Delphi 公钥私钥生成与使用 - 详细指南

Delphi是一种编程语言，自身不提供公钥和私钥的直接生成功能。公钥和私钥通常用于数据加密解密以及数字签名验证。在Delphi中，您可以通过第三方库（如OpenSSL或Cryptlib）来生成公钥和私钥并进行相关加密解密操作。

以下是一个使用OpenSSL库生成RSA公钥和私钥的示例：

uses
  IdSSLOpenSSLHeaders,
  IdSSLOpenSSL,
  IdCTypes,
  IdGlobal,
  IdSys,
  IdOpenSSLVersion,
  IdSSLOpenSSLHeaders_err,
  IdSSLOpenSSLHeaders_x509,
  IdSSLOpenSSLHeaders_evp,
  IdSSLOpenSSLHeaders_objects,
  IdSSLOpenSSLHeaders_ssl,
  IdSSLOpenSSLHeaders_crypto,
  IdSSLOpenSSLHeaders_rsa,
  IdSSLOpenSSLHeaders_pem,
  IdSSLOpenSSLHeaders_bio;

procedure GenerateRSAKeys(out PublicKey, PrivateKey: string);
var
  rsa: PRSA;
  bio: PBIO;
  publicKeyBio: PBIO;
  privateKeyBio: PBIO;
  publicKeyPEM: PAnsiChar;
  privateKeyPEM: PAnsiChar;
begin
  OpenSSL_add_all_algorithms();
  ERR_load_crypto_strings();

  rsa := RSA_generate_key(2048, RSA_F4, nil, nil);
  if rsa = nil then
    raise Exception.Create('Failed to generate RSA key');

  bio := BIO_new(BIO_s_mem());
  if bio = nil then
    raise Exception.Create('Failed to create BIO');

  publicKeyBio := BIO_new(BIO_s_mem());
  if publicKeyBio = nil then
    raise Exception.Create('Failed to create public key BIO');

  privateKeyBio := BIO_new(BIO_s_mem());
  if privateKeyBio = nil then
    raise Exception.Create('Failed to create private key BIO');

  if PEM_write_bio_RSAPublicKey(publicKeyBio, rsa) = 0 then
    raise Exception.Create('Failed to write public key to BIO');

  if PEM_write_bio_RSAPrivateKey(privateKeyBio, rsa, nil, nil, 0, nil, nil) = 0 then
    raise Exception.Create('Failed to write private key to BIO');

  BIO_get_mem_ptr(publicKeyBio, @publicKeyPEM);
  PublicKey := publicKeyPEM;

  BIO_get_mem_ptr(privateKeyBio, @privateKeyPEM);
  PrivateKey := privateKeyPEM;

  RSA_free(rsa);
  BIO_free_all(bio);
end;

您可以调用GenerateRSAKeys函数生成RSA公钥和私钥并将其分别存储在PublicKey和PrivateKey变量中。

需要注意的是，上述示例依赖于OpenSSL库，请确保正确配置OpenSSL库以及相关头文件。