buildchain 0.4.6

Software for creating and managing a distributed and reproducible chain of builds
Documentation 
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use plain::{self, Plain};
use std::u64;
use sodiumoxide::crypto::sign::{verify, PublicKey};

use store::b32enc;

#[repr(packed)]
pub (crate) struct PackedBlockRequest {
    signature: [u8; 64],
    public_key: [u8; 32],
    previous_signature: [u8; 64],
    counter: [u8; 8],
    timestamp: [u8; 8],
    digest: [u8; 48],
}

#[repr(packed)]
pub (crate) struct PackedBlock {
    signature: [u8; 64],
    public_key: [u8; 32],
    previous_signature: [u8; 64],
    counter: u64,
    timestamp: u64,
    request: PackedBlockRequest,
}

unsafe impl Plain for PackedBlock {}

impl PackedBlock {
    // Convert to a usable struct through verification
    pub (crate) fn verify(&self, key: &[u8]) -> Result<Block, String> {
        if &self.public_key != key {
            return Err(format!("public key mismatch"));
        }

        let public_key = PublicKey(self.public_key);
        verify(unsafe { plain::as_bytes(self) }, &public_key);

        Ok(Block {
            signature: b32enc(&self.signature),
            public_key: b32enc(&self.public_key),
            previous_signature: b32enc(&self.previous_signature),
            counter: u64::from_le(self.counter),
            timestamp: u64::from_le(self.timestamp),
            digest: b32enc(&self.request.digest),
        })
    }
}

#[derive(Debug)]
pub struct Block {
    pub signature: String,
    pub public_key: String,
    pub previous_signature: String,
    pub counter: u64,
    pub timestamp: u64,
    pub digest: String,
}