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RSAPublicKey is backwards in order of modulus and exponent

See original GitHub issue

OpenSSL doesn’t like the order you have the asn1crypto.keys.RSAPublicKey object. Simply switching the order around let’s things parse correctly. I overrode with my own class, like so:

`class MyRSAPublicKey(Sequence):

_fields = [
    ('public_exponent', Integer),
    ('modulus', Integer),
]`

Example parsing the RSAPublicKey with it currently:

openssl rsa -pubin -inform PEM -text -noout < test.pub Modulus (17 bit): 65537 (0x10001) Exponent: 00:c1:72:a6:ca:26:db:34:1e:8c:27:8d:d4:d6:0f: cd:05:16:55:95:a1:f0:a8:55:b4:a0:28:b1:db:bf: c5:df:f4:7b:b4:65:3f:31:5f:04:60:d8:d2:13:3a: 8a:58:93:78:68:a3:95:78:d8:72:0d:21:d5:f7:c3: a8:ae:7d:3a:ad:71:10:79:cf:8c:32:a3:95:16:92: 6d:63:1a:a3:55:e6:69:9a:37:0a:58:b6:44:dc:fe: be:39:12:d1:56:ef:15:99:8f:e4:ca:91:30:e8:e6: f5:fd:59:c5:17:61:53:b4:91:8d:df:53:8a:cc:b6: 4f:7b:c2:19:83:db:76:8b:44:55:85🇩🇪61:5e:f0: 6f:29:8b:8a:70:af:44:16:b3:2b:27:6b:d6:63:e6: 65:81:ed:19:5c:18:12:31:77:64:30:a0:26:6b:fe: d8:c4:0e:72:f1:26:b4:50:96:d0:e9:b3:8c:c0:bf: a5:67:d5:5f:fc💿be:15:b9:db:6f:4b:eb:f3:85: bc:5d:ef:82:3f:56:09:cf:e4:3a:e6:f6:97:2b:a6: 17:70:5e:3e:76:f4:89:f7:af:ee:9e:6f:89:f6:0c: 2b:b3:3e:97:af:4a:e7:31:f8:39:3f:14:df:62🇩🇪 01:6b:fa:80:14:9c:9e:da:5f:48:7f:e5:8f:b2:02: 01:bf

Example parsing with the order switched:

openssl rsa -pubin -inform PEM -text -noout < test.pub Modulus (2048 bit): 00:c1:72:a6:ca:26:db:34:1e:8c:27:8d:d4:d6:0f: cd:05:16:55:95:a1:f0:a8:55:b4:a0:28:b1:db:bf: c5:df:f4:7b:b4:65:3f:31:5f:04:60:d8:d2:13:3a: 8a:58:93:78:68:a3:95:78:d8:72:0d:21:d5:f7:c3: a8:ae:7d:3a:ad:71:10:79:cf:8c:32:a3:95:16:92: 6d:63:1a:a3:55:e6:69:9a:37:0a:58:b6:44:dc:fe: be:39:12:d1:56:ef:15:99:8f:e4:ca:91:30:e8:e6: f5:fd:59:c5:17:61:53:b4:91:8d:df:53:8a:cc:b6: 4f:7b:c2:19:83:db:76:8b:44:55:85🇩🇪61:5e:f0: 6f:29:8b:8a:70:af:44:16:b3:2b:27:6b:d6:63:e6: 65:81:ed:19:5c:18:12:31:77:64:30:a0:26:6b:fe: d8:c4:0e:72:f1:26:b4:50:96:d0:e9:b3:8c:c0:bf: a5:67:d5:5f:fc💿be:15:b9:db:6f:4b:eb:f3:85: bc:5d:ef:82:3f:56:09:cf:e4:3a:e6:f6:97:2b:a6: 17:70:5e:3e:76:f4:89:f7:af:ee:9e:6f:89:f6:0c: 2b:b3:3e:97:af:4a:e7:31:f8:39:3f:14:df:62🇩🇪 01:6b:fa:80:14:9c:9e:da:5f:48:7f:e5:8f:b2:02: 01:bf Exponent: 65537 (0x10001)