| 1 | PRCHES12 ;WISC/RHD/AKS-ESIG MAINTENANCE ROUTINE ;9/23/94 10:49 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 16.5 (ELECTRONIC SIGNATURE), FILE 443.6
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| 5 | DECODE(LEVEL0) ;Extrinsic Function to return hashed esig to readable form.
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| 6 | ;returns "" if unsuccessful
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| 7 | NEW RECORD,RECORD1,RECORD12,VERSION,PERSON,SIG,CHECKSUM
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| 8 | S RECORD=$G(^PRC(443.6,LEVEL0,0)) I RECORD="" Q ""
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| 9 | S RECORD1=$G(^PRC(443.6,LEVEL0,1))
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| 10 | S RECORD12=$G(^PRC(443.6,LEVEL0,12))
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| 11 | S VERSION=$P(RECORD12,"^",11)
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| 12 | S PERSON=+$P(RECORD1,"^",10)
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| 13 | I VERSION'="",VERSION'=1 Q ""
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| 14 | S SIG=$P(RECORD12,"^",2)
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| 15 | D1 ;decode e signature for version 1
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| 16 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD1,RECORD12))
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| 17 | Q $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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| 18 | ENCODE(LEVEL0,USERNUM,Y) ;Encode esig for version 1 only
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| 19 | S Y=-4 Q ;-4 cannot encode record
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| 20 | ;
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| 21 | RECODE(LEVEL0,CHECKSUM,Y) ;Recode esig for version 1 only
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| 22 | NEW RECORD,RECORD1,RECORD12,SIGBLOCK,USERNUM
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| 23 | S RECORD=$G(^PRC(443.6,LEVEL0,0))
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| 24 | S RECORD1=$G(^PRC(443.6,LEVEL0,1))
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| 25 | S RECORD12=$G(^PRC(443.6,LEVEL0,12))
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| 26 | I RECORD="" S Y=-1 Q ;-1 no record
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| 27 | S USERNUM=+$P(RECORD1,"^",10)
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| 28 | I $P(RECORD12,"^",2)=""!(USERNUM=0)!'CHECKSUM S Y=-4 Q ;-4 cannot recode record
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| 29 | ;S SIGBLOCK=$$DECODE^PRCUESIG($P(RECORD12,"^",2),USERNUM,CHECKSUM)
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| 30 | S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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| 31 | S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD,RECORD1,RECORD12))
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| 32 | S $P(RECORD12,"^",2)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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| 33 | S $P(RECORD12,"^",11,12)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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| 34 | S ^PRC(443.6,LEVEL0,12)=RECORD12
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| 35 | S Y=1 Q
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| 36 | REMOVE(LEVEL0) ;Entry point to remove esig from record
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| 37 | NEW I,RECORD1,RECORD12
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| 38 | S RECORD1=$G(^PRC(443.6,LEVEL0,1))
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| 39 | S RECORD12=$G(^PRC(443.6,LEVEL0,12))
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| 40 | F I=2,3,12 S $P(RECORD12,"^",I)=""
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| 41 | S ^PRC(443.6,LEVEL0,1)=RECORD1
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| 42 | S ^PRC(443.6,LEVEL0,12)=RECORD12
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| 43 | Q
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| 44 | VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
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| 45 | NEW RECORD,RECORD1,RECORD12,VERSION,SIGBLOCK
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| 46 | S RECORD12=$G(^PRC(443.6,LEVEL0,12))
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| 47 | S VERSION=$P(RECORD12,"^",11),SIGBLOCK=$P(RECORD12,"^",12)
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| 48 | I VERSION_SIGBLOCK="" Q 1
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| 49 | Q ($$SUM^PRCUESIG($$DECODE(LEVEL0))=SIGBLOCK)
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| 50 | STRING(X,X1,X12) ;Build String of critical fields
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| 51 | Q $P(X,"^")_"^"_$P(X1,"^",15)_"^"_$P(X,"^",3)_"^"_$P(X,"^",7)_"^"_$P(X,"^",9)_"^"_$P(X1,"^",1)_"^"_$P(X,"^",11)_"^"_$P(X,"^",13)_"^"_$P(X12,"^",3)
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