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Routine: PRCHES6

PRCHES6.m

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  1. PRCHES6 ;WISC/RHD/AKS-ESIG MAINTENANCE ROUTINE ;8/18/94 3:30 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 SUBFIELD 7 (ELECTRONIC SIGNATURE)
  1. ; FIELD 50 (AMMENDMENT) FILE 442
  1. DECODE(LEVEL0,LEVEL1) ;Extrinsic Function to return hashed electronic sig to readable form.
  1. ;returns "" if unsuccessful
  1. NEW RECORD,RECORD1,VERSION,PERSON,SIG,CHECKSUM
  1. S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0)) I RECORD="" Q ""
  1. S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
  1. S VERSION=$P(RECORD,"^",9)
  1. S PERSON=+$P(RECORD1,"^")
  1. I VERSION'="",VERSION'=1 Q ""
  1. S SIG=$P(RECORD1,"^",2)
  1. D1 ;decode e signature for version 1
  1. S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
  1. Q $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
  1. ENCODE(LEVEL0,LEVEL1,USERNUM,Y) ;Encode e signature for version 1 only
  1. NEW RECORD,RECORD1,SIGBLOCK,CHECKSUM,OLDUSER
  1. S USERNUM=+USERNUM
  1. I USERNUM=0 S Y=-3 Q ;-3 no user number
  1. S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
  1. I SIGBLOCK="" S Y=-2 Q ;-2 no signature block
  1. S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
  1. S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
  1. I RECORD="" S Y=-1 Q ;-1 no 2237 record
  1. I $P(RECORD1,"^",2)'="" S Y=-4 Q ;-4 cannot re-sign record
  1. S OLDUSER=+$P(RECORD1,"^",1)
  1. I OLDUSER=0 S $P(RECORD1,"^",1)=USERNUM
  1. I OLDUSER>0 S USERNUM=OLDUSER
  1. S:$P(RECORD1,"^",3)="" $P(RECORD1,"^",3)=$$NOW^PRCUESIG
  1. S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
  1. S $P(RECORD1,"^",2)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
  1. S $P(RECORD,"^",9,10)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
  1. S ^PRC(442,LEVEL0,6,LEVEL1,0)=RECORD
  1. S ^PRC(442,LEVEL0,6,LEVEL1,1)=RECORD1
  1. S Y=1 Q
  1. RECODE(LEVEL0,LEVEL1,Y) ;Recode ESIG for version 1 only
  1. N RECORD,RECORD1,SIGBLOCK,CHECKSUM,USERNUM
  1. S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
  1. S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
  1. I RECORD=""!(RECORD1="") S Y=-1 Q ;-1 no record
  1. S USERNUM=+$P(RECORD1,"^")
  1. I $P(RECORD1,"^",2)=""!(USERNUM=0) S Y=-4 Q ;-4 cannot recode record
  1. S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
  1. S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
  1. S $P(RECORD1,"^",2)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
  1. S $P(RECORD,"^",9,10)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
  1. S ^PRC(442,LEVEL0,6,LEVEL1,0)=RECORD
  1. S ^PRC(442,LEVEL0,6,LEVEL1,1)=RECORD1
  1. S Y=1 ;1 record recoded properly
  1. Q
  1. REMOVE(LEVEL0,LEVEL1) ;Entry point to remove e signature from record
  1. NEW I,RECORD,RECORD1
  1. S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
  1. S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
  1. F I=10 S $P(RECORD,"^",I)=""
  1. F I=1,2,3 S $P(RECORD1,"^",I)=""
  1. S ^PRC(442,LEVEL0,6,LEVEL1,0)=RECORD
  1. S ^PRC(442,LEVEL0,6,LEVEL1,1)=RECORD1
  1. Q
  1. VERIFY(LEVEL0,LEVEL1) ;extrinsic function to verify version 1 signature. Returns 1 if valid
  1. NEW RECORD,RECORD1,VERSION,SIGBLOCK
  1. S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
  1. S VERSION=$P(RECORD,"^",9),SIGBLOCK=$P(RECORD,"^",10)
  1. I VERSION_SIGBLOCK="" Q 1
  1. Q ($$SUM^PRCUESIG($$DECODE(LEVEL0,LEVEL1))=SIGBLOCK)
  1. STRING(X,X1) ;Build String of critical fields
  1. Q $P(X,"^",1,4)_"^"_$P(X1,"^",3)