| 1 | PRCSC3 ;WISC/LEM-ESIG MAINTENANCE ROUTINE ; 08/02/93 8:12 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 44.8 (GPF ELECTRONIC SIGNATURE), FILE 410
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| 5 | DECODE(LEVEL0) ;Extrinsic Function to return hashed electronic sig to readable form.
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| 6 | ;returns "" if unsuccessful
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| 7 | NEW RECORD7,RECORD71,VERSION,PERSON,SIG,CHECKSUM
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| 8 | ;get record and check version
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| 9 | S RECORD7=$G(^PRCS(410,LEVEL0,7)) I RECORD7="" QUIT ""
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| 10 | S RECORD71=$G(^PRCS(410,LEVEL0,7.1))
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| 11 | S VERSION=$P(RECORD71,"^",1)
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| 12 | S PERSON=+$P(RECORD7,"^",8)
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| 13 | I VERSION'="",VERSION'=1 Q ""
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| 14 | S SIG=$P(RECORD7,"^",9)
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| 15 | D1 ;decode e signature for version 1
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| 16 | S RECORD=$G(^PRCS(410,LEVEL0,0))
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| 17 | S RECORD1=$G(^PRCS(410,LEVEL0,1))
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| 18 | S RECORD3=$G(^PRCS(410,LEVEL0,3))
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| 19 | S RECORD4=$G(^PRCS(410,LEVEL0,4))
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| 20 | S RECORD10=$G(^PRCS(410,LEVEL0,10))
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| 21 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD1,RECORD3,RECORD4,RECORD7,RECORD10))
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| 22 | QUIT $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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| 23 | ENCODE(LEVEL0,USERNUM,Y) ;Encode e signature for version 1 only
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| 24 | ;Parameter passing entry point
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| 25 | NEW SIGBLOCK,CHECKSUM,OLDUSER
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| 26 | NEW RECORD,RECORD1,RECORD3,RECORD4,RECORD7,RECORD71,RECORD10
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| 27 | ;get record
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| 28 | S USERNUM=+USERNUM
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| 29 | I USERNUM=0 S Y=-3 QUIT ;-3 no user num available
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| 30 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 31 | I SIGBLOCK="" S Y=-2 QUIT ;-2 no sigblock in file 200
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| 32 | S RECORD=$G(^PRCS(410,LEVEL0,0))
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| 33 | S RECORD1=$G(^PRCS(410,LEVEL0,1))
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| 34 | S RECORD3=$G(^PRCS(410,LEVEL0,3))
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| 35 | S RECORD4=$G(^PRCS(410,LEVEL0,4))
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| 36 | S RECORD7=$G(^PRCS(410,LEVEL0,7))
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| 37 | S RECORD71=$G(^PRCS(410,LEVEL0,7.1))
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| 38 | S RECORD10=$G(^PRCS(410,LEVEL0,10))
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| 39 | I RECORD="" S Y=-1 QUIT ;-1 no transaction record
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| 40 | I $P(RECORD7,"^",9)'="" S Y=-4 QUIT ;-4 cannot re-sign record
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| 41 | S OLDUSER=+$P(RECORD7,"^",8)
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| 42 | I OLDUSER=0 S $P(RECORD7,"^",8)=USERNUM
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| 43 | I OLDUSER>0 S USERNUM=OLDUSER
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| 44 | S:$P(RECORD7,"^",10)="" $P(RECORD7,"^",10)=$$NOW^PRCUESIG
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| 45 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD1,RECORD3,RECORD4,RECORD7,RECORD10))
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| 46 | S $P(RECORD7,"^",9)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 47 | S $P(RECORD71,"^",1,2)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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| 48 | S ^PRCS(410,LEVEL0,7)=RECORD7
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| 49 | S ^PRCS(410,LEVEL0,7.1)=RECORD71
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| 50 | S Y=1 QUIT
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| 51 | REMOVE(LEVEL0) ;Entry point to remove e signature from record
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| 52 | ;NOT an extrinsic function
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| 53 | NEW RECORD7,RECORD71
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| 54 | S RECORD7=$G(^PRCS(410,LEVEL0,7))
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| 55 | S RECORD71=$G(^PRCS(410,LEVEL0,7.1))
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| 56 | S $P(RECORD7,"^",8,10)="^^"
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| 57 | S $P(RECORD71,"^",2)=""
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| 58 | S ^PRCS(410,LEVEL0,7)=RECORD7
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| 59 | S ^PRCS(410,LEVEL0,7.1)=RECORD71
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| 60 | QUIT
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| 61 | VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
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| 62 | NEW RECORD71,VERSION,SIGBLOCK
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| 63 | ;get record variables
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| 64 | S RECORD71=$G(^PRCS(410,LEVEL0,7.1))
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| 65 | S VERSION=$P(RECORD71,"^",1),SIGBLOCK=$P(RECORD71,"^",2)
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| 66 | I VERSION_SIGBLOCK="" QUIT 1
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| 67 | QUIT ($$SUM^PRCUESIG($$DECODE(LEVEL0))=SIGBLOCK)
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| 68 | STRING(X,X1,X3,X4,X7,X10) ;Build String of critical fields
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| 69 | NEW RECORD,RECORD7,RECORD71,SIGBLOCK,CHECKSUM,OLDUSER
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| 70 | Q $P(X,"^",1)_"^"_$P(X1,"^",1)_"^"_$P(X3,"^",1)_"^"_$P(X4,"^",1)_"^"_$P(X7,"^",10)_"^"_$P(X10,"^",1)
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