Collaborate Disseminate
RFC4055 describes RSAES-OAEP keys and RSASSA-PSS keys.
OpenSSL’s genpkey utility supports let’s you generate RSASSA-PSS keys (you have to set the aglorithm parameter to RSA-PSS) but if it supports RSAES-OAEP keys the documentation certainl… Continue reading how to generate RSAES-OAEP keys?
In the below, I use OpenSSL to create a private key for the secp224k1 curve. Note the length of the private key in the DER – 0x1d. That’s 29 bytes, or 232 bits, not 224. It appears that a leading zero byte has been prepended…. Continue reading OpenSSL ECC key – Additional byte in DER encoding for one curve
I’m trying to create this gimmicky public-private RSA key pair where p and q are the same number. I would want to use the asn1 parser in OpenSSL, but I’m required to specify the coeff parameter, the multiplicative inverse for… Continue reading Can I use OpenSSL to generate a key from asn1 configuration file without specifying the modular multiplicative inverse q^-1 (mod p)
I’m using mbed TLS for ECDH key agreement using Curve25519. The private and public keys are stored and transmitted as Hex strings as easily generated with mbed TLS. Those strings are big-endian. This worked quite fine so far…. Continue reading ASN.1 encoding of X25519 private key
I would like to encapsulate SignedData in EnvelopedData.
I am using BouncyCastle.
After looking in an example, I wrote something like this:
CMSSignedData signedData = gen.generate(new CMSProcessableByteArray(out.toByteArra… Continue reading Nested PKCS7 in BouncyCastle
In RFC6960 (https://tools.ietf.org/html/rfc6960) is written the request data contains the requested service and the OCSP responder checks, if the requested service is provided.
But when I had a look on OCSP’s ASN.1 specifica… Continue reading RFC6960 requested ocsp service definition
In RFC6960 (https://tools.ietf.org/html/rfc6960) is written the request data contains the requested service and the OCSP responder checks, if the requested service is provided.
But when I had a look on OCSP’s ASN.1 specifica… Continue reading RFC6960 requested ocsp service definition
I want to do network protocol-based fuzzing using a network protocol specified in ASN.1.
After investigating the available open source tools I face the deciding between the peach community edition, sulley and boofuzz.
But bec… Continue reading ASN.1-based network protocol fuzzer
I want to do network protocol-based fuzzing using a network protocol specified in ASN.1.
After investigating the available open source tools I face the deciding between the peach community edition, sulley and boofuzz.
But bec… Continue reading ASN.1-based network protocol fuzzer
I am currently building an ASN.1 parser which supposed to decode X.509v3 certificates and epoch files in ASN.1 DER format. The parser is working well apart from one issue which I couldn’t seem to get.
If I decode the DER for… Continue reading ASN.1 encapsulated BITSTRING type in openSSL