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@whitehat-xyz/ed25519-ecies

v1.0.0

Published

6 months ago

An ECIES implementation for ed25519 keys on Solana

Downloads

4

0High
0Medium
0Low

Ed25519 ECIES

SIE1: A BIE1-based ECIES implementation that is compatible with Ed25519 keys on Solana.

Encryption

The encryption protocol does the following:

Converts an Ed25519 public and private key to their X25519 keys. If no private key is provided, a new one is generated on the fly.
Computes a shared secret using ECDH
Creates a Public key from the shared secret
SHA512 hashes it and splits the resulting bytes into iv, kE and kM
AESCBC encrypts the desired message with kE and iv
Checksums the message with kM using SHA256-HMAC

Decryption

The decryption protocol reverses this by:

Takes in the private key of the opposing public key provided in the encryption phase
Extracts the public key of the opposing private key provided/created in the encryption phase
Computes the same shared secret using ECDH, but with the opposing keys to those in the encryption phase
Creates a Public key from the shared secret
SHA512 hashes it and splits the resulting bytes into iv, kE and kM
AESCBC decrypts the ciphertext with kE and iv
Calculates the SHA256-HMAC of the message to ensure the provided checksum matches