Skip to content

Instantly share code, notes, and snippets.

@lrascao

lrascao/gist:22a8f9643edfdde26b4632b7617e36d7

Created April 9, 2019 18:05
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save lrascao/22a8f9643edfdde26b4632b7617e36d7 to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save lrascao/22a8f9643edfdde26b4632b7617e36d7 to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. lrascao revised this gist Apr 9, 2019. No changes.
  2. lrascao created this gist Apr 9, 2019.
    36 changes: 36 additions & 0 deletions gistfile1.txt
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,36 @@
    % check against sigs generated at https://8gwifi.org/ecsignverify.jsp
    % ideas from https://github.com/0x6e6562/otp_ecc/blob/master/src/otp_ecc.erl

    Erlang/OTP 19 [erts-8.3] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]

    Eshell V8.3 (abort with ^G)
    1> PublicBin = <<"-----BEGIN PUBLIC KEY-----
    1> MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAElMlYUyrmL2UJV7hlug5/p1eeoOmXptgM
    1> 3K4h8opBX3rGSFHhOIA2Yw1DBKCXKC8cGnNEUsmCunslB1OaYcFinw==
    1> -----END PUBLIC KEY-----
    1> ">>.
    <<"-----BEGIN PUBLIC KEY-----\nMFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAElMlYUyrmL2UJV7hlug5/p1eeoOmXptgM\n3K4h8opBX3rGSFHhOIA2Yw1D"...>>

    2> [PublicPemEntry] = public_key:pem_decode(PublicBin), PublicKey = public_key:pem_entry_decode(PublicPemEntry).
    {{'ECPoint',<<4,148,201,88,83,42,230,47,101,9,87,184,101,
    186,14,127,167,87,158,160,233,151,166,216,
    12,220,...>>},
    {namedCurve,{1,3,132,0,10}}}

    3> Sig = <<"MEQCIARxV3Lmms1vLhdlShi6qyfA+wu7fWrttekksOk/o/FbAiA0Y5/yYI4yAuXKqO/zrQjkju+hMfGw8Jus8V5b/hVTLQ==">>.
    <<"MEQCIARxV3Lmms1vLhdlShi6qyfA+wu7fWrttekksOk/o/FbAiA0Y5/yYI4yAuXKqO/zrQjkju+hMfGw8Jus8V5b/hVTLQ==">>

    4> public_key:verify(<<"a">>, sha256, base64:decode(Sig), PublicKey).
    true

    5> public_key:verify(<<"aa">>, sha256, base64:decode(Sig), PublicKey).
    false

    6> f(Sig).
    ok

    7> Sig = <<"MEUCIQCFjP4VGwDmCcGLbPWUtJdY67TuaohaNipgbBiGriw1GQIgERxAwDiVQs3c6hy4beMaz5BDVk12fr3mf3gScKFDQYA=">>.
    <<"MEUCIQCFjP4VGwDmCcGLbPWUtJdY67TuaohaNipgbBiGriw1GQIgERxAwDiVQs3c6hy4beMaz5BDVk12fr3mf3gScKFDQYA=">>

    8> public_key:verify(<<"aa">>, sha256, base64:decode(Sig), PublicKey).
    true