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Routine: PRCFDES2

PRCFDES2.m

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  1. PRCFDES2 ;WISC/LEM-ESIG MAINTENANCE ROUTINE ;1/19/93 1:05 PM
  1. V ;;5.1;IFCAP;;Oct 20, 2000
  1. ;Per VHA Directive 10-93-142, this routine should not be modified.
  1. ;ROUTINE FOR MAINTAINING FIELD 62 (COMPLETED BY ELEC SIG), FILE 421.5
  1. DECODE(LEVEL0) ;Extrinsic Function to return hashed electronic sig to readable form.
  1. ;returns "" if unsuccessful
  1. NEW RECORD2,RECORD21,VERSION,PERSON,SIG,CHECKSUM
  1. ;get record and check version
  1. S RECORD2=$G(^PRCF(421.5,LEVEL0,2)) I RECORD2="" QUIT ""
  1. S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
  1. S VERSION=$P(RECORD21,"^",3)
  1. S PERSON=+$P(RECORD2,"^",11)
  1. I VERSION'="",VERSION'=1 Q ""
  1. S SIG=$P(RECORD2,"^",13)
  1. D1 ;decode e signature for version 1
  1. S RECORD=$G(^PRCF(421.5,LEVEL0,0))
  1. S RECORD1=$G(^PRCF(421.5,LEVEL0,1))
  1. S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD1))
  1. QUIT $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
  1. ENCODE(LEVEL0,USERNUM,Y) ;Encode e signature for version 1 only
  1. ;Parameter passing entry point
  1. NEW SIGBLOCK,CHECKSUM,OLDUSER
  1. NEW RECORD,RECORD1,RECORD2,RECORD21
  1. ;get record
  1. S USERNUM=+USERNUM
  1. I USERNUM=0 S Y=-3 QUIT ;-3 no user num available
  1. S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
  1. I SIGBLOCK="" S Y=-2 QUIT ;-2 no sigblock in file 200
  1. S RECORD=$G(^PRCF(421.5,LEVEL0,0))
  1. S RECORD1=$G(^PRCF(421.5,LEVEL0,1))
  1. S RECORD2=$G(^PRCF(421.5,LEVEL0,2))
  1. S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
  1. I RECORD="" S Y=-1 QUIT ;-1 no transaction record
  1. I $P(RECORD2,"^",13)'="" S Y=-4 QUIT ;-4 cannot re-sign record
  1. S OLDUSER=+$P(RECORD2,"^",11)
  1. I OLDUSER=0 S $P(RECORD2,"^",11)=USERNUM
  1. I OLDUSER>0 S USERNUM=OLDUSER
  1. S:$P(RECORD21,"^",6)="" $P(RECORD21,"^",6)=$$NOW^PRCUESIG
  1. S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD1))
  1. S $P(RECORD2,"^",13)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
  1. S $P(RECORD21,"^",3,4)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
  1. S ^PRCF(421.5,LEVEL0,2)=RECORD2
  1. S ^PRCF(421.5,LEVEL0,2.1)=RECORD21
  1. S Y=1 QUIT
  1. REMOVE(LEVEL0) ;Entry point to remove e signature from record
  1. ;NOT an extrinsic function
  1. NEW RECORD2,RECORD21,I
  1. S RECORD2=$G(^PRCF(421.5,LEVEL0,2))
  1. S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
  1. F I=11,13 S $P(RECORD2,"^",I)=""
  1. F I=4,6 S $P(RECORD21,"^",I)=""
  1. S ^PRCF(421.5,LEVEL0,2)=RECORD2
  1. S ^PRCF(421.5,LEVEL0,2.1)=RECORD21
  1. QUIT
  1. VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
  1. NEW RECORD21,VERSION,SIGBLOCK
  1. ;get record variables
  1. S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
  1. S VERSION=$P(RECORD21,"^",3),SIGBLOCK=$P(RECORD21,"^",4)
  1. I VERSION_SIGBLOCK="" QUIT 1
  1. QUIT ($$SUM^PRCUESIG($$DECODE(LEVEL0))=SIGBLOCK)
  1. STRING(X,X1) ;Build String of critical fields
  1. NEW RECORD,RECORD1
  1. Q $P(X,"^",1)_"^"_$P(X,"^",3)_"^"_$P(X,"^",4)_"^"_$P(X,"^",8)_"^"_$P(X,"^",15)_"^"_$P(X1,"^",3)