[Mono-dev] Possible Bug in BigInteger.Multiply

Sebastien Pouliot sebastien.pouliot at gmail.com
Fri Dec 30 15:15:53 EST 2005

Hello Neale,

I'll look into this on Monday (*), on the i386 architecture but this should
also happen there...
* but maybe Ben will also want to take a look at his old code before that

Please fill a bugzilla entry for this (on Mono.Security.dll) including the
pastebin information.

On 12/30/05, Neale Ferguson <neale at sinenomine.net> wrote:
> I've been having build problems with my 64-bit s390 system. I've tracked
> it down to what I believe is a bug in BigInteger.Multiply that is
> overwriting a BigInteger field and corrupting the .data.Length field of the
> object. Multiply is being called from OddPow. The error manifests itself in
> SquarePositive when the bounds check for the array is performed:
> Unhandled Exception: System.IndexOutOfRangeException: Array index is out
> of range.
> in <0x00094> Mono.Math.BigInteger+Kernel:SquarePositive (
> Mono.Math.BigInteger bi, System.UInt32[] wkSpace)
> in <0x00900> Mono.Math.BigInteger+ModulusRing:OddPow (Mono.Math.BigIntegerb,
> Mono.Math.BigInteger exp)
> in <0x00092> Mono.Math.BigInteger+ModulusRing:Pow (Mono.Math.BigInteger b,
> Mono.Math.BigInteger exp)
> in <0x000be> Mono.Math.BigInteger:ModPow (Mono.Math.BigInteger exp,
> Mono.Math.BigInteger n)
> in <0x0026c> Mono.Security.Cryptography.RSAManaged:DecryptValue (
> System.Byte[] rgb)
> in <0x00086>
> System.Security.Cryptography.RSACryptoServiceProvider:DecryptValue (
> System.Byte[] rgb)
> in <0x0003e> Mono.Security.Cryptography.PKCS1:RSASP1 (
> System.Security.Cryptography.RSA rsa, System.Byte[] m)
> in <0x000ee> Mono.Security.Cryptography.PKCS1:Sign_v15 (
> System.Security.Cryptography.RSA rsa,
> System.Security.Cryptography.HashAlgorithm hash, System.Byte[] hashValue)
> in <0x0009c>
> System.Security.Cryptography.RSAPKCS1SignatureFormatter:CreateSignature (
> System.Byte[] rgbHash)
> in <0x00278> Mono.Security.StrongName:Sign (System.String fileName)
> in <0x002f2> Mono.Tools.SN:ReSign (System.String assemblyName,
> System.Security.Cryptography.RSA key)
> in <0x0175c> Mono.Tools.SN:Main (System.String[] args)
> The bug is described at http://pastebin.com/484359 with background
> information at http://pastebin.com/484243.
> Neale
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