i am using AsymmetricAlgorithm.ImportSubjectPublicKeyInfo(ReadOnlySpan, Int32) Method in .net what is the equivalent in .net4.61

Question

i am using AsymmetricAlgorithm.ImportSubjectPublicKeyInfo(ReadOnlySpan, Int32) Method in .net, what is the equivalent in .net4.61 ?

Answer 1

There isn’t one built in.

BouncyCastle can do it, or you can use the System.Formats.Asn1 library (or any other DER library) to read the key. For RSA, it’s fairly straightforward: https://stackoverflow.com/a/54011211/6535399

For DSA it’s just different, for ECC (ECDSA/ECDH) it’s harder because the key structure is more complicated.