JWT Scala- java.security.spec.InvalidKeySpecException - scala

Question

I'm trying to create a JWT with JWT Scala using:
import pdi.jwt._
...
val claim = s"""{ \"exp\": $oneMinuteFromNow }"""
Jwt.encode(claim, key, JwtAlgorithm.ES512)
key is a String containing a private key in the form of
-----BEGIN EC PRIVATE KEY-----
MIGbMBAGByqGSM49AgEGBSuBBAAjA4GGAAQAmG8JrpLz14+qUs7oxFX0pCoe90Ah
MMB/9ZENy8KZ+us26i/6PiBBc7XaiEi6Q8Icz2tiazwSpyLPeBrFVPFkPgIADyLa
T0fp7D2JKHWpdrWQvGLLMwGqYCaaDi79KugPo6V4bnpLBlVtbH4ogg0Hqv89BVyI
ZfwWPCBH+Zssei1VlgM=
-----END EC PRIVATE KEY-----
But I'm getting:
java.security.spec.InvalidKeySpecException: encoded key spec not recognized: wrong version for private key info
at org.bouncycastle.jcajce.provider.asymmetric.util.BaseKeyFactorySpi.engineGeneratePrivate(Unknown Source)
at org.bouncycastle.jcajce.provider.asymmetric.ec.KeyFactorySpi.engineGeneratePrivate(Unknown Source)
at java.security.KeyFactory.generatePrivate(KeyFactory.java:366)
at pdi.jwt.JwtUtils$.parsePrivateKey(JwtUtils.scala:109)
at pdi.jwt.JwtUtils$.sign(JwtUtils.scala:152)
at pdi.jwt.JwtUtils$.sign(JwtUtils.scala:159)
at pdi.jwt.JwtCore$class.encode(Jwt.scala:80)
at pdi.jwt.Jwt$.encode(Jwt.scala:23)
at pdi.jwt.JwtCore$class.encode(Jwt.scala:109)
at pdi.jwt.Jwt$.encode(Jwt.scala:23)
I've Googled everything I can think of, but I'm not sure what I'm doing wrong. Any help appreciated!
(above key is not a real key BTW)

Answer 1

I finally got this working.
openssl ecparam -genkey -name secp521r1 -noout -out ec512-key-pair.pem
Is the command I ued to generate the key. The code to sign the JWT:
object JwtGen {
def generateToken(keyPath: String) : String = {
if (keyPath.isEmpty) throw new java.io.IOException("keyPath is empty!")
val claim = s"""{ \"exp\": $oneMinuteFromNow }"""
Jwt.encode(claim, encodeKey(keyPath), JwtAlgorithm.ES512)
}
private def oneMinuteFromNow: Long = {
(System.currentTimeMillis / 1000) + 60
}
private def encodeKey(keyPath: String): PrivateKey = {
Security.addProvider(new BouncyCastleProvider)
val parser = new PEMParser(new InputStreamReader(new FileInputStream(keyPath)))
val pemObject = Option(parser.readObject)
pemObject match {
case Some(kp: PEMKeyPair) => convertFormat(kp)
case _ => throw new java.io.IOException(s"cannot parse pem file $keyPath")
}
}
private def convertFormat(pemKeyPair: PEMKeyPair): PrivateKey = {
val converter = new JcaPEMKeyConverter
val keyPair = converter.getKeyPair(pemKeyPair)
keyPair.getPrivate
}
}