pkcs#8

I use RSACryptoServiceProvider in my C# code, and it's working good I could Export RSA XML private and public keys, but for some reason I need to convert this key to *.pem with format (PKCS8 Unencrypted) my private key like <RSAKeyValue> <Modulus>zYs6baSaRDgLc5fG3/ozwGwS8OAvxd9quE2su+7//Lnz2WuIbe8jMc5kL7p2gsPZUEoB88SFHdGZSYiZJhERDc/1iQ4VsW2/ra8DBW+1m3K33EDvvI3rJ0NIyuRNuwoYql3hYdY0cdW6Gru9ZARCpptgBSJEiUSPjlzDEXz3RaU=</Modulus> <Exponent>AQAB</Exponent> <P>89aDVrzNZuDfkCCUR6LKlxHul64zb4EBUN4vr6VZ4LrjEqT6m7+a/8lIrgSK03R1hDdOzeg79eS0OLH5cbe6xQ==</P> <Q>18vAJpkwmhDSMjcPAE/4LufpZ6ukaOgkcPj9LngZSQlIt

Why is the modulus padded with leading zeros? I was reading PKCS#1 and PKCS#8 but didn't find anything about it. In c# the leading zeros must be removed, does anybody know why? At http://etherhack.co.uk/asymmetric/docs/rsa_key_breakdown.html , you can see that the modulus and exponent have leading zeros. The question is why they have it, I haven't found an explanation anywhere yet. The private key values are encoded as ASN.1 INTEGERs, which are signed values in two's complement format. The leading zero byte is necessary when the MSB of the (unsigned) RSA key value is set. Having the MSB set

I am trying to read the RSA public and private keys files in Java. My RSA public and private key is generated using PuttyGen. (SSH-2 RSA, 1024 bits) The code I am using for reading file is: //public key pubkeyBytes = getBytesFromFile(new File(pubKeyfileName)); KeySpec pubSpec = new X509EncodedKeySpec(pubkeyBytes); RSAPublicKey pubKey =(RSAPublicKey) rsakeyFactory.generatePublic(pubSpec); //private key privkeyBytes = getBytesFromFile(new File(privKeyfileName)); PKCS8EncodedKeySpec privSpec = new PKCS8EncodedKeySpec(privkeyBytes); PrivateKey privKey = rsakeyFactory.generatePrivate(privSpec); It

Is there a way to marshal a PKCS8 private key in go 1.5? e.g. something similar to or starting from x509.MarshalPKCS1PrivateKey ? kofemann Funny enough, there are no standard function to do that, but here is a custom solution: type pkcs8Key struct { Version int PrivateKeyAlgorithm []asn1.ObjectIdentifier PrivateKey []byte } func rsa2pkcs8(key *rsa.PrivateKey) ([]byte, error) { var pkey pkcs8Key pkey.Version = 0 pkey.PrivateKeyAlgorithm = make([]asn1.ObjectIdentifier, 1) pkey.PrivateKeyAlgorithm[0] = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1} pkey.PrivateKey = x509.MarshalPKCS1PrivateKey

I have a password protected, encrypted RSA private key, which was created with PyCrypto (2.6.1) and has according to their docs the following format: PrivateKeyInfo, PKCS#8 (DER SEQUENCE), PEM (RFC1423) , see [ https://www.dlitz.net/software/pycrypto/api/current/Crypto.PublicKey.RSA._RSAobj-class.html#exportKey] . How can I decrypt this RSA key with Bouncycastle/Spongycastle? I've searched Google for quite a long time and only came up with results, that either won't work with version 1.50 (because PEMReader was deprecated and got removed) or with examples of PEMParser who seems to could not

I have private key stored in file in PKCS8 DER format and protected by password. What is the easiest way to read it? Here is the code I use to load unencrypted one: InputStream in = new FileInputStream(privateKeyFilename); byte[] privateKeydata = new byte[in.available()]; in.read(privateKeydata); in.close(); KeyFactory privateKeyFactory = KeyFactory.getInstance("RSA"); PKCS8EncodedKeySpec encodedKeySpec = new PKCS8EncodedKeySpec(privateKeydata); PrivateKey privateKey = privateKeyFactory.generatePrivate(encodedKeySpec); It works fine for unencrypted keys with the same specification. By the way,

I'm trying to load a particular private key encoded in binary DER format ( PKCS#8 ) into Ruby. However, OpenSSL::PKey won't recognize it. I can make it work by doing some console work and transforming it into a PEM like so: openssl pkcs8 -inform DER -in file.key -passin pass:xxxxxxxx >private_key.pem After this, the key can correctly be read. However, since I would like for the whole process to be done in memory instead of writing and reading files. So my question is: Is it possible to load private keys from the binary encoded DER format into Ruby/OpenSSL? Thank you for your time, Fernando Yes