int GWEN_Padd_UnapplyPaddAlgo(const GWEN_CRYPT_PADDALGO *a, GWEN_BUFFER *buf) {
int rv;
GWEN_CRYPT_PADDALGOID aid;
assert(a);
assert(buf);
aid=GWEN_Crypt_PaddAlgo_GetId(a);
DBG_INFO(GWEN_LOGDOMAIN, "Unpadding with algo \"%s\"",
GWEN_Crypt_PaddAlgoId_toString(aid));
switch(aid) {
case GWEN_Crypt_PaddAlgoId_None:
rv=0;
break;
case GWEN_Crypt_PaddAlgoId_Pkcs1_1:
rv=GWEN_Padd_UnpaddWithPkcs1Bt1(buf);
break;
case GWEN_Crypt_PaddAlgoId_Pkcs1_2:
rv=GWEN_Padd_UnpaddWithPkcs1Bt2(buf);
break;
case GWEN_Crypt_PaddAlgoId_AnsiX9_23:
return GWEN_Padd_UnpaddWithAnsiX9_23(buf);
case GWEN_Crypt_PaddAlgoId_Iso9796_2:
return GWEN_Padd_UnpaddWithIso9796_2(buf);
case GWEN_Crypt_PaddAlgoId_Iso9796_1:
case GWEN_Crypt_PaddAlgoId_LeftZero:
case GWEN_Crypt_PaddAlgoId_RightZero:
case GWEN_Crypt_PaddAlgoId_Iso9796_1A4:
default:
DBG_INFO(GWEN_LOGDOMAIN, "Algo-Type %d (%s) not supported",
aid, GWEN_Crypt_PaddAlgoId_toString(aid));
return GWEN_ERROR_NOT_AVAILABLE;
}
if (rv) {
DBG_ERROR(GWEN_LOGDOMAIN, "Error padding with algo %d (%s)",
aid, GWEN_Crypt_PaddAlgoId_toString(aid));
return GWEN_ERROR_GENERIC;
}
return rv;
}
int GWEN_Crypt_PaddAlgo_toDb(const GWEN_CRYPT_PADDALGO *a, GWEN_DB_NODE *db)
{
assert(a);
assert(a->refCount);
GWEN_DB_SetCharValue(db, GWEN_DB_FLAGS_OVERWRITE_VARS,
"id",
GWEN_Crypt_PaddAlgoId_toString(a->id));
GWEN_DB_SetIntValue(db, GWEN_DB_FLAGS_OVERWRITE_VARS,
"paddSize", a->paddSize);
return 0;
}
int GWEN_Padd_ApplyPaddAlgo(const GWEN_CRYPT_PADDALGO *a, GWEN_BUFFER *buf) {
int rv;
unsigned int diff;
unsigned int bsize;
unsigned int dstSize;
unsigned int chunkSize;
GWEN_CRYPT_PADDALGOID aid;
assert(a);
assert(buf);
aid=GWEN_Crypt_PaddAlgo_GetId(a);
if (aid==GWEN_Crypt_PaddAlgoId_None)
/* short return if there is no padding to be done */
return 0;
chunkSize=GWEN_Crypt_PaddAlgo_GetPaddSize(a);
if (chunkSize==0) {
DBG_ERROR(GWEN_LOGDOMAIN, "Invalid chunk size (0)");
return GWEN_ERROR_INVALID;
}
bsize=GWEN_Buffer_GetUsedBytes(buf);
dstSize=bsize+(chunkSize-1);
dstSize=(dstSize/chunkSize)*chunkSize;
diff=dstSize-bsize;
DBG_INFO(GWEN_LOGDOMAIN, "Padding with algo \"%s\"",
GWEN_Crypt_PaddAlgoId_toString(aid));
switch(aid) {
case GWEN_Crypt_PaddAlgoId_None:
rv=0;
break;
case GWEN_Crypt_PaddAlgoId_Iso9796_1A4:
if (dstSize>96) {
DBG_ERROR(GWEN_LOGDOMAIN,
"Padding size must be <=96 bytes (is %d)",
dstSize);
return GWEN_ERROR_INVALID;
}
rv=GWEN_Padd_PaddWithISO9796(buf);
break;
case GWEN_Crypt_PaddAlgoId_Pkcs1_1:
rv=GWEN_Padd_PaddWithPkcs1Bt1(buf, dstSize);
break;
case GWEN_Crypt_PaddAlgoId_Pkcs1_2:
rv=GWEN_Padd_PaddWithPkcs1Bt2(buf, dstSize);
break;
case GWEN_Crypt_PaddAlgoId_LeftZero:
rv=GWEN_Buffer_FillLeftWithBytes(buf, 0, diff);
break;
case GWEN_Crypt_PaddAlgoId_RightZero:
rv=GWEN_Buffer_FillWithBytes(buf, 0, diff);
break;
case GWEN_Crypt_PaddAlgoId_AnsiX9_23:
return GWEN_Padd_PaddWithAnsiX9_23(buf);
case GWEN_Crypt_PaddAlgoId_Iso9796_2:
return GWEN_Padd_PaddWithIso9796_2(buf, dstSize);
case GWEN_Crypt_PaddAlgoId_Iso9796_1:
default:
DBG_INFO(GWEN_LOGDOMAIN, "Algo-Type %d (%s) not supported",
aid, GWEN_Crypt_PaddAlgoId_toString(aid));
return GWEN_ERROR_NOT_AVAILABLE;
}
if (rv) {
DBG_ERROR(GWEN_LOGDOMAIN, "Error padding with algo %d (%s)",
aid, GWEN_Crypt_PaddAlgoId_toString(aid));
return GWEN_ERROR_GENERIC;
}
return rv;
}
