modulus and publicExponent index

[InoMurko]

If you load Erlang records from public_key module:

Erlang/OTP 19 [erts-8.1] [source-77fb4f8] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]

Eshell V8.1  (abort with ^G)
1> rr(public_key).
['AAControls','ACClearAttrs','AccessDescription',
 'Algorithm','AlgorithmIdentifier',
 'AlgorithmIdentifierPKCS-10','AlgorithmIdentifierPKCS-8',
 'AlgorithmIdentifierPKCS5v2-0','AlgorithmIdentifierPKSC-7',
 'AlgorithmNull','AnotherName','AttCertValidityPeriod',
 'Attribute','AttributeCertificate',
 'AttributeCertificateInfo','AttributePKCS-10',
 'AttributePKCS-7','AttributeTypeAndValue',
 'Attributes_SETOF',
 'Attributes_SETOF_valuesWithContext_SETOF',
 'AuthorityKeyIdentifier','BasicConstraints',
 'BuiltInDomainDefinedAttribute','BuiltInStandardAttributes',
 'Certificate','CertificateList','CertificationRequest',
 'CertificationRequestInfo',
 'CertificationRequestInfo_attributes_SETOF'|...]
2> #'RSAPublicKey'{}.
#'RSAPublicKey'{modulus = undefined,
                publicExponent = undefined}
3> #'RSAPrivateKey'{}.
#'RSAPrivateKey'{version = undefined,modulus = undefined,
                 publicExponent = undefined,privateExponent = undefined,
                 prime1 = undefined,prime2 = undefined,exponent1 = undefined,
                 exponent2 = undefined,coefficient = undefined,
                 otherPrimeInfos = asn1_NOVALUE}

You can see that modulus is always on index 1 and publicExponent on index 2. This is important because if you use crypto:private_decrypt/4 or crypto:public_encrypt/4 you need to pass the keys as a list [e, n, d, p1, p2, e1, e2, c] or [e, n].

[InoMurko]

@ntrepid8 feedback?

[ntrepid8]

Yup, sorry for delay. Busy week at work. Will address before end of day tomorrow at the latest.

[ntrepid8]

This was a good catch. Thanks for the PR.

[ntrepid8]

This is published on hex.pm as version 0.2.1.