70 lines
3.0 KiB
Mathematica
70 lines
3.0 KiB
Mathematica
PRCHES6 ;WISC/RHD/AKS-ESIG MAINTENANCE ROUTINE ;8/18/94 3:30 PM
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V ;;5.1;IFCAP;;Oct 20, 2000
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;Per VHA Directive 10-93-142, this routine should not be modified.
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;ROUTINE FOR MAINTAINING SUBFIELD 7 (ELECTRONIC SIGNATURE)
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; FIELD 50 (AMMENDMENT) FILE 442
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DECODE(LEVEL0,LEVEL1) ;Extrinsic Function to return hashed electronic sig to readable form.
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;returns "" if unsuccessful
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NEW RECORD,RECORD1,VERSION,PERSON,SIG,CHECKSUM
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S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0)) I RECORD="" Q ""
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S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
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S VERSION=$P(RECORD,"^",9)
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S PERSON=+$P(RECORD1,"^")
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I VERSION'="",VERSION'=1 Q ""
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S SIG=$P(RECORD1,"^",2)
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D1 ;decode e signature for version 1
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S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
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Q $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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ENCODE(LEVEL0,LEVEL1,USERNUM,Y) ;Encode e signature for version 1 only
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NEW RECORD,RECORD1,SIGBLOCK,CHECKSUM,OLDUSER
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S USERNUM=+USERNUM
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I USERNUM=0 S Y=-3 Q ;-3 no user number
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S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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I SIGBLOCK="" S Y=-2 Q ;-2 no signature block
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S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
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S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
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I RECORD="" S Y=-1 Q ;-1 no 2237 record
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I $P(RECORD1,"^",2)'="" S Y=-4 Q ;-4 cannot re-sign record
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S OLDUSER=+$P(RECORD1,"^",1)
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I OLDUSER=0 S $P(RECORD1,"^",1)=USERNUM
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I OLDUSER>0 S USERNUM=OLDUSER
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S:$P(RECORD1,"^",3)="" $P(RECORD1,"^",3)=$$NOW^PRCUESIG
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S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
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S $P(RECORD1,"^",2)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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S $P(RECORD,"^",9,10)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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S ^PRC(442,LEVEL0,6,LEVEL1,0)=RECORD
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S ^PRC(442,LEVEL0,6,LEVEL1,1)=RECORD1
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S Y=1 Q
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RECODE(LEVEL0,LEVEL1,Y) ;Recode ESIG for version 1 only
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N RECORD,RECORD1,SIGBLOCK,CHECKSUM,USERNUM
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S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
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S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
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I RECORD=""!(RECORD1="") S Y=-1 Q ;-1 no record
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S USERNUM=+$P(RECORD1,"^")
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I $P(RECORD1,"^",2)=""!(USERNUM=0) S Y=-4 Q ;-4 cannot recode record
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S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_LEVEL1_"^"_$$STRING(RECORD,RECORD1))
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S $P(RECORD1,"^",2)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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S $P(RECORD,"^",9,10)="1^"_$$SUM^PRCUESIG(SIGBLOCK)
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S ^PRC(442,LEVEL0,6,LEVEL1,0)=RECORD
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S ^PRC(442,LEVEL0,6,LEVEL1,1)=RECORD1
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S Y=1 ;1 record recoded properly
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Q
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REMOVE(LEVEL0,LEVEL1) ;Entry point to remove e signature from record
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NEW I,RECORD,RECORD1
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S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
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S RECORD1=$G(^PRC(442,LEVEL0,6,LEVEL1,1))
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F I=10 S $P(RECORD,"^",I)=""
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F I=1,2,3 S $P(RECORD1,"^",I)=""
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S ^PRC(442,LEVEL0,6,LEVEL1,0)=RECORD
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S ^PRC(442,LEVEL0,6,LEVEL1,1)=RECORD1
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Q
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VERIFY(LEVEL0,LEVEL1) ;extrinsic function to verify version 1 signature. Returns 1 if valid
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NEW RECORD,RECORD1,VERSION,SIGBLOCK
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S RECORD=$G(^PRC(442,LEVEL0,6,LEVEL1,0))
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S VERSION=$P(RECORD,"^",9),SIGBLOCK=$P(RECORD,"^",10)
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I VERSION_SIGBLOCK="" Q 1
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Q ($$SUM^PRCUESIG($$DECODE(LEVEL0,LEVEL1))=SIGBLOCK)
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STRING(X,X1) ;Build String of critical fields
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Q $P(X,"^",1,4)_"^"_$P(X1,"^",3)
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