| 1 | PRCFDES1 ;WISC/LEM-ESIG MAINTENANCE ROUTINE ;1/19/93 1:05 PM
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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 61 (CERTIFIED BY ELEC SIG), FILE 421.5
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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 RECORD2,RECORD21,VERSION,PERSON,SIG,CHECKSUM
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| 8 | ;get record and check version
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| 9 | S RECORD2=$G(^PRCF(421.5,LEVEL0,2)) I RECORD2="" QUIT ""
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| 10 | S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
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| 11 | S VERSION=$P(RECORD21,"^",1)
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| 12 | S PERSON=+$P(RECORD2,"^",10)
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| 13 | I VERSION'="",VERSION'=1 Q ""
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| 14 | S SIG=$P(RECORD2,"^",12)
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| 15 | D1 ;decode e signature for version 1
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| 16 | S RECORD=$G(^PRCF(421.5,LEVEL0,0))
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| 17 | S RECORD1=$G(^PRCF(421.5,LEVEL0,1))
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| 18 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD1))
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| 19 | QUIT $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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| 20 | ENCODE(LEVEL0,USERNUM,Y) ;Encode e signature for version 1 only
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| 21 | ;Parameter passing entry point
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| 22 | NEW SIGBLOCK,CHECKSUM,OLDUSER
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| 23 | NEW RECORD,RECORD1,RECORD2,RECORD21
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| 24 | ;get record
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| 25 | S USERNUM=+USERNUM
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| 26 | I USERNUM=0 S Y=-3 QUIT ;-3 no user num available
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| 27 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 28 | I SIGBLOCK="" S Y=-2 QUIT ;-2 no sigblock in file 200
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| 29 | S RECORD=$G(^PRCF(421.5,LEVEL0,0))
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| 30 | S RECORD1=$G(^PRCF(421.5,LEVEL0,1))
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| 31 | S RECORD2=$G(^PRCF(421.5,LEVEL0,2))
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| 32 | S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
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| 33 | I RECORD="" S Y=-1 QUIT ;-1 no transaction record
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| 34 | I $P(RECORD2,"^",12)'="" S Y=-4 QUIT ;-4 cannot re-sign record
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| 35 | S OLDUSER=+$P(RECORD2,"^",10)
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| 36 | I OLDUSER=0 S $P(RECORD2,"^",10)=USERNUM
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| 37 | I OLDUSER>0 S USERNUM=OLDUSER
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| 38 | S:$P(RECORD21,"^",5)="" $P(RECORD21,"^",5)=$$NOW^PRCUESIG
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| 39 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD1))
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| 40 | S $P(RECORD2,"^",12)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 41 | S $P(RECORD21,"^",1,2)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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| 42 | S ^PRCF(421.5,LEVEL0,2)=RECORD2
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| 43 | S ^PRCF(421.5,LEVEL0,2.1)=RECORD21
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| 44 | S Y=1 QUIT
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| 45 | REMOVE(LEVEL0) ;Entry point to remove e signature from record
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| 46 | ;NOT an extrinsic function
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| 47 | NEW RECORD2,RECORD21,I
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| 48 | S RECORD2=$G(^PRCF(421.5,LEVEL0,2))
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| 49 | S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
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| 50 | F I=10,12 S $P(RECORD2,"^",I)=""
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| 51 | F I=2,5 S $P(RECORD21,"^",I)=""
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| 52 | S ^PRCF(421.5,LEVEL0,2)=RECORD2
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| 53 | S ^PRCF(421.5,LEVEL0,2.1)=RECORD21
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| 54 | QUIT
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| 55 | VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
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| 56 | NEW RECORD21,VERSION,SIGBLOCK
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| 57 | ;get record variables
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| 58 | S RECORD21=$G(^PRCF(421.5,LEVEL0,2.1))
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| 59 | S VERSION=$P(RECORD21,"^",1),SIGBLOCK=$P(RECORD21,"^",2)
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| 60 | I VERSION_SIGBLOCK="" QUIT 1
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| 61 | QUIT ($$SUM^PRCUESIG($$DECODE(LEVEL0))=SIGBLOCK)
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| 62 | STRING(X,X1) ;Build String of critical fields
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| 63 | NEW RECORD,RECORD1
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| 64 | Q $P(X,"^",1)_"^"_$P(X,"^",3)_"^"_$P(X,"^",4)_"^"_$P(X,"^",8)_"^"_$P(X,"^",15)_"^"_$P(X1,"^",3)
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