Re: [Cdsa-dev] problem whith CSSM_WrapKey. help me, please.

[Tom W. <woo...@zk...>]

Pietro,

What you are trying to do works fine for me.  I have one program
that generates an RSA key pair and then uses the public key to wrap
a DES key.  That same public key is hard-coded into a second program
which also uses it to wrap a DES key.  Both work fine.

Here are two things to check in your program:

    1.  Check the way that you re-construct the public key from
        the file.  Here is how I did it:
    
    memset(&PubKey, 0, sizeof PubKey);
    PubKey.KeyHeader.HeaderVersion        = CSSM_KEYHEADER_VERSION;
    PubKey.KeyHeader.BlobType             = CSSM_KEYBLOB_RAW;
    PubKey.KeyHeader.Format               = CSSM_KEYBLOB_RAW_FORMAT_PKCS1;
    PubKey.KeyHeader.AlgorithmId          = CSSM_ALGID_RSA;
    PubKey.KeyHeader.KeyClass             = CSSM_KEYCLASS_PUBLIC_KEY;
    PubKey.KeyHeader.LogicalKeySizeInBits = 512;
    PubKey.KeyHeader.KeyUsage             = CSSM_KEYUSE_WRAP;
    PubKey.KeyHeader.WrapAlgorithmId      = CSSM_ALGID_NONE;

    uint8 PubKeyBits[] = { ... };
    PubKey.KeyData.Length = sizeof PubKeyBits;
    PubKey.KeyData.Data   = PubKeyBits;
    
    2.  Initialize the entire WrappedKey structure to 0 before
        passing it to CSSM_WrapKey(), for example:
        
    memset(&WrappedKey, 0, sizeof WrappedKey);
    
I will send you a copy of my program in a separate e-mail.

Regards,

Tom