil.Cipher := 'AES-256';
    EncUtil.Encrypt('text.plain', 'text.aes256');
  finally
    EncUtil.Free;
  end;
end;

Todo

• Symmetric cryptography (partially done)
• compute hash functions
• Sign e verify
• RSA data management
• Data managing for X509
• Manage information according to the PKCS #12 standard

Prerequisite

OpenSSL library must be in your system path

Installation

• Add the source path "Source" to your Delphi project path
• Run the demo and follow the tutorial