private static string GetFingerprint(IntPtr x509)
{
var bufferHandle = default(GCHandle);
int length = OpenSsl.EVP_MAX_MD_SIZE;
var buffer = new byte[length];
try
{
bufferHandle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
if (OpenSsl.X509_digest(x509, OpenSsl.EVP_sha256(), bufferHandle.AddrOfPinnedObject(), ref length) != 1)
{
throw new Exception($"Cannot calculate digest: {OpenSsl.GetLastError()}");
}
}
finally
{
bufferHandle.Free();
}
var sb = new StringBuilder("sha-256 ");
for (var i = 0; i < length; ++i)
{
sb.AppendFormat("{0:X2}:", buffer[i]);
}
sb.Length -= 1;
return(sb.ToString());
}
