- PRCHES11 ;WISC/RHD/AKS-ESIG MAINTENANCE ROUTINE ; 1/4/93 11:04 AM
- V ;;5.1;IFCAP;;Oct 20, 2000
- ;Per VHA Directive 10-93-142, this routine should not be modified.
- ;ROUTINE FOR MAINTAINING FIELD 3 (ELECTRONIC SIGNATURE), FILE 443
- DECODE(LEVEL0) ;Extrinsic Function to return hashed esig to readable form.
- ;returns "" if unsuccessful
- NEW RECORD,RECORD1,RECORD12,VERSION,PERSON,SIG,CHECKSUM
- S RECORD=$G(^PRC(443,LEVEL0,0)) I RECORD="" Q ""
- S VERSION=$P(RECORD,"^",14)
- S PERSON=+$P(RECORD,"^",2)
- I VERSION'="",VERSION'=1 Q ""
- S SIG=$P(RECORD,"^",3)
- D1 ;decode e signature for version 1
- S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD))
- Q $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
- ENCODE(LEVEL0,USERNUM,Y) ;Encode esig for version 1 only
- NEW RECORD,SIGBLOCK,CHECKSUM,OLDUSER
- S USERNUM=+USERNUM
- I USERNUM=0 S Y=-3 Q ;-3 no user number
- S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
- I SIGBLOCK="" S Y=-2 Q ;-2 no signature block
- S RECORD=$G(^PRC(443,LEVEL0,0))
- I RECORD="" S Y=-1 Q ;-1 no record
- I $P(RECORD,"^",3)'="" S Y=-4 Q ;-4 cannot re-sign record
- S OLDUSER=+$P(RECORD,"^",2)
- I OLDUSER=0 S $P(RECORD,"^",2)=USERNUM
- I OLDUSER>0 S USERNUM=OLDUSER
- S:$P(RECORD,"^",4)="" $P(RECORD,"^",4)=$$NOW^PRCUESIG
- S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD))
- S $P(RECORD,"^",3)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
- S $P(RECORD,"^",14)=1,$P(RECORD,"^",13)=$$SUM^PRCUESIG(SIGBLOCK)
- S ^PRC(443,LEVEL0,0)=RECORD
- S Y=1 Q
- REMOVE(LEVEL0) ;Entry point to remove esig
- NEW I,RECORD
- S RECORD=$G(^PRC(443,LEVEL0,0))
- F I=2,3,4,13 S $P(RECORD,"^",I)=""
- S ^PRC(443,LEVEL0,0)=RECORD
- Q
- VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
- NEW RECORD,VERSION,SIGBLOCK
- S RECORD=$G(^PRC(443,LEVEL0,0))
- S VERSION=$P(RECORD,"^",14),SIGBLOCK=$P(RECORD,"^",13)
- I VERSION_SIGBLOCK="" Q 1
- Q ($$SUM^PRCUESIG($$DECODE(LEVEL0))=SIGBLOCK)
- STRING(X) ;Build String of critical fields
- Q $P(X,"^")_"^"_$P(X,"^",4)_"^"_$P(X,"^",9)
- --- Routine Detail --- with STRUCTURED ROUTINE LISTING ---[H[J[2J[HPRCHES11 2050 printed Jan 18, 2025@03:08:29 Page 2
- PRCHES11 ;WISC/RHD/AKS-ESIG MAINTENANCE ROUTINE ; 1/4/93 11:04 AM
- V ;;5.1;IFCAP;;Oct 20, 2000
- +1 ;Per VHA Directive 10-93-142, this routine should not be modified.
- +2 ;ROUTINE FOR MAINTAINING FIELD 3 (ELECTRONIC SIGNATURE), FILE 443
- DECODE(LEVEL0) ;Extrinsic Function to return hashed esig to readable form.
- +1 ;returns "" if unsuccessful
- +2 NEW RECORD,RECORD1,RECORD12,VERSION,PERSON,SIG,CHECKSUM
- +3 SET RECORD=$GET(^PRC(443,LEVEL0,0))
- IF RECORD=""
- QUIT ""
- +4 SET VERSION=$PIECE(RECORD,"^",14)
- +5 SET PERSON=+$PIECE(RECORD,"^",2)
- +6 IF VERSION'=""
- IF VERSION'=1
- QUIT ""
- +7 SET SIG=$PIECE(RECORD,"^",3)
- D1 ;decode e signature for version 1
- +1 SET CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD))
- +2 QUIT $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
- ENCODE(LEVEL0,USERNUM,Y) ;Encode esig for version 1 only
- +1 NEW RECORD,SIGBLOCK,CHECKSUM,OLDUSER
- +2 SET USERNUM=+USERNUM
- +3 ;-3 no user number
- IF USERNUM=0
- SET Y=-3
- QUIT
- +4 SET SIGBLOCK=$PIECE($GET(^VA(200,USERNUM,20)),"^",2)
- +5 ;-2 no signature block
- IF SIGBLOCK=""
- SET Y=-2
- QUIT
- +6 SET RECORD=$GET(^PRC(443,LEVEL0,0))
- +7 ;-1 no record
- IF RECORD=""
- SET Y=-1
- QUIT
- +8 ;-4 cannot re-sign record
- IF $PIECE(RECORD,"^",3)'=""
- SET Y=-4
- QUIT
- +9 SET OLDUSER=+$PIECE(RECORD,"^",2)
- +10 IF OLDUSER=0
- SET $PIECE(RECORD,"^",2)=USERNUM
- +11 IF OLDUSER>0
- SET USERNUM=OLDUSER
- +12 if $PIECE(RECORD,"^",4)=""
- SET $PIECE(RECORD,"^",4)=$$NOW^PRCUESIG
- +13 SET CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD))
- +14 SET $PIECE(RECORD,"^",3)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
- +15 SET $PIECE(RECORD,"^",14)=1
- SET $PIECE(RECORD,"^",13)=$$SUM^PRCUESIG(SIGBLOCK)
- +16 SET ^PRC(443,LEVEL0,0)=RECORD
- +17 SET Y=1
- QUIT
- REMOVE(LEVEL0) ;Entry point to remove esig
- +1 NEW I,RECORD
- +2 SET RECORD=$GET(^PRC(443,LEVEL0,0))
- +3 FOR I=2,3,4,13
- SET $PIECE(RECORD,"^",I)=""
- +4 SET ^PRC(443,LEVEL0,0)=RECORD
- +5 QUIT
- VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
- +1 NEW RECORD,VERSION,SIGBLOCK
- +2 SET RECORD=$GET(^PRC(443,LEVEL0,0))
- +3 SET VERSION=$PIECE(RECORD,"^",14)
- SET SIGBLOCK=$PIECE(RECORD,"^",13)
- +4 IF VERSION_SIGBLOCK=""
- QUIT 1
- +5 QUIT ($$SUM^PRCUESIG($$DECODE(LEVEL0))=SIGBLOCK)
- STRING(X) ;Build String of critical fields
- +1 QUIT $PIECE(X,"^")_"^"_$PIECE(X,"^",4)_"^"_$PIECE(X,"^",9)