本文介绍如何在C#及Unity环境中利用BouncyCastle库实现国密算法SM2和SM4的加解密操作。文章详细展示了通过BouncyCastle在Unity中生成SM2公私钥、加密解密数据，以及使用SM4RepairVersion库进行SM4的ECB模式加密解密的过程。
最近在捣腾国密2、3、4，很显然，C#,尤其是Unity需要用到BouncyCastle这个dll。这里总结一下C# 使用国密即SM2-SM4的事情，同时跟大家描绘一下C#的SM2-SM4跟C++的OpenSSL是咋相互加密解密的。可能会分很多部分。
首先是下载一个BouncyCastle，导入Unity或者Winform之类的(本质有啥区别？没有，都是.net的东西)。
bccrypto-csharp-1.8.5 dll
c# bccrypto-csharp-1.8.5源码
下载后导入Unity/VisualStudio之类的里面。我这里用Unity作为例子，并且我下载的是源码，因为方便调试查问题。 导入好后就可以开始干活了。因为这玩意是国际Csharp版本的必要内容。 接下来我们来徜徉一下SM的内容，这个其实网上也有版本，但是你下载后会发现，除了跟自己加解密畅通之外，跟其他的那简直不行。我这里截个图：
注意，这个地方有个SM4RepairVersion，说明单单SM4我改得有点多。细节部分暂时不去说了。 因为说不完。哇咔咔。 啥都没有说，总要说点啥，那就举个例子吧。反正左手痛，也不知道昨晚上干啥了。作为一个有伴侣的人，左手痛，只能是压的。
先放张图： 反正就是这几张图实现了国密SM2获取public key和private key并且对123456进行加密和对加密结果自己解密。(注意，此处还只是淡出的Csharp版本，并没有openssl的事情)
这里直接整代码： `using System; using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using CDRW.SM.SAMPLE; using CDRW.SM; using CDRW.EXT; using CDRW.SM.Data;
namespace CDRW.SM.SAMPLE { public class EncryptDecrypt_SM23 : MonoBehaviour { private InputField mPubInputField;
private
InputField
mPriInputField
;
private
InputField
mEnDecryptInputField
;
private
InputField
mResultInputField
;
private
Button
mPubPriKeyButton
;
private
Button
mEncryptButton
;
private
Button
mDecryptButton
;
void
Start
(
)
{
mPubInputField
=
gameObject
.
GetChildUIScript
<
InputField
>
(
"PubLabel/Key"
)
;
mPriInputField
=
gameObject
.
GetChildUIScript
<
InputField
>
(
"PriLabel/Key"
)
;
mEnDecryptInputField
=
gameObject
.
GetChildUIScript
<
InputField
>
(
"EnDecryptLabel/Key"
)
;
mResultInputField
=
gameObject
.
GetChildUIScript
<
InputField
>
(
"ResultLabel/Key"
)
;
mPubPriKeyButton
=
gameObject
.
GetChildUIScript
<
Button
>
(
"PubPriButton"
)
;
mPubPriKeyButton
.
onClick
.
AddListener
(
PubPriKey
)
;
mEncryptButton
=
gameObject
.
GetChildUIScript
<
Button
>
(
"EncryptButton"
)
;
mEncryptButton
.
onClick
.
AddListener
(
DoEncrypt
)
;
mDecryptButton
=
gameObject
.
GetChildUIScript
<
Button
>
(
"DecryptButton"
)
;
mDecryptButton
.
onClick
.
AddListener
(
DoDecrypt
)
;
mEnDecryptInputField
.
text
=
string
.
Empty
;
mResultInputField
.
text
=
"show result"
;
mPubInputField
.
text
=
""
;
mPriInputField
.
text
=
""
;
mEnDecryptInputField
.
text
=
"123456"
;
}
private
void
PubPriKey
(
)
{
//获取公钥、私钥的方法
SM2Utils
.
GenerateKeyPair
(
out
string
publicKey
,
out
string
privateKey
)
;
mPubInputField
.
text
=
publicKey
;
mPriInputField
.
text
=
privateKey
;
}
private
void
DoEncrypt
(
)
{
string
content
=
mEnDecryptInputField
.
text
;
if
(
string
.
IsNullOrWhiteSpace
(
mPubInputField
.
text
)
)
{
PubPriKey
(
)
;
}
if
(
string
.
IsNullOrWhiteSpace
(
content
)
)
{
mResultInputField
.
text
=
"Error no Input Content"
;
return
;
}
try
{
string
en
=
SM2Utils
.
Encrypt
(
mPubInputField
.
text
,
content
)
;
mResultInputField
.
text
=
en
;
}
catch
(
Exception
e
)
{
mResultInputField
.
text
=
e
.
ToString
(
)
;
}
}
private
void
DoDecrypt
(
)
{
string
content
=
mEnDecryptInputField
.
text
;
if
(
string
.
IsNullOrWhiteSpace
(
mPriInputField
.
text
)
)
{
PubPriKey
(
)
;
}
if
(
string
.
IsNullOrWhiteSpace
(
content
)
)
{
mResultInputField
.
text
=
"Error no Input Content"
;
return
;
}
try
{
string
en
=
DataUtil
.
ChangeCode
(
SM2Utils
.
Decrypt
(
mPriInputField
.
text
,
content
,
false
)
)
;
mResultInputField
.
text
=
en
;
}
catch
(
Exception
e
)
{
mResultInputField
.
text
=
e
.
ToString
(
)
;
}
}
private
void
OnDestroy
(
)
{
mEncryptButton
?.
onClick
.
RemoveListener
(
DoEncrypt
)
;
mEncryptButton
?.
onClick
.
RemoveListener
(
DoDecrypt
)
;
}
}
} ` 当然，我承认错误，我没有写注释。
SM3其实已经包含在内了，而且SM3没啥好说的，就算了。
那么SM4咧，这玩意内容多。得好好整。图片已经在上面了，下面贴代码： `using System; using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using CDRW.SM; using System.Text; using Org.BouncyCastle.Utilities.Encoders; using CDRW.EXT;
namespace CDRW.SM.SAMPLE { public class EncryptDecrypt_SM4 : MonoBehaviour { private InputField mKeyInputField;
private
InputField
mDataInputField
;
private
InputField
mResultInputField
;
private
Button
mECBEncryptButton
;
private
Button
mECBDecryptButton
;
private
SM4RepairVersion
.
SM4Utils
sm4
;
void
Start
(
)
{
mKeyInputField
=
gameObject
.
GetChildUIScript
<
InputField
>
(
"KeyLabel/Key"
)
;
mDataInputField
=
gameObject
.
GetChildUIScript
<
InputField
>
(
"DataKeyLabel/Key"
)
;
mResultInputField
=
gameObject
.
GetChildUIScript
<
InputField
>
(
"ResultKeyLabel/Key"
)
;
mECBEncryptButton
=
gameObject
.
GetChildUIScript
<
Button
>
(
"EncryptButton"
)
;
mECBDecryptButton
=
gameObject
.
GetChildUIScript
<
Button
>
(
"DecryptButton"
)
;
mKeyInputField
.
text
=
"0123456789ABCDEFFEDCBA9876543210"
;
mDataInputField
.
text
=
"FEDCBA98765432100123456789ABCDEF"
;
mResultInputField
.
text
=
""
;
mECBEncryptButton
.
onClick
.
AddListener
(
OnECBEncryptClick
)
;
mECBDecryptButton
.
onClick
.
AddListener
(
OnECBDecryptClick
)
;
sm4
=
new
SM4RepairVersion
.
SM4Utils
(
)
;
sm4
.
hexString
=
true
;
}
private
void
OnECBEncryptClick
(
)
{
string
key
=
mKeyInputField
.
text
;
if
(
string
.
IsNullOrWhiteSpace
(
key
)
)
{
mResultInputField
.
text
=
"the key is null"
;
return
;
}
string
content
=
mDataInputField
.
text
;
if
(
string
.
IsNullOrWhiteSpace
(
content
)
)
{
mResultInputField
.
text
=
"the data is null"
;
return
;
}
sm4
.
secretKey
=
key
;
var
info
=
sm4
.
Encrypt_ECB
(
content
)
;
mResultInputField
.
text
=
info
;
}
private
void
OnECBDecryptClick
(
)
{
string
key
=
mKeyInputField
.
text
;
if
(
string
.
IsNullOrWhiteSpace
(
key
)
)
{
mResultInputField
.
text
=
"the key is null"
;
return
;
}
string
content
=
mDataInputField
.
text
;
if
(
string
.
IsNullOrWhiteSpace
(
content
)
)
{
mResultInputField
.
text
=
"the data is null"
;
return
;
}
sm4
.
secretKey
=
key
;
string
enECBR
=
sm4
.
Decrypt_ECB
(
content
)
;
mResultInputField
.
text
=
enECBR
;
}
private
void
OnDestroy
(
)
{
mECBEncryptButton
?.
onClick
.
RemoveListener
(
OnECBEncryptClick
)
;
mECBDecryptButton
?.
onClick
.
RemoveListener
(
OnECBDecryptClick
)
;
}
}
}
` 至于Csharp和OpenSSL交互的具体过程，待续。。。
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