I am trying find the encryption format of a private key whether it is pkcs1 or pkcs8. Is there any golang code that helps me identify it

CodePudding user response：

Just parse the key, err comes if mismatch.

func pkcs() {

    var pkcs8RSAPrivateKeyHex = `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`
    derBytes, _ := hex.DecodeString(pkcs8RSAPrivateKeyHex)

    _, err := x509.ParsePKCS1PrivateKey(derBytes)
    if err != nil {
        log.Fatalln(err)
        return
    }

}

2022/08/10 15:59:08 x509: failed to parse private key (use ParsePKCS8PrivateKey instead for this key format)

CodePudding user response：

        func main() {
        pemString := `-----BEGIN RSA PRIVATE KEY-----
    Proc-Type: 4,ENCRYPTED
    DEK-Info: DES-EDE3-CBC,1ADE9ED351F5B8C7
    
    z8nRX5jG2eUxcahgzF/Sn47DWXKs/y pOcyYzTA3eBYwkqnjOzSqK9YbV8irAAZm
    uwwoGBCjn7740nCo pEYe ECC4MJBrAl6uPcX6eL0ltj1En5gqFB6bPqFrVa8uuf
    MDoSGJzIcDl9kuLK4xS0q9TE7K5ayrzfn7ecn6/KHjqgIdGtEsrZT1Ajhm6Quubs
    PhCRTldky/o1LegEoooUm2s509EGX2PixAWfTS36Z3UENOSWAgHJCdfybDR7 jvP
    lC9ZHXD/OVcgDVC K3UjF7kV5HMD CosuCwR6oXHEiKGv6X6rW46wyB17ul/zDA5
    6MbQeEDDE3uEa cpAGzeYwudCRttclsBlLKBDHv2DgjI yoGU/GuwuV5Gd9y4fYw
    5ZakGhezbm9W5g4XiuA3wTM9j4x2hNIB2Bexu8b9KlZwJnXZOY8glDcfdT5 kmQL
    CY4LlqZQU/YXFLoGpChidQmIQhxzVsYRx46NK0l hrrJJ2xGz Cj5AhqomOjq69y
    5AAjL3THAj1ys2dy54Ue1m1T4w12Oz fAICVC2mb966821cUjkSzC2QVGqE UdrS
    C9qaMtBvKxumN/88Pl3SsO1tDpgSG4OTcr Hyeh20fg3wVnFPZJZyWDVnv4cXrVs
    SYAk7m3ngAvr XOu8WOdOc8ouuiWlaFhKNpGC6MZT1FKCCD53VANeehdBbYngmrR
    oZAuQBtS1aJpMpP2zcsXcexcuZrHSdVlaU1Cs3JykIXt1kmJDKAcyz1C8dRA23fI
    QlP3Q lbohQpWdS8hSDhetxUaCYHIYHJL3fp/0hsOWrd2oJ7ukNBEPIaEK9FnKHe
    nrAp6spTrtCAFum6UAqiV6eoAyX2SwIJepPivgxcquA7rIeO/D4OZCHRsQtLMFPn
    FG7KYJ0ZcAincs5AKX67hxrZBLt1VvjvqyifdhFEJoCI0vwza1Q9tFtrkJ4dXr5W
    n5wnS8dSZnin9JWYCf1ltxVwPNxlii1jwYmIKM49D3qcmSsKsWNNrAW/nvrkOP0R
    CasZKUGgpYu6cu0T1JYayZyb5gWjawDUkZpdd0E/RS/xk5qvJ6jrcu8QoiOo0s f
    EizdBvhiLuA6SNWHj/ksXf3seTTdHxDdG91iea5t vK1ZJoJC9PTxB18ws6BALCH
    3DGXBo1vdoz7HVTq0YeTwavzhY9l3UYPcNeM6 blEuy7S0p5OoavVevynKXp /Ct
    gsODMh6Xhz1kjPIDfvuA36HJiB84FGED6d2s 7MOTh/z7p5d1OfUMu 0IsyDR6Un
    p17G82ihgZlE9MbJVnAGSpUPQd6gmtdFh7jgu2S7SYqph5P6s/aVlZsH36xVgdRG
    3pdo 7qhuWulBwN9dsdSigy0CLAOiGJAU3Pxu1QdKiwE /Qs6LmLRkLWbd4S42N2
    Ur1xwXiBC8Qz35JZpE6 MyvR4jUybSC6IMhWPHrpQ2sVw6HFlRvPN78egO9zuO6v
    UTqL30g3J5 SS ulLm16xwRgBAiLBYgvDLpfsQB3G3rShOyiNvvOneGZ8FZIerpB
    RVpv18PvAvhFICyUuxVkvTm6j1BObmMvoefPOUWeZHsE Miu/N2UoQ==
    -----END RSA PRIVATE KEY-----`
    
        block, _ := pem.Decode([]byte(pemString))
        _, err := x509.ParsePKCS8PrivateKey(block.Bytes)
        if err != nil {
            fmt.Println(err)
            fmt.Println("hi")
        } else {
            fmt.Println("bye")
        }
    }


asn1: structure error: length too large
hi