//-------------------------------------------------------------------------
// Verifies the authentication response of a user token.
//
// 'copr' - Structure for holding coprocessor information.
// 'user' - Structure for holding user token information.
// 'chlg' - 3-byte buffer of challenge data.
// 'doBind' - if true, the user's unique secret is recreated on the
// coprocessor. If this function is called multiple times,
// it is acceptable to skip the bind for all calls after
// the first on the same user token.
//
// Return: If TRUE, the user's authentication response matched exactly the
// signature generated by the coprocessor.
// If FALSE, an error occurred or the signature did not match.
//
SMALLINT VerifyAuthResponse(SHACopr* copr, SHAUser* user,
uchar* chlg, SMALLINT doBind)
{
int addr = copr->wspcPageNumber << 5;
int wcc = user->writeCycleCounter;
uchar sign_cmd;
uchar scratchpad[32];
uchar fullBindCode[15];
memset(scratchpad, 0x00, 32);
memset(fullBindCode, 0x0FF, 15);
// format the bind code properly
if(user->devAN[0]==0x18)
{
// Format for DS1963S
memcpy(fullBindCode, copr->bindCode, 4);
memcpy(&fullBindCode[12], &(copr->bindCode[4]), 3);
// use ValidateDataPage command
sign_cmd = SHA_VALIDATE_DATA_PAGE;
// copy wcc LSB first
if(!IntToBytes(&scratchpad[8], 4, wcc))
OWERROR(OWERROR_NO_ERROR_SET);
}
else if(user->devAN[0]==0x33||user->devAN[0]==0xB3)
{
// Leave bindCode FF for DS1961S
// Use AuthenticateHost command
sign_cmd = SHA_AUTHENTICATE_HOST;
// the user doesn't have a write cycle counter
memset(&scratchpad[8], 0x0FF, 4);
}
else
{
OWERROR(OWERROR_WRONG_TYPE);
return FALSE;
}
// the pagenumber
fullBindCode[4] = (uchar)user->accountPageNumber;
// and 7 bytes of the address of current device
memcpy(&fullBindCode[5], user->devAN, 7);
// get the user address and page num from fullBindCode
memcpy(&scratchpad[12], &fullBindCode[4], 8);
// set the same challenge bytes
memcpy(&scratchpad[20], chlg, 3);
// set the serial number to that of the coprocessor
owSerialNum(copr->portnum, copr->devAN, FALSE);
// install user's unique secret on the wspc secret
if(doBind)
{
OWASSERT( BindSecretToiButton18(copr->portnum,
copr->authPageNumber,
copr->wspcPageNumber&7,
copr->bindData, fullBindCode, FALSE),
OWERROR_BIND_SECRET_FAILED, FALSE );
if(user->devAN[0]==0x33||user->devAN[0]==0xB3)
{
// also copy the resulting secret into secret location 0, to
// replace the signing secret. Necessary for producing the
// DS1961S's write-authorization MAC.
OWASSERT( CopySecretSHA18(copr->portnum, 0),
OWERROR_COPY_SECRET_FAILED, FALSE);
}
}
// recreate the signature and verify
OWASSERT( WriteDataPageSHA18(copr->portnum, copr->wspcPageNumber,
user->accountFile, doBind),
OWERROR_WRITE_DATA_PAGE_FAILED, FALSE );
OWASSERT( WriteScratchpadSHA18(copr->portnum, addr, scratchpad, 32, TRUE),
OWERROR_WRITE_SCRATCHPAD_FAILED, FALSE );
OWASSERT( SHAFunction18(copr->portnum, sign_cmd, addr, TRUE),
OWERROR_SHA_FUNCTION_FAILED, FALSE );
OWASSERT( MatchScratchpadSHA18(copr->portnum,
user->responseMAC, TRUE),
OWERROR_MATCH_SCRATCHPAD_FAILED, FALSE );
return TRUE;
}
//-------------------------------------------------------------------------
// Installs new service data on a user token.
//
// 'copr' - Structure for holding coprocessor information.
// 'user' - Structure for holding user token information.
// 'secret' - the authentication secret to install on user token.
//
// Return: If TRUE, new service installation succeeded.
// If FALSE, an error occurred.
//
SMALLINT InstallServiceData(SHACopr* copr, SHAUser* user,
uchar* secret, int secret_length,
int initialBalance)
{
short handle;
int maxwrite;
FileEntry fe;
uchar fullBindCode[15];
//make sure user has a file directory structure
memcpy(fe.Name, copr->serviceFilename, 4);
fe.Ext = copr->serviceFilename[4];
// install master authentication secret
if(user->devAN[0]==0x18)
{
//need to format the device
if(!owFormat(user->portnum, user->devAN))
return FALSE;
//and create an empty stub for his account information
if(!owCreateFile(user->portnum, user->devAN,
&maxwrite, &handle, &fe))
return FALSE;
//need to know what page the stub is on
user->accountPageNumber = fe.Spage;
// set the serial number to that of the user
owSerialNum(user->portnum, user->devAN, FALSE);
OWASSERT( InstallSystemSecret18(user->portnum,
user->accountPageNumber,
user->accountPageNumber&7,
secret, secret_length, FALSE),
OWERROR_INSTALL_SECRET_FAILED, FALSE );
}
else if((user->devAN[0]&0x7F)==0x33)
{
// set the serial number to that of the user
owSerialNum(user->portnum, user->devAN, FALSE);
//because of copy-authorization, we need to install the
//secret first on the DS1961S and _then_ format the system
OWASSERT( InstallSystemSecret33(user->portnum,
0,
0,
secret, secret_length, FALSE),
OWERROR_INSTALL_SECRET_FAILED, FALSE );
//need to format the device
if(!owFormat(user->portnum, user->devAN))
return FALSE;
//and create an empty stub for his account information
if(!owCreateFile(user->portnum, user->devAN,
&maxwrite, &handle, &fe))
return FALSE;
//need to know what page the stub is on
user->accountPageNumber = fe.Spage;
}
else
{
return FALSE;
}
// format the bind code properly
// first four bytes of bind code
memcpy(fullBindCode, copr->bindCode, 4);
// followed by the pagenumber
fullBindCode[4] = (uchar)user->accountPageNumber;
// and 7 bytes of the address of current device
memcpy(&fullBindCode[5], user->devAN, 7);
// followed by the last 3 bytes of bind code
memcpy(&fullBindCode[12], &(copr->bindCode[4]), 3);
// create a unique secret for iButton
if(user->devAN[0]==0x18)
{
DebitFile* accountFile = (DebitFile*)user->accountFile;
OWASSERT( BindSecretToiButton18(user->portnum,
user->accountPageNumber,
user->accountPageNumber&7,
copr->bindData, fullBindCode, TRUE),
OWERROR_BIND_SECRET_FAILED, FALSE );
// do a read just to get value of writecycle counter
user->writeCycleCounter = ReadAuthPageSHA18(user->portnum,
user->accountPageNumber,
user->accountFile,
NULL,
TRUE);
//setup user account file with initial balance
IntToBytes(accountFile->balanceBytes,3,initialBalance);
// set transaction ID
accountFile->transID[0] = 0;
accountFile->transID[0] = 0;
}
else if((user->devAN[0]&0x7F)==0x33)
{
DebitFile33* accountFile33 = (DebitFile33*)user->accountFile;
OWASSERT( BindSecretToiButton33(user->portnum,
user->accountPageNumber,
0,
copr->bindData, fullBindCode, TRUE),
OWERROR_BIND_SECRET_FAILED, FALSE );
// Call VerifyUser just to get the user's secret in wspc
if(!VerifyUser(copr, user, TRUE))
return FALSE;
//Record A
//setup user account file with initial balance
IntToBytes(accountFile33->balanceBytes_A,3,initialBalance);
// set transaction ID
accountFile33->transID_A[0] = 0;
accountFile33->transID_A[0] = 0;
//Record B
//setup user account file with initial balance
IntToBytes(accountFile33->balanceBytes_B,3,initialBalance);
// set transaction ID
accountFile33->transID_B[0] = 0;
accountFile33->transID_B[0] = 0;
}
//sign the data with coprocessor and write it out
return UpdateServiceData(copr, user);
}