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Questions tagged [hkdf]

(HMAC)-based key derivation function (HKDF), which can be used as a building block in various protocols and applications. The key derivation function (KDF) is intended to support a wide range of applications and requirements, and is conservative in its use of cryptographic hash functions.

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Is HKDF implemented in Java Cryptography Architecture?

In the application I'm writing I need to do HKDF to derive two different keys from one password. Searching for examples on how to it in Java I found these…
Pablo Fernandez
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zero knowledge architecture

I would like to encrypt some user data with the zero-knowledge architecture. I reference the implementation of the bitwarden and don't understand some parts. First, I would like to use the the argon2 to derive the key instead of pbkdf2, since it…
Daniel Chan
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How to use HKDF with ECDiffieHellmanCng

I am attempting to use the ECDiffieHellmanCng class to perform key exchange operations between a desktop and a device connected over BLE. The specs of the system require that HKDF be used to derive the key. That doesn't appear to be an option for…
Sam
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What is the purpose of using HKDF?

I saw a code snippet that generates an AES key by the following steps: Generate a 16-byte random value array. SecureRandom random = new SecureRandom(); byte[] key = new byte[16]; random.nextBytes(key); apply the HKDF to the key to generate a new…
Ya Xiao
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Javacard key derivation (hmac) using javacardx.security.derivation

i am trying to figure out how the javacard derivation functions work, and i must admit i am lost as to how to set up the functions. I figured that the DerivationFunction can be used to derive key, and using ALG_KDF_HKDF i could specify the desired…
Zerg Overmind
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HKDF Android implementation

I'm trying to implement key exchange with HKDF for key derivation. I already looked at Is HKDF implemented in Java Cryptography Architecture? Ask Question , however, I'm still not getting what I am supposed to get. In python, I have the following…
Bram
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EVP_PKEY_CTX_new_id returns NULL openssl 1.1.1g

I am using openssl 1.1.1g to implement parts of the quic RFC. I followed the suggestions in the following link How to use OpenSSL 1.1.1 to implement HDF-Extract? But the very first call (EVP_PKEY_CTX_new_id) fails with…
user16959423
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Implementing the Double Ratchet algorithm

I'm trying to implement from scratch the Double Ratchet algorithm using this as my guide, however I am not an expert of crypto stuff, thus some things are quite unclear: The guide refers to a "root key" RK, and an output of a DH as parameters to…
docdev
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AES Key Generation using HSM and HKDF

We have safenet HSM. Our system requires us to generate AES-256 keys. Which approach shall I take ? Instruct HSM to generate AES keys. Use HSM to create an input key material and use HKDF to derive keys. HSM is supposed to be able to generate high…
XpressDev
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HKDFExpand in NodeJS

I try to implement HKDFExpand in NodeJS using crypto library The goal is to decrypt encrypted bitwarden (password manager) password protected export in NodeJS. I try to mimic the same behavior in NodeJS but the expanded key is different from the…
anonymous
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How to derive keys (HKDF) from two EC key pairs in Dart/Flutter?

I'm currently implementing ISO 18013-5 (mobile driving license) using Dart and Flutter (sorry, can't share the full specification document). Briefly, in order to prevent eavesdropping during a data exchange between a reader (e.g. Police) and a…
Bishop19
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How to do a triple Diffie-Hellman(3 - DH) key agreement in Java using bouncy castle?

There are ample examples on how to do Diffie-Hellman key agreement to compute a shared secret. However, I could not find any example on how to do 3DH in java using bouncy castle(or any security provided to be honest). All of what I am finding,…
Uma Priyadarsi
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Compute ecies hkdf symetric key with pycryptodome

Context: i'm working on making a python version of paymentmethodtoken from the google tink library to work with gpay messages. For that i use only python and PyCryptodome. With that said i'm currently trying to implement an equivalent of the kem…
Bastien B
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Openssl ‘EVP_KDF’ was not declared

In openssl, I want to run the following code sample that I got from the HKDF extraction documentation: #include #include #include ... EVP_KDF *kdf; EVP_KDF_CTX *kctx; unsigned char…
quasimodo
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How to use OpenSSL 1.1.1 to implement HDF-Extract?

I'm trying to implement parts of the QUIC RFC and they note: initial_salt = 0xc3eef712c72ebb5a11a7d2432bb46365bef9f502 initial_secret = HKDF-Extract(initial_salt, client_dst_connection_id) I was just…
ExBigBoss
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