"object already exists" exception using RSACryptoServic eProvider

[=?Utf-8?B?R2FicmllbCBNw6luZGV6?=]

Hello everyone.

I have a small class that encapsulates some functionallity to work with the
RSACryptoServic eProvider. Here is the code of the class i'm using:

public class dsRSA
{
private RSACryptoServic eProvider objRSA = null;

public dsRSA(string keyContainerNam e)
{
CspParameters csp = new CspParameters() ;
csp.Flags = CspProviderFlag s.UseMachineKey Store;
csp.KeyContaine rName = keyContainerNam e;
objRSA = new RSACryptoServic eProvider(1024, csp);
}
// other code goes here that i'm not using at
this point
}

My app is calling the following code when a winform loads:

private dsRSA _rsa;
_rsa = new dsRSA("ABACUS") ;

as you can see i'm only instatiating de RSACryptoServic eProvider with the
keyContainerNam e as a parameter passed by my app.. so when execution of the
code reaches the line "objRSA = new RSACryptoServic eProvider(1024, csp);" i
get the following error:

CryptographicEx ception: "object already exists"

StackTrace " en
System.Security .Cryptography.C ryptographicExc eption.ThrowCry ptogaphicExcept ion(Int32
hr)\r\n en System.Security .Cryptography.U tils._CreateCSP (CspParameters
param, Boolean randomKeyContai ner, SafeProvHandle& hProv)\r\n en
System.Security .Cryptography.U tils.CreateProv Handle(CspParam eters parameters,
Boolean randomKeyContai ner)\r\n en
System.Security .Cryptography.U tils.GetKeyPair Helper(CspAlgor ithmType keyType,
CspParameters parameters, Boolean randomKeyContai ner, Int32 dwKeySize,
SafeProvHandle& safeProvHandle, SafeKeyHandle& safeKeyHandle)\ r\n en
System.Security .Cryptography.R SACryptoService Provider.GetKey Pair()\r\n en
System.Security .Cryptography.R SACryptoService Provider..ctor( Int32 dwKeySize,
CspParameters parameters, Boolean useDefaultKeySi ze)\r\n en
System.Security .Cryptography.R SACryptoService Provider..ctor( Int32 dwKeySize,
CspParameters parameters)\r\n en DescaCryp.dsRSA ..ctor(String
keyContainerNam e) en F:\\ProyectosC# \\DescaCryp\\RS A.cs:lÃ*nea 24\r\n en
KeyFileGenerato r.frmKeyGen..ct or() en C:\\Gabriel\\De sca\\ABACUS\\AB ACUS
2.1\\Codigo ABACUS\\KeyFile Generator\\frmK eyGen.cs:lÃ*nea 51" string
The app have just worked fine for some time, and is still working on other
machines, but suddenly stopped worked on my developing machine.. Does anyone
know what is causing this execption and how to solve it??

Note: If i change the keyContainerNam e parameter, it works ok... it seems to
be a restriction or something i need to release when the app closes...

Thanks

[pbx]

On Feb 5, 7:10 am, Gabriel Méndez
<GabrielMn...@d iscussions.micr osoft.comwrote:

Hello everyone.

I have a small class that encapsulates some functionallity to work with theRSACryptoSer viceProvider. Here is the code of the class i'm using:

public class dsRSA
{
privateRSACrypt oServiceProvide robjRSA = null;

public dsRSA(string keyContainerNam e)
{
CspParameters csp = new CspParameters() ;
csp.Flags = CspProviderFlag s.UseMachineKey Store;
csp.KeyContaine rName = keyContainerNam e;
objRSA = newRSACryptoSer viceProvider(10 24, csp);
}

// other code goes here that i'm not using at
this point

}

My app is calling the following code when a winform loads:

private dsRSA _rsa;
_rsa = new dsRSA("ABACUS") ;

as you can see i'm only instatiating deRSACryptoServ iceProviderwith the
keyContainerNam e as a parameter passed by my app.. so when execution of the
code reaches the line "objRSA = newRSACryptoSer viceProvider(10 24, csp);" i
get the following error:

CryptographicEx ception: "objectalreadye xists"

StackTrace " enSystem.Securi ty.Cryptography .CryptographicE xception..Throw CryptogaphicExc ept*ion(Int32
hr)\r\n en System.Security .Cryptography.U tils._CreateCSP (CspParameters
param, Boolean randomKeyContai ner, SafeProvHandle& hProv)\r\n en
System.Security .Cryptography.U tils.CreateProv Handle(CspParam eters parameters,
Boolean randomKeyContai ner)\r\n en
System.Security .Cryptography.U tils.GetKeyPair Helper(CspAlgor ithmType keyType,
CspParameters parameters, Boolean randomKeyContai ner, Int32 dwKeySize,
SafeProvHandle& safeProvHandle, SafeKeyHandle& safeKeyHandle)\ r\n en
System.Security .Cryptography.R SACryptoService Provider.GetKey Pair()\r\n en
System.Security .Cryptography.R SACryptoService Provider..ctor( Int32 dwKeySize,
CspParameters parameters, Boolean useDefaultKeySi ze)\r\n en
System.Security .Cryptography.R SACryptoService Provider..ctor( Int32 dwKeySize,
CspParameters parameters)\r\n en DescaCryp.dsRSA ..ctor(String
keyContainerNam e) en F:\\ProyectosC# \\DescaCryp\\RS A.cs:línea 24\r\n en
KeyFileGenerato r.frmKeyGen..ct or() en C:\\Gabriel\\De sca\\ABACUS\\AB ACUS
2.1\\Codigo ABACUS\\KeyFile Generator\\frmK eyGen.cs:línea 51" string

The app have just worked fine for some time, and is still working on other
machines, but suddenly stopped worked on my developing machine.. Does anyone
know what is causing this execption and how to solve it??

Note: If i change the keyContainerNam e parameter, it works ok... it seemsto
be a restriction or something i need to release when the app closes...

Thanks

Are you running on Vista? I am having the same problem.

[=?Utf-8?B?R2FicmllbCBNw6luZGV6?=]

Nop... i'm currently having that error my laptop running Windows XP SP2
--
Ing. Gabriel Méndez
MCP, MCAD
"pbx" wrote:

On Feb 5, 7:10 am, Gabriel Méndez
<GabrielMn...@d iscussions.micr osoft.comwrote:

Hello everyone.

I have a small class that encapsulates some functionallity to work with theRSACryptoSer viceProvider. Here is the code of the class i'm using:

public class dsRSA
{
privateRSACrypt oServiceProvide robjRSA = null;

public dsRSA(string keyContainerNam e)
{
CspParameters csp = new CspParameters() ;
csp.Flags = CspProviderFlag s.UseMachineKey Store;
csp.KeyContaine rName = keyContainerNam e;
objRSA = newRSACryptoSer viceProvider(10 24, csp);
}

// other code goes here that i'm not using at
this point

}

My app is calling the following code when a winform loads:

private dsRSA _rsa;
_rsa = new dsRSA("ABACUS") ;

as you can see i'm only instatiating deRSACryptoServ iceProviderwith the
keyContainerNam e as a parameter passed by my app.. so when execution of the
code reaches the line "objRSA = newRSACryptoSer viceProvider(10 24, csp);" i
get the following error:

CryptographicEx ception: "objectalreadye xists"

StackTrace " enSystem.Securi ty.Cryptography .CryptographicE xception..Throw CryptogaphicExc eptÂ*ion(Int32
hr)\r\n en System.Security .Cryptography.U tils._CreateCSP (CspParameters
param, Boolean randomKeyContai ner, SafeProvHandle& hProv)\r\n en
System.Security .Cryptography.U tils.CreateProv Handle(CspParam eters parameters,
Boolean randomKeyContai ner)\r\n en
System.Security .Cryptography.U tils.GetKeyPair Helper(CspAlgor ithmType keyType,
CspParameters parameters, Boolean randomKeyContai ner, Int32 dwKeySize,
SafeProvHandle& safeProvHandle, SafeKeyHandle& safeKeyHandle)\ r\n en
System.Security .Cryptography.R SACryptoService Provider.GetKey Pair()\r\n en
System.Security .Cryptography.R SACryptoService Provider..ctor( Int32 dwKeySize,
CspParameters parameters, Boolean useDefaultKeySi ze)\r\n en
System.Security .Cryptography.R SACryptoService Provider..ctor( Int32 dwKeySize,
CspParameters parameters)\r\n en DescaCryp.dsRSA ..ctor(String
keyContainerNam e) en F:\\ProyectosC# \\DescaCryp\\RS A.cs:lÃ*nea 24\r\n en
KeyFileGenerato r.frmKeyGen..ct or() en C:\\Gabriel\\De sca\\ABACUS\\AB ACUS
2.1\\Codigo ABACUS\\KeyFile Generator\\frmK eyGen.cs:lÃ*nea 51" string

The app have just worked fine for some time, and is still working on other
machines, but suddenly stopped worked on my developing machine.. Does anyone
know what is causing this execption and how to solve it??

Note: If i change the keyContainerNam e parameter, it works ok... it seems to
be a restriction or something i need to release when the app closes...

Thanks

Are you running on Vista? I am having the same problem.