| 1 | PRCHES6 ;WISC/RHD/AKS-ESIG MAINTENANCE ROUTINE ;8/18/94 3:30 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 SUBFIELD 7 (ELECTRONIC SIGNATURE)
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| 5 | ; FIELD 50 (AMMENDMENT) FILE 442
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| 6 | DECODE(LEVEL0,LEVEL1) ;Extrinsic Function to return hashed electronic sig to readable form.
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| 7 | ;returns "" if unsuccessful
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| 8 | NEW RECORD,RECORD1,VERSION,PERSON,SIG,CHECKSUM
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| 9 | S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0)) I RECORD="" Q ""
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| 10 | S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
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| 11 | S VERSION=$P(RECORD,"^",9)
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| 12 | S PERSON=+$P(RECORD1,"^")
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| 13 | I VERSION'="",VERSION'=1 Q ""
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| 14 | S SIG=$P(RECORD1,"^",2)
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| 15 | D1 ;decode e signature for version 1
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| 16 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
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| 17 | Q $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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| 18 | ENCODE(LEVEL0,LEVEL1,USERNUM,Y) ;Encode e signature for version 1 only
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| 19 | NEW RECORD,RECORD1,SIGBLOCK,CHECKSUM,OLDUSER
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| 20 | S USERNUM=+USERNUM
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| 21 | I USERNUM=0 S Y=-3 Q ;-3 no user number
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| 22 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 23 | I SIGBLOCK="" S Y=-2 Q ;-2 no signature block
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| 24 | S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
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| 25 | S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
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| 26 | I RECORD="" S Y=-1 Q ;-1 no 2237 record
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| 27 | I $P(RECORD1,"^",2)'="" S Y=-4 Q ;-4 cannot re-sign record
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| 28 | S OLDUSER=+$P(RECORD1,"^",1)
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| 29 | I OLDUSER=0 S $P(RECORD1,"^",1)=USERNUM
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| 30 | I OLDUSER>0 S USERNUM=OLDUSER
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| 31 | S:$P(RECORD1,"^",3)="" $P(RECORD1,"^",3)=$$NOW^PRCUESIG
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| 32 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
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| 33 | S $P(RECORD1,"^",2)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 34 | S $P(RECORD,"^",9,10)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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| 35 | S ^PRC(442,LEVEL0,6,LEVEL1,0)=RECORD
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| 36 | S ^PRC(442,LEVEL0,6,LEVEL1,1)=RECORD1
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| 37 | S Y=1 Q
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| 38 | RECODE(LEVEL0,LEVEL1,Y) ;Recode ESIG for version 1 only
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| 39 | N RECORD,RECORD1,SIGBLOCK,CHECKSUM,USERNUM
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| 40 | S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
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| 41 | S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
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| 42 | I RECORD=""!(RECORD1="") S Y=-1 Q ;-1 no record
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| 43 | S USERNUM=+$P(RECORD1,"^")
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| 44 | I $P(RECORD1,"^",2)=""!(USERNUM=0) S Y=-4 Q ;-4 cannot recode record
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| 45 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 46 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
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| 47 | S $P(RECORD1,"^",2)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 48 | S $P(RECORD,"^",9,10)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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| 49 | S ^PRC(442,LEVEL0,6,LEVEL1,0)=RECORD
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| 50 | S ^PRC(442,LEVEL0,6,LEVEL1,1)=RECORD1
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| 51 | S Y=1 ;1 record recoded properly
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| 52 | Q
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| 53 | REMOVE(LEVEL0,LEVEL1) ;Entry point to remove e signature from record
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| 54 | NEW I,RECORD,RECORD1
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| 55 | S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
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| 56 | S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
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| 57 | F I=10 S $P(RECORD,"^",I)=""
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| 58 | F I=1,2,3 S $P(RECORD1,"^",I)=""
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| 59 | S ^PRC(442,LEVEL0,6,LEVEL1,0)=RECORD
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| 60 | S ^PRC(442,LEVEL0,6,LEVEL1,1)=RECORD1
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| 61 | Q
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| 62 | VERIFY(LEVEL0,LEVEL1) ;extrinsic function to verify version 1 signature. Returns 1 if valid
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| 63 | NEW RECORD,RECORD1,VERSION,SIGBLOCK
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| 64 | S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
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| 65 | S VERSION=$P(RECORD,"^",9),SIGBLOCK=$P(RECORD,"^",10)
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| 66 | I VERSION_SIGBLOCK="" Q 1
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| 67 | Q ($$SUM^PRCUESIG($$DECODE(LEVEL0,LEVEL1))=SIGBLOCK)
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| 68 | STRING(X,X1) ;Build String of critical fields
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| 69 | Q $P(X,"^",1,4)_"^"_$P(X1,"^",3)
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