der

We are adding server certificates verification in SSL handshake for one of our clients. Being very new to Cryptography and C world, thought I would first clear my concepts about these things and then start with implementation. So, I googled a lot looking mostly for Certificates concepts, but couldn't clear up my concepts any better to my satisfaction. Actually it added more confusion. :) Here are some things which I don't understand almost at all: 1. What is base64 format? Is it same as DER? 2. PEM file always contains base64 content? 3. What is the format used by Windows Certificate Store? Is

Using the OpenSSL API, I have extracted a custom extension from a X.509v3 certificate with: X509_EXTENSION* ex = X509_get_ext(x509, 4); The X509_EXTENSION object contains a value (ex->value) that is an ASN.1 OCTET STRING. The OCTET STRING contains a DER encoded UTF-8 string. I'm trying to decode the OCTET STRING to get the plain UTF-8 string. I have tried a few things, such as: ASN1_STRING_to_UTF8(&buf, ex->value); and M_ASN1_OCTET_STRING_print(bio, ex->value); int len = BIO_read(bio, buf, buf_size); buf[len] = '\0'; These both give me the DER encoded string. How do I get the plain UTF-8

Closed. This question is off-topic. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it's on-topic for Stack Overflow. I have a .cer certificate file, and need to extract the Public Key. I can only extract to PEM format. The "outform" parameter does nothing . openssl x509 -inform PEM -in certificate.cer -outform DER -pubkey -noout > publickey.der Is it possible to extract in DER format? Solved decoding the base64 PEM file: openssl x509 -in certificate.cer -pubkey -noout | openssl enc -base64 -d > publickey.der Any other idea is welcome.

I have my Private and Public keys in a String in base64 which where encoded using ANS1 DER. I tried creating the instance of a java PrivateKey and PublicKey : byte [] llave2 = DatatypeConverter.parseBase64Binary(key); PKCS8Key pkcs8 = new PKCS8Key( llave2, password.toCharArray()); //line 2 llave2 = pkcs8.getDecryptedBytes(); //line 3 certificado = DatatypeConverter.parseBase64Binary(cer); KeyFactory kf = KeyFactory.getInstance("RSA"); PKCS8EncodedKeySpec ks = new PKCS8EncodedKeySpec(llave2); PrivateKey privateKey = kf.generatePrivate(ks); X509EncodedKeySpec x = new X509EncodedKeySpec

I'm using crypto module to validate a certificate, but both, my certificate and my public key are in DER format. It seems that crypto module does not accept this format. Is there a way (or module) to convert DER to PEM format using NodeJS? I couldn't find any and cannot use command line to call openssl via shell. UPDATE: It's not about HTTPS certificates. It's about general X.509 certificates. And if you mark the question as negative, please leave a comment to justify it. Don't be a stupid if you are not able to help. I think the PEM format is just the DER binary data that has been base64

I am working on an iPhone app that retrieves an RSA public key from an ASP.NET web service in the form: <RSAKeyValue> <Modulus>qdd0paiiBJ+xYaN4TKDdbEzrJJw9xlbRAltb5OPdegjLoW60yOjL/sni52WVsGC9QxpNitZR33dnUscmI0cTJoxkXypPjbD94UpH+p4el2tuKBypHlE7bERApuUp55y8BiRkbQNFH8smZFWDwtIc/PsJryeGf8fAryel8c5V3PU=</Modulus> <Exponent>AQAB</Exponent> </RSAKeyValue> I need to then convert this response into an NSData * of the appropriate format (from some intense Googling, most likely 'ASN.1 DER' binary format. I've got code in place to convert both parts from their Base64 representations to the original binary

I have generated an ECDSA signature in Java and I would like to get the R and S values from it. It is my understanding that the signature I have generated is DER encoded. Can someone please provide me with some Java code (maybe using Bouncy Castle) to retrieve the R and S values as BigIntegers? Note: In case it helps, I generated the signature using a built in provider via the JCE's Signature class and the signature lengths for my P_256 EC key pair hover between 70 and 72 bytes usually. I was able to solve this myself. In case it helps anyone here is how I did it (most exception handling has