| 1 | PRCHES4 ;WISC/RHD/AKS-ESIG MAINTENANCE ROUTINE ;3/18/93 15:29
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| 2 | V ;;5.1;IFCAP;;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 4 (ELECTRONIC SIGNATURE)
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| 5 | ; FIELD 2.4 (OBLIGATION DATA), FILE 442
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| 6 | DECODE(LEVEL0,LEVEL1) ;return esig in readable form.
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| 7 | ;returns "" if unsuccessful
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| 8 | NEW RECORD,VERSION,PERSON,SIG,CHECKSUM
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| 9 | S RECORD=$G(^PRC(442,LEVEL0,10,LEVEL1,0)) I RECORD="" Q ""
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| 10 | S VERSION=$P(RECORD,"^",7)
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| 11 | S PERSON=+$P(RECORD,"^",2)
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| 12 | I VERSION'="",VERSION'=1 Q ""
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| 13 | S SIG=$P(RECORD,"^",5)
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| 14 | D1 ;decode esig for version 1
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| 15 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD))
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| 16 | Q $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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| 17 | ENCODE(LEVEL0,LEVEL1,USERNUM,Y) ;Encode esig for version 1 only
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| 18 | NEW RECORD,SIGBLOCK,CHECKSUM,OLDUSER
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| 19 | S USERNUM=+USERNUM
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| 20 | I USERNUM=0 S Y=-3 Q ;-3 no user number
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| 21 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 22 | I SIGBLOCK="" S Y=-2 Q ;-2 no signature block in file 200
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| 23 | S RECORD=$G(^PRC(442,LEVEL0,10,LEVEL1,0))
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| 24 | I RECORD="" S Y=-1 Q ;-1 no 2237 record
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| 25 | I $P(RECORD,"^",5)'="" S Y=-4 Q ;-4 cannot re-sign record
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| 26 | S OLDUSER=+$P(RECORD,"^",2)
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| 27 | I OLDUSER=0 S $P(RECORD,"^",2)=USERNUM
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| 28 | I OLDUSER>0 S USERNUM=OLDUSER
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| 29 | S:$P(RECORD,"^",6)="" $P(RECORD,"^",6)=$$NOW^PRCUESIG
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| 30 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD))
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| 31 | S $P(RECORD,"^",5)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 32 | S $P(RECORD,"^",7,8)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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| 33 | S ^PRC(442,LEVEL0,10,LEVEL1,0)=RECORD
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| 34 | S Y=1 Q
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| 35 | REMOVE(LEVEL0,LEVEL1) ;NOT an extrinsic function
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| 36 | NEW I,RECORD
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| 37 | S RECORD=$G(^PRC(442,LEVEL0,10,LEVEL1,0)) Q:RECORD=""
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| 38 | F I=2,5,6,8 S $P(RECORD,"^",I)=""
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| 39 | S ^PRC(442,LEVEL0,10,LEVEL1,0)=RECORD
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| 40 | Q
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| 41 | VERIFY(LEVEL0,LEVEL1) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
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| 42 | NEW RECORD,VERSION,SIGBLOCK
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| 43 | ;get record variables
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| 44 | S RECORD=$G(^PRC(442,LEVEL0,10,LEVEL1,0))
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| 45 | S VERSION=$P(RECORD,"^",7),SIGBLOCK=$P(RECORD,"^",8)
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| 46 | I VERSION_SIGBLOCK="" Q 1
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| 47 | Q ($$SUM^PRCUESIG($$DECODE(LEVEL0,LEVEL1))=SIGBLOCK)
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| 48 | STRING(X) ;Build String of critical fields
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| 49 | Q $P(X,"^")_"^"_$P(X,"^",3)_"^"_$P(X,"^",4)_"^"_$P(X,"^",6)
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