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Questions tagged [der]

Distinguished Encoding Rules (DER) certificate encoding is a method of turning ASN.1 attributes and values into a machine-friendly format.

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How to convert STACK_OF(X509) to DER in OpenSSL 1.1.0?

While working on porting from OpenSSL 0.9.8 to 1.1.0, I have run into a missing function. The OpenSSL team has been busy cleaning up their code base, and one of the cleanups was to remove some ASN handling macros & functions. We used to be able…
user590028
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Create and verify signature in code and from the command line using ECDSA

Problem: Using the written demo code (given below) I can create and verify without problems. However, using the openssl command line tool, verifying a signature (created by the demo code) always seems to fail. What I have done: The demo code creates…
0laf
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Convert "emailAdress=" found in Subject field of x.509 SSL certificate to hexadecimal

I have a 'Subject' of SSL x.509 certificate given as Subject: C=XX, ST=XX, L=XX, O=XX, OU=XX, emailAddress=admin@adobe.pw, CN=trustasia.asia and I want to covert this to binary stream as found in SSL certificate when it is sent on wire, I know…
Muhammad Irshad
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ASN1/ DER grammar for RSA key

I am looking for ASN1 grammar file for DER ASN1 encoding of RSA keys I am looking for grammar file so that i can compile it using ASN1C compiler and subsequently write my own 'c' code using GMP to extract public key out of a given RSA key file. It…
Shubhendu Prakash
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Reading from DER File Forge JS in the Browser

I'm trying to read binary encoded DER files (which could be password encrypted or not) in the browser using Forge.JS https://github.com/digitalbazaar/forge I read in the file this way var selectedFile = event.target.files[0]; var reader = new…
Gakho
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Signing a string with RSA private key on .NET?

byte[] plaintext = System.Text.Encoding.UTF8.GetBytes("AAAAAAAAAAAAA"); TextReader trCer = new StreamReader(@"AA.key"); //key in PEM format PemReader rdCer = new PemReader(trCer); AsymmetricCipherKeyPair o = rdCer.ReadObject() as…
beto
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Converting DER Encoded Key to PEM Format in Java

I am writing Java code to create a pair of RSA keys using the class KeyPairGenerator (which as I understand are created in DER format). I am then wanting to utilize some of the key's bytes in another separate calculation. Therefore, I presume I need…
geofrey rainey
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Sign file with .der-Certificate and create signature (pkcs#7)

The thing I would like to do is: Sign a zip-file with openssl using a certificate and create a signature-file (pkcs#7) What I have/I did so far: I installed openssl and opened the console I created a rsa key (openssl genrsa -out key.pem 2048) I…
Peter Müller
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Convert RSA pem key String to der byte[]

I'm trying to convert an RSA pem key (contained in a String) to a byte[], like this method does when given a .pem file…
Shaun Scovil
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openssl RSA public key does not match key read from C code

I've created a public key file using the following commands: openssl genrsa -out mykey.pem 2046 openssl rsa -in mykey.pem -pubout > mykey.pub I then read it from some C code: public_key = PEM_read_RSA_PUBKEY(fp, NULL, NULL, NULL); and then obtain…
Alan Cabrera
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When should numbers used to derive RSA private key have leading `00`?

Given an RSA private key... -----BEGIN RSA PRIVATE…
Billy Moon
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BouncyCastle Java - Decoding DER encoded OCTET strings

I'm reading in a CER certificate file which gives me an X.509 certificate object. There are several extensions that contain DER encoded OCTET strings. e.g.: Certificate Extensions: 9 [1]: ObjectId: 1.3.6.1.4.1.311.21.10 Criticality=false Extension…
user1513388
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Can a public key be exported in PEM format rather than DER format using BouncyCastle?

I currently use bouncy castle to generate a RSA key pair and export them into files. Currently, the keys are exported in DER format. I would like to know if it is possible to export them in .PEM format instead.
Heshan Perera
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Encode a RSA public key to DER format

I need a RSA public key encoded into DER format. The key-pair is generated using RSACryptoServiceProvider. What I'm looking for is the c# equivalent to the java: PublicKey pubKey = myPair.getPublic(); byte[] keyBytes = pubKey.getEncoded(); I have…
hultqvist
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Go, DER and handling big integers

I want to create a Google Go application that will be able to DER encode and decode big integers (namely, ECDSA signature r and s). From what I understand I should use the asn1 package, but what functions should I be calling? For example, I want to…
ThePiachu
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