| 1 | PRCBES1 ;WISC@ALTOONA/CTB-ESIG MAINTENANCE ROUTINE ;1/15/95 12:28
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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 12.5 (ELECTRONIC SIGNATURE), FILE 421
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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 RECORD,RECORD4,VERSION,PERSON,SIG,CHECKSUM
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| 8 | ;get record and check version
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| 9 | S RECORD=$G(^PRCF(421,LEVEL0,0)) I RECORD="" QUIT ""
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| 10 | S RECORD4=$G(^PRCF(421,LEVEL0,4))
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| 11 | S VERSION=$P(RECORD4,"^",11)
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| 12 | S PERSON=+$P(RECORD,"^",11)
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| 13 | I VERSION'="",VERSION'=1 Q ""
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| 14 | S SIG=$P(RECORD,"^",17)
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| 15 | I VERSION=1 G D1
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| 16 | D ;decode e signature less than version 1
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| 17 | S X=$$DECODE^PRCUESIG(SIG,LEVEL0,PERSON)
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| 18 | QUIT X
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| 19 | D1 ;decode e signature for version 1
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| 20 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD4))
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| 21 | QUIT $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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| 22 | ENCODE(LEVEL0,USERNUM,Y) ;Encode e signature for version 1 only
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| 23 | ;Parameter passing entry point
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| 24 | NEW RECORD,RECORD4,SIGBLOCK,CHECKSUM,OLDUSER
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| 25 | ;get record
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| 26 | S USERNUM=+USERNUM
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| 27 | I USERNUM=0 S Y=-3 QUIT ;-3 no user num available
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| 28 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 29 | I SIGBLOCK="" S Y=-2 QUIT ;-2 no sigblock in file 200
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| 30 | S RECORD=$G(^PRCF(421,LEVEL0,0))
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| 31 | S RECORD4=$G(^PRCF(421,LEVEL0,4))
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| 32 | I RECORD="" S Y=-1 QUIT ;-1 no 2237 record
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| 33 | I $P(RECORD,"^",17)'="" S Y=-4 QUIT ;-4 cannot re-sign record
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| 34 | S OLDUSER=+$P(RECORD,"^",11)
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| 35 | I OLDUSER=0 S $P(RECORD,"^",11)=USERNUM
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| 36 | I OLDUSER>0 S USERNUM=OLDUSER
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| 37 | S:$P(RECORD4,"^",13)="" $P(RECORD4,"^",13)=$$NOW^PRCUESIG
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| 38 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD4))
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| 39 | S $P(RECORD,"^",17)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 40 | S $P(RECORD4,"^",11,12)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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| 41 | S ^PRCF(421,LEVEL0,0)=RECORD
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| 42 | S ^PRCF(421,LEVEL0,4)=RECORD4
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| 43 | S Y=1 QUIT
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| 44 | REMOVE(LEVEL0) ;Entry point to remove e signature from record
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| 45 | ;NOT an extrinsic function
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| 46 | NEW I,RECORD,RECORD4
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| 47 | S RECORD4=$G(^PRCF(421,LEVEL0,4))
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| 48 | S RECORD=$G(^PRCF(421,LEVEL0,0))
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| 49 | F I=11,17 S $P(RECORD,"^",I)=""
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| 50 | S $P(RECORD4,"^",12,13)="^"
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| 51 | S ^PRCF(421,LEVEL0,1)=RECORD1
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| 52 | S ^PRCF(421,LEVEL0,4)=RECORD4
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| 53 | QUIT
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| 54 | VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
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| 55 | NEW RECORD,RECORD4,VERSION,SIGBLOCK
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| 56 | ;get record variables
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| 57 | S RECORD=$G(^PRCF(421,LEVEL0,0))
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| 58 | S RECORD4=$G(^PRCF(421,LEVEL0,4))
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| 59 | S VERSION=$P(RECORD4,"^",11),SIGBLOCK=$P(RECORD4,"^",12)
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| 60 | I VERSION_SIGBLOCK="" QUIT 1
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| 61 | QUIT ($$SUM^PRCUESIG($$DECODE(LEVEL0))=SIGBLOCK)
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| 62 | STRING(X,X4) ;Build String of critical fields
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| 63 | Q $P(X,"^",1,2)_"^"_$P(X,"^",4,10)_$P(X,"^",18)_"^"_$P(X4,"^",13)
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