[Cryptlib] Problems creating RC5 context

[Александр Комратов]

Hi, everybody!

I'm testing Cryptlib 3.4.3 under Windows in project using x64 platform
and MS Visual Studio 2013

I've got a strange malfunction.

I'm trying to use encryption using RC5 algorythm as a source of
pseudo-random data for further usage.


CRYPT_CONTEXT rc4;

this->cl_err = cryptCreateContext( &rc4, CRYPT_UNUSED, CRYPT_ALGO_RC5);
if (this->cl_err) { free(tmp); CL_IRET("nllCryptlibCenter::GetRandom()",
"ERROR(%u) cryptCreateContext() failed with emsg = \"%s\"", 4,
this->last_err, NSB_LOG_LEVEL_NORMAL); };

this->cl_err = cryptSetAttribute(rc4,CRYPT_CTXINFO_KEYSIZE,104);
if (this->cl_err) { free(tmp); CL_IRET("nllCryptlibCenter::GetRandom()",
"ERROR(%u) cryptSetAttribute() failed with emsg = \"%s\"", 5,
this->last_err, NSB_LOG_LEVEL_NORMAL); };

this->cl_err = cryptGenerateKey(rc4);
if (this->cl_err) { free(tmp); CL_IRET("nllCryptlibCenter::GetRandom()",
"ERROR(%u) cryptGenerateKey() failed with emsg = \"%s\"", 6,
this->last_err, NSB_LOG_LEVEL_NORMAL); };

this->cl_err = cryptEncrypt(rc4,tmp,(int) size);
if (this->cl_err) { free(tmp); CL_IRET("nllCryptlibCenter::GetRandom()",
"ERROR(%u) cryptEncrypt() failed with emsg = \"%s\"", 7, this->last_err,
NSB_LOG_LEVEL_NORMAL); };

this->cl_err = cryptDestroyContext(rc4);
if (this->cl_err) { free(tmp); CL_IRET("nllCryptlibCenter::GetRandom()",
"ERROR(%u) cryptDestroyContext() failed with emsg = \"%s\"", 8,
this->last_err, NSB_LOG_LEVEL_NORMAL); };

The quoted code is working good only once.
And even though I'm every time destroing context, the next time I get an
error in cryptCreateContext() -11 "Data has not been initialised"

What's wrong?

Thanks for any help.

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[Peter Gutmann]

The quoted code is working good only once. And even though I'm every time
destroing context, the next time I get an error in cryptCreateContext() -11
"Data has not been initialised"

Can you send me the exact code needed to reproduce the problem? When I run
the code you posted it works as expected...

Peter.

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