tendermint 0.40.4

Tendermint is a high-performance blockchain consensus engine that powers Byzantine fault tolerant applications written in any programming language. This crate provides core types for representing information about Tendermint blockchain networks, including chain information types, secret connections, and remote procedure calls (JSON-RPC).
Documentation 
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//! AppHash serialization with validation

use alloc::borrow::Cow;

use serde::{de, Deserialize, Deserializer, Serializer};
use subtle_encoding::base64;

use crate::{prelude::*, AppHash};

/// Deserialize a base64-encoded string into an [`AppHash`]
pub fn deserialize<'de, D>(deserializer: D) -> Result<AppHash, D::Error>
where
    D: Deserializer<'de>,
{
    let decoded = match Option::<Cow<'_, str>>::deserialize(deserializer)? {
        Some(s) => base64::decode(s.as_bytes()).map_err(de::Error::custom)?,
        None => vec![],
    };
    decoded.try_into().map_err(de::Error::custom)
}

/// Serialize from [`AppHash`] into a base64-encoded string.
pub fn serialize<S>(value: &AppHash, serializer: S) -> Result<S::Ok, S::Error>
where
    S: Serializer,
{
    let base64_bytes = base64::encode(value.as_bytes());
    let base64_string = String::from_utf8(base64_bytes).unwrap();
    // Serialize as Option<String> for symmetry with deserialize
    serializer.serialize_some(&base64_string)
}