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POGenerate session key based on PUBLICKEYBLOB / PRIVATEKEYBLOB
 

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    <p>My code looks like this, I traced each undefined method here to the functions called with relevant arguments included.</p> <p>I have a hard time wrapping my head around the API. So what I have here is that I can generate public/private keys, and I can generate <strong>a</strong> session key, but how can I generate a session key based on the public key? What am I missing/assuming (wrong) here?</p> <pre><code> void Crypto::GenerateKeyPair( Buffer& publicKey, Buffer& privateKey ) throw(WinError) { /* CryptAcquireContext ( PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) */ CryptContext context = CryptoProviders::NewContext(PROV_RSA_FULL, CRYPT_VERIFYCONTEXT); /* CryptGenKey( AT_KEYEXCHANGE, CRYPT_EXPORTABLE, &key) */ CryptKey key = context.GenerateKeyExchangePair(); /* CryptExportKey( PUBLICKEYBLOB, pPub); */ key.ExportPublicKey(publicKey); /* CryptExportKey( PRIVATEKEYBLOB, pPriv); */ key.ExportPrivateKey(privateKey); } void Crypto::GenerateSessionKey( Buffer& sessionKey ) throw(WinError) { /* CryptAcquireContext ( PROV_RSA_FULL, 0 ) */ CryptContext context = CryptoProviders::NewContext(PROV_RSA_FULL, 0); /* CryptGenKey( CALG_RC4, CRYPT_EXPORTABLE ) */ /* CryptGetUserKey( AT_KEYEXCHANGE ) */ /* CryptExportKey( SIMPLEBLOB ) */ context.GenerateSessionKey(sessionKey); } void Crypto::EncryptData( const Buffer& publicKey, const Buffer& plaintext, Buffer& encrypted ) { /* CryptAcquireContext ( PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) */ CryptContext hProvider(PROV_RSA_FULL, CRYPT_VERIFYCONTEXT); /* CryptImportKey( 0 ) */ CryptKey key = hProvider.ImportKey(publicKey); /* CryptEncrypt() */ key.Encrypt(plaintext, encrypted); } void Crypto::DecryptData( const Buffer& privateKey, const Buffer& encrypted, Buffer& plaintext ) { /* CryptAcquireContext ( PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) */ CryptContext hProvider(PROV_RSA_FULL, CRYPT_VERIFYCONTEXT); /* CryptImportKey( 0 ) */ CryptKey key = hProvider.ImportKey(privateKey); /* CryptDecrypt() */ key.Decrypt(encrypted, plaintext); } </code></pre>
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