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POReading public Key from an X509 structure in Javascript
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  1. POReading public Key from an X509 structure in Javascript
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    copied!<p>Hello I have an encoded public key with a X509 structure and I want to extract modulus and the public exponent from it I'm using the following ASN.1 Decoder <a href="http://lapo.it/asn1js/" rel="nofollow">http://lapo.it/asn1js/</a>to read the key but I can't see the modulus or the public exponent in the result I get.</p> <p>This is the key I want to read.</p> <pre><code>30819e300d06092a864886f70d010101050003818c00308188028180599a96c54ef07f5288a061a56386376fd9e2e0a253cb035f2b0c65c85c99153a848a8247d9e28d8be1dbad5e754e8393e591cc53e5abec2f0a44b4844646cc283123fdd799c50dd5acd1277fd9afeb9c5a12a53b9edfff0ac53d6e94e5f1678c3bd0ccd8d08b18d4a42f845b79b8b19203e24e189801ca396f5732bfe628edeb0203010001 </code></pre> <p>This is the result I get from the decoder.</p> <pre><code>SEQUENCE(2 elem) SEQUENCE(2 elem) OBJECT IDENTIFIER1.2.840.113549.1.1.1 NULL BIT STRING(1 elem) SEQUENCE(2 elem) INTEGER(1023 bit) INTEGER65537 </code></pre> <p>Thanks in advance.</p> <pre><code>//Example of what I am expecting to find. 30 819f // SEQUENCE 30 0d // SEQUENCE 06 09 2a864886f70d010101 // OBJECT IDENTIFIER of RSA 05 00 // NULL (parameter) 03 818d // BIT STRING 00 // using all following bits 30 8189 // SEQUENCE 02 8181 // (signed) INTEGER 00 // padding (signed INTEGER) followed by the modulus 95e15f182ec7b6e84786c0ee54e3bb72af0461e6fd859a3625f38dcd3fdec80d fcc51a44756ec7cd6c14b430d55670460c5143efadd1ade7380e890e9957d6e6 b38f35412862cc955e04d1928f21c0d2f7bc48c3855276f0e7c1b45a558e3a01 3b969cbfaebca42b748e64bff787f86ec5f0adcd94428c4ab8ca6d2b710d785b 02 03 // (signed) INTEGER 010001 // public exponent (4th number of Fermat) </code></pre>
 

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