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调用OpenSSL EVP功能的Delphi / Pascal示例

本文介绍了调用OpenSSL EVP功能的Delphi / Pascal示例的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

有没有人有一个Delphi / Pascal例子来调用以下OpenSSL函数...





我对此感兴趣：

 程序EVP_CIPHER_CTX_init（a：PEVP_CIPHER_CTX）; 
 
函数EVP_CIPHER_CTX_cleanup（a：PEVP_CIPHER_CTX）：cint; 
 
函数EVP_CIPHER_CTX_set_key_length（x：PEVP_CIPHER_CTX; keylen：cint）：cint; 
 
函数EVP_CIPHER_CTX_ctrl（ctx：PEVP_CIPHER_CTX; type_，arg：cint; ptr：Pointer）：cint; 
 // 
 function EVP_EncryptInit（ctx：PEVP_CIPHER_CTX; const chipher_：PEVP_CIPHER; const key，iv：PByte）：cint; 
 
函数EVP_EncryptUpdate（ctx：PEVP_CIPHER_CTX; out_：pcuchar; outlen：pcint; const in_：pcuchar; inlen：cint）：cint; 
 
函数EVP_EncryptFinal（ctx：PEVP_CIPHER_CTX; out_data：PByte; outlen：pcint）：cint; 
 
函数EVP_DecryptInit（ctx：PEVP_CIPHER_CTX; chiphir_type：PEVP_CIPHER; const key，iv：PByte）：cint; 
 
函数EVP_DecryptUpdate（ctx：PEVP_CIPHER_CTX; out_data：PByte; outl：pcint; const in_：PByte; inl：cint）：cint; 
 
函数EVP_DecryptFinal（ctx：PEVP_CIPHER_CTX; outm：PByte; outlen：pcint）：cint;

谢谢！



p.s。我看过



不幸的是，该库不包括这些功能。

解决方案

是从我曾经工作的一些代码中直接抽出的几个例程。他们使用你提到的大多数加密方法。正如在评论中提到的，你真的需要使用OpenSSL文档。我通过读取它们并浏览openssl.exe程序的C源来创建下面的内容。 （从openssl.org下载）



这不是完美的，并且做了几个假设，但它显示了在Delphi中使用例程的基础知识。



原来的灵感，正如我之前在SO（！）上提到的几次，都是从。



编辑：在创建这些方法时，添加了底部的导入单元，以补充Indy头文件中的内容。我最近没有看过，有些可能已经在Indy中可用了。

  function EVP_Encrypt_AES256（Value： TBytes; APassword：TBytes）：TBytes; 
 var 
 cipher：PEVP_CIPHER; 
 ctx：EVP_CIPHER_CTX; 
 salt，key，iv，buf：TBytes; 
 block_size：integer; 
 buf_start，out_len：integer; 
 begin 
 cipher：= EVP_aes_256_cbc; 
 salt：= EVP_GetSalt; 
 EVP_GetKeyIV（APassword，cipher，salt，key，iv）; 
 
 EVP_CIPHER_CTX_init（@ctx）; 
 try 
 EVP_EncryptInit（@ctx，cipher，@key [0]，@iv [0]）; 
 block_size：= EVP_CIPHER_CTX_block_size（@ctx）; 
 SetLength（buf，Length（Value）+ block_size + SALT_MAGIC_LEN + PKCS5_SALT_LEN）; 
 buf_start：= 0; 
 Move（PAnsiChar（SALT_MAGIC）^，buf [buf_start]，SALT_MAGIC_LEN）; 
 Inc（buf_start，SALT_MAGIC_LEN）; 
 Move（salt [0]，buf [buf_start]，PKCS5_SALT_LEN）; 
 Inc（buf_start，PKCS5_SALT_LEN）; 
 EVP_EncryptUpdate（@ctx，@buf [buf_start]，@out_len，@Value [0]，Length（Value））; 
 Inc（buf_start，out_len）; 
 EVP_EncryptFinal（@ctx，@buf [buf_start]，@out_len）; 
 Inc（buf_start，out_len）; 
 SetLength（buf，buf_start）; 
 result：= buf; 
 finally 
 EVP_CIPHER_CTX_cleanup（@ctx）; 
结束
结束
 
函数EVP_GetSalt：TBytes; 
 begin 
 SetLength（result，PKCS5_SALT_LEN）; 
 RAND_pseudo_bytes（@result [0]，PKCS5_SALT_LEN）; 
结束
 
程序EVP_GetKeyIV（APassword：TBytes; ACipher：PEVP_CIPHER; const ASalt：TBytes; out Key，IV：TBytes）; 
 var 
 ctx：EVP_MD_CTX; 
 hash：PEVP_MD; 
 mdbuff：TBytes; 
 mds：cardinal; 
 nkey，niv：integer; 
 begin 
 hash：= EVP_sha256; 
 mds：= 0; 
 SetLength（mdbuff，EVP_MAX_MD_SIZE）; 
 
 nkey：= ACipher.key_len; 
 niv：= ACipher.iv_len; 
 SetLength（Key，nkey）; 
 SetLength（IV，nkey）; //最大大小开始，然后减少它
 
 Assert（hash.md_size> = nkey）; 
 Assert（hash.md_size> = niv）; 
 
 //这与EVP_BytesToKey的工作方式几乎一样。但是
 //允许多次通过哈希循环，并允许
 //选择不同的哈希方法。我们不需要这个。 
 // OpenSSL文件说它已经过时了，互联网资源建议使用
 //类似PKCS5_v2_PBE_keyivgen和/或PKCS5_PBKDF2_HMAC_SHA1 
 //但是这个方法很容易到达DEC， DCP例程，并且易于
 //在其他环境中使用。最终，Key和IV依靠密码
 //和盐，可以轻松地进行改造。 
 
 //此方法依赖于哈希方法产生一个
 //的正确大小的事实。如果
 //需要使用较小的哈希值使密钥足够大，则EVP_BytesToKey会通过muptiple散列传递。 
 
 EVP_MD_CTX_init（@ctx）; 
 try 
 //第一个
 EVP_DigestInit_ex（@ctx，hash，nil）; 
 EVP_DigestUpdate（@ctx，@APassword [0]，Length（APassword））; 
 if（ASalt  EVP_DigestUpdate（@ctx，@ASalt [0]，Length（ASalt））; 
 EVP_DigestFinal_ex（@ctx，@Key [0]，mds）; 
 
 //派生IV下一个
 EVP_DigestInit_ex（@ctx，hash，nil）; 
 EVP_DigestUpdate（@ctx，@Key [0]，mds）; 
 EVP_DigestUpdate（@ctx，@APassword [0]，Length（APassword））; 
 if（ASalt  EVP_DigestUpdate（@ctx，@ASalt [0]，Length（ASalt））; 
 EVP_DigestFinal_ex（@ctx，@IV [0]，mds）; 
 
 SetLength（IV，niv）; 
 finally 
 EVP_MD_CTX_cleanup（@ctx）; 
结束
结束

解密：

 code> function EVP_Decrypt_AES256（const Value：TBytes; APassword：TBytes）：TBytes; 
 var 
 cipher：PEVP_CIPHER; 
 ctx：EVP_CIPHER_CTX; 
 salt，key，iv，buf：TBytes; 
 src_start，buf_start，out_len：integer; 
 begin 
 cipher：= EVP_aes_256_cbc; 
 SetLength（salt，SALT_SIZE）; 
 //首先读取魔术文本和盐 - 如果有任何
 if（AnsiString（TEXCoding.ASCII.GetString（Value，0，SALT_MAGIC_LEN））= SALT_MAGIC）则
 begin 
移动（值[SALT_MAGIC_LEN]，salt [0]，SALT_SIZE）; 
 EVP_GetKeyIV（APassword，cipher，salt，key，iv）; 
 src_start：= SALT_MAGIC_LEN + SALT_SIZE; 
 end 
 else 
 begin 
 EVP_GetKeyIV（APassword，cipher，nil，key，iv）; 
 src_start：= 0; 
结束
 
 EVP_CIPHER_CTX_init（@ctx）; 
 try 
 EVP_DecryptInit（@ctx，cipher，@key [0]，@iv [0]）; 
 SetLength（buf，Length（Value））; 
 buf_start：= 0; 
 EVP_DecryptUpdate（@ctx，@buf [buf_start]，@out_len，@Value [src_start]，Length（Value） -  src_start）; 
 Inc（buf_start，out_len）; 
 EVP_DecryptFinal（@ctx，@buf [buf_start]，@out_len）; 
 Inc（buf_start，out_len）; 
 SetLength（buf，buf_start）; 
 result：= buf; 
 finally 
 EVP_CIPHER_CTX_cleanup（@ctx）; 
结束
结束

我的额外导入单位：

 单位libeay32; 
 
 {
 OpenSSL libeay32.dll库的导入单位。 
最初是基于Marco Ferrante的工作。 
 http://www.csita.unige.it/ 
 http://www.disi.unige.it/ 
然后在Indy图书馆
，当然，来自http://www.openssl.org的C源代码
 
只有我们需要使用的部分已被翻译/导入。 
图书馆中不包括这些功能的全部功能
 
 2010-03-11为什么重新发明车轮？ Indy已经完成了这个
的大块，所以使用它 -  IdSSLOpenSSLHeaders 
现在我们通常只是包含在Indy代码中不可用的东西。 
主要是加密的东西而不是SSL的东西。 
} 
 
接口
 
使用
 SysUtils，Windows，
 IdSSLOpenSSLHeaders; 
 
 const 
 LIBEAY_DLL_NAME ='libeay32.dll'; 
 PROC_ADD_ALL_ALGORITHMS_NOCONF ='OPENSSL_add_all_algorithms_noconf'; 
 PROC_ADD_ALL_ALGORITHMS ='OpenSSL_add_all_algorithms'; 
 
 EVP_PKEY_RSA = IdSSLOpenSSLHeaders.EVP_PKEY_RSA; 
 PKCS5_SALT_LEN = IdSSLOpenSSLHeaders.PKCS5_SALT_LEN; 
 EVP_MAX_KEY_LENGTH = IdSSLOpenSSLHeaders.EVP_MAX_KEY_LENGTH; 
 EVP_MAX_IV_LENGTH = IdSSLOpenSSLHeaders.EVP_MAX_IV_LENGTH; 
 EVP_MAX_MD_SIZE = IdSSLOpenSSLHeaders.EVP_MAX_MD_SIZE; 
 
 type 
 PEVP_PKEY = IdSSLOpenSSLHeaders.PEVP_PKEY; 
 PRSA = IdSSLOpenSSLHeaders.PRSA; 
 EVP_MD_CTX = IDSSLOpenSSLHeaders.EVP_MD_CTX; 
 EVP_CIPHER_CTX = IdSSLOpenSSLHeaders.EVP_CIPHER_CTX; 
 PEVP_CIPHER = IdSSLOpenSSLHeaders.PEVP_CIPHER; 
 PEVP_MD = IdSSLOpenSSLHeaders.PEVP_MD; 
 
 type 
 TSSLProgressCallbackFunction = procedure（status：integer; value：integer; cb_arg：pointer）; 
 TSSLPasswordCallbackFunction = function（buffer：TBytes; size：integer; rwflag：integer; u：pointer）：integer; cdecl; 
 TOpenSSL_InitFunction = procedure; cdecl; 
 
 type 
 PEK_ARRAY = ^ EK_ARRAY; 
 EK_ARRAY = PByteArray的数组; 
 PUBK_ARRAY = PEVP_PKEY的数组; 
 PPUBK_ARRAY = ^ PUBK_ARRAY; 
 
函数EVP_aes_256_cbc：PEVP_CIPHER; cdecl; 
函数EVP_md5：PEVP_MD; cdecl; 
函数EVP_sha1：PEVP_MD; cdecl; 
函数EVP_sha256：PEVP_MD; cdecl; 
函数EVP_PKEY_assign（pkey：PEVP_PKEY; key_type：integer; key：Pointer）：integer; cdecl; 
函数EVP_PKEY_new：PEVP_PKEY; cdecl; 
 procedure EVP_PKEY_free（key：PEVP_PKEY）; cdecl; 
 function EVP_PKEY_assign_RSA（pkey：PEVP_PKEY; key：PRSA）：integer; 
函数EVP_PKEY_size（pkey：PEVP_PKEY）：integer; cdecl; 
 
程序EVP_CIPHER_CTX_init（a：PEVP_CIPHER_CTX）; cdecl; 
函数EVP_CIPHER_CTX_cleanup（a：PEVP_CIPHER_CTX）：integer; cdecl; 
函数EVP_CIPHER_CTX_block_size（ctx：PEVP_CIPHER_CTX）：integer; cdecl; 
程序EVP_MD_CTX_init（ctx：PEVP_MD_CTX）; cdecl; 
函数EVP_MD_CTX_cleanup（ctx：PEVP_MD_CTX）：integer; cdecl; 
函数EVP_BytesToKey（cipher_type：PEVP_CIPHER; md：PEVP_MD; salt：PByte; data：PByte; datal：integer; count：integer; key：PByte; iv：PByte）：integer; cdecl; 
函数EVP_EncryptInit_ex（ctx：PEVP_CIPHER_CTX; cipher_type：PEVP_CIPHER; impl：PENGINE; key：PByte; iv：PByte）：integer; cdecl; 
函数EVP_EncryptInit（ctx：PEVP_CIPHER_CTX; cipher_type：PEVP_CIPHER; key：PByte; iv：PByte）：integer; cdecl; 
函数EVP_EncryptUpdate（ctx：PEVP_CIPHER_CTX; data_out：PByte; var outl：integer; data_in：PByte; inl：integer）：integer; cdecl; 
函数EVP_EncryptFinal（ctx：PEVP_CIPHER_CTX; data_out：PByte; var outl：integer）：integer; cdecl; 
函数EVP_DecryptInit_ex（ctx：PEVP_CIPHER_CTX; cipher_type：PEVP_CIPHER; impl：PENGINE; key：PByte; iv：PByte）：integer; cdecl; 
函数EVP_DecryptInit（ctx：PEVP_CIPHER_CTX; cipher_type：PEVP_CIPHER; key：PByte; iv：PByte）：integer; cdecl; 
函数EVP_DecryptUpdate（ctx：PEVP_CIPHER_CTX; data_out：PByte; var outl：integer; data_in：PByte; inl：integer）：integer; cdecl; 
函数EVP_DecryptFinal（ctx：PEVP_CIPHER_CTX; data_out：PByte; var outl：integer）：integer; cdecl; 
函数EVP_SealInit（ctx：PEVP_CIPHER_CTX; cipher_type：PEVP_CIPHER; ek：PEK_ARRAY; ekl：PIntegerArray; iv：PByte; pubk：PPUBK_ARRAY; npubk：integer）：integer; cdecl; 
函数EVP_SealUpdate（ctx：PEVP_CIPHER_CTX; data_out：PByte; var outl：integer; data_in：PByte; inl：integer）：integer; 
函数EVP_SealFinal（ctx：PEVP_CIPHER_CTX; data_out：PByte; var outl：integer）：integer; cdecl; 
函数EVP_OpenInit（ctx：PEVP_CIPHER_CTX; cipher_type：PEVP_CIPHER; ek：PByte; ekl：integer; iv：PByte; priv：PEVP_PKEY）：integer; cdecl; 
函数EVP_OpenUpdate（ctx：PEVP_CIPHER_CTX; data_out：PByte; var outl：integer; data_in：PByte; inl：integer）：integer; 
 function EVP_OpenFinal（ctx：PEVP_CIPHER_CTX; data_out：PByte; var outl：integer）：integer; cdecl; 
 procedure EVP_DigestInit（ctx：PEVP_MD_CTX; md：PEVP_MD）; cdecl; 
函数EVP_DigestInit_ex（ctx：PEVP_MD_CTX; md：PEVP_MD; impl：PENGINE）：integer; cdecl; 
函数EVP_DigestUpdate（ctx：PEVP_MD_CTX; data：PByte; cnt：integer）：integer; cdecl; 
函数EVP_DigestFinal（ctx：PEVP_MD_CTX; md：PByte; var s：cardinal）：integer; cdecl; 
 function EVP_DigestFinal_ex（ctx：PEVP_MD_CTX; md：PByte; var s：cardinal）：integer; cdecl; 
程序EVP_SignInit（ctx：PEVP_MD_CTX; md：PEVP_MD）; 
函数EVP_SignInit_ex（ctx：PEVP_MD_CTX; md：PEVP_MD; impl：PENGINE）：integer; 
函数EVP_SignUpdate（ctx：PEVP_MD_CTX; data：PByte; cnt：integer）：integer; 
 function EVP_SignFinal（ctx：PEVP_MD_CTX; sig：PByte; var s：integer; pkey：PEVP_PKEY）：integer; cdecl; 
 procedure EVP_VerifyInit（ctx：PEVP_MD_CTX; md：PEVP_MD）; 
函数EVP_VerifyInit_ex（ctx：PEVP_MD_CTX; md：PEVP_MD; impl：PENGINE）：integer; 
函数EVP_VerifyUpdate（ctx：PEVP_MD_CTX; data：PByte; cnt：integer）：integer; 
 function EVP_VerifyFinal（ctx：PEVP_MD_CTX; sig：PByte; s：integer; pkey：PEVP_PKEY）：integer; cdecl; 
 
函数X509_get_pubkey（cert：PX509）：PEVP_PKEY; cdecl; 
 
 procedure BIO_free_all（a：PBIO）; cdecl; 
 
函数PEM_write_bio_RSA_PUBKEY（bp：PBIO; x：PRSA）：integer; cdecl; 
函数PEM_read_bio_PUBKEY（bp：PBIO; x：PPEVP_PKEY; cb：TSSLPasswordCallbackFunction; u：pointer）：PEVP_PKEY; cdecl; 
函数PEM_write_bio_PUBKEY（bp：PBIO; x：PEVP_PKEY）：integer; cdecl; 
 
函数RAND_load_file（const filename：PAnsiChar; max_bytes：longint）：integer; cdecl; 
函数RAND_bytes（buf：PByte; num：integer）：integer; cdecl; 
函数RAND_pseudo_bytes（buf：PByte; num：integer）：integer; cdecl; 
 
函数RSA_generate_key（num：integer; e：Cardinal; cb：TSSLProgressCallbackFunction; cb_arg：pointer）：PRSA; cdecl; 
 procedure RSA_free（r：PRSA）; cdecl; 
 
执行
 
 resourcestring 
 sLibeay32NotLoaded ='libeay32.dll未加载'; 
 sAddAllAlgorithmsProcNotFound ='OpenSSL_add_all_algorithms过程未在libeay32.dll中定义; 
 
 
函数EVP_aes_256_cbc：PEVP_CIPHER; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_md5; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_sha1; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_sha256; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_PKEY_assign; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_PKEY_new; cdecl外部LIBEAY_DLL_NAME; 
程序EVP_PKEY_free; cdecl外部LIBEAY_DLL_NAME; 
 function EVP_PKEY_assign_RSA（pkey：PEVP_PKEY; key：PRSA）：integer; 
 begin 
 //在evp.h 
中实现为一个宏结果：= EVP_PKEY_assign（pkey，EVP_PKEY_RSA，PAnsiChar（key））; 
结束
函数EVP_PKEY_size; cdecl外部LIBEAY_DLL_NAME; 
 
程序EVP_CIPHER_CTX_init; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_CIPHER_CTX_cleanup; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_CIPHER_CTX_block_size; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_BytesToKey; cdecl外部LIBEAY_DLL_NAME; 
 function EVP_EncryptInit_ex; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_EncryptInit; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_EncryptUpdate; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_EncryptFinal; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_DecryptInit_ex; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_DecryptInit; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_DecryptUpdate; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_DecryptFinal; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_SealInit; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_SealUpdate（ctx：PEVP_CIPHER_CTX; data_out：PByte; var outl：integer; data_in：PByte; inl：integer）：integer; 
 begin 
 // EVP_SealUpdate被定义为EVP_EncryptUpdate，在evp.h 
 result：= EVP_EncryptUpdate（ctx，data_out，outl，data_in，inl）; 
结束
函数EVP_SealFinal; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_OpenInit; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_OpenUpdate（ctx：PEVP_CIPHER_CTX; data_out：PByte; var outl：integer; data_in：PByte; inl：integer）：integer; 
 begin 
 // EVP_OpenUpdate被定义为EVP_DecryptUpdate在evp.h 
 result：= EVP_DecryptUpdate（ctx，data_out，outl，data_in，inl）; 
结束
函数EVP_OpenFinal; cdecl外部LIBEAY_DLL_NAME; 
程序EVP_MD_CTX_init; cdecl外部LIBEAY_DLL_NAME; 
函数EVP_MD_CTX_cleanup; cdecl外部LIBEAY_DLL_NAME; 
程序EVP_DigestInit;外部LIBEAY_DLL_NAME; 
函数EVP_DigestInit_ex;外部LIBEAY_DLL_NAME; 
函数EVP_DigestUpdate;外部LIBEAY_DLL_NAME; 
函数EVP_DigestFinal;外部LIBEAY_DLL_NAME; 
 function EVP_DigestFinal_ex;外部LIBEAY_DLL_NAME; 
程序EVP_SignInit（ctx：PEVP_MD_CTX; md：PEVP_MD）; 
 begin 
 //定义为evp.h中的宏
 EVP_DigestInit（ctx，md）; 
结束
函数EVP_SignInit_ex（ctx：PEVP_MD_CTX; md：PEVP_MD; impl：PENGINE）：integer; 
 begin 
 //定义为evp.h中的宏
 result：= EVP_DigestInit_ex（ctx，md，impl）; 
结束
函数EVP_SignUpdate（ctx：PEVP_MD_CTX; data：PByte; cnt：integer）：integer; 
 begin 
 //定义为evp.h中的宏
 result：= EVP_DigestUpdate（ctx，data，cnt）; 
结束
函数EVP_SignFinal; cdecl外部LIBEAY_DLL_NAME; 
 procedure EVP_VerifyInit（ctx：PEVP_MD_CTX; md：PEVP_MD）; 
 begin 
 //定义为evp.h中的宏
 EVP_DigestInit（ctx，md）; 
结束
函数EVP_VerifyInit_ex（ctx：PEVP_MD_CTX; md：PEVP_MD; impl：PENGINE）：integer; 
 begin 
 //定义为evp.h中的宏
 result：= EVP_DigestInit_ex（ctx，md，impl）; 
结束
函数EVP_VerifyUpdate（ctx：PEVP_MD_CTX; data：PByte; cnt：integer）：integer; 
 begin 
 //定义为evp.h中的宏
 result：= EVP_DigestUpdate（ctx，data，cnt）; 
结束
函数EVP_VerifyFinal; cdecl外部LIBEAY_DLL_NAME; 
 
函数X509_get_pubkey; cdecl;外部LIBEAY_DLL_NAME; 
 
 procedure BIO_free_all; cdecl外部LIBEAY_DLL_NAME; 
 
函数PEM_write_bio_RSA_PUBKEY; cdecl外部LIBEAY_DLL_NAME; 
函数PEM_read_bio_PUBKEY; cdecl外部LIBEAY_DLL_NAME; 
函数PEM_write_bio_PUBKEY; cdecl外部LIBEAY_DLL_NAME; 
 
函数RAND_load_file; cdecl外部LIBEAY_DLL_NAME; 
函数RAND_bytes; cdecl外部LIBEAY_DLL_NAME; 
函数RAND_pseudo_bytes; cdecl外部的LIBEAY_DLL_NAME; 
 
函数RSA_generate_key; cdecl外部LIBEAY_DLL_NAME; 
程序RSA_free; cdecl外部LIBEAY_DLL_NAME; 
 
结束。


Does anyone have a Delphi / Pascal example for calling the below OpenSSL functions...

http://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/packages/openssl/src/openssl.pas?revision=17634&view=markup

I am specifically interested in:

procedure EVP_CIPHER_CTX_init(a: PEVP_CIPHER_CTX);

function EVP_CIPHER_CTX_cleanup(a: PEVP_CIPHER_CTX): cint;

function EVP_CIPHER_CTX_set_key_length(x: PEVP_CIPHER_CTX; keylen: cint): cint;

function EVP_CIPHER_CTX_ctrl(ctx: PEVP_CIPHER_CTX; type_, arg: cint; ptr: Pointer): cint;
//
function EVP_EncryptInit(ctx: PEVP_CIPHER_CTX; const chipher_: PEVP_CIPHER;const key, iv: PByte): cint;

function EVP_EncryptUpdate(ctx: PEVP_CIPHER_CTX; out_: pcuchar;outlen: pcint; const in_: pcuchar; inlen: cint): cint;

function EVP_EncryptFinal(ctx: PEVP_CIPHER_CTX; out_data: PByte; outlen: pcint): cint;

function EVP_DecryptInit(ctx: PEVP_CIPHER_CTX; chiphir_type: PEVP_CIPHER;const key, iv: PByte): cint;

function EVP_DecryptUpdate(ctx: PEVP_CIPHER_CTX; out_data: PByte;outl: pcint; const in_: PByte; inl: cint): cint;

function EVP_DecryptFinal(ctx: PEVP_CIPHER_CTX; outm: PByte; outlen: pcint): cint;

Thank you!

p.s. I have seen http://www.disi.unige.it/person/FerranteM/delphiopenssl/

Unfortunately that library does not include those functions.

解决方案

Here are a couple of routines taken straight out of some code I once worked on. They use most of the encryption methods you mention. As mentioned in the comments you really need to get intimate with the OpenSSL docs. I created the stuff below by reading them and going through the C source for the openssl.exe program. (Downloaded from openssl.org).

It's not perfect and makes a couple of assumptions but it does show the basics of using the routines in Delphi.

The original inspiration, as I have mentioned several times before on SO(!), was taken from the stuff at http://www.disi.unige.it/person/FerranteM/delphiopenssl/ that you've already linked to above.

EDIT: Added an import unit at the bottom to supplement what was in the Indy headers when I created these methods. I haven't looked recently so some of this may already be available in Indy.

function EVP_Encrypt_AES256(Value: TBytes; APassword: TBytes): TBytes;
var
  cipher: PEVP_CIPHER;
  ctx: EVP_CIPHER_CTX;
  salt, key, iv, buf: TBytes;
  block_size: integer;
  buf_start, out_len: integer;
begin
  cipher := EVP_aes_256_cbc;
  salt := EVP_GetSalt;
  EVP_GetKeyIV(APassword, cipher, salt, key, iv);

  EVP_CIPHER_CTX_init(@ctx);
  try
    EVP_EncryptInit(@ctx, cipher, @key[0], @iv[0]);
    block_size := EVP_CIPHER_CTX_block_size(@ctx);
    SetLength(buf, Length(Value) + block_size + SALT_MAGIC_LEN + PKCS5_SALT_LEN);
    buf_start := 0;
    Move(PAnsiChar(SALT_MAGIC)^, buf[buf_start], SALT_MAGIC_LEN);
    Inc(buf_start, SALT_MAGIC_LEN);
    Move(salt[0], buf[buf_start], PKCS5_SALT_LEN);
    Inc(buf_start, PKCS5_SALT_LEN);
    EVP_EncryptUpdate(@ctx, @buf[buf_start], @out_len, @Value[0], Length(Value));
    Inc(buf_start, out_len);
    EVP_EncryptFinal(@ctx, @buf[buf_start], @out_len);
    Inc(buf_start, out_len);
    SetLength(buf, buf_start);
    result := buf;
  finally
    EVP_CIPHER_CTX_cleanup(@ctx);
  end;
end;

function EVP_GetSalt: TBytes;
begin
  SetLength(result, PKCS5_SALT_LEN);
  RAND_pseudo_bytes(@result[0], PKCS5_SALT_LEN);
end;

procedure EVP_GetKeyIV(APassword: TBytes; ACipher: PEVP_CIPHER; const ASalt: TBytes; out Key, IV: TBytes);
var
  ctx: EVP_MD_CTX;
  hash: PEVP_MD;
  mdbuff: TBytes;
  mds: cardinal;
  nkey, niv: integer;
begin
  hash := EVP_sha256;
  mds := 0;
  SetLength(mdbuff, EVP_MAX_MD_SIZE);

  nkey := ACipher.key_len;
  niv := ACipher.iv_len;
  SetLength(Key, nkey);
  SetLength(IV, nkey);  // Max size to start then reduce it at the end

  Assert(hash.md_size >= nkey);
  Assert(hash.md_size >= niv);

  // This is pretty much the same way that EVP_BytesToKey works. But that
  // allows multiple passes through the hashing loop and also allows to
  // choose different hashing methods. We have no need for this. The
  // OpenSSL docs say it is out of date and internet sources suggest using
  // something like PKCS5_v2_PBE_keyivgen and/or PKCS5_PBKDF2_HMAC_SHA1
  // but this method is easy to port to the DEC and DCP routines and easy to
  // use in other environments. Ultimately the Key and IV rely on the password
  // and the salt and can be easily reformed.

  // This method relies on the fact that the hashing method produces a key of
  // the correct size. EVP_BytesToKey goes through muptiple hashing passes if
  // necessary to make the key big enough when using smaller hashes.

  EVP_MD_CTX_init(@ctx);
  try
    // Key first
    EVP_DigestInit_ex(@ctx, hash, nil);
    EVP_DigestUpdate(@ctx, @APassword[0], Length(APassword));
    if (ASalt <> nil) then
      EVP_DigestUpdate(@ctx, @ASalt[0], Length(ASalt));
    EVP_DigestFinal_ex(@ctx, @Key[0], mds);

    // Derive IV next
    EVP_DigestInit_ex(@ctx, hash, nil);
    EVP_DigestUpdate(@ctx, @Key[0], mds);
    EVP_DigestUpdate(@ctx, @APassword[0], Length(APassword));
    if (ASalt <> nil) then
      EVP_DigestUpdate(@ctx, @ASalt[0], Length(ASalt));
    EVP_DigestFinal_ex(@ctx, @IV[0], mds);

    SetLength(IV, niv);
  finally
    EVP_MD_CTX_cleanup(@ctx);
  end;
end;

Decryption:

function EVP_Decrypt_AES256(const Value: TBytes; APassword: TBytes): TBytes;
var
  cipher: PEVP_CIPHER;
  ctx: EVP_CIPHER_CTX;
  salt, key, iv, buf: TBytes;
  src_start, buf_start, out_len: integer;
begin
  cipher := EVP_aes_256_cbc;
  SetLength(salt, SALT_SIZE);
  // First read the magic text and the salt - if any
  if (AnsiString(TEncoding.ASCII.GetString(Value, 0, SALT_MAGIC_LEN)) = SALT_MAGIC) then
  begin
    Move(Value[SALT_MAGIC_LEN], salt[0], SALT_SIZE);
    EVP_GetKeyIV(APassword, cipher, salt, key, iv);
    src_start := SALT_MAGIC_LEN + SALT_SIZE;
  end
  else
  begin
    EVP_GetKeyIV(APassword, cipher, nil, key, iv);
    src_start := 0;
  end;

  EVP_CIPHER_CTX_init(@ctx);
  try
    EVP_DecryptInit(@ctx, cipher, @key[0], @iv[0]);
    SetLength(buf, Length(Value));
    buf_start := 0;
    EVP_DecryptUpdate(@ctx, @buf[buf_start], @out_len, @Value[src_start], Length(Value) - src_start);
    Inc(buf_start, out_len);
    EVP_DecryptFinal(@ctx, @buf[buf_start], @out_len);
    Inc(buf_start, out_len);
    SetLength(buf, buf_start);
    result := buf;
  finally
    EVP_CIPHER_CTX_cleanup(@ctx);
  end;
end;

My extra import unit:

unit libeay32;

{
  Import unit for the OpenSSL libeay32.dll library.
  Originally based on the work by Marco Ferrante.
    http://www.csita.unige.it/
    http://www.disi.unige.it/
  then on the Indy libraries
  and, of course, the C source code from http://www.openssl.org

  Only the parts that we need to use have been translated/imported. There are
  a whole load of functions in the library that aren't included here

  2010-03-11 Why re-invent the wheel. Indy has done a large chunk of this
  already so use it - IdSSLOpenSSLHeaders
  Now we generally just include stuff that isn't available in the Indy code.
  Primarily encryption stuff rather than SSL stuff.
}

interface

uses
  SysUtils, Windows,
  IdSSLOpenSSLHeaders;

const
  LIBEAY_DLL_NAME = 'libeay32.dll';
  PROC_ADD_ALL_ALGORITHMS_NOCONF = 'OPENSSL_add_all_algorithms_noconf';
  PROC_ADD_ALL_ALGORITHMS = 'OpenSSL_add_all_algorithms';

  EVP_PKEY_RSA = IdSSLOpenSSLHeaders.EVP_PKEY_RSA;
  PKCS5_SALT_LEN = IdSSLOpenSSLHeaders.PKCS5_SALT_LEN;
  EVP_MAX_KEY_LENGTH = IdSSLOpenSSLHeaders.EVP_MAX_KEY_LENGTH;
  EVP_MAX_IV_LENGTH = IdSSLOpenSSLHeaders.EVP_MAX_IV_LENGTH;
  EVP_MAX_MD_SIZE = IdSSLOpenSSLHeaders.EVP_MAX_MD_SIZE;

type
  PEVP_PKEY = IdSSLOpenSSLHeaders.PEVP_PKEY;
  PRSA = IdSSLOpenSSLHeaders.PRSA;
  EVP_MD_CTX = IdSSLOpenSSLHeaders.EVP_MD_CTX;
  EVP_CIPHER_CTX = IdSSLOpenSSLHeaders.EVP_CIPHER_CTX;
  PEVP_CIPHER = IdSSLOpenSSLHeaders.PEVP_CIPHER;
  PEVP_MD = IdSSLOpenSSLHeaders.PEVP_MD;

type
  TSSLProgressCallbackFunction = procedure (status: integer; value: integer; cb_arg: pointer);
  TSSLPasswordCallbackFunction = function (buffer: TBytes; size: integer; rwflag: integer; u: pointer): integer; cdecl;
  TOpenSSL_InitFunction = procedure; cdecl;

type
  PEK_ARRAY = ^EK_ARRAY;
  EK_ARRAY = array of PByteArray;
  PUBK_ARRAY = array of PEVP_PKEY;
  PPUBK_ARRAY = ^PUBK_ARRAY;

function EVP_aes_256_cbc: PEVP_CIPHER; cdecl;
function EVP_md5: PEVP_MD; cdecl;
function EVP_sha1: PEVP_MD; cdecl;
function EVP_sha256: PEVP_MD; cdecl;
function EVP_PKEY_assign(pkey: PEVP_PKEY; key_type: integer; key: Pointer): integer; cdecl;
function EVP_PKEY_new: PEVP_PKEY; cdecl;
procedure EVP_PKEY_free(key: PEVP_PKEY); cdecl;
function EVP_PKEY_assign_RSA(pkey: PEVP_PKEY; key: PRSA): integer;
function EVP_PKEY_size(pkey: PEVP_PKEY): integer; cdecl;

procedure EVP_CIPHER_CTX_init(a: PEVP_CIPHER_CTX); cdecl;
function EVP_CIPHER_CTX_cleanup(a: PEVP_CIPHER_CTX): integer; cdecl;
function EVP_CIPHER_CTX_block_size(ctx: PEVP_CIPHER_CTX): integer; cdecl;
procedure EVP_MD_CTX_init(ctx: PEVP_MD_CTX); cdecl;
function EVP_MD_CTX_cleanup(ctx: PEVP_MD_CTX): integer; cdecl;
function EVP_BytesToKey(cipher_type: PEVP_CIPHER; md: PEVP_MD; salt: PByte; data: PByte; datal: integer; count: integer; key: PByte; iv: PByte): integer; cdecl;
function EVP_EncryptInit_ex(ctx: PEVP_CIPHER_CTX; cipher_type: PEVP_CIPHER; impl: PENGINE; key: PByte; iv: PByte): integer; cdecl;
function EVP_EncryptInit(ctx: PEVP_CIPHER_CTX; cipher_type: PEVP_CIPHER; key: PByte; iv: PByte): integer; cdecl;
function EVP_EncryptUpdate(ctx: PEVP_CIPHER_CTX; data_out: PByte; var outl: integer; data_in: PByte; inl: integer): integer; cdecl;
function EVP_EncryptFinal(ctx: PEVP_CIPHER_CTX; data_out: PByte; var outl: integer): integer; cdecl;
function EVP_DecryptInit_ex(ctx: PEVP_CIPHER_CTX; cipher_type: PEVP_CIPHER; impl: PENGINE; key: PByte; iv: PByte): integer; cdecl;
function EVP_DecryptInit(ctx: PEVP_CIPHER_CTX; cipher_type: PEVP_CIPHER; key: PByte; iv: PByte): integer; cdecl;
function EVP_DecryptUpdate(ctx: PEVP_CIPHER_CTX; data_out: PByte; var outl: integer; data_in: PByte; inl: integer): integer; cdecl;
function EVP_DecryptFinal(ctx: PEVP_CIPHER_CTX; data_out: PByte; var outl: integer): integer; cdecl;
function EVP_SealInit(ctx: PEVP_CIPHER_CTX; cipher_type: PEVP_CIPHER; ek: PEK_ARRAY; ekl: PIntegerArray; iv: PByte; pubk: PPUBK_ARRAY; npubk: integer): integer; cdecl;
function EVP_SealUpdate(ctx: PEVP_CIPHER_CTX; data_out: PByte; var outl: integer; data_in: PByte; inl: integer): integer;
function EVP_SealFinal(ctx: PEVP_CIPHER_CTX; data_out: PByte; var outl: integer): integer; cdecl;
function EVP_OpenInit(ctx: PEVP_CIPHER_CTX; cipher_type: PEVP_CIPHER; ek: PByte; ekl: integer; iv: PByte; priv: PEVP_PKEY): integer; cdecl;
function EVP_OpenUpdate(ctx: PEVP_CIPHER_CTX; data_out: PByte; var outl: integer; data_in: PByte; inl: integer): integer;
function EVP_OpenFinal(ctx: PEVP_CIPHER_CTX; data_out: PByte; var outl: integer): integer; cdecl;
procedure EVP_DigestInit(ctx: PEVP_MD_CTX; md: PEVP_MD); cdecl;
function EVP_DigestInit_ex(ctx: PEVP_MD_CTX; md: PEVP_MD; impl: PENGINE): integer; cdecl;
function EVP_DigestUpdate(ctx: PEVP_MD_CTX; data: PByte; cnt: integer): integer; cdecl;
function EVP_DigestFinal(ctx: PEVP_MD_CTX; md: PByte; var s: cardinal): integer; cdecl;
function EVP_DigestFinal_ex(ctx: PEVP_MD_CTX; md: PByte; var s: cardinal): integer; cdecl;
procedure EVP_SignInit(ctx: PEVP_MD_CTX; md: PEVP_MD);
function EVP_SignInit_ex(ctx: PEVP_MD_CTX; md: PEVP_MD; impl: PENGINE): integer;
function EVP_SignUpdate(ctx: PEVP_MD_CTX; data: PByte; cnt: integer): integer;
function EVP_SignFinal(ctx: PEVP_MD_CTX; sig: PByte; var s: integer; pkey: PEVP_PKEY): integer; cdecl;
procedure EVP_VerifyInit(ctx: PEVP_MD_CTX; md: PEVP_MD);
function EVP_VerifyInit_ex(ctx: PEVP_MD_CTX; md: PEVP_MD; impl: PENGINE): integer;
function EVP_VerifyUpdate(ctx: PEVP_MD_CTX; data: PByte; cnt: integer): integer;
function EVP_VerifyFinal(ctx: PEVP_MD_CTX; sig: PByte; s: integer; pkey: PEVP_PKEY): integer; cdecl;

function X509_get_pubkey(cert: PX509): PEVP_PKEY; cdecl;

procedure BIO_free_all(a: PBIO); cdecl;

function PEM_write_bio_RSA_PUBKEY(bp: PBIO; x: PRSA): integer; cdecl;
function PEM_read_bio_PUBKEY(bp: PBIO; x: PPEVP_PKEY; cb: TSSLPasswordCallbackFunction; u: pointer): PEVP_PKEY; cdecl;
function PEM_write_bio_PUBKEY(bp: PBIO; x: PEVP_PKEY): integer; cdecl;

function RAND_load_file(const filename: PAnsiChar; max_bytes: longint): integer; cdecl;
function RAND_bytes(buf: PByte; num: integer): integer; cdecl;
function RAND_pseudo_bytes(buf: PByte; num: integer): integer; cdecl;

function RSA_generate_key(num: integer; e: Cardinal; cb: TSSLProgressCallbackFunction; cb_arg: pointer): PRSA; cdecl;
procedure RSA_free(r: PRSA); cdecl;

implementation

resourcestring
  sLibeay32NotLoaded = 'libeay32.dll not loaded';
  sAddAllAlgorithmsProcNotFound = 'OpenSSL_add_all_algorithms procedure not defined in libeay32.dll';


function EVP_aes_256_cbc: PEVP_CIPHER; cdecl external LIBEAY_DLL_NAME;
function EVP_md5; cdecl external LIBEAY_DLL_NAME;
function EVP_sha1; cdecl external LIBEAY_DLL_NAME;
function EVP_sha256; cdecl external LIBEAY_DLL_NAME;
function EVP_PKEY_assign; cdecl external LIBEAY_DLL_NAME;
function EVP_PKEY_new; cdecl external LIBEAY_DLL_NAME;
procedure EVP_PKEY_free; cdecl external LIBEAY_DLL_NAME;
function EVP_PKEY_assign_RSA(pkey: PEVP_PKEY; key: PRSA): integer;
begin
  // Implemented as a macro in evp.h
  result := EVP_PKEY_assign(pkey, EVP_PKEY_RSA, PAnsiChar(key));
end;
function EVP_PKEY_size; cdecl external LIBEAY_DLL_NAME;

procedure EVP_CIPHER_CTX_init; cdecl external LIBEAY_DLL_NAME;
function EVP_CIPHER_CTX_cleanup; cdecl external LIBEAY_DLL_NAME;
function EVP_CIPHER_CTX_block_size; cdecl external LIBEAY_DLL_NAME;
function EVP_BytesToKey; cdecl external LIBEAY_DLL_NAME;
function EVP_EncryptInit_ex; cdecl external LIBEAY_DLL_NAME;
function EVP_EncryptInit; cdecl external LIBEAY_DLL_NAME;
function EVP_EncryptUpdate; cdecl external LIBEAY_DLL_NAME;
function EVP_EncryptFinal; cdecl external LIBEAY_DLL_NAME;
function EVP_DecryptInit_ex; cdecl external LIBEAY_DLL_NAME;
function EVP_DecryptInit; cdecl external LIBEAY_DLL_NAME;
function EVP_DecryptUpdate; cdecl external LIBEAY_DLL_NAME;
function EVP_DecryptFinal; cdecl external LIBEAY_DLL_NAME;
function EVP_SealInit; cdecl external LIBEAY_DLL_NAME;
function EVP_SealUpdate(ctx: PEVP_CIPHER_CTX; data_out: PByte; var outl: integer; data_in: PByte; inl: integer): integer;
begin
  // EVP_SealUpdate is #defined to EVP_EncryptUpdate in evp.h
  result := EVP_EncryptUpdate(ctx, data_out, outl, data_in, inl);
end;
function EVP_SealFinal; cdecl external LIBEAY_DLL_NAME;
function EVP_OpenInit; cdecl external LIBEAY_DLL_NAME;
function EVP_OpenUpdate(ctx: PEVP_CIPHER_CTX; data_out: PByte; var outl: integer; data_in: PByte; inl: integer): integer;
begin
  // EVP_OpenUpdate is #defined to EVP_DecryptUpdate in evp.h
  result := EVP_DecryptUpdate(ctx, data_out, outl, data_in, inl);
end;
function EVP_OpenFinal; cdecl external LIBEAY_DLL_NAME;
procedure EVP_MD_CTX_init; cdecl external LIBEAY_DLL_NAME;
function EVP_MD_CTX_cleanup; cdecl external LIBEAY_DLL_NAME;
procedure EVP_DigestInit; external LIBEAY_DLL_NAME;
function EVP_DigestInit_ex; external LIBEAY_DLL_NAME;
function EVP_DigestUpdate; external LIBEAY_DLL_NAME;
function EVP_DigestFinal; external LIBEAY_DLL_NAME;
function EVP_DigestFinal_ex; external LIBEAY_DLL_NAME;
procedure EVP_SignInit(ctx: PEVP_MD_CTX; md: PEVP_MD);
begin
  // Defined as a macro in evp.h
  EVP_DigestInit(ctx, md);
end;
function EVP_SignInit_ex(ctx: PEVP_MD_CTX; md: PEVP_MD; impl: PENGINE): integer;
begin
  // Defined as a macro in evp.h
  result := EVP_DigestInit_ex(ctx, md, impl);
end;
function EVP_SignUpdate(ctx: PEVP_MD_CTX; data: PByte; cnt: integer): integer;
begin
  // Defined as a macro in evp.h
  result := EVP_DigestUpdate(ctx, data, cnt);
end;
function EVP_SignFinal; cdecl external LIBEAY_DLL_NAME;
procedure EVP_VerifyInit(ctx: PEVP_MD_CTX; md: PEVP_MD);
begin
  // Defined as a macro in evp.h
  EVP_DigestInit(ctx, md);
end;
function EVP_VerifyInit_ex(ctx: PEVP_MD_CTX; md: PEVP_MD; impl: PENGINE): integer;
begin
  // Defined as a macro in evp.h
  result := EVP_DigestInit_ex(ctx, md, impl);
end;
function EVP_VerifyUpdate(ctx: PEVP_MD_CTX; data: PByte; cnt: integer): integer;
begin
  // Defined as a macro in evp.h
  result := EVP_DigestUpdate(ctx, data, cnt);
end;
function EVP_VerifyFinal; cdecl external LIBEAY_DLL_NAME;

function X509_get_pubkey; cdecl; external LIBEAY_DLL_NAME;

procedure BIO_free_all; cdecl external LIBEAY_DLL_NAME;

function PEM_write_bio_RSA_PUBKEY; cdecl external LIBEAY_DLL_NAME;
function PEM_read_bio_PUBKEY; cdecl external LIBEAY_DLL_NAME;
function PEM_write_bio_PUBKEY; cdecl external LIBEAY_DLL_NAME;

function RAND_load_file; cdecl external LIBEAY_DLL_NAME;
function RAND_bytes; cdecl external LIBEAY_DLL_NAME;
function RAND_pseudo_bytes; cdecl external LIBEAY_DLL_NAME;

function RSA_generate_key; cdecl external LIBEAY_DLL_NAME;
procedure RSA_free; cdecl external LIBEAY_DLL_NAME;

end.

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07-27 18:43
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