这是来自libeay32.dll(openssl project)的函数:
int i2o_ECPublicKey (EC_KEY * key, unsigned char ** out)
如何在C#中描述它(如果我想得到一个字节[])?
代码:
[DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
public extern static int i2o_ECPublicKey (IntPtr encKey, StringBuilder outPar);
我不喜欢这个,因为我认为结果是unicode。
答案
[DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
public extern static int i2o_ECPublicKey(IntPtr encKey, ref IntPtr outPar);
[DllImport(DLLNAME, CallingConvention = CallingConvention.Cdecl)]
public static extern int i2o_ECPublicKey(IntPtr encKey, int outPar);
//Pass *out as null for required buffer length.
int reqLen = i2o_ECPublicKey(k, 0);
Byte[] outBuf = new Byte[reqLen];
IntPtr unmanagedOut = Marshal.AllocCoTaskMem(outBuf.Length);
int res = i2o_ECPublicKey(k, ref unmanagedOut);
if (res == reqLen)
{
unmanagedOut -= reqLen; // because i2o_ECPublicKey add size to unmanagedOut
Marshal.Copy(unmanagedOut, outBuf, 0, outBuf.Length);
}
Marshal.FreeCoTaskMem(unmanagedOut);
答案 0 :(得分:2)
我相信手动完成,你需要使用Marshal.Copy将数组从非托管内存复制到托管字节[]。 (注意,代码未经测试)。
public extern static int i2o_ECPublicKey (IntPtr encKey, ref IntPtr outPar);
...
//Pass *out as null for required buffer length.
int reqLen = i2o_ECPublicKey(key, null);
Byte[] outBuf = new Byte[reqLen];
IntPtr unmanagedOut = Marshal.AllocCoTaskMem(outBuf.Length);
int res = i2o_ECPublicKey(key, ref unmanagedOut);
if (res == 1) {
Marshal.Copy(unmanaged, outBuf, 0, outBuf.Length);
}
Marshal.FeeCoTaskMem(unmanagedOut);
答案 1 :(得分:0)
您可以使用GetBytes
StringBuilder outPar;
string result = "";
byte[] parbytes = System.Text.Encoding.Unicode.GetBytes(outPar.ToString());
foreach(byte parbyte in parbytes)
{
result+= Convert.ToChar(parbyte);
}
return result;