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rse_attestation_flow.svg

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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentStyleType="text/css" height="1087px" preserveAspectRatio="none" style="width:900px;height:1087px;background:#FFFFFF;" version="1.1" viewBox="0 0 900 1087" width="900px" zoomAndPan="magnify"><defs/><g><rect fill="#DDDDDD" height="1075.1719" style="stroke:#181818;stroke-width:0.5;" width="261.5" x="44" y="6"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="20" x="164.75" y="18.0669">AP</text><rect fill="#DDDDDD" height="1075.1719" style="stroke:#181818;stroke-width:0.5;" width="502" x="364" y="6"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="28" x="601" y="18.0669">RSE</text><line style="stroke:#181818;stroke-width:0.5;stroke-dasharray:5.0,5.0;" x1="82" x2="82" y1="56.4297" y2="1046.875"/><line style="stroke:#181818;stroke-width:0.5;stroke-dasharray:5.0,5.0;" x1="266.5" x2="266.5" y1="56.4297" y2="1046.875"/><line style="stroke:#181818;stroke-width:0.5;stroke-dasharray:5.0,5.0;" x1="426" x2="426" y1="56.4297" y2="1046.875"/><line style="stroke:#181818;stroke-width:0.5;stroke-dasharray:5.0,5.0;" x1="553.5" x2="553.5" y1="56.4297" y2="1046.875"/><line style="stroke:#181818;stroke-width:0.5;stroke-dasharray:5.0,5.0;" x1="705" x2="705" y1="56.4297" y2="1046.875"/><line style="stroke:#181818;stroke-width:0.5;stroke-dasharray:5.0,5.0;" x1="822" x2="822" y1="56.4297" y2="1046.875"/><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="48" x="58" y="25.1328"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="34" x="65" y="45.1279">RMM</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="48" x="58" y="1045.875"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="34" x="65" y="1065.8701">RMM</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="49" x="242.5" y="25.1328"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="35" x="249.5" y="45.1279">BL31</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="49" x="242.5" y="1045.875"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="35" x="249.5" y="1065.8701">BL31</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="96" x="378" y="25.1328"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="82" x="385" y="45.1279">DelegAttest</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="96" x="378" y="1045.875"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="82" x="385" y="1065.8701">DelegAttest</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="75" x="516.5" y="25.1328"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="61" x="523.5" y="45.1279">InitAttest</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="75" x="516.5" y="1045.875"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="61" x="523.5" y="1065.8701">InitAttest</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="116" x="647" y="25.1328"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="102" x="654" y="45.1279">MeasuredBoot</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="116" x="647" y="1045.875"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="102" x="654" y="1065.8701">MeasuredBoot</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="59" x="793" y="25.1328"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="45" x="800" y="45.1279">Crypto</text><rect fill="#E2E2F0" height="30.2969" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="59" x="793" y="1045.875"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="45" x="800" y="1065.8701">Crypto</text><rect fill="#EEEEEE" height="3" style="stroke:#EEEEEE;stroke-width:1.0;" width="893" x="0" y="86.9961"/><line style="stroke:#000000;stroke-width:1.0;" x1="0" x2="893" y1="86.9961" y2="86.9961"/><line style="stroke:#000000;stroke-width:1.0;" x1="0" x2="893" y1="89.9961" y2="89.9961"/><rect fill="#EEEEEE" height="23.1328" style="stroke:#000000;stroke-width:2.0;" width="144" x="374.5" y="76.4297"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="125" x="380.5" y="92.4966">RMM Boot phase</text><polygon fill="#181818" points="255,141.8281,265,145.8281,255,149.8281,259,145.8281" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="82" x2="261" y1="145.8281" y2="145.8281"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="99" x="89" y="125.6294">get_realm_key(</text><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="74" x="121" y="140.7622">hash_algo</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="25" x="195" y="140.7622">, ...)</text><polygon fill="#181818" points="414,170.9609,424,174.9609,414,178.9609,418,174.9609" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="267" x2="420" y1="174.9609" y2="174.9609"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="121" x="274" y="169.895">get_delegated_key</text><polygon fill="#181818" points="693,200.0938,703,204.0938,693,208.0938,697,204.0938" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="426" x2="699" y1="204.0938" y2="204.0938"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="127" x="433" y="199.0278">read_measurement</text><rect fill="#FEFFDD" height="53" style="stroke:#181818;stroke-width:0.5;" width="167" x="342" y="217.0938"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="95" x="346" y="233.1606">Compute input</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="110" x="346" y="248.2935">for key derivation</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="159" x="346" y="263.4263">(hash of measurements)</text><polygon fill="#181818" points="810.5,292.625,820.5,296.625,810.5,300.625,814.5,296.625" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="426" x2="816.5" y1="296.625" y2="296.625"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="68" x="433" y="291.5591">derive_key</text><rect fill="#FEFFDD" height="38" style="stroke:#181818;stroke-width:0.5;" width="150" x="351" y="309.625"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="126" x="355" y="325.6919">Compute public key</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="60" x="355" y="340.8247">hash with</text><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="74" x="419" y="340.8247">hash_algo</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="4" x="493" y="340.8247">.</text><rect fill="#FEFFDD" height="38" style="stroke:#181818;stroke-width:0.5;" width="132" x="756" y="357.8906"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="124" x="760" y="373.9575">Seed is provisioned</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="88" x="760" y="389.0903">in the factory.</text><polygon fill="#181818" points="278,418.2891,268,422.2891,278,426.2891,274,422.2891" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;stroke-dasharray:2.0,2.0;" x1="272" x2="425" y1="422.2891" y2="422.2891"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="121" x="284" y="417.2231">get_delegated_key</text><polygon fill="#181818" points="93,447.4219,83,451.4219,93,455.4219,89,451.4219" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;stroke-dasharray:2.0,2.0;" x1="87" x2="266" y1="451.4219" y2="451.4219"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="94" x="99" y="446.356">get_realm_key</text><rect fill="#FEFFDD" height="129" style="stroke:#181818;stroke-width:0.5;" width="154" x="5" y="464.4219"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="102" x="9" y="480.4888">Only private key</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="114" x="9" y="495.6216">is returned. Public</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="104" x="9" y="510.7544">key and its hash</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="126" x="9" y="525.8872">must be computed.</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="134" x="9" y="541.02">Public key is included</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="121" x="9" y="556.1528">in the realm token.</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="125" x="9" y="571.2856">Its hash is the input</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="146" x="9" y="586.4185">for get_platform_token</text><polygon fill="#181818" points="255,630.75,265,634.75,255,638.75,259,634.75" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="82" x2="261" y1="634.75" y2="634.75"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="130" x="89" y="614.5513">get_platform_token(</text><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="104" x="121" y="629.6841">pub_key_hash</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="25" x="225" y="629.6841">, ...)</text><polygon fill="#181818" points="414,659.8828,424,663.8828,414,667.8828,418,663.8828" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="267" x2="420" y1="663.8828" y2="663.8828"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="135" x="274" y="658.8169">get_delegated_token</text><rect fill="#FEFFDD" height="38" style="stroke:#181818;stroke-width:0.5;" width="155" x="348" y="676.8828"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="39" x="352" y="692.9497">Check</text><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="104" x="395" y="692.9497">pub_key_hash</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="128" x="352" y="708.0825">against derived key.</text><polygon fill="#181818" points="542,737.2813,552,741.2813,542,745.2813,546,741.2813" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="426" x2="548" y1="741.2813" y2="741.2813"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="104" x="433" y="736.2153">get_initial_token</text><rect fill="#FEFFDD" height="53" style="stroke:#181818;stroke-width:0.5;" width="181" x="463" y="754.2813"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="168" x="467" y="770.3481">Create the token including</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="21" x="467" y="785.481">the</text><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="104" x="492" y="785.481">pub_key_hash</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="40" x="600" y="785.481">as the</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="99" x="467" y="800.6138">challenge claim</text><polygon fill="#181818" points="693,829.8125,703,833.8125,693,837.8125,697,833.8125" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="554" x2="699" y1="833.8125" y2="833.8125"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="127" x="561" y="828.7466">read_measurement</text><polygon fill="#181818" points="810.5,858.9453,820.5,862.9453,810.5,866.9453,814.5,862.9453" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="554" x2="816.5" y1="862.9453" y2="862.9453"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="69" x="561" y="857.8794">sign_token</text><polygon fill="#181818" points="437,888.0781,427,892.0781,437,896.0781,433,892.0781" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;stroke-dasharray:2.0,2.0;" x1="431" x2="553" y1="892.0781" y2="892.0781"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="104" x="443" y="887.0122">get_initial_token</text><polygon fill="#181818" points="278,917.2109,268,921.2109,278,925.2109,274,921.2109" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;stroke-dasharray:2.0,2.0;" x1="272" x2="425" y1="921.2109" y2="921.2109"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="135" x="284" y="916.145">get_delegated_token</text><polygon fill="#181818" points="93,946.3438,83,950.3438,93,954.3438,89,950.3438" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;stroke-dasharray:2.0,2.0;" x1="87" x2="266" y1="950.3438" y2="950.3438"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="125" x="99" y="945.2778">get_platform_token</text><rect fill="#FEFFDD" height="68" style="stroke:#181818;stroke-width:0.5;" width="116" x="24" y="963.3438"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="108" x="28" y="979.4106">Platform token is</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="101" x="28" y="994.5435">cached. It is not</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="98" x="28" y="1009.6763">changing within</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="90" x="28" y="1024.8091">a power cycle.</text><!--MD5=[84fabec568a656165bea957fac178b53]
    2. 

  2. @startuml
    3. 

  3. skinparam ParticipantPadding 10
    4. 

  4. skinparam BoxPadding 10
    5. 

  5. box AP
    6. 

  6. participant RMM
    7. 

  7. participant BL31
    8. 

  8. endbox
    9. 

  9. box RSE
    10. 

  10. participant DelegAttest
    11. 

  11. participant InitAttest
    12. 

  12. participant MeasuredBoot
    13. 

  13. participant Crypto
    14. 

  14. endbox
    15. 

  15. 

  16. == RMM Boot phase ==
    17. 

  17. 

  18. RMM -> BL31: get_realm_key(\n\t**hash_algo**, ...)
    19. 

  19. BL31 -> DelegAttest: get_delegated_key
    20. 

  20. DelegAttest -> MeasuredBoot: read_measurement
    21. 

  21. Rnote over DelegAttest: Compute input\n\ for key derivation\n\ (hash of measurements)
    22. 

  22. DelegAttest -> Crypto: derive_key
    23. 

  23. Rnote over DelegAttest: Compute public key\n\ hash with **hash_algo**.
    24. 

  24. Rnote over Crypto: Seed is provisioned\n\ in the factory.
    25. 

  25. DelegAttest - -> BL31: get_delegated_key
    26. 

  26. BL31 - -> RMM: get_realm_key
    27. 

  27. Rnote over RMM: Only private key\n\ is returned. Public\n\ key and its hash\n\ must be computed.\nPublic key is included\n\ in the realm token.\n\ Its hash is the input\n\ for get_platform_token
    28. 

  28. RMM -> BL31: get_platform_token(\n\t**pub_key_hash**, ...)
    29. 

  29. BL31 -> DelegAttest: get_delegated_token
    30. 

  30. Rnote over DelegAttest: Check **pub_key_hash**\n\ against derived key.
    31. 

  31. DelegAttest -> InitAttest: get_initial_token
    32. 

  32. Rnote over InitAttest: Create the token including\n\ the **pub_key_hash** as the\n\ challenge claim
    33. 

  33. InitAttest -> MeasuredBoot: read_measurement
    34. 

  34. InitAttest -> Crypto: sign_token
    35. 

  35. InitAttest - -> DelegAttest:  get_initial_token
    36. 

  36. DelegAttest - -> BL31: get_delegated_token
    37. 

  37. BL31 - -> RMM: get_platform_token
    38. 

  38. Rnote over RMM: Platform token is\n\ cached. It is not\n\ changing within\n\ a power cycle.
    39. 

  39. @enduml
    40. 

  40. 

  41. PlantUML version 1.2022.7(Mon Aug 22 19:01:30 CEST 2022)
    42. 

  42. (GPL source distribution)
    43. 

  43. Java Runtime: OpenJDK Runtime Environment
    44. 

  44. JVM: OpenJDK 64-Bit Server VM
    45. 

  45. Default Encoding: UTF-8
    46. 

  46. Language: hu
    47. 

  47. Country: HU
    48. 

  48. --></g></svg>
    49.