enprot 0.4.0

Engyon Protected Text (EPT) — confidentiality processor and capability ledger
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// Copyright (c) 2018-2026 [Ribose Inc](https://www.ribose.com).
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

pub const VALID_CIPHER_ALGS: &[&str] = &[
    "aes-256-siv",
    "aes-256-gcm",
    "aes-256-gcm-siv",
    "aes-256-gcm-det",
    "aes-256-gcm-siv-det",
];

pub const DEFAULT_MAX_DEPTH: usize = 100;

pub const DEFAULT_LEFT_SEP: &str = "// <(";
pub const DEFAULT_RIGHT_SEP: &str = ")>";

pub const VALID_PBKDF_ALGS: &[&str] = &[
    "argon2",
    "scrypt",
    "pbkdf2-sha256",
    "pbkdf2-sha512",
    "legacy",
];

pub const VALID_POLICIES: &[&str] = &["default", "nist"];
pub const DEFAULT_POLICY: &str = "default";

/// Separator presets for common host languages. Selected via `--lang`.
pub static LANG_SEPARATORS: &[(&str, &str, &str)] = &[
    ("raw", "<(", ")>"),
    ("c", "// <(", ")>"),
    ("python", "# <(", ")>"),
    ("html", "<!-- <(", ")> -->"),
    ("latex", "% <(", ")>"),
];

pub fn lang_separators(lang: &str) -> Option<(&'static str, &'static str)> {
    LANG_SEPARATORS
        .iter()
        .find(|(name, _, _)| *name == lang)
        .map(|(_, l, r)| (*l, *r))
}