How to use the RSACryptoServiceProviderin the CompactFramework

T

TimLeung

I'm trying to use RSA encryption in the compact framework (v2.0) and hope
that someone can help me.

I've been working off the MSDN example which can be found here:

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx

In order to load key information, a method called FromXmlString is used.

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsa.fromxmlstring.aspx

The problem I have is that FromXmlString isn't supported in the compact
framework so I need some help in working out how to load the keys without the
use of this method.

I have pregenerated some keys and have saved them out using the ToXmlString
method. The XML can be found below.

Here's the code that I'm trying to use to encrypt the data. When I call the
ImportParameters method, I get a "Bad Data" exception. Can someone work out
what's wrong with this code or point me to to a working example?

Thanks in advance,
Tim



string p, q, dp, dq, inverse, d, exponent, modulus, clearText;

exponent = @"AQAB";
modulus =
@"1fHlrCs61j0VAIVMsfTcJnF51tisdL+PXBqMt971M3CZOUZJhEyTdlgJoIv8FJif41wg646fS8O+
PoWz7lX3ioyN2AhkTtvEpude5zJGBXEAjOMErhag1ILQTNu+8vqF2hxgBd5pPk/fJOAa9+gM8Pf7
CebNPBSX4zLzzvPhsHU=";
p =
@"++HaZBLVTwRCsMDzvrhdXou73wzgsfa/OSVBsasJgcHIr2y9EvwgowdVXR7oc1/tLc5KpW8TMIi8
RpFvuvzmrQ==";
q =
@"2XFF/B9pGdpSqmw+eSU1IHUaqQo6Sa9J2/F7dIs+/GMhC/TRZ5SHYLrfRrhEIGvIyG4CSeRTdChs
tnHve3NR6Q==";
dp =
@"FzDaPLCHNzk7Mq7xQjQTVKsk5wp2fawsOwS1IbiPrYS8B3rJhb/0+U2pjGNWH5lLaxY9RTIO4D8W
pqCpWtwCGQ==";
dq =
@"poREYAt95Tp4S+KRBR0lTjHftMwMTxlZqoGHVXy9Q3J2gD1/j58C/WSeT/4Uze8816DHR+b+sdmz
RxSBnTx24Q==";
inverse =
@"2VY9lcVhg1CJ+b1UjM5tOZ0dZqP6pIBVfhEXWLwnfOJyFc7CHqkUIBwtb4VqvCbhi8ZPG56yUXpw
7MYMX17R3w==";
d =
@"J3OMy5vJJLpsxgTOqL4jXn9sXT7lRj4QvIY0zq8xfgPUbWhVpCzOwHLpi45ktJOUYEOb2nQZUcpN
qY/UJy35EF/hVv6QBNJ7NF8qx1mpqxCO+9x2lLrT5nFcV3C9O9rlsU3hfriNtuFgMLicM8Fcqfnf
Z08nS0FwRYQuyxwe8WE=";

clearText = "this is the guid that i want to encrypt";

try
{
string cipherText = DoEncrypt(clearText, exponent, modulus,
p, q, dp, dq, inverse, d);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message );
}


//Here's the DoEncrypt function

public static string DoEncrypt(string cipherText, string Exponent,
string Modulus, string p, string q, string dp, string dq, string inverse,
string d)
{

string strRetval = "";
try
{

byte[] enecryptedData;

UnicodeEncoding ByteConverter = new UnicodeEncoding();

RSACryptoServiceProvider rsaDoDecrypt = new
RSACryptoServiceProvider();
RSAParameters rsaParamsPublic = new RSAParameters();

rsaParamsPublic.Exponent = ByteConverter.GetBytes(Exponent);
rsaParamsPublic.Modulus = ByteConverter.GetBytes(Modulus);
rsaParamsPublic.P = ByteConverter.GetBytes(p);
rsaParamsPublic.Q = ByteConverter.GetBytes(q);
rsaParamsPublic.DP = ByteConverter.GetBytes(dp);
rsaParamsPublic.DQ = ByteConverter.GetBytes(dq);
rsaParamsPublic.InverseQ = ByteConverter.GetBytes(inverse);
rsaParamsPublic.D = ByteConverter.GetBytes(d);

//the exception happens on the line below
rsaDoDecrypt.ImportParameters(rsaParamsPublic);

using (rsaDoDecrypt)
{
byte[] dataToEncrypt = ByteConverter.GetBytes(cipherText);
enecryptedData = rsaDoDecrypt.Encrypt(dataToEncrypt,
false);
strRetval = ByteConverter.GetString(enecryptedData, 0,
enecryptedData.Length);
}
}
catch (ArgumentNullException)
{
Console.WriteLine("Encryption failed.");
}

return strRetval;
}





<?xml version="1.0"?>
<RSAParameters xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<Exponent>AQAB</Exponent>

<Modulus>1fHlrCs61j0VAIVMsfTcJnF51tisdL+PXBqMt971M3CZOUZJhEyTdlgJoIv8FJif41wg646fS8O+
PoWz7lX3ioyN2AhkTtvEpude5zJGBXEAjOMErhag1ILQTNu+8vqF2hxgBd5pPk/fJOAa9+gM8Pf7
CebNPBSX4zLzzvPhsHU=</Modulus>

<P>++HaZBLVTwRCsMDzvrhdXou73wzgsfa/OSVBsasJgcHIr2y9EvwgowdVXR7oc1/tLc5KpW8TMIi8
RpFvuvzmrQ==</P>

<Q>2XFF/B9pGdpSqmw+eSU1IHUaqQo6Sa9J2/F7dIs+/GMhC/TRZ5SHYLrfRrhEIGvIyG4CSeRTdChs
tnHve3NR6Q==</Q>

<DP>FzDaPLCHNzk7Mq7xQjQTVKsk5wp2fawsOwS1IbiPrYS8B3rJhb/0+U2pjGNWH5lLaxY9RTIO4D8W
pqCpWtwCGQ==</DP>

<DQ>poREYAt95Tp4S+KRBR0lTjHftMwMTxlZqoGHVXy9Q3J2gD1/j58C/WSeT/4Uze8816DHR+b+sdmz
RxSBnTx24Q==</DQ>

<InverseQ>2VY9lcVhg1CJ+b1UjM5tOZ0dZqP6pIBVfhEXWLwnfOJyFc7CHqkUIBwtb4VqvCbhi8ZPG56yUXpw
7MYMX17R3w==</InverseQ>

<D>J3OMy5vJJLpsxgTOqL4jXn9sXT7lRj4QvIY0zq8xfgPUbWhVpCzOwHLpi45ktJOUYEOb2nQZUcpN
qY/UJy35EF/hVv6QBNJ7NF8qx1mpqxCO+9x2lLrT5nFcV3C9O9rlsU3hfriNtuFgMLicM8Fcqfnf
Z08nS0FwRYQuyxwe8WE=</D>
</RSAParameters>
 
T

TimLeung

I think that I can answer my own question using the ImportCspBlob method.

This method is supported in the compact framework and I think that I ought
to be able to achieve what I want to do by using this approach instead.

http://msdn.microsoft.com/en-us/lib...y.rsacryptoserviceprovider.importcspblob.aspx



TimLeung said:
I'm trying to use RSA encryption in the compact framework (v2.0) and hope
that someone can help me.

I've been working off the MSDN example which can be found here:

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx

In order to load key information, a method called FromXmlString is used.

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsa.fromxmlstring.aspx

The problem I have is that FromXmlString isn't supported in the compact
framework so I need some help in working out how to load the keys without the
use of this method.

I have pregenerated some keys and have saved them out using the ToXmlString
method. The XML can be found below.

Here's the code that I'm trying to use to encrypt the data. When I call the
ImportParameters method, I get a "Bad Data" exception. Can someone work out
what's wrong with this code or point me to to a working example?

Thanks in advance,
Tim



string p, q, dp, dq, inverse, d, exponent, modulus, clearText;

exponent = @"AQAB";
modulus =
@"1fHlrCs61j0VAIVMsfTcJnF51tisdL+PXBqMt971M3CZOUZJhEyTdlgJoIv8FJif41wg646fS8O+
PoWz7lX3ioyN2AhkTtvEpude5zJGBXEAjOMErhag1ILQTNu+8vqF2hxgBd5pPk/fJOAa9+gM8Pf7
CebNPBSX4zLzzvPhsHU=";
p =
@"++HaZBLVTwRCsMDzvrhdXou73wzgsfa/OSVBsasJgcHIr2y9EvwgowdVXR7oc1/tLc5KpW8TMIi8
RpFvuvzmrQ==";
q =
@"2XFF/B9pGdpSqmw+eSU1IHUaqQo6Sa9J2/F7dIs+/GMhC/TRZ5SHYLrfRrhEIGvIyG4CSeRTdChs
tnHve3NR6Q==";
dp =
@"FzDaPLCHNzk7Mq7xQjQTVKsk5wp2fawsOwS1IbiPrYS8B3rJhb/0+U2pjGNWH5lLaxY9RTIO4D8W
pqCpWtwCGQ==";
dq =
@"poREYAt95Tp4S+KRBR0lTjHftMwMTxlZqoGHVXy9Q3J2gD1/j58C/WSeT/4Uze8816DHR+b+sdmz
RxSBnTx24Q==";
inverse =
@"2VY9lcVhg1CJ+b1UjM5tOZ0dZqP6pIBVfhEXWLwnfOJyFc7CHqkUIBwtb4VqvCbhi8ZPG56yUXpw
7MYMX17R3w==";
d =
@"J3OMy5vJJLpsxgTOqL4jXn9sXT7lRj4QvIY0zq8xfgPUbWhVpCzOwHLpi45ktJOUYEOb2nQZUcpN
qY/UJy35EF/hVv6QBNJ7NF8qx1mpqxCO+9x2lLrT5nFcV3C9O9rlsU3hfriNtuFgMLicM8Fcqfnf
Z08nS0FwRYQuyxwe8WE=";

clearText = "this is the guid that i want to encrypt";

try
{
string cipherText = DoEncrypt(clearText, exponent, modulus,
p, q, dp, dq, inverse, d);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message );
}


//Here's the DoEncrypt function

public static string DoEncrypt(string cipherText, string Exponent,
string Modulus, string p, string q, string dp, string dq, string inverse,
string d)
{

string strRetval = "";
try
{

byte[] enecryptedData;

UnicodeEncoding ByteConverter = new UnicodeEncoding();

RSACryptoServiceProvider rsaDoDecrypt = new
RSACryptoServiceProvider();
RSAParameters rsaParamsPublic = new RSAParameters();

rsaParamsPublic.Exponent = ByteConverter.GetBytes(Exponent);
rsaParamsPublic.Modulus = ByteConverter.GetBytes(Modulus);
rsaParamsPublic.P = ByteConverter.GetBytes(p);
rsaParamsPublic.Q = ByteConverter.GetBytes(q);
rsaParamsPublic.DP = ByteConverter.GetBytes(dp);
rsaParamsPublic.DQ = ByteConverter.GetBytes(dq);
rsaParamsPublic.InverseQ = ByteConverter.GetBytes(inverse);
rsaParamsPublic.D = ByteConverter.GetBytes(d);

//the exception happens on the line below
rsaDoDecrypt.ImportParameters(rsaParamsPublic);

using (rsaDoDecrypt)
{
byte[] dataToEncrypt = ByteConverter.GetBytes(cipherText);
enecryptedData = rsaDoDecrypt.Encrypt(dataToEncrypt,
false);
strRetval = ByteConverter.GetString(enecryptedData, 0,
enecryptedData.Length);
}
}
catch (ArgumentNullException)
{
Console.WriteLine("Encryption failed.");
}

return strRetval;
}





<?xml version="1.0"?>
<RSAParameters xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<Exponent>AQAB</Exponent>

<Modulus>1fHlrCs61j0VAIVMsfTcJnF51tisdL+PXBqMt971M3CZOUZJhEyTdlgJoIv8FJif41wg646fS8O+
PoWz7lX3ioyN2AhkTtvEpude5zJGBXEAjOMErhag1ILQTNu+8vqF2hxgBd5pPk/fJOAa9+gM8Pf7
CebNPBSX4zLzzvPhsHU=</Modulus>

<P>++HaZBLVTwRCsMDzvrhdXou73wzgsfa/OSVBsasJgcHIr2y9EvwgowdVXR7oc1/tLc5KpW8TMIi8
RpFvuvzmrQ==</P>

<Q>2XFF/B9pGdpSqmw+eSU1IHUaqQo6Sa9J2/F7dIs+/GMhC/TRZ5SHYLrfRrhEIGvIyG4CSeRTdChs
tnHve3NR6Q==</Q>

<DP>FzDaPLCHNzk7Mq7xQjQTVKsk5wp2fawsOwS1IbiPrYS8B3rJhb/0+U2pjGNWH5lLaxY9RTIO4D8W
pqCpWtwCGQ==</DP>

<DQ>poREYAt95Tp4S+KRBR0lTjHftMwMTxlZqoGHVXy9Q3J2gD1/j58C/WSeT/4Uze8816DHR+b+sdmz
RxSBnTx24Q==</DQ>

<InverseQ>2VY9lcVhg1CJ+b1UjM5tOZ0dZqP6pIBVfhEXWLwnfOJyFc7CHqkUIBwtb4VqvCbhi8ZPG56yUXpw
7MYMX17R3w==</InverseQ>

<D>J3OMy5vJJLpsxgTOqL4jXn9sXT7lRj4QvIY0zq8xfgPUbWhVpCzOwHLpi45ktJOUYEOb2nQZUcpN
qY/UJy35EF/hVv6QBNJ7NF8qx1mpqxCO+9x2lLrT5nFcV3C9O9rlsU3hfriNtuFgMLicM8Fcqfnf
Z08nS0FwRYQuyxwe8WE=</D>
</RSAParameters>
Click to expand...
 
S

Simon Hart [MVP]

What is it you are trying to do? I haven't read your code in depth to
understand what you're doing. Why are you serializing a key?
--
Simon Hart
Visual Developer - Device Application Development MVP
http://www.simonrhart.com


TimLeung said:
I think that I can answer my own question using the ImportCspBlob method.

This method is supported in the compact framework and I think that I ought
to be able to achieve what I want to do by using this approach instead.

http://msdn.microsoft.com/en-us/lib...y.rsacryptoserviceprovider.importcspblob.aspx



TimLeung said:
I'm trying to use RSA encryption in the compact framework (v2.0) and hope
that someone can help me.

I've been working off the MSDN example which can be found here:

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx

In order to load key information, a method called FromXmlString is used.

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsa.fromxmlstring.aspx

The problem I have is that FromXmlString isn't supported in the compact
framework so I need some help in working out how to load the keys without the
use of this method.

I have pregenerated some keys and have saved them out using the ToXmlString
method. The XML can be found below.

Here's the code that I'm trying to use to encrypt the data. When I call the
ImportParameters method, I get a "Bad Data" exception. Can someone work out
what's wrong with this code or point me to to a working example?

Thanks in advance,
Tim



string p, q, dp, dq, inverse, d, exponent, modulus, clearText;

exponent = @"AQAB";
modulus =
@"1fHlrCs61j0VAIVMsfTcJnF51tisdL+PXBqMt971M3CZOUZJhEyTdlgJoIv8FJif41wg646fS8O+
PoWz7lX3ioyN2AhkTtvEpude5zJGBXEAjOMErhag1ILQTNu+8vqF2hxgBd5pPk/fJOAa9+gM8Pf7
CebNPBSX4zLzzvPhsHU=";
p =
@"++HaZBLVTwRCsMDzvrhdXou73wzgsfa/OSVBsasJgcHIr2y9EvwgowdVXR7oc1/tLc5KpW8TMIi8
RpFvuvzmrQ==";
q =
@"2XFF/B9pGdpSqmw+eSU1IHUaqQo6Sa9J2/F7dIs+/GMhC/TRZ5SHYLrfRrhEIGvIyG4CSeRTdChs
tnHve3NR6Q==";
dp =
@"FzDaPLCHNzk7Mq7xQjQTVKsk5wp2fawsOwS1IbiPrYS8B3rJhb/0+U2pjGNWH5lLaxY9RTIO4D8W
pqCpWtwCGQ==";
dq =
@"poREYAt95Tp4S+KRBR0lTjHftMwMTxlZqoGHVXy9Q3J2gD1/j58C/WSeT/4Uze8816DHR+b+sdmz
RxSBnTx24Q==";
inverse =
@"2VY9lcVhg1CJ+b1UjM5tOZ0dZqP6pIBVfhEXWLwnfOJyFc7CHqkUIBwtb4VqvCbhi8ZPG56yUXpw
7MYMX17R3w==";
d =
@"J3OMy5vJJLpsxgTOqL4jXn9sXT7lRj4QvIY0zq8xfgPUbWhVpCzOwHLpi45ktJOUYEOb2nQZUcpN
qY/UJy35EF/hVv6QBNJ7NF8qx1mpqxCO+9x2lLrT5nFcV3C9O9rlsU3hfriNtuFgMLicM8Fcqfnf
Z08nS0FwRYQuyxwe8WE=";

clearText = "this is the guid that i want to encrypt";

try
{
string cipherText = DoEncrypt(clearText, exponent, modulus,
p, q, dp, dq, inverse, d);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message );
}


//Here's the DoEncrypt function

public static string DoEncrypt(string cipherText, string Exponent,
string Modulus, string p, string q, string dp, string dq, string inverse,
string d)
{

string strRetval = "";
try
{

byte[] enecryptedData;

UnicodeEncoding ByteConverter = new UnicodeEncoding();

RSACryptoServiceProvider rsaDoDecrypt = new
RSACryptoServiceProvider();
RSAParameters rsaParamsPublic = new RSAParameters();

rsaParamsPublic.Exponent = ByteConverter.GetBytes(Exponent);
rsaParamsPublic.Modulus = ByteConverter.GetBytes(Modulus);
rsaParamsPublic.P = ByteConverter.GetBytes(p);
rsaParamsPublic.Q = ByteConverter.GetBytes(q);
rsaParamsPublic.DP = ByteConverter.GetBytes(dp);
rsaParamsPublic.DQ = ByteConverter.GetBytes(dq);
rsaParamsPublic.InverseQ = ByteConverter.GetBytes(inverse);
rsaParamsPublic.D = ByteConverter.GetBytes(d);

//the exception happens on the line below
rsaDoDecrypt.ImportParameters(rsaParamsPublic);

using (rsaDoDecrypt)
{
byte[] dataToEncrypt = ByteConverter.GetBytes(cipherText);
enecryptedData = rsaDoDecrypt.Encrypt(dataToEncrypt,
false);
strRetval = ByteConverter.GetString(enecryptedData, 0,
enecryptedData.Length);
}
}
catch (ArgumentNullException)
{
Console.WriteLine("Encryption failed.");
}

return strRetval;
}





<?xml version="1.0"?>
<RSAParameters xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<Exponent>AQAB</Exponent>

<Modulus>1fHlrCs61j0VAIVMsfTcJnF51tisdL+PXBqMt971M3CZOUZJhEyTdlgJoIv8FJif41wg646fS8O+
PoWz7lX3ioyN2AhkTtvEpude5zJGBXEAjOMErhag1ILQTNu+8vqF2hxgBd5pPk/fJOAa9+gM8Pf7
CebNPBSX4zLzzvPhsHU=</Modulus>

<P>++HaZBLVTwRCsMDzvrhdXou73wzgsfa/OSVBsasJgcHIr2y9EvwgowdVXR7oc1/tLc5KpW8TMIi8
RpFvuvzmrQ==</P>

<Q>2XFF/B9pGdpSqmw+eSU1IHUaqQo6Sa9J2/F7dIs+/GMhC/TRZ5SHYLrfRrhEIGvIyG4CSeRTdChs
tnHve3NR6Q==</Q>

<DP>FzDaPLCHNzk7Mq7xQjQTVKsk5wp2fawsOwS1IbiPrYS8B3rJhb/0+U2pjGNWH5lLaxY9RTIO4D8W
pqCpWtwCGQ==</DP>

<DQ>poREYAt95Tp4S+KRBR0lTjHftMwMTxlZqoGHVXy9Q3J2gD1/j58C/WSeT/4Uze8816DHR+b+sdmz
RxSBnTx24Q==</DQ>

<InverseQ>2VY9lcVhg1CJ+b1UjM5tOZ0dZqP6pIBVfhEXWLwnfOJyFc7CHqkUIBwtb4VqvCbhi8ZPG56yUXpw
7MYMX17R3w==</InverseQ>

<D>J3OMy5vJJLpsxgTOqL4jXn9sXT7lRj4QvIY0zq8xfgPUbWhVpCzOwHLpi45ktJOUYEOb2nQZUcpN
qY/UJy35EF/hVv6QBNJ7NF8qx1mpqxCO+9x2lLrT5nFcV3C9O9rlsU3hfriNtuFgMLicM8Fcqfnf
Z08nS0FwRYQuyxwe8WE=</D>
</RSAParameters>
Click to expand...
Click to expand...
 
V

vivekanand H

In the above code you have hard coded the below values

exponent = @"AQAB";
modulus =

In .net compact framework how to get the exponent and modulus values from public key.

I try using CryptDecodeObject() but giving me exception.

Please help me how to do this.

I am using .net compact framework 3.5.

I am trying to use RSA encryption in the compact framework (v2.0) and hope
that someone can help me.

I have been working off the MSDN example which can be found here:

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx

In order to load key information, a method called FromXmlString is used.

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsa.fromxmlstring.aspx

The problem I have is that FromXmlString is not supported in the compact
framework so I need some help in working out how to load the keys without the
use of this method.

I have pregenerated some keys and have saved them out using the ToXmlString
method. The XML can be found below.

Here is the code that I am trying to use to encrypt the data. When I call the
ImportParameters method, I get a "Bad Data" exception. Can someone work out
what is wrong with this code or point me to to a working example?

Thanks in advance,
Tim



string p, q, dp, dq, inverse, d, exponent, modulus, clearText;

exponent = @"AQAB";
modulus =
@"1fHlrCs61j0VAIVMsfTcJnF51tisdL+PXBqMt971M3CZOUZJhEyTdlgJoIv8FJif41wg646fS8O+
PoWz7lX3ioyN2AhkTtvEpude5zJGBXEAjOMErhag1ILQTNu+8vqF2hxgBd5pPk/fJOAa9+gM8Pf7
CebNPBSX4zLzzvPhsHU=";
p =
@"++HaZBLVTwRCsMDzvrhdXou73wzgsfa/OSVBsasJgcHIr2y9EvwgowdVXR7oc1/tLc5KpW8TMIi8
RpFvuvzmrQ==";
q =
@"2XFF/B9pGdpSqmw+eSU1IHUaqQo6Sa9J2/F7dIs+/GMhC/TRZ5SHYLrfRrhEIGvIyG4CSeRTdChs
tnHve3NR6Q==";
dp =
@"FzDaPLCHNzk7Mq7xQjQTVKsk5wp2fawsOwS1IbiPrYS8B3rJhb/0+U2pjGNWH5lLaxY9RTIO4D8W
pqCpWtwCGQ==";
dq =
@"poREYAt95Tp4S+KRBR0lTjHftMwMTxlZqoGHVXy9Q3J2gD1/j58C/WSeT/4Uze8816DHR+b+sdmz
RxSBnTx24Q==";
inverse =
@"2VY9lcVhg1CJ+b1UjM5tOZ0dZqP6pIBVfhEXWLwnfOJyFc7CHqkUIBwtb4VqvCbhi8ZPG56yUXpw
7MYMX17R3w==";
d =
@"J3OMy5vJJLpsxgTOqL4jXn9sXT7lRj4QvIY0zq8xfgPUbWhVpCzOwHLpi45ktJOUYEOb2nQZUcpN
qY/UJy35EF/hVv6QBNJ7NF8qx1mpqxCO+9x2lLrT5nFcV3C9O9rlsU3hfriNtuFgMLicM8Fcqfnf
Z08nS0FwRYQuyxwe8WE=";

clearText = "this is the guid that i want to encrypt";

try
{
string cipherText = DoEncrypt(clearText, exponent, modulus,
p, q, dp, dq, inverse, d);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message );
}


//Here is the DoEncrypt function

public static string DoEncrypt(string cipherText, string Exponent,
string Modulus, string p, string q, string dp, string dq, string inverse,
string d)
{

string strRetval = "";
try
{

byte[] enecryptedData;

UnicodeEncoding ByteConverter = new UnicodeEncoding();

RSACryptoServiceProvider rsaDoDecrypt = new
RSACryptoServiceProvider();
RSAParameters rsaParamsPublic = new RSAParameters();

rsaParamsPublic.Exponent = ByteConverter.GetBytes(Exponent);
rsaParamsPublic.Modulus = ByteConverter.GetBytes(Modulus);
rsaParamsPublic.P = ByteConverter.GetBytes(p);
rsaParamsPublic.Q = ByteConverter.GetBytes(q);
rsaParamsPublic.DP = ByteConverter.GetBytes(dp);
rsaParamsPublic.DQ = ByteConverter.GetBytes(dq);
rsaParamsPublic.InverseQ = ByteConverter.GetBytes(inverse);
rsaParamsPublic.D = ByteConverter.GetBytes(d);

//the exception happens on the line below
rsaDoDecrypt.ImportParameters(rsaParamsPublic);

using (rsaDoDecrypt)
{
byte[] dataToEncrypt = ByteConverter.GetBytes(cipherText);
enecryptedData = rsaDoDecrypt.Encrypt(dataToEncrypt,
On Monday, February 15, 2010 7:24 AM TimLeung wrote:
I think that I can answer my own question using the ImportCspBlob method.

This method is supported in the compact framework and I think that I ought
to be able to achieve what I want to do by using this approach instead.

http://msdn.microsoft.com/en-us/lib...y.rsacryptoserviceprovider.importcspblob.aspx



"TimLeung" wrote:
Click to expand...
Click to expand...
 
V

vivekanand H

Hi ,

I am trying to encrypt /decrypt in .net compact framework.
I am trying to get Public key by using CryptDecodeObject()
but giving me exception. ( can't find entry for pInvoke)

Please let me know what is solution.

I am trying to use RSA encryption in the compact framework (v2.0) and hope
that someone can help me.

I have been working off the MSDN example which can be found here:

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsacryptoserviceprovider.aspx

In order to load key information, a method called FromXmlString is used.

http://msdn.microsoft.com/en-us/library/system.security.cryptography.rsa.fromxmlstring.aspx

The problem I have is that FromXmlString is not supported in the compact
framework so I need some help in working out how to load the keys without the
use of this method.

I have pregenerated some keys and have saved them out using the ToXmlString
method. The XML can be found below.

Here is the code that I am trying to use to encrypt the data. When I call the
ImportParameters method, I get a "Bad Data" exception. Can someone work out
what is wrong with this code or point me to to a working example?

Thanks in advance,
Tim



string p, q, dp, dq, inverse, d, exponent, modulus, clearText;

exponent = @"AQAB";
modulus =
@"1fHlrCs61j0VAIVMsfTcJnF51tisdL+PXBqMt971M3CZOUZJhEyTdlgJoIv8FJif41wg646fS8O+
PoWz7lX3ioyN2AhkTtvEpude5zJGBXEAjOMErhag1ILQTNu+8vqF2hxgBd5pPk/fJOAa9+gM8Pf7
CebNPBSX4zLzzvPhsHU=";
p =
@"++HaZBLVTwRCsMDzvrhdXou73wzgsfa/OSVBsasJgcHIr2y9EvwgowdVXR7oc1/tLc5KpW8TMIi8
RpFvuvzmrQ==";
q =
@"2XFF/B9pGdpSqmw+eSU1IHUaqQo6Sa9J2/F7dIs+/GMhC/TRZ5SHYLrfRrhEIGvIyG4CSeRTdChs
tnHve3NR6Q==";
dp =
@"FzDaPLCHNzk7Mq7xQjQTVKsk5wp2fawsOwS1IbiPrYS8B3rJhb/0+U2pjGNWH5lLaxY9RTIO4D8W
pqCpWtwCGQ==";
dq =
@"poREYAt95Tp4S+KRBR0lTjHftMwMTxlZqoGHVXy9Q3J2gD1/j58C/WSeT/4Uze8816DHR+b+sdmz
RxSBnTx24Q==";
inverse =
@"2VY9lcVhg1CJ+b1UjM5tOZ0dZqP6pIBVfhEXWLwnfOJyFc7CHqkUIBwtb4VqvCbhi8ZPG56yUXpw
7MYMX17R3w==";
d =
@"J3OMy5vJJLpsxgTOqL4jXn9sXT7lRj4QvIY0zq8xfgPUbWhVpCzOwHLpi45ktJOUYEOb2nQZUcpN
qY/UJy35EF/hVv6QBNJ7NF8qx1mpqxCO+9x2lLrT5nFcV3C9O9rlsU3hfriNtuFgMLicM8Fcqfnf
Z08nS0FwRYQuyxwe8WE=";

clearText = "this is the guid that i want to encrypt";

try
{
string cipherText = DoEncrypt(clearText, exponent, modulus,
p, q, dp, dq, inverse, d);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message );
}


//Here is the DoEncrypt function

public static string DoEncrypt(string cipherText, string Exponent,
string Modulus, string p, string q, string dp, string dq, string inverse,
string d)
{

string strRetval = "";
try
{

byte[] enecryptedData;

UnicodeEncoding ByteConverter = new UnicodeEncoding();

RSACryptoServiceProvider rsaDoDecrypt = new
RSACryptoServiceProvider();
RSAParameters rsaParamsPublic = new RSAParameters();

rsaParamsPublic.Exponent = ByteConverter.GetBytes(Exponent);
rsaParamsPublic.Modulus = ByteConverter.GetBytes(Modulus);
rsaParamsPublic.P = ByteConverter.GetBytes(p);
rsaParamsPublic.Q = ByteConverter.GetBytes(q);
rsaParamsPublic.DP = ByteConverter.GetBytes(dp);
rsaParamsPublic.DQ = ByteConverter.GetBytes(dq);
rsaParamsPublic.InverseQ = ByteConverter.GetBytes(inverse);
rsaParamsPublic.D = ByteConverter.GetBytes(d);

//the exception happens on the line below
rsaDoDecrypt.ImportParameters(rsaParamsPublic);

using (rsaDoDecrypt)
{
byte[] dataToEncrypt = ByteConverter.GetBytes(cipherText);
enecryptedData = rsaDoDecrypt.Encrypt(dataToEncrypt,
On Monday, February 15, 2010 7:24 AM TimLeung wrote:
I think that I can answer my own question using the ImportCspBlob method.

This method is supported in the compact framework and I think that I ought
to be able to achieve what I want to do by using this approach instead.

http://msdn.microsoft.com/en-us/lib...y.rsacryptoserviceprovider.importcspblob.aspx



"TimLeung" wrote:
Click to expand...
Click to expand...
 

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