Synopsys P1735 Proposals

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Synopsys P1735 Proposals

Dave Graubart & Parminder GillNovember 1, 2010

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• Problem Statement• Requirements• Proposals

• Plan: Between now and next meeting: collect feedback and contribute to Twiki

Agenda

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• Interoperability needs not yet met– Rights management– More complex tool flows– EDA tool version control

• These are essential for Synopsys FPGA synthesis in first version of 1735

• We’re now prepared to make contributions

Problem Statement

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More Complex Tool Flow

C or M

High level synthesis

RTL

RTL synthesis

SDC

Formal Verification

Simulation

Netlist

PlacedNetlist

Place & Route

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1. Extensibility to any language2. Tool rights3. User rights4. IP creation tool5. Control of authorized tool versions

Requirements

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• Support existing envelope for Verilog and VHDL

• Support envelope as header in any file– Useful for C, M (Matlab), Edif, SDC, and others

Requirement 1: Extensibility to any language

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• Create rights/control block per key block– Plain text so end-user can view– Digest line that is tamper-proof and tightly

associated with IP– Each right can be conditional

• Narrow scope of public key: key for single tool or family of similar tools, not one key for a big EDA vendor

Requirement 2: Tool Rights

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• Identical mechanism to Tool Rights• Use conditional syntax where condition

varies by user• Condition can be satisfied in multiple ways

such as– License requirement– Password– One-time activation– Arbitrary mechanism

Requirement 3: User Rights

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• Lower barrier for IP author participation• Synopsys can contribute script that uses

OpenSSL to process:– Encryption envelope or source plus commands– Key repository

Requirement 4: Tool for IP Author

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• Allow IP author to specify minimum version of tool– After security fix– After functional enhancement

• Avoid expensive introduction of new keys• Different than P1735 version

Requirement 5: Control of authorized tool versions

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Details and Proposed Solutions

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Encrypted Synthesis flow

RTL

Compile

Map

Netlist

Compiler log messages

Mapper log messages

Log file

Technology view

RTL view

Graphical Views

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RTL

Compile

Map

Netlist


Mapper log messages

Log file

Technology view

RTL view

Graphical Views

Technology viewTechnology view

Mapper log messagesMapper log

messages

NetlistNetlist

RTL viewCompiler log messages

Netlist

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RTL

Compile

Map

Netlist


Mapper log messages

Log file

Technology view

RTL view

Graphical Views

Technology viewTechnology view

Mapper log messagesMapper log

messages

NetlistNetlist

RTL viewCompiler log messages

NetlistVisibilityLog Messages

Output Method

None, No-name,No-restriction

None, Interfaces,No-restriction

None, Encrypted,ObfuscatedPlain-text

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Introducing Control Block

Key Block - Simulation User

Decryption Envelope (current)

Key Block - Synthesis User

Data Block

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Introducing Control Block


Decryption Envelope (enhanced)


Data Block

Control Block - Synthesis User

Basic encryption

Encryption with fine grained controls

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Enhancing Key Block



Session Key (for data-block)

Key Block – Synthesis User


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Enhancing Key Block






Control Block – Synthesis User

Session Key (for control-block)

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Enhancing Key Block




Key Block – Synthesis User B


Control Block – Synthesis User B


Key Block – Synthesis User A


Control Block – Synthesis User A


Separate Control block for each tool

Separate Control block session key

for each tool

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Defining Control Block




Control Block

Control Line: Right=value

Control Line: Right=value, conditionControl Digest

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Syntax Proposal – Key Block

`protect begin_protected`protect key_keyowner=“IP User”, key_method=“rsa”`protect encoding=(enctype=“base64”, …), key_block<session key>

`protect data_method=“des-cbc”`protect encoding=(enctype=“base64”, …), data_blockencoded encrypted IP`protect end_protected


encoded encrypted

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Syntax Proposal – Key Block

`protect begin_protected`protect key_keyowner=“IP User”, key_method=“rsa”`protect encoding=(enctype=“base64”, …), key_blockdata-session-key=<session key>control-session-key=<control session key>



encoded encrypted

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Syntax Proposal – Control Block



Decryption Envelope (re-spaced)

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Syntax Proposal – Control Block


`protect control_keyowner=“IP User”, control_method=“des-cbc”, control_block`protect <right>=<value>`protect <right>=<value>, <conditions>`protect encoding=(enctype=“base64”, …), control_digestencoded encrypted control digest



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Control Block – Internal Details



Data Block

Control Block

Control Line: Right=value

Control Line: Right=value, conditionControl Digest

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Syntax Example – Control Block

`protect begin_protected`protect key_keyowner=“IP User”, key_method=“rsa”`protect encoding=(enctype=“base64”, …), key_blockdata-session-key=<session key>control-session-key=<new session key>

`protect control_keyowner=“IP User”, control_method=“des-cbc”, control_block`protect control_visibility=none`protect control_visibility=unrestricted, data_state=mapped`protect control_log_messages=noname`protect control_output_method=encrypted`protect control_output_method=plain-text, license=(…)`protect encoding=(enctype=“base64”, …), control_digestencoded encrypted control digest


Decryption Envelope (enhanced with examples)

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Introducing Tool Version






Control Block – Synthesis User


Tool Version Synthesis User Tool with version older than this is not allowed to read this IP

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Syntax – Tool Version

`protect begin_protected`protect key_keyowner=“IP User”, key_method=“rsa”`protect encoding=(enctype=“base64”, …), key_blockdata-session-key=<session key>control-session-key=<new session key>tool-version=<version number>`protect control_keyowner=“IP User”, control_method=“des-cbc”, control_block`protect control_visibility=none`protect control_visibility=full, data_state=mapped`protect control_log_messages=noname`protect control_output_method=obfuscated`protect control_output_method=plain-text, license=(…)`protect encoding=(enctype=“base64”, …), control_digestencoded encrypted control digest


Decryption Envelope (enhanced with examples)

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Encryption Script (for IP Vendors)

IP Source FileVerilog sourceVHDL Source…

Key RepositoryIP User A = <Public Key>IP User B = <Public Key>

Encryption Tool/Script

Encrypted IP Source(Decryption Envelope)

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Encryption Script – Enhancements(for non-HDL files)

IP Source FileC/EDIF sourceDesign constraints…

Key RepositoryIP User A = <Public Key>IP User B = <Public Key>

Encryption Tool/Script

IP Encryption Header`protect pragmas

Encrypted IP Source(Decryption Envelope)

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Syntax Example – Encryption Header

`protect key_keyowner=“IP User”, key_method=“rsa”, key_block

`protect control_keyowner=“IP User”, control_method=“des-cbc”, control_block`protect control_visibility=none`protect control_visibility=full, data_state=mapped`protect control_log_messages=noname`protect control_output_method=obfuscated`protect control_output_method=plain-text, license=(…)

`protect data_method=“des-cbc”, begin<IP Source File>.c`protect end

Encryption Header file

Optional. If present, ensures encryption header is linked to specified file only

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End

Thank You

Documents

Synopsys P1735 Proposals