1 CI_SymEncrypt(
2               long           nFunction,
3               unsigned char   *pEntity,
4               unsigned char   *pPlainData,
5               unsigned long   nPlainLength,
6               unsigned char   *pCipherData,
7               unsigned long   *pnCipherLength
8 );

#include “Custom_Interface.h”
#include “GI_Datatype.h”
#define   reciveID  “020000000008”//假设接收方ID为020000000008
#define   sendID  “020000000009”// 假设发送方ID为020000000009
void main()
{
CI_RV                 rv;
unsigned long         dataLen, encDataLen,newDataLen;
unsigned char       data[1024]; //假设明文最大长度为1024个字节
unsigned char       encData[1024+16];//对应最大密文长度为1024+16个字节
unsigned char     newData[1024];//假设解密得到的新明文长度最大为1024个字节 
dataLen = 563;//假设加密的数据长度为563个字节
//使用与实体0008共享的第3个对称加密密钥加密将要与实体0008共享的数据。
rv = CI_SymEncrypt( 3, reciveID, data, dataLen, 
NULL, &encDataLen);
       if(rv != GI_OK)
       {
            printf(“get cipher length error. Error code is [%08x]\n”,rv);
        }
}

1  [DllImport("XXX.dll", EntryPoint = "CI_SymEncrypt", CharSet = CharSet.Auto)]
2   public static extern Int32 CI_SymEncrypt(long nFunction, ref byte[] pEntity, ref byte[] pPlainData, int nPlainLength, ref byte[] pCipherData, ref  int pnCipherLength);