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Diffstat (limited to 'crypto/src/asn1/DerGeneralizedTime.cs')
| -rw-r--r-- | crypto/src/asn1/DerGeneralizedTime.cs | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/crypto/src/asn1/DerGeneralizedTime.cs b/crypto/src/asn1/DerGeneralizedTime.cs new file mode 100644 index 000000000..dae60e876 --- /dev/null +++ b/crypto/src/asn1/DerGeneralizedTime.cs @@ -0,0 +1,305 @@ +using System; +using System.Globalization; +using System.Text; + +using Org.BouncyCastle.Utilities; + +namespace Org.BouncyCastle.Asn1 +{ + /** + * Generalized time object. + */ + public class DerGeneralizedTime + : Asn1Object + { + private readonly string time; + + /** + * return a generalized time from the passed in object + * + * @exception ArgumentException if the object cannot be converted. + */ + public static DerGeneralizedTime GetInstance( + object obj) + { + if (obj == null || obj is DerGeneralizedTime) + { + return (DerGeneralizedTime)obj; + } + + throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name, "obj"); + } + + /** + * return a Generalized Time object from a tagged object. + * + * @param obj the tagged object holding the object we want + * @param explicitly true if the object is meant to be explicitly + * tagged false otherwise. + * @exception ArgumentException if the tagged object cannot + * be converted. + */ + public static DerGeneralizedTime GetInstance( + Asn1TaggedObject obj, + bool isExplicit) + { + Asn1Object o = obj.GetObject(); + + if (isExplicit || o is DerGeneralizedTime) + { + return GetInstance(o); + } + + return new DerGeneralizedTime(((Asn1OctetString)o).GetOctets()); + } + + /** + * The correct format for this is YYYYMMDDHHMMSS[.f]Z, or without the Z + * for local time, or Z+-HHMM on the end, for difference between local + * time and UTC time. The fractional second amount f must consist of at + * least one number with trailing zeroes removed. + * + * @param time the time string. + * @exception ArgumentException if string is an illegal format. + */ + public DerGeneralizedTime( + string time) + { + this.time = time; + + try + { + ToDateTime(); + } + catch (FormatException e) + { + throw new ArgumentException("invalid date string: " + e.Message); + } + } + + /** + * base constructor from a local time object + */ + public DerGeneralizedTime( + DateTime time) + { + this.time = time.ToString(@"yyyyMMddHHmmss\Z"); + } + + internal DerGeneralizedTime( + byte[] bytes) + { + // + // explicitly convert to characters + // + this.time = Strings.FromAsciiByteArray(bytes); + } + + /** + * Return the time. + * @return The time string as it appeared in the encoded object. + */ + public string TimeString + { + get { return time; } + } + + /** + * return the time - always in the form of + * YYYYMMDDhhmmssGMT(+hh:mm|-hh:mm). + * <p> + * Normally in a certificate we would expect "Z" rather than "GMT", + * however adding the "GMT" means we can just use: + * <pre> + * dateF = new SimpleDateFormat("yyyyMMddHHmmssz"); + * </pre> + * To read in the time and Get a date which is compatible with our local + * time zone.</p> + */ + public string GetTime() + { + // + // standardise the format. + // + if (time[time.Length - 1] == 'Z') + { + return time.Substring(0, time.Length - 1) + "GMT+00:00"; + } + else + { + int signPos = time.Length - 5; + char sign = time[signPos]; + if (sign == '-' || sign == '+') + { + return time.Substring(0, signPos) + + "GMT" + + time.Substring(signPos, 3) + + ":" + + time.Substring(signPos + 3); + } + else + { + signPos = time.Length - 3; + sign = time[signPos]; + if (sign == '-' || sign == '+') + { + return time.Substring(0, signPos) + + "GMT" + + time.Substring(signPos) + + ":00"; + } + } + } + + return time + CalculateGmtOffset(); + } + + private string CalculateGmtOffset() + { + char sign = '+'; + DateTime time = ToDateTime(); + +#if SILVERLIGHT + long offset = time.Ticks - time.ToUniversalTime().Ticks; + if (offset < 0) + { + sign = '-'; + offset = -offset; + } + int hours = (int)(offset / TimeSpan.TicksPerHour); + int minutes = (int)(offset / TimeSpan.TicksPerMinute) % 60; +#else + // Note: GetUtcOffset incorporates Daylight Savings offset + TimeSpan offset = TimeZone.CurrentTimeZone.GetUtcOffset(time); + if (offset.CompareTo(TimeSpan.Zero) < 0) + { + sign = '-'; + offset = offset.Duration(); + } + int hours = offset.Hours; + int minutes = offset.Minutes; +#endif + + return "GMT" + sign + Convert(hours) + ":" + Convert(minutes); + } + + private static string Convert( + int time) + { + if (time < 10) + { + return "0" + time; + } + + return time.ToString(); + } + + public DateTime ToDateTime() + { + string formatStr; + string d = time; + bool makeUniversal = false; + + if (d.EndsWith("Z")) + { + if (HasFractionalSeconds) + { + int fCount = d.Length - d.IndexOf('.') - 2; + formatStr = @"yyyyMMddHHmmss." + FString(fCount) + @"\Z"; + } + else + { + formatStr = @"yyyyMMddHHmmss\Z"; + } + } + else if (time.IndexOf('-') > 0 || time.IndexOf('+') > 0) + { + d = GetTime(); + makeUniversal = true; + + if (HasFractionalSeconds) + { + int fCount = d.IndexOf("GMT") - 1 - d.IndexOf('.'); + formatStr = @"yyyyMMddHHmmss." + FString(fCount) + @"'GMT'zzz"; + } + else + { + formatStr = @"yyyyMMddHHmmss'GMT'zzz"; + } + } + else + { + if (HasFractionalSeconds) + { + int fCount = d.Length - 1 - d.IndexOf('.'); + formatStr = @"yyyyMMddHHmmss." + FString(fCount); + } + else + { + formatStr = @"yyyyMMddHHmmss"; + } + + // TODO? +// dateF.setTimeZone(new SimpleTimeZone(0, TimeZone.getDefault().getID())); + } + + return ParseDateString(d, formatStr, makeUniversal); + } + + private string FString( + int count) + { + StringBuilder sb = new StringBuilder(); + for (int i = 0; i < count; ++i) + { + sb.Append('f'); + } + return sb.ToString(); + } + + private DateTime ParseDateString( + string dateStr, + string formatStr, + bool makeUniversal) + { + DateTime dt = DateTime.ParseExact( + dateStr, + formatStr, + DateTimeFormatInfo.InvariantInfo); + + return makeUniversal ? dt.ToUniversalTime() : dt; + } + + private bool HasFractionalSeconds + { + get { return time.IndexOf('.') == 14; } + } + + private byte[] GetOctets() + { + return Strings.ToAsciiByteArray(time); + } + + internal override void Encode( + DerOutputStream derOut) + { + derOut.WriteEncoded(Asn1Tags.GeneralizedTime, GetOctets()); + } + + protected override bool Asn1Equals( + Asn1Object asn1Object) + { + DerGeneralizedTime other = asn1Object as DerGeneralizedTime; + + if (other == null) + return false; + + return this.time.Equals(other.time); + } + + protected override int Asn1GetHashCode() + { + return time.GetHashCode(); + } + } +} |