无法从Java读取OpenSSL生成的ECDSA密钥：InvalidKeySpecException

Question

我创建了一个ECDSA密钥对，并使用OpenSSL导出了公钥，但我无法从Java中读取公钥。

OpenSSL中的密钥生成：

$ openssl ecparam -name secp256k1 -genkey -noout -outform DER | openssl ec -inform DER -pubout -outform DER > secp256k1.public.der

从文件中读取密钥的 Clojure 代码，将 [org.bouncycastle/bcprov-jdk15on “1.56”] 作为依赖项：

(ns adhoc.ecdsa-mismatch
  (:import (java.nio.file Files Paths)
           (java.security Security KeyFactory)
           (java.security.spec X509EncodedKeySpec)))

(when (nil? (Security/getProvider "BC"))
  (Security/addProvider (org.bouncycastle.jce.provider.BouncyCastleProvider.)))

(defn read-bytes
  "Read file from path as byte array."
  [^String path]
  (Files/readAllBytes (Paths/get path (into-array String []))))

(defn read-pubkey
  [^String path]
  (.generatePublic (KeyFactory/getInstance "ECDSA" "BC")
                   (X509EncodedKeySpec. (read-bytes path))))

(require '[adhoc.ecdsa-mismatch :as mm])

(mm/read-pubkey "secp256k1.public.der")
;; InvalidKeySpecException java.lang.NullPointerException  org.bouncycastle.jce.provider.JDKKeyFactory$EC.engineGeneratePublic (:-1)

(.printStackTrace *e)
;; java.security.spec.InvalidKeySpecException: java.lang.NullPointerException
;;  at org.bouncycastle.jce.provider.JDKKeyFactory$EC.engineGeneratePublic(Unknown Source)
;;  at java.security.KeyFactory.generatePublic(KeyFactory.java:328)
;;  at adhoc.ecdsa_mismatch$read_pubkey.invokeStatic(ecdsa_mismatch.clj:16)
;;  at adhoc.ecdsa_mismatch$read_pubkey.invoke(ecdsa_mismatch.clj:14)

使用NIST P-256曲线生成密钥：

$ openssl ecparam -name prime256v1 -genkey -noout -outform DER | openssl ec -inform DER -pubout -outform DER > prime256v1.public.der

从磁盘加载prime256v1：

(println (mm/read-pubkey "prime256v1.public.der"))
;; #object[org.bouncycastle.jce.provider.JCEECPublicKey 0x72369051 EC Public Key
;;             X: 5a690a647dc4b7e80f71f15212b08686c1f717ada7198fa8a0b8c93cec16ecb
;;             Y: 30be46137f328766ef8686675f118760ab0c96c52275bf00cf56097333ea6487
;; ]

公钥的内容:

$ base64 secp256k1.public.der 
MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEsipNgzBpQ0CLgZNw+LhASmh4KmGXnJsOC2dfzq5cVwMn
HfsfHGphaGvZTNoc/lUVrr+ICFK/2D/9up9hHHHHWg==
$ base64 prime256v1.public.der 
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEBaaQpkfcS36A9x8VISsIaGwfcXracZj6iguMk87B
bsswvkYTfzKHZu+GhmdfEYdgqwyWxSJ1vwDPVglzM+pkhw==

Answer 1

解决方案是Java——或者可能是这个版本的BouncyCastle——不支持secp256k1椭圆曲线！在openssl调用中使用更常见的曲线<；code>prime256v1（NIST P-256），生成一个我可以读取的密钥。

成功输出示例：

#<JCEECPublicKey EC Public Key
            X: 89cfd7dfb455e6ea51e578e9ea3505ba1e44a0a5f126e3b280611cf6bb467653
            Y: 565eb189ef15b8ff1b72824a7f0418a7df205797a86c8f30961e9bf0deaaa0c3
>