| 1 | PRCHES14 ;WISC/RHD/AKS-ESIG MAINT ;AUG 2, 2001
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| 2 | V ;;5.1;IFCAP;**38**;Oct 20, 2000
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| 3 | ;Per VHA Directive 10-93-142, this routine should not be modified.
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| 4 | ;ROUTINE FOR MAINTAINING SUBFIELD 11 (ELECTRONIC SIGNATURE)
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| 5 | ; FIELD 50 (AMENDMENT) FILE 443.6
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| 6 | DECODE(LEVEL0,LEVEL1) ;return esig to readable form
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| 7 | ;returns "" if unsuccessful
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| 8 | NEW RECORD,RECORD1,VERSION,PERSON,SIG,CHECKSUM
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| 9 | S RECORD=$G(^PRC(443.6,LEVEL0,6,LEVEL1,0)) I RECORD="" Q ""
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| 10 | S RECORD1=$G(^PRC(443.6,LEVEL0,6,LEVEL1,1))
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| 11 | S VERSION=$P(RECORD,"^",11)
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| 12 | S PERSON=+$P(RECORD1,"^",5)
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| 13 | I VERSION'="",VERSION'=1 Q ""
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| 14 | S SIG=$P(RECORD1,"^",6)
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| 15 | D1 ;esig for ver 1
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| 16 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
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| 17 | Q $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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| 18 | ENCODE(LEVEL0,LEVEL1,USERNUM,Y) ;Encode esig for version 1 only
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| 19 | NEW RECORD,RECORD1,SIGBLOCK,CHECKSUM,OLDUSER
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| 20 | S USERNUM=+USERNUM
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| 21 | I USERNUM=0 S Y=-3 Q ;-3 no user number
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| 22 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 23 | I SIGBLOCK="" S Y=-2 Q ;-2 no signature block
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| 24 | S RECORD=$G(^PRC(443.6,LEVEL0,6,LEVEL1,0))
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| 25 | S RECORD1=$G(^PRC(443.6,LEVEL0,6,LEVEL1,1))
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| 26 | I RECORD="" S Y=-1 Q ;-1 no record
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| 27 | I $P(RECORD1,"^",6)'="" S Y=-4 Q ;-4 cannot re-sign record
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| 28 | S OLDUSER=+$P(RECORD1,"^",5)
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| 29 | I OLDUSER=0 S $P(RECORD1,"^",5)=USERNUM
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| 30 | I OLDUSER>0 S USERNUM=OLDUSER
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| 31 | S:$P(RECORD1,"^",8)="" $P(RECORD1,"^",8)=$$NOW^PRCUESIG
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| 32 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
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| 33 | S $P(RECORD1,"^",6)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 34 | S $P(RECORD,"^",11)="1",$P(RECORD1,"^",7)=$$SUM^PRCUESIG(SIGBLOCK)
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| 35 | S ^PRC(443.6,LEVEL0,6,LEVEL1,0)=RECORD
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| 36 | S ^PRC(443.6,LEVEL0,6,LEVEL1,1)=RECORD1
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| 37 | S Y=1 Q
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| 38 | ;
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| 39 | RECODE(LEVEL0,CHECKSUM,Y) ;Recode esig for version 1 only
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| 40 | NEW RECORD,RECORD1,RECORD12,SIGBLOCK,USERNUM
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| 41 | S RECORD=$G(^PRC(443.6,LEVEL0,0))
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| 42 | S RECORD1=$G(^PRC(443.6,LEVEL0,1))
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| 43 | S RECORD12=$G(^PRC(443.6,LEVEL0,12))
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| 44 | I RECORD="" S Y=-1 Q ;-1 no record
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| 45 | ;S USERNUM=+$P(RECORD1,"^",10)
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| 46 | S USERNUM=DUZ
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| 47 | I USERNUM=0!'CHECKSUM S Y=-4 Q ;-4 cannot recode record
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| 48 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 49 | S $P(RECORD12,"^",2)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 50 | S $P(RECORD12,"^",11,12)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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| 51 | S ^PRC(443.6,LEVEL0,12)=RECORD12
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| 52 | S Y=1 Q
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| 53 | REMOVE(LEVEL0,LEVEL1) ;Entry point to remove esig from record
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| 54 | NEW RECORD
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| 55 | S RECORD=$G(^PRC(443.6,LEVEL0,6,LEVEL1,0)) Q:RECORD=""
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| 56 | S $P(^PRC(443.6,LEVEL0,6,LEVEL1,1),"^",5,8)="^^^"
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| 57 | Q
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| 58 | VERIFY(LEVEL0,LEVEL1) ;verify version 1 signature. Returns 1 if valid
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| 59 | NEW RECORD,RECORD1,VERSION,SIGBLOCK
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| 60 | S RECORD=$G(^PRC(443.6,LEVEL0,6,LEVEL1,0))
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| 61 | S RECORD1=$G(^PRC(443.6,LEVEL0,6,LEVEL1,1))
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| 62 | S VERSION=$P(RECORD,"^",11),SIGBLOCK=$P(RECORD1,"^",7)
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| 63 | I VERSION_SIGBLOCK="" Q 1
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| 64 | Q ($$SUM^PRCUESIG($$DECODE(LEVEL0,LEVEL1))=SIGBLOCK)
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| 65 | STRING(X,X1) ;Build String of critical fields
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| 66 | Q $P(X,"^")_"^"_$P(X,"^",2)_"^"_$P(X,"^",3)_"^"_$P(X1,"^",4)_"^"_$P(X1,"^",8)
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