internal static unsafe string DerStringToManagedString(
byte[] derString,
Asn1StringTypeFlags flags = AnyTextStringType)
{
SafeAsn1StringHandle asn1String = OpenSslD2I(
(zero, ppin, len) => d2i_ASN1_type_bytes(zero, ppin, len, flags),
derString,
checkHandle: false);
if (asn1String.IsInvalid)
{
return(null);
}
byte[] utf8Bytes;
using (asn1String)
using (SafeBioHandle bio = BIO_new(BIO_s_mem()))
{
int len = ASN1_STRING_print_ex(bio, asn1String, Asn1StringPrintFlags.ASN1_STRFLGS_UTF8_CONVERT);
if (len < 0)
{
throw CreateOpenSslCryptographicException();
}
int bioSize = GetMemoryBioSize(bio);
utf8Bytes = new byte[bioSize + 1];
int read = BIO_read(bio, utf8Bytes, utf8Bytes.Length);
if (read < 0)
{
throw CreateOpenSslCryptographicException();
}
}
int nonNullCount = utf8Bytes.Length;
if (utf8Bytes[utf8Bytes.Length - 1] == 0)
{
for (int i = utf8Bytes.Length - 1; i >= 0; i--)
{
if (utf8Bytes[i] != 0)
{
break;
}
nonNullCount = i;
}
}
return(Encoding.UTF8.GetString(utf8Bytes, 0, nonNullCount));
}
internal static string DerStringToManagedString(byte[] derString)
{
SafeAsn1StringHandle asn1String = DecodeAsn1TypeBytes(derString, derString.Length, AnyTextStringType);
if (asn1String.IsInvalid)
{
return(null);
}
using (asn1String)
{
return(Asn1StringToManagedString(
asn1String,
(bio, str, flags) => Asn1StringPrintEx(bio, str, flags)));
}
}
private static extern int Asn1StringPrintEx(SafeBioHandle bio, SafeAsn1StringHandle str, Asn1StringPrintFlags flags);
private static extern int ASN1_STRING_print_ex(SafeBioHandle bio, SafeAsn1StringHandle str, Asn1StringPrintFlags flags);
