diff options
Diffstat (limited to 'crypto/src/asn1/DerBMPString.cs')
-rw-r--r-- | crypto/src/asn1/DerBMPString.cs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/crypto/src/asn1/DerBMPString.cs b/crypto/src/asn1/DerBMPString.cs index fcada7ad4..4a8ef8c84 100644 --- a/crypto/src/asn1/DerBMPString.cs +++ b/crypto/src/asn1/DerBMPString.cs @@ -72,6 +72,23 @@ namespace Org.BouncyCastle.Asn1 return (DerBmpString)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit); } + public static DerBmpString GetOptional(Asn1Encodable element) + { + if (element == null) + throw new ArgumentNullException(nameof(element)); + + if (element is DerBmpString existing) + return existing; + + if (element is IAsn1Convertible asn1Convertible && !(element is Asn1Object) && + asn1Convertible.ToAsn1Object() is DerBmpString converted) + { + return converted; + } + + return null; + } + private readonly string m_str; internal DerBmpString(byte[] contents) |