pkcs#1

Sorry for my english and honestly I have a very little understanding on this so please bear with me. I am developing a java application that sends a signed request to a Server. To do so, I have to generate a PKCS#1 RSA key pair in PEM format for signing and verification. I've tried using OpenSSL v.1.0.1 . but the public key generated is a X.509 PEM . Here's the openssl command I used to generate the keys: Private Key : openssl genrsa -out name_of_private_key.pem 1024 Public Key openssl rsa -in name_of_private_key.pem -pub out > name_of_public_key.pem I've gone through this thread also and I

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

The PublicKey.getEncoded(), returns a byte array containing the public key in SubjectPublicKeyInfo (x.509) format, how do i convert it to RSA public key encoding? martijno Use Bouncy Castle's SubjectPublicKeyInfo , like this: byte[] encoded = publicKey.getEncoded(); SubjectPublicKeyInfo subjectPublicKeyInfo = new SubjectPublicKeyInfo( ASN1Sequence.getInstance(encoded)); byte[] otherEncoded = subjectPublicKeyInfo.parsePublicKey().getEncoded(); Without BouncyCastle: PublicKey publicKey = KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(publicKeyBinary)); The following snippet

Can some one help me understand how an RSA key literally is stored in these formats? I would like to know the difference between the PKCS formats vs Encodings(DER, PEM). From what I understand PEM is more human readable. Is PEM/DER for keys/certs similar to UTF-8/16 for characters? What is the significance of DER/PEM? Sorry too many questions but fed up googling and getting vague answers. Thanks. Luke Joshua Park PKCS#1 and PKCS#8 (Public-Key Cryptography Standard) are standards that govern the use of particular cryptographic primitives, padding, etc. Both define file formats that are used to

When I generate an RSA key pair using the Java API, the public key is encoded in the X.509 format and the private key is encoded in the PKCS#8 format. I'm looking to encode both as PKCS#1. Is this possible? I've spent a considerable amount of time going through the Java docs but haven't found a solution. The result is the same when I use the Java and the Bouncy Castle providers. Here is a snippet of the code: KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA","BC"); keygen.initialize(1024); KeyPair pair = keygen.generateKeyPair(); PrivateKey priv = pair.getPrivate(); PublicKey pub =