48 lines
2.0 KiB
Mathematica
48 lines
2.0 KiB
Mathematica
PRCHES11 ;WISC/RHD/AKS-ESIG MAINTENANCE ROUTINE ; 1/4/93 11:04 AM
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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 FIELD 3 (ELECTRONIC SIGNATURE), FILE 443
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DECODE(LEVEL0) ;Extrinsic Function to return hashed esig to readable form.
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;returns "" if unsuccessful
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NEW RECORD,RECORD1,RECORD12,VERSION,PERSON,SIG,CHECKSUM
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S RECORD=$G(^PRC(443,LEVEL0,0)) I RECORD="" Q ""
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S VERSION=$P(RECORD,"^",14)
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S PERSON=+$P(RECORD,"^",2)
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I VERSION'="",VERSION'=1 Q ""
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S SIG=$P(RECORD,"^",3)
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D1 ;decode e signature for version 1
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S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD))
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Q $$DECODE^PRCUESIG(SIG,PERSON,CHECKSUM)
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ENCODE(LEVEL0,USERNUM,Y) ;Encode esig for version 1 only
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NEW RECORD,SIGBLOCK,CHECKSUM,OLDUSER
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S USERNUM=+USERNUM
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I USERNUM=0 S Y=-3 Q ;-3 no user number
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S SIGBLOCK=$P($G(^VA(200,USERNUM,20)),"^",2)
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I SIGBLOCK="" S Y=-2 Q ;-2 no signature block
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S RECORD=$G(^PRC(443,LEVEL0,0))
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I RECORD="" S Y=-1 Q ;-1 no record
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I $P(RECORD,"^",3)'="" S Y=-4 Q ;-4 cannot re-sign record
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S OLDUSER=+$P(RECORD,"^",2)
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I OLDUSER=0 S $P(RECORD,"^",2)=USERNUM
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I OLDUSER>0 S USERNUM=OLDUSER
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S:$P(RECORD,"^",4)="" $P(RECORD,"^",4)=$$NOW^PRCUESIG
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S CHECKSUM=$$SUM^PRCUESIG(LEVEL0_"^"_$$STRING(RECORD))
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S $P(RECORD,"^",3)=$$ENCODE^PRCUESIG(SIGBLOCK,USERNUM,CHECKSUM)
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S $P(RECORD,"^",14)=1,$P(RECORD,"^",13)=$$SUM^PRCUESIG(SIGBLOCK)
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S ^PRC(443,LEVEL0,0)=RECORD
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S Y=1 Q
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REMOVE(LEVEL0) ;Entry point to remove esig
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NEW I,RECORD
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S RECORD=$G(^PRC(443,LEVEL0,0))
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F I=2,3,4,13 S $P(RECORD,"^",I)=""
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S ^PRC(443,LEVEL0,0)=RECORD
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Q
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VERIFY(LEVEL0) ;extrinsic function to verify version 1 signature. Returns 1 if valid, 0 if not valid
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NEW RECORD,VERSION,SIGBLOCK
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S RECORD=$G(^PRC(443,LEVEL0,0))
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S VERSION=$P(RECORD,"^",14),SIGBLOCK=$P(RECORD,"^",13)
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I VERSION_SIGBLOCK="" Q 1
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Q ($$SUM^PRCUESIG($$DECODE(LEVEL0))=SIGBLOCK)
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STRING(X) ;Build String of critical fields
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Q $P(X,"^")_"^"_$P(X,"^",4)_"^"_$P(X,"^",9)
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