diff options
Diffstat (limited to 'crypto/src/asn1/x9/X9IntegerConverter.cs')
-rw-r--r-- | crypto/src/asn1/x9/X9IntegerConverter.cs | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/crypto/src/asn1/x9/X9IntegerConverter.cs b/crypto/src/asn1/x9/X9IntegerConverter.cs new file mode 100644 index 000000000..2bce20488 --- /dev/null +++ b/crypto/src/asn1/x9/X9IntegerConverter.cs @@ -0,0 +1,48 @@ +using System; + +using Org.BouncyCastle.Math; +using Org.BouncyCastle.Math.EC; + +namespace Org.BouncyCastle.Asn1.X9 +{ + public sealed class X9IntegerConverter + { + private X9IntegerConverter() + { + } + + public static int GetByteLength( + ECFieldElement fe) + { + return (fe.FieldSize + 7) / 8; + } + + public static int GetByteLength( + ECCurve c) + { + return (c.FieldSize + 7) / 8; + } + + public static byte[] IntegerToBytes( + BigInteger s, + int qLength) + { + byte[] bytes = s.ToByteArrayUnsigned(); + + if (qLength < bytes.Length) + { + byte[] tmp = new byte[qLength]; + Array.Copy(bytes, bytes.Length - tmp.Length, tmp, 0, tmp.Length); + return tmp; + } + else if (qLength > bytes.Length) + { + byte[] tmp = new byte[qLength]; + Array.Copy(bytes, 0, tmp, tmp.Length - bytes.Length, bytes.Length); + return tmp; + } + + return bytes; + } + } +} |