| 1 | PRCHES11 ;WISC/RHD/AKS-ESIG MAINTENANCE ROUTINE ; 1/4/93 11:04 AM
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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 FIELD 3 (ELECTRONIC SIGNATURE), FILE 443
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| 5 | DECODE(LEVEL0) ;Extrinsic Function to return hashed esig to readable form.
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| 6 | ;returns "" if unsuccessful
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| 7 | NEW RECORD,RECORD1,RECORD12,VERSION,PERSON,SIG,CHECKSUM
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| 8 | S RECORD=$G(^PRC(443,LEVEL0,0)) I RECORD="" Q ""
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| 9 | S VERSION=$P(RECORD,"^",14)
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| 10 | S PERSON=+$P(RECORD,"^",2)
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| 11 | I VERSION'="",VERSION'=1 Q ""
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| 12 | S SIG=$P(RECORD,"^",3)
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| 13 | D1 ;decode e signature for version 1
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| 14 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD))
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| 15 | Q $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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| 16 | ENCODE(LEVEL0,USERNUM,Y) ;Encode esig for version 1 only
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| 17 | NEW RECORD,SIGBLOCK,CHECKSUM,OLDUSER
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| 18 | S USERNUM=+USERNUM
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| 19 | I USERNUM=0 S Y=-3 Q ;-3 no user number
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| 20 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 21 | I SIGBLOCK="" S Y=-2 Q ;-2 no signature block
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| 22 | S RECORD=$G(^PRC(443,LEVEL0,0))
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| 23 | I RECORD="" S Y=-1 Q ;-1 no record
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| 24 | I $P(RECORD,"^",3)'="" S Y=-4 Q ;-4 cannot re-sign record
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| 25 | S OLDUSER=+$P(RECORD,"^",2)
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| 26 | I OLDUSER=0 S $P(RECORD,"^",2)=USERNUM
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| 27 | I OLDUSER>0 S USERNUM=OLDUSER
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| 28 | S:$P(RECORD,"^",4)="" $P(RECORD,"^",4)=$$NOW^PRCUESIG
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| 29 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD))
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| 30 | S $P(RECORD,"^",3)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 31 | S $P(RECORD,"^",14)=1,$P(RECORD,"^",13)=$$SUM^PRCUESIG(SIGBLOCK)
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| 32 | S ^PRC(443,LEVEL0,0)=RECORD
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| 33 | S Y=1 Q
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| 34 | REMOVE(LEVEL0) ;Entry point to remove esig
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| 35 | NEW I,RECORD
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| 36 | S RECORD=$G(^PRC(443,LEVEL0,0))
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| 37 | F I=2,3,4,13 S $P(RECORD,"^",I)=""
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| 38 | S ^PRC(443,LEVEL0,0)=RECORD
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| 39 | Q
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| 40 | VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
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| 41 | NEW RECORD,VERSION,SIGBLOCK
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| 42 | S RECORD=$G(^PRC(443,LEVEL0,0))
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| 43 | S VERSION=$P(RECORD,"^",14),SIGBLOCK=$P(RECORD,"^",13)
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| 44 | I VERSION_SIGBLOCK="" Q 1
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| 45 | Q ($$SUM^PRCUESIG($$DECODE(LEVEL0))=SIGBLOCK)
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| 46 | STRING(X) ;Build String of critical fields
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| 47 | Q $P(X,"^")_"^"_$P(X,"^",4)_"^"_$P(X,"^",9)
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