| 1 | PRCFAES1 ;WISC/LEM-ESIG MAINTENANCE ROUTINE ;5/20/93 9:27 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 5.5 (ELECTRONIC SIGNATURE) FILE 421.2
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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,RECORD05,VERSION,PERSON,SIG,CHECKSUM
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| 8 | ;get record and check version
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| 9 | S RECORD=$G(^PRCF(421.2,LEVEL0,0)) I RECORD="" QUIT ""
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| 10 | S RECORD05=$G(^PRCF(421.2,LEVEL0,.5))
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| 11 | S VERSION=$P(RECORD05,"^",1)
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| 12 | S PERSON=+$P(RECORD,"^",5)
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| 13 | I VERSION'="",VERSION'=1 Q ""
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| 14 | S SIG=$P(RECORD,"^",6)
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| 15 | D1 ;decode e signature for version 1
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| 16 | S RECORD=$G(^PRCF(421.2,LEVEL0,0))
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| 17 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD))
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| 18 | QUIT $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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| 19 | ENCODE(LEVEL0,USERNUM,Y) ;Encode e signature for version 1 only
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| 20 | ;Parameter passing entry point
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| 21 | NEW RECORD,RECORD05,SIGBLOCK,CHECKSUM,OLDUSER
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| 22 | ;get record
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| 23 | S USERNUM=+USERNUM
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| 24 | S RECORD=$G(^PRCF(421.2,LEVEL0,0))
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| 25 | S RECORD05=$G(^PRCF(421.2,LEVEL0,.5))
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| 26 | I RECORD="" S Y=-1 QUIT ;-1 no transaction record
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| 27 | S OLDUSER=+$P(RECORD,"^",5)
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| 28 | I OLDUSER>0,+$P(RECORD05,"^",1)<1,$P(RECORD,"^",6)'="" S Y=-4 QUIT ;-4 cannot re-sign record with version <1
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| 29 | I OLDUSER>0 S USERNUM=OLDUSER
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| 30 | I USERNUM=0 S Y=-3 QUIT ;-3 no usernumber for filing
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| 31 | S SIGBLOCK=$P(RECORD05,"^",2)
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| 32 | I SIGBLOCK="" S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 33 | I SIGBLOCK="" S Y=-2 QUIT ;-2 = no signature block in file 200
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| 34 | I OLDUSER=0 S $P(RECORD,"^",5)=USERNUM
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| 35 | S:$P(RECORD,"^",10)="" $P(RECORD,"^",10)=$$NOW^PRCUESIG
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| 36 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD))
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| 37 | S $P(RECORD,"^",6)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 38 | S $P(RECORD05,"^",1,2)="1^"_SIGBLOCK
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| 39 | S ^PRCF(421.2,LEVEL0,0)=RECORD
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| 40 | S ^PRCF(421.2,LEVEL0,.5)=RECORD05
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| 41 | S Y=1 QUIT
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| 42 | REMOVE(LEVEL0) ;Entry point to remove e signature from record
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| 43 | ;NOT an extrinsic function
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| 44 | NEW RECORD,RECORD05
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| 45 | S RECORD=$G(^PRCF(421.2,LEVEL0,0))
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| 46 | S RECORD05=$G(^PRCF(421.2,LEVEL0,.5))
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| 47 | S $P(RECORD,"^",5,6)="^"
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| 48 | S $P(RECORD,"^",10)=""
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| 49 | S $P(RECORD05,"^",2)=""
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| 50 | S ^PRCF(421.2,LEVEL0,0)=RECORD
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| 51 | S ^PRCF(421.2,LEVEL0,.5)=RECORD05
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| 52 | QUIT
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| 53 | VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
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| 54 | NEW RECORD05,VERSION,SIGBLOCK
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| 55 | ;get record variables
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| 56 | S RECORD05=$G(^PRCF(421.2,LEVEL0,.5))
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| 57 | S VERSION=$P(RECORD05,"^",1),SIGBLOCK=$P(RECORD05,"^",2)
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| 58 | I VERSION_SIGBLOCK="" QUIT 1
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| 59 | QUIT ($$DECODE(LEVEL0,TRANS)=SIGBLOCK)
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| 60 | STRING(X) ;Build String of critical fields
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| 61 | NEW RECORD
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| 62 | Q $P(X,"^",1)_"^"_$P(X,"^",10)
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