pgp 0.10.2

OpenPGP implementation in Rust
Documentation 
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use chrono::{DateTime, TimeZone, Utc};
use nom::combinator::{map_opt, map_res, rest};
use nom::number::streaming::{be_u16, be_u32, be_u8};
use nom::sequence::tuple;
use num_traits::FromPrimitive;

use crate::crypto::public_key::PublicKeyAlgorithm;
use crate::errors::{Error, IResult};
use crate::packet::public_key_parser::parse_pub_fields;
use crate::types::{KeyVersion, PublicParams, SecretParams};

/// Parse the whole private key, both public and private fields.
fn parse_pub_priv_fields(
    typ: PublicKeyAlgorithm,
) -> impl Fn(&[u8]) -> IResult<&[u8], (PublicParams, SecretParams)> {
    move |i| {
        map_res(tuple((parse_pub_fields(typ), rest)), |(pub_params, v)| {
            let secret_params = SecretParams::from_slice(v, typ, &pub_params)?;
            Ok::<_, Error>((pub_params, secret_params))
        })(i)
    }
}

fn new_private_key_parser(
    key_ver: &KeyVersion,
) -> impl Fn(
    &[u8],
) -> IResult<
    &[u8],
    (
        KeyVersion,
        PublicKeyAlgorithm,
        DateTime<Utc>,
        Option<u16>,
        PublicParams,
        SecretParams,
    ),
> + '_ {
    |i: &[u8]| {
        let (i, created_at) = map_opt(be_u32, |v| Utc.timestamp_opt(i64::from(v), 0).single())(i)?;
        let (i, alg) = map_opt(be_u8, PublicKeyAlgorithm::from_u8)(i)?;
        let (i, params) = parse_pub_priv_fields(alg)(i)?;
        Ok((i, (*key_ver, alg, created_at, None, params.0, params.1)))
    }
}

fn old_private_key_parser(
    key_ver: &KeyVersion,
) -> impl Fn(
    &[u8],
) -> IResult<
    &[u8],
    (
        KeyVersion,
        PublicKeyAlgorithm,
        DateTime<Utc>,
        Option<u16>,
        PublicParams,
        SecretParams,
    ),
> + '_ {
    |i: &[u8]| {
        let (i, created_at) = map_opt(be_u32, |v| Utc.timestamp_opt(i64::from(v), 0).single())(i)?;
        let (i, exp) = be_u16(i)?;
        let (i, alg) = map_opt(be_u8, PublicKeyAlgorithm::from_u8)(i)?;
        let (i, params) = parse_pub_priv_fields(alg)(i)?;
        Ok((
            i,
            (*key_ver, alg, created_at, Some(exp), params.0, params.1),
        ))
    }
}

/// Parse a private key packet (Tag 5)
/// Ref: https://tpools.ietf.org/html/rfc4880.html#section-5.5.1.3
#[allow(clippy::type_complexity)]
pub(crate) fn parse(
    i: &[u8],
) -> IResult<
    &[u8],
    (
        KeyVersion,
        PublicKeyAlgorithm,
        DateTime<Utc>,
        Option<u16>,
        PublicParams,
        SecretParams,
    ),
> {
    let (i, key_ver) = map_opt(be_u8, KeyVersion::from_u8)(i)?;
    let (i, key) = match &key_ver {
        &KeyVersion::V2 | &KeyVersion::V3 => old_private_key_parser(&key_ver)(i)?,
        &KeyVersion::V4 => new_private_key_parser(&key_ver)(i)?,
        KeyVersion::V5 => {
            return Err(nom::Err::Error(crate::errors::Error::ParsingError(
                nom::error::ErrorKind::Switch,
            )))
        }
    };
    Ok((i, key))
}