65 lines
2.7 KiB
Mathematica
65 lines
2.7 KiB
Mathematica
PRCFDES1 ;WISC/LEM-ESIG MAINTENANCE ROUTINE ;1/19/93 1:05 PM
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V ;;5.1;IFCAP;;Oct 20, 2000
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;Per VHA Directive 10-93-142, this routine should not be modified.
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;ROUTINE FOR MAINTAINING FIELD 61 (CERTIFIED BY ELEC SIG), FILE 421.5
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DECODE(LEVEL0) ;Extrinsic Function to return hashed electronic sig to readable form.
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;returns "" if unsuccessful
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NEW RECORD2,RECORD21,VERSION,PERSON,SIG,CHECKSUM
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;get record and check version
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S RECORD2=$G(^PRCF(421.5,LEVEL0,2)) I RECORD2="" QUIT ""
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S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
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S VERSION=$P(RECORD21,"^",1)
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S PERSON=+$P(RECORD2,"^",10)
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I VERSION'="",VERSION'=1 Q ""
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S SIG=$P(RECORD2,"^",12)
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D1 ;decode e signature for version 1
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S RECORD=$G(^PRCF(421.5,LEVEL0,0))
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S RECORD1=$G(^PRCF(421.5,LEVEL0,1))
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S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD1))
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QUIT $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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ENCODE(LEVEL0,USERNUM,Y) ;Encode e signature for version 1 only
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;Parameter passing entry point
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NEW SIGBLOCK,CHECKSUM,OLDUSER
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NEW RECORD,RECORD1,RECORD2,RECORD21
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;get record
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S USERNUM=+USERNUM
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I USERNUM=0 S Y=-3 QUIT ;-3 no user num available
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S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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I SIGBLOCK="" S Y=-2 QUIT ;-2 no sigblock in file 200
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S RECORD=$G(^PRCF(421.5,LEVEL0,0))
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S RECORD1=$G(^PRCF(421.5,LEVEL0,1))
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S RECORD2=$G(^PRCF(421.5,LEVEL0,2))
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S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
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I RECORD="" S Y=-1 QUIT ;-1 no transaction record
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I $P(RECORD2,"^",12)'="" S Y=-4 QUIT ;-4 cannot re-sign record
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S OLDUSER=+$P(RECORD2,"^",10)
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I OLDUSER=0 S $P(RECORD2,"^",10)=USERNUM
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I OLDUSER>0 S USERNUM=OLDUSER
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S:$P(RECORD21,"^",5)="" $P(RECORD21,"^",5)=$$NOW^PRCUESIG
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S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD1))
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S $P(RECORD2,"^",12)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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S $P(RECORD21,"^",1,2)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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S ^PRCF(421.5,LEVEL0,2)=RECORD2
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S ^PRCF(421.5,LEVEL0,2.1)=RECORD21
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S Y=1 QUIT
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REMOVE(LEVEL0) ;Entry point to remove e signature from record
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;NOT an extrinsic function
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NEW RECORD2,RECORD21,I
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S RECORD2=$G(^PRCF(421.5,LEVEL0,2))
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S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
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F I=10,12 S $P(RECORD2,"^",I)=""
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F I=2,5 S $P(RECORD21,"^",I)=""
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S ^PRCF(421.5,LEVEL0,2)=RECORD2
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S ^PRCF(421.5,LEVEL0,2.1)=RECORD21
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QUIT
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VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
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NEW RECORD21,VERSION,SIGBLOCK
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;get record variables
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S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
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S VERSION=$P(RECORD21,"^",1),SIGBLOCK=$P(RECORD21,"^",2)
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I VERSION_SIGBLOCK="" QUIT 1
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QUIT ($$SUM^PRCUESIG($$DECODE(LEVEL0))=SIGBLOCK)
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STRING(X,X1) ;Build String of critical fields
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NEW RECORD,RECORD1
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Q $P(X,"^",1)_"^"_$P(X,"^",3)_"^"_$P(X,"^",4)_"^"_$P(X,"^",8)_"^"_$P(X,"^",15)_"^"_$P(X1,"^",3)
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