| 1 | PRCHES3 ;WISC/RHD/AKS-ESIG MAINTENANCE ROUTINE ;3/18/93 12:49
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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 19.4 (LCS ELEC. SIG)
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| 5 | ; FIELD .6 (PARTIAL), FILE 442
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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=$G(^PRC(442,LEVEL0,11,LEVEL1,0)) I RECORD="" Q ""
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| 10 | S RECORD1=$G(^PRC(442,LEVEL0,11,LEVEL1,1))
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| 11 | S VERSION=$P(RECORD1,"^",13)
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| 12 | S PERSON=+$P(RECORD1,"^",3)
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| 13 | I VERSION'="",VERSION'=1 Q ""
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| 14 | S SIG=$P(RECORD1,"^",4)
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| 15 | D1 ;decode e signature for version 1
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| 16 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
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| 17 | Q $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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| 18 | ENCODE(LEVEL0,LEVEL1,USERNUM,Y) ;Encode e signature for version 1 only
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| 19 | NEW RECORD,RECORD1,SIGBLOCK,CHECKSUM,OLDUSER
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| 20 | S USERNUM=+USERNUM
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| 21 | I USERNUM=0 S Y=-3 Q ;-3 no user number available for filing
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| 22 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 23 | I SIGBLOCK="" S Y=-2 Q ;-2 no signature block
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| 24 | S RECORD=$G(^PRC(442,LEVEL0,11,LEVEL1,0))
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| 25 | S RECORD1=$G(^PRC(442,LEVEL0,11,LEVEL1,1))
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| 26 | I RECORD="" S Y=-1 Q ;-1 no 2237 record
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| 27 | I $P(RECORD1,"^",4)'="" S Y=-4 Q ;-4 cannot re-sign record
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| 28 | S OLDUSER=+$P(RECORD1,"^",3)
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| 29 | I OLDUSER=0 S $P(RECORD1,"^",3)=USERNUM
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| 30 | I OLDUSER>0 S USERNUM=OLDUSER
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| 31 | S:$P(RECORD1,"^",5)="" $P(RECORD1,"^",5)=$$NOW^PRCUESIG
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| 32 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
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| 33 | S $P(RECORD1,"^",4)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 34 | S $P(RECORD1,"^",13,14)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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| 35 | S ^PRC(442,LEVEL0,11,LEVEL1,1)=RECORD1
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| 36 | S Y=1 Q
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| 37 | REMOVE(LEVEL0,LEVEL1) ;Entry point to remove esig
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| 38 | NEW I,RECORD1
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| 39 | S RECORD1=$G(^PRC(442,LEVEL0,11,LEVEL1,1)) Q:RECORD1=""
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| 40 | F I=3,4,5,14 S $P(RECORD1,"^",I)=""
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| 41 | S ^PRC(442,LEVEL0,11,LEVEL1,1)=RECORD1
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| 42 | Q
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| 43 | VERIFY(LEVEL0,LEVEL1) ;extrinsic function to verify version 1 esig Returns 1 if valid
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| 44 | NEW RECORD,RECORD1,VERSION,SIGBLOCK
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| 45 | S RECORD=$G(^PRC(442,LEVEL0,11,LEVEL1,0))
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| 46 | S RECORD1=$G(^PRC(442,LEVEL0,11,LEVEL1,1))
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| 47 | S VERSION=$P(RECORD1,"^",13),SIGBLOCK=$P(RECORD1,"^",14)
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| 48 | I VERSION_SIGBLOCK="" Q 1
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| 49 | Q ($$SUM^PRCUESIG($$DECODE(LEVEL0,LEVEL1))=SIGBLOCK)
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| 50 | STRING(X,X1) ;Build String of critical fields
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| 51 | Q $P(X,"^")_"^"_$P(X1,"^",5)
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