调用OpenSSL EVP功能的Delphi / Pascal示例 [英] Delphi / Pascal Example for Calling OpenSSL EVP functions
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
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 http://www.disi.unige.it/person/FerranteM/delphiopenssl/
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 http://www.disi.unige.it/person/FerranteM/delphiopenssl/ 。
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_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_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...
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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