1 files changed, 89 insertions, 0 deletions
diff --git a/Crypto/src/asn1/x509/X509NameEntryConverter.cs b/Crypto/src/asn1/x509/X509NameEntryConverter.cs
new file mode 100644
index 000000000..5872656a9
--- /dev/null
+++ b/Crypto/src/asn1/x509/X509NameEntryConverter.cs
@@ -0,0 +1,89 @@
+using System;
+using System.Globalization;
+using System.IO;
+using System.Text;
+
+using Org.BouncyCastle.Utilities.Encoders;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+ /**
+ * It turns out that the number of standard ways the fields in a DN should be
+ * encoded into their ASN.1 counterparts is rapidly approaching the
+ * number of machines on the internet. By default the X509Name class
+ * will produce UTF8Strings in line with the current recommendations (RFC 3280).
+ * <p>
+ * An example of an encoder look like below:
+ * <pre>
+ * public class X509DirEntryConverter
+ * : X509NameEntryConverter
+ * {
+ * public Asn1Object GetConvertedValue(
+ * DerObjectIdentifier oid,
+ * string value)
+ * {
+ * if (str.Length() != 0 && str.charAt(0) == '#')
+ * {
+ * return ConvertHexEncoded(str, 1);
+ * }
+ * if (oid.Equals(EmailAddress))
+ * {
+ * return new DerIA5String(str);
+ * }
+ * else if (CanBePrintable(str))
+ * {
+ * return new DerPrintableString(str);
+ * }
+ * else if (CanBeUTF8(str))
+ * {
+ * return new DerUtf8String(str);
+ * }
+ * else
+ * {
+ * return new DerBmpString(str);
+ * }
+ * }
+ * }
+ * </pre>
+ * </p>
+ */
+ public abstract class X509NameEntryConverter
+ {
+ /**
+ * Convert an inline encoded hex string rendition of an ASN.1
+ * object back into its corresponding ASN.1 object.
+ *
+ * @param str the hex encoded object
+ * @param off the index at which the encoding starts
+ * @return the decoded object
+ */
+ protected Asn1Object ConvertHexEncoded(
+ string hexString,
+ int offset)
+ {
+ string str = hexString.Substring(offset);
+
+ return Asn1Object.FromByteArray(Hex.Decode(str));
+ }
+
+ /**
+ * return true if the passed in string can be represented without
+ * loss as a PrintableString, false otherwise.
+ */
+ protected bool CanBePrintable(
+ string str)
+ {
+ return DerPrintableString.IsPrintableString(str);
+ }
+
+ /**
+ * Convert the passed in string value into the appropriate ASN.1
+ * encoded object.
+ *
+ * @param oid the oid associated with the value in the DN.
+ * @param value the value of the particular DN component.
+ * @return the ASN.1 equivalent for the value.
+ */
+ public abstract Asn1Object GetConvertedValue(DerObjectIdentifier oid, string value);
+ }
+}
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