<div dir="ltr">Followup<div>I can't even verify rsa signature created with the new sign(rsa,...) function. verify(rsa, ...) returns always false. No problems with old functions such as rsa_sign/rsa_verify.</div><div><br></div><div>What am I doing wrong, could somebody help me?</div><div><br></div><div><div>PrivateKey = [<<0,0,0,2,2,1>>,<<0,0,0,65,0,194,170,51,214,70,17,25,24,39,11,190,238,251,171,164,221,80,251,171,85,16,134,227,199,246,113,207,194,211,53,68,253,54,195,192,2,93,91,107,118,147,218,227,151,148,3,165,184,26,199,213,68,18,25,35,249,207,196,111,26,201,150,255,69>>,<<0,0,0,64,104,90,61,184,186,69,12,116,62,217,98,92,46,21,166,57,194,30,29,119,116,166,32,71,194,252,162,197,193,144,84,98,223,170,137,84,25,86,2,237,128,201,216,139,98,173,122,229,3,62,100,69,241,18,186,249,170,25,156,172,32,228,180,129>>].</div><div><br></div><div><div> PublicKey = [<<0,0,0,2,2,1>>,<<0,0,0,65,0,194,170,51,214,70,17,25,24,39,11,190,238,251,171,164,221,80,251,171,85,16,134,227,199,246,113,207,194,211,53,68,253,54,195,192,2,93,91,107,118,147,218,227,151,148,3,165,184,26,199,213,68,18,25,35,249,207,196,111,26,201,150,255,69>>].</div></div><div><br></div><div><div>Payload = <<"Launch the nukes.">>.</div></div><div><div>Hash = crypto:hash(sha, Payload).</div></div><div><br></div><div>Signature1 = crypto:sign(rsa, sha, {digest, Hash}, PrivateKey). <br></div><div>crypto:verify(rsa, sha, {digest, Hash}, Signature1, PublicKey). %% false</div><div><br></div><div>Signature2 = crypto:sign(rsa, sha, Payload, PrivateKey). <br></div><div>crypto:verify(rsa, sha, Payload, Signature2, PublicKey). %% false<br></div><div><br></div><div><br></div><div><div>SizedBinary = fun(Binary) -> <<(size(Binary)):32/integer,  Binary/binary>> end.</div></div><div><div>Signature3 =  crypto:rsa_sign(SizedBinary(Hash), PrivateKey).</div></div><div><div>crypto:rsa_verify(SizedBinary(Hash), SizedBinary(Signature3), PublicKey). %% true</div></div><div><br></div><div><br></div><div><br></div><div><br></div>четверг, 24 октября 2013 г., 3:07:51 UTC+4 пользователь Evgeny M написал:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;"><div dir="ltr"><div>Hi,</div><div><br></div><div>Is it possible to make RSA signatures compatible between old and new crypto methods? I can't find a way how to do this. </div><div>Here's an example, run in R16B02:</div>
<div><br></div><div>crypto:start().</div><div><br></div><div>%% these two keys are valid RSA keypair</div><div>PrivateKey = [<<0,0,0,2,2,1>>,<<0,0,0,65,0,<wbr>194,170,51,214,70,17,25,24,39,<wbr>11,190,238,251,171,164,221,80,<wbr>251,171,85,16,134,227,199,246,<wbr>113,207,194,211,53,68,253,54,<wbr>195,192,2,93,91,107,118,147,<wbr>218,227,151,148,3,165,184,26,<wbr>199,213,68,18,25,35,249,207,<wbr>196,111,26,201,150,255,69>>,<<<wbr>0,0,0,64,104,90,61,184,186,69,<wbr>12,116,62,217,98,92,46,21,166,<wbr>57,194,30,29,119,116,166,32,<wbr>71,194,252,162,197,193,144,84,<wbr>98,223,170,137,84,25,86,2,237,<wbr>128,201,216,139,98,173,122,<wbr>229,3,62,100,69,241,18,186,<wbr>249,170,25,156,172,32,228,180,<wbr>129>>].</div>
<div>PublicKey = [<<0,0,0,2,2,1>>,<<0,0,0,65,0,<wbr>194,170,51,214,70,17,25,24,39,<wbr>11,190,238,251,171,164,221,80,<wbr>251,171,85,16,134,227,199,246,<wbr>113,207,194,211,53,68,253,54,<wbr>195,192,2,93,91,107,118,147,<wbr>218,227,151,148,3,165,184,26,<wbr>199,213,68,18,25,35,249,207,<wbr>196,111,26,201,150,255,69>>].</div>
<div><br></div><div>SizedBinary = fun(Binary) -> <<(size(Binary)):32/integer,  Binary/binary>> end.</div><div><br></div><div>Payload = <<"Launch the nukes.">>.</div><div><br></div><div>
Hash =  crypto:sha(Payload).</div><div><br></div><div>%%signed with old method</div><div>Signature = crypto:rsa_sign(SizedBinary(<wbr>Hash), PrivateKey).</div><div><br></div><div>%%verify with old method - returns true</div><div>
crypto:rsa_verify(SizedBinary(<wbr>Hash), SizedBinary(Signature), PublicKey).</div><div><br></div><div>%%new method - returns false</div><div>crypto:verify(rsa, sha, {digest, Hash}, Signature, PublicKey).  </div><div><br></div>
<div>%%another try of new method - throws an 'bad argument' exception</div><div>crypto:verify(rsa, sha, {digest, SizedBinary(Hash)}, SizedBinary(Signature), PublicKey).</div><div><br></div><div>%%new method yet again - returns false</div>
<div>crypto:verify(rsa, sha, {digest, Hash}, SizedBinary(Signature), PublicKey). </div></div>
</blockquote></div></div>