c# - CNG Import ECC Pub/Priv Keyfrom file -


i've been trying find how import ecc key file means ages. have tried accessing ecc cert windows certificate store, .p12 file, , pkcs#8 openssl key file no success.

just 1 of many things have tried is:

streamreader fs = new streamreader("key.pem"); string key = fs.readtoend(); byte[] tempkey = system.text.encoding.ascii.getbytes(key); cngkey cngkey = cngkey.import(tempkey, cngkeyblobformat.pkcs8privateblob);

but no discriptive error messages given, last line either has invalid parameters or in case of code above an error occurred during encode or decode operation.

i using sample program msdn ecdh , altered it use gcm mode of aes. of works fine until try , use pre-generated ecc keys instead of ones created default @ runtime microsoft example. have randomly tried of cngkeyblobformats honest, can't debug because don't know specific formats in raw data.

my key in following format willing use format work (.p12, microsoft store, pkcs#8, etc.)

key.pem

-----begin ec parameters----- ############################## -----end ec parameters----- -----begin ec private key----- ############################## -----end ec private key-----

resources

msdn api , example: ecdiffiehellmancng class

msdn api: cngkey class

msdn blogs: aes gcm mode

openssl - creating ecc keys

although may not issue, cannot ascii encode pem file , act pkcs#8 encoded blob. pkcs#8 specified in asn.1, ber/der encoded. pem base 64 encodes binary encoding , puts header , footer around base 64 indicate type of data encoded.

note encoded parameters may have skipped. these parameters present in encoding of private key.


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