英文:
How to write out ecdsa keys using golang crypto?
问题
我有一些Go代码用于生成ECDSA密钥并将其写入文件：
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
ecder, err := x509.MarshalECPrivateKey(priv)
keypem, err := os.OpenFile("ec-key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
pem.Encode(keypem, &pem.Block{Type: "EC PRIVATE KEY", Bytes: ecder})
这段代码可以生成一个"BEGIN EC PRIVATE KEY"块。但是，当你在openssl中写出密钥时，还会得到一个指定所使用曲线的"BEGIN EC PARAMETERS"块。在Go中，有没有一种方法将EC PARAMETERS写入pem文件中呢？
英文:
I have some Go code to generate an ECDSA key and write it to a file:
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
ecder, err := x509.MarshalECPrivateKey(priv)
keypem, err := os.OpenFile("ec-key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
pem.Encode(keypem, &pem.Block{Type: "EC PRIVATE KEY", Bytes: ecder})
This works and generates a "BEGIN EC PRIVATE KEY" block. But when you write the key out in openssl you also get a "BEGIN EC PARAMETERS" block specifying the curve used. Is there a way to write out the EC PARAMETERS to the pem file in Go?
答案1
得分: 8
到目前为止，我找到的一种丑陋的方法是：
对于命名曲线，openssl将ASN.1 OID写入EC PARAMETERS块中。所以我从http://www.ietf.org/rfc/rfc5480.txt查找了P256曲线的OID，并添加了以下代码：
secp256r1, err := asn1.Marshal(asn1.ObjectIdentifier{1, 2, 840, 10045, 3, 1, 7})
pem.Encode(keypem, &pem.Block{Type: "EC PARAMETERS", Bytes: secp256r1})
这对于我的当前用例有效，但我不知道是否可以通用地实现这一点。
英文:
One ugly way I found so far to do it:
For named curves, openssl writes out the ASN.1 OID into the EC PARAMETERS block. So I looked up the OID for the P256 curve from http://www.ietf.org/rfc/rfc5480.txt and added:
secp256r1, err := asn1.Marshal(asn1.ObjectIdentifier{1, 2, 840, 10045, 3, 1, 7})
pem.Encode(keypem, &pem.Block{Type: "EC PARAMETERS", Bytes: secp256r1})
This works for my current use case but I don't know if it's possible to do this generically..
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