static feePubKey genPubKey(feePubKey privKey)
{
feePubKey pubKey; // generic key object
feeReturn frtn;
char *pubString;
unsigned pubStringLen;
frtn = feePubKeyCreateKeyString(privKey, &pubString, &pubStringLen);
if(frtn) {
printf("feePubKeyCreateKeyString: Can't get key string (%s)\n",
feeReturnString(frtn));
exit(1);
}
pubKey = feePubKeyAlloc();
frtn = feePubKeyInitFromKeyString(pubKey, pubString, pubStringLen);
if(frtn) {
printf("feePubKeyInitFromKeyString: Can't create new key "
"(%s)\n",
feeReturnString(frtn));
feePubKeyFree(pubKey);
exit(1);
}
ffree(pubString);
return pubKey;
}
feeReturn createFEED(feePubKey sendPrivKey, // required
feePubKey recvPubKey,
const unsigned char *plainText,
unsigned plainTextLen,
int genSig, // 1 ==> generate signature
unsigned userData, // for caller's convenience
feeCipherFile *cipherFile) // RETURNED if successful
{
feeReturn frtn;
feeFEED feed = NULL;
unsigned char *cipherText = NULL;
unsigned cipherTextLen;
unsigned char *sigData = NULL;
unsigned sigDataLen = 0;
feeCipherFile cfile = NULL;
unsigned char *pubKeyString = NULL; // of sendPrivKey
unsigned pubKeyStringLen = 0;
if((sendPrivKey == NULL) || (recvPubKey == NULL)) {
return FR_BadPubKey;
}
/*
* FEED encrypt plaintext
*/
feed = feeFEEDNewWithPubKey(sendPrivKey, recvPubKey, FF_ENCRYPT, NULL, NULL);
if(feed == NULL) {
frtn = FR_BadPubKey;
goto out;
}
frtn = feeFEEDEncrypt(feed,
plainText,
plainTextLen,
&cipherText,
&cipherTextLen);
if(frtn) {
goto out;
}
/*
* Sender's public key string
*/
frtn = feePubKeyCreateKeyString(sendPrivKey,
(char **)&pubKeyString,
&pubKeyStringLen);
if(frtn) {
/*
* Huh?
*/
frtn = FR_BadPubKey;
goto out;
}
if(genSig) {
/*
* We generate signature on ciphertext by convention.
*/
frtn = feePubKeyCreateSignature(sendPrivKey,
cipherText,
cipherTextLen,
&sigData,
&sigDataLen);
if(frtn) {
goto out;
}
}
/*
* Cons up a cipherfile
*/
cfile = feeCFileNewFromCipherText(CFE_FEED,
cipherText,
cipherTextLen,
pubKeyString,
pubKeyStringLen,
NULL,
0,
sigData,
sigDataLen,
userData);
if(cfile == NULL) {
frtn = FR_Internal;
goto out;
}
out:
/* free alloc'd stuff */
if(cipherText) {
ffree(cipherText);
}
if(feed) {
feeFEEDFree(feed);
}
if(pubKeyString) {
ffree(pubKeyString);
}
if(sigData) {
ffree(sigData);
}
*cipherFile = cfile;
return frtn;
}
