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; }