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 decryptFEEDExp(feeCipherFile cipherFile,
feePubKey recvPrivKey,
feePubKey sendPubKey, // optional
unsigned char **plainText, // RETURNED
unsigned *plainTextLen, // RETURNED
feeSigStatus *sigStatus) // RETURNED
{
feeReturn frtn = FR_Success;
unsigned char *cipherText = NULL;
unsigned cipherTextLen;
feeFEEDExp feed = NULL;
unsigned char *sigData = NULL;
unsigned sigDataLen;
unsigned char *sendPubKeyStr = NULL;
unsigned sendPubKeyStrLen = 0;
feePubKey parsedSendPubKey = NULL;
if(feeCFileEncrType(cipherFile) != CFE_FEEDExp) {
frtn = FR_Internal;
goto out;
}
/*
* Get ciphertext from cipherFile
*/
cipherText = feeCFileCipherText(cipherFile, &cipherTextLen);
if(cipherText == NULL) {
frtn = FR_BadCipherFile;
goto out;
}
/*
* FEEDExp decrypt
*/
feed = feeFEEDExpNewWithPubKey(recvPrivKey, NULL, NULL);
if(feed == NULL) {
frtn = FR_BadPubKey;
goto out;
}
frtn = feeFEEDExpDecrypt(feed,
cipherText,
cipherTextLen,
plainText,
plainTextLen);
if(frtn) {
goto out;
}
sigData = feeCFileSigData(cipherFile, &sigDataLen);
if(sigData) {
feeReturn sigFrtn;
if(sendPubKey == NULL) {
/*
* use embedded sender's public key
*/
sendPubKeyStr = feeCFileSendPubKeyData(cipherFile,
&sendPubKeyStrLen);
if(sendPubKeyStr == NULL) {
frtn = FR_BadCipherFile;
goto out;
}
parsedSendPubKey = feePubKeyAlloc();
frtn = feePubKeyInitFromKeyString(parsedSendPubKey,
(char *)sendPubKeyStr, sendPubKeyStrLen);
if(frtn) {
frtn = FR_BadCipherFile;
goto out;
}
sendPubKey = parsedSendPubKey;
}
sigFrtn = feePubKeyVerifySignature(sendPubKey,
cipherText,
cipherTextLen,
sigData,
sigDataLen);
switch(sigFrtn) {
case FR_Success:
*sigStatus = SS_PresentValid;
break;
default:
*sigStatus = SS_PresentInvalid;
break;
}
}
else {
*sigStatus = SS_NotPresent;
}
out:
if(cipherText) {
ffree(cipherText);
}
if(feed) {
feeFEEDExpFree(feed);
}
if(sigData) {
ffree(sigData);
}
if(parsedSendPubKey) {
feePubKeyFree(parsedSendPubKey);
}
if(sendPubKeyStr) {
ffree(sendPubKeyStr);
}
return frtn;
}