I'm trying to Der encode a public key, and use it with an external service.
When I get the encoded org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey and send it to the external service, it responds with "ECDSA certificates with unnamed curves are unsupported". (I'm calling publicKey.getEncoding() to get the encoded key)
publicKey.getFormat();
// "X.509"
publicKey.getAlgorithm();
// "ECDH"
publicKey.getQ().curve.getClass().name;
// "org.bouncycastle.math.ec.custom.sec.SecP256R1Curve"
I'm not really sure how to debug from here. I tried saving the raw encoded bytes to a file and inspecting the cert with openssl without success:
> openssl x509 -in test.der -inform der -text -noout
unable to load certificate
62375:error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag:/BuildRoot/Library/Caches/com.apple.xbs/Sources/OpenSSL098/OpenSSL098-64.30.2/src/crypto/asn1/tasn_dec.c:1344:
62375:error:0D06C03A:asn1 encoding routines:ASN1_D2I_EX_PRIMITIVE:nested asn1 error:/BuildRoot/Library/Caches/com.apple.xbs/Sources/OpenSSL098/OpenSSL098-64.30.2/src/crypto/asn1/tasn_dec.c:848:
62375:error:0D08303A:asn1 encoding routines:ASN1_TEMPLATE_NOEXP_D2I:nested asn1 error:/BuildRoot/Library/Caches/com.apple.xbs/Sources/OpenSSL098/OpenSSL098-64.30.2/src/crypto/asn1/tasn_dec.c:768:Field=serialNumber, Type=X509_CINF
62375:error:0D08303A:asn1 encoding routines:ASN1_TEMPLATE_NOEXP_D2I:nested asn1 error:/BuildRoot/Library/Caches/com.apple.xbs/Sources/OpenSSL098/OpenSSL098-64.30.2/src/crypto/asn1/tasn_dec.c:768:Field=cert_info, Type=X509
Any help would be greatly appreciated!
Here's the solution I came up with:
KeyFactory keyFactory = KeyFactory.getInstance("EC");
X509EncodedKeySpec keySpec = keyFactory.getKeySpec(publicKey, X509EncodedKeySpec.class);
return keySpec.getEncoded();