pem 0.5.0

// Copyright 2016-2017 Jonathan Creekmore
//
// Licensed under the MIT license <LICENSE.md or
// http://opensource.org/licenses/MIT>. This file may not be
// copied, modified, or distributed except according to those terms.

//! This crate provides a parser and encoder for PEM-encoded binary data.
//! PEM-encoded binary data is essentially a beginning and matching end
//! tag that encloses base64-encoded binary data (see:
//! https://en.wikipedia.org/wiki/Privacy-enhanced_Electronic_Mail).
//!
//! This crate's documentation provides a few simple examples along with
//! documentation on the public methods for the crate.
//!
//! # Usage
//!
//! This crate is [on crates.io](https://crates.io/crates/pem) and can be used
//! by adding `pem` to your dependencies in your project's `Cargo.toml`.
//!
//! ```toml
//! [dependencies]
//! pem = "0.4"
//! ```
//!
//! and this to your crate root:
//!
//! ```rust
//! extern crate pem;
//! ```
//!
//! # Example: parse a single chunk of PEM-encoded text
//!
//! Generally, PEM-encoded files contain a single chunk of PEM-encoded
//! text. Commonly, this is in some sort of a key file or an x.509
//! certificate.
//!
//! ```rust
//!
//! use pem::parse;
//!
//! const SAMPLE: &'static str = "-----BEGIN RSA PRIVATE KEY-----
//! MIIBPQIBAAJBAOsfi5AGYhdRs/x6q5H7kScxA0Kzzqe6WI6gf6+tc6IvKQJo5rQc
//! dWWSQ0nRGt2hOPDO+35NKhQEjBQxPh/v7n0CAwEAAQJBAOGaBAyuw0ICyENy5NsO
//! 2gkT00AWTSzM9Zns0HedY31yEabkuFvrMCHjscEF7u3Y6PB7An3IzooBHchsFDei
//! AAECIQD/JahddzR5K3A6rzTidmAf1PBtqi7296EnWv8WvpfAAQIhAOvowIXZI4Un
//! DXjgZ9ekuUjZN+GUQRAVlkEEohGLVy59AiEA90VtqDdQuWWpvJX0cM08V10tLXrT
//! TTGsEtITid1ogAECIQDAaFl90ZgS5cMrL3wCeatVKzVUmuJmB/VAmlLFFGzK0QIh
//! ANJGc7AFk4fyFD/OezhwGHbWmo/S+bfeAiIh2Ss2FxKJ
//! -----END RSA PRIVATE KEY-----
//! ";
//!
//!  let pem = parse(SAMPLE).unwrap();
//!  assert_eq!(pem.tag, "RSA PRIVATE KEY");
//! ```
//!
//! # Example: parse a set of PEM-encoded test
//!
//! Sometimes, PEM-encoded files contain multiple chunks of PEM-encoded
//! text. You might see this if you have an x.509 certificate file that
//! also includes intermediate certificates.
//!
//! ```rust
//!
//! use pem::parse_many;
//!
//! const SAMPLE: &'static str = "-----BEGIN INTERMEDIATE CERT-----
//! MIIBPQIBAAJBAOsfi5AGYhdRs/x6q5H7kScxA0Kzzqe6WI6gf6+tc6IvKQJo5rQc
//! dWWSQ0nRGt2hOPDO+35NKhQEjBQxPh/v7n0CAwEAAQJBAOGaBAyuw0ICyENy5NsO
//! 2gkT00AWTSzM9Zns0HedY31yEabkuFvrMCHjscEF7u3Y6PB7An3IzooBHchsFDei
//! AAECIQD/JahddzR5K3A6rzTidmAf1PBtqi7296EnWv8WvpfAAQIhAOvowIXZI4Un
//! DXjgZ9ekuUjZN+GUQRAVlkEEohGLVy59AiEA90VtqDdQuWWpvJX0cM08V10tLXrT
//! TTGsEtITid1ogAECIQDAaFl90ZgS5cMrL3wCeatVKzVUmuJmB/VAmlLFFGzK0QIh
//! ANJGc7AFk4fyFD/OezhwGHbWmo/S+bfeAiIh2Ss2FxKJ
//! -----END INTERMEDIATE CERT-----
//!
//! -----BEGIN CERTIFICATE-----
//! MIIBPQIBAAJBAOsfi5AGYhdRs/x6q5H7kScxA0Kzzqe6WI6gf6+tc6IvKQJo5rQc
//! dWWSQ0nRGt2hOPDO+35NKhQEjBQxPh/v7n0CAwEAAQJBAOGaBAyuw0ICyENy5NsO
//! 2gkT00AWTSzM9Zns0HedY31yEabkuFvrMCHjscEF7u3Y6PB7An3IzooBHchsFDei
//! AAECIQD/JahddzR5K3A6rzTidmAf1PBtqi7296EnWv8WvpfAAQIhAOvowIXZI4Un
//! DXjgZ9ekuUjZN+GUQRAVlkEEohGLVy59AiEA90VtqDdQuWWpvJX0cM08V10tLXrT
//! TTGsEtITid1ogAECIQDAaFl90ZgS5cMrL3wCeatVKzVUmuJmB/VAmlLFFGzK0QIh
//! ANJGc7AFk4fyFD/OezhwGHbWmo/S+bfeAiIh2Ss2FxKJ
//! -----END CERTIFICATE-----
//! ";
//!
//!  let pems = parse_many(SAMPLE);
//!  assert_eq!(pems.len(), 2);
//!  assert_eq!(pems[0].tag, "INTERMEDIATE CERT");
//!  assert_eq!(pems[1].tag, "CERTIFICATE");
//! ```

#![recursion_limit = "1024"]

#![deny(missing_docs,
        missing_debug_implementations, missing_copy_implementations,
        trivial_casts, trivial_numeric_casts,
        unsafe_code,
        unstable_features,
        unused_import_braces, unused_qualifications)]

extern crate base64;
#[macro_use]
extern crate error_chain;
#[macro_use]
extern crate lazy_static;
extern crate regex;

pub mod errors;
pub use errors::*;

use regex::bytes::{Captures, Regex};

const REGEX_STR: &'static str =
    r"(?s)-----BEGIN (?P<begin>.*?)-----\s*(?P<data>.*?)-----END (?P<end>.*?)-----\s*";

lazy_static! {
    static ref ASCII_ARMOR: Regex = Regex::new(REGEX_STR).unwrap();
}

/// A representation of Pem-encoded data
#[derive(PartialEq,Debug)]
pub struct Pem {
    /// The tag extracted from the Pem-encoded data
    pub tag: String,
    /// The binary contents of the Pem-encoded data
    pub contents: Vec<u8>,
}

impl Pem {
    fn new_from_captures(caps: Captures) -> Result<Pem> {
        fn as_utf8<'a>(bytes: &'a [u8]) -> Result<&'a str> {
            std::str::from_utf8(bytes).map_err(|e| ErrorKind::NotUtf8(e).into())
        }

        // Verify that the begin section exists
        let tag = as_utf8(caps.name("begin")
                              .ok_or_else(|| ErrorKind::MissingBeginTag)?
                              .as_bytes())?;
        ensure!(!tag.is_empty(), ErrorKind::MissingBeginTag);

        // as well as the end section
        let tag_end = as_utf8(caps.name("end")
                                  .ok_or_else(|| ErrorKind::MissingEndTag)?
                                  .as_bytes())?;
        ensure!(!tag_end.is_empty(), ErrorKind::MissingEndTag);

        // The beginning and the end sections must match
        ensure!(tag == tag_end,
                ErrorKind::MismatchedTags(tag.into(), tag_end.into()));

        // If they did, then we can grab the data section
        let data = as_utf8(caps.name("data")
                               .ok_or_else(|| ErrorKind::MissingData)?
                               .as_bytes())?;

        // And decode it from Base64 into a vector of u8
        let contents = try!(base64::decode_config(&data, base64::MIME)
                                .map_err(ErrorKind::InvalidData));

        Ok(Pem {
               tag: tag.to_owned(),
               contents: contents,
           })
    }
}

/// Parses a single PEM-encoded data from a data-type that can be dereferenced as a [u8].
///
/// # Example: parse PEM-encoded data from a Vec<u8>
/// ```rust
///
/// use pem::parse;
///
/// const SAMPLE: &'static str = "-----BEGIN RSA PRIVATE KEY-----
/// MIIBPQIBAAJBAOsfi5AGYhdRs/x6q5H7kScxA0Kzzqe6WI6gf6+tc6IvKQJo5rQc
/// dWWSQ0nRGt2hOPDO+35NKhQEjBQxPh/v7n0CAwEAAQJBAOGaBAyuw0ICyENy5NsO
/// 2gkT00AWTSzM9Zns0HedY31yEabkuFvrMCHjscEF7u3Y6PB7An3IzooBHchsFDei
/// AAECIQD/JahddzR5K3A6rzTidmAf1PBtqi7296EnWv8WvpfAAQIhAOvowIXZI4Un
/// DXjgZ9ekuUjZN+GUQRAVlkEEohGLVy59AiEA90VtqDdQuWWpvJX0cM08V10tLXrT
/// TTGsEtITid1ogAECIQDAaFl90ZgS5cMrL3wCeatVKzVUmuJmB/VAmlLFFGzK0QIh
/// ANJGc7AFk4fyFD/OezhwGHbWmo/S+bfeAiIh2Ss2FxKJ
/// -----END RSA PRIVATE KEY-----
/// ";
/// let SAMPLE_BYTES: Vec<u8> = SAMPLE.into();
///
///  let pem = parse(SAMPLE_BYTES).unwrap();
///  assert_eq!(pem.tag, "RSA PRIVATE KEY");
/// ```
///
/// # Example: parse PEM-encoded data from a String
/// ```rust
///
/// use pem::parse;
///
/// const SAMPLE: &'static str = "-----BEGIN RSA PRIVATE KEY-----
/// MIIBPQIBAAJBAOsfi5AGYhdRs/x6q5H7kScxA0Kzzqe6WI6gf6+tc6IvKQJo5rQc
/// dWWSQ0nRGt2hOPDO+35NKhQEjBQxPh/v7n0CAwEAAQJBAOGaBAyuw0ICyENy5NsO
/// 2gkT00AWTSzM9Zns0HedY31yEabkuFvrMCHjscEF7u3Y6PB7An3IzooBHchsFDei
/// AAECIQD/JahddzR5K3A6rzTidmAf1PBtqi7296EnWv8WvpfAAQIhAOvowIXZI4Un
/// DXjgZ9ekuUjZN+GUQRAVlkEEohGLVy59AiEA90VtqDdQuWWpvJX0cM08V10tLXrT
/// TTGsEtITid1ogAECIQDAaFl90ZgS5cMrL3wCeatVKzVUmuJmB/VAmlLFFGzK0QIh
/// ANJGc7AFk4fyFD/OezhwGHbWmo/S+bfeAiIh2Ss2FxKJ
/// -----END RSA PRIVATE KEY-----
/// ";
/// let SAMPLE_STRING: String = SAMPLE.into();
///
///  let pem = parse(SAMPLE_STRING).unwrap();
///  assert_eq!(pem.tag, "RSA PRIVATE KEY");
/// ```
pub fn parse<B: AsRef<[u8]>>(input: B) -> Result<Pem> {
    ASCII_ARMOR.captures(&input.as_ref())
        .ok_or_else(|| ErrorKind::MalformedFraming.into())
        .and_then(Pem::new_from_captures)
}

/// Parses a set of PEM-encoded data from a data-type that can be dereferenced as a [u8].
///
/// # Example: parse a set of PEM-encoded data from a Vec<u8>
///
/// ```rust
///
/// use pem::parse_many;
///
/// const SAMPLE: &'static str = "-----BEGIN INTERMEDIATE CERT-----
/// MIIBPQIBAAJBAOsfi5AGYhdRs/x6q5H7kScxA0Kzzqe6WI6gf6+tc6IvKQJo5rQc
/// dWWSQ0nRGt2hOPDO+35NKhQEjBQxPh/v7n0CAwEAAQJBAOGaBAyuw0ICyENy5NsO
/// 2gkT00AWTSzM9Zns0HedY31yEabkuFvrMCHjscEF7u3Y6PB7An3IzooBHchsFDei
/// AAECIQD/JahddzR5K3A6rzTidmAf1PBtqi7296EnWv8WvpfAAQIhAOvowIXZI4Un
/// DXjgZ9ekuUjZN+GUQRAVlkEEohGLVy59AiEA90VtqDdQuWWpvJX0cM08V10tLXrT
/// TTGsEtITid1ogAECIQDAaFl90ZgS5cMrL3wCeatVKzVUmuJmB/VAmlLFFGzK0QIh
/// ANJGc7AFk4fyFD/OezhwGHbWmo/S+bfeAiIh2Ss2FxKJ
/// -----END INTERMEDIATE CERT-----
///
/// -----BEGIN CERTIFICATE-----
/// MIIBPQIBAAJBAOsfi5AGYhdRs/x6q5H7kScxA0Kzzqe6WI6gf6+tc6IvKQJo5rQc
/// dWWSQ0nRGt2hOPDO+35NKhQEjBQxPh/v7n0CAwEAAQJBAOGaBAyuw0ICyENy5NsO
/// 2gkT00AWTSzM9Zns0HedY31yEabkuFvrMCHjscEF7u3Y6PB7An3IzooBHchsFDei
/// AAECIQD/JahddzR5K3A6rzTidmAf1PBtqi7296EnWv8WvpfAAQIhAOvowIXZI4Un
/// DXjgZ9ekuUjZN+GUQRAVlkEEohGLVy59AiEA90VtqDdQuWWpvJX0cM08V10tLXrT
/// TTGsEtITid1ogAECIQDAaFl90ZgS5cMrL3wCeatVKzVUmuJmB/VAmlLFFGzK0QIh
/// ANJGc7AFk4fyFD/OezhwGHbWmo/S+bfeAiIh2Ss2FxKJ
/// -----END CERTIFICATE-----
/// ";
/// let SAMPLE_BYTES: Vec<u8> = SAMPLE.into();
///
///  let pems = parse_many(SAMPLE_BYTES);
///  assert_eq!(pems.len(), 2);
///  assert_eq!(pems[0].tag, "INTERMEDIATE CERT");
///  assert_eq!(pems[1].tag, "CERTIFICATE");
/// ```
///
/// # Example: parse a set of PEM-encoded data from a String
///
/// ```rust
///
/// use pem::parse_many;
///
/// const SAMPLE: &'static str = "-----BEGIN INTERMEDIATE CERT-----
/// MIIBPQIBAAJBAOsfi5AGYhdRs/x6q5H7kScxA0Kzzqe6WI6gf6+tc6IvKQJo5rQc
/// dWWSQ0nRGt2hOPDO+35NKhQEjBQxPh/v7n0CAwEAAQJBAOGaBAyuw0ICyENy5NsO
/// 2gkT00AWTSzM9Zns0HedY31yEabkuFvrMCHjscEF7u3Y6PB7An3IzooBHchsFDei
/// AAECIQD/JahddzR5K3A6rzTidmAf1PBtqi7296EnWv8WvpfAAQIhAOvowIXZI4Un
/// DXjgZ9ekuUjZN+GUQRAVlkEEohGLVy59AiEA90VtqDdQuWWpvJX0cM08V10tLXrT
/// TTGsEtITid1ogAECIQDAaFl90ZgS5cMrL3wCeatVKzVUmuJmB/VAmlLFFGzK0QIh
/// ANJGc7AFk4fyFD/OezhwGHbWmo/S+bfeAiIh2Ss2FxKJ
/// -----END INTERMEDIATE CERT-----
///
/// -----BEGIN CERTIFICATE-----
/// MIIBPQIBAAJBAOsfi5AGYhdRs/x6q5H7kScxA0Kzzqe6WI6gf6+tc6IvKQJo5rQc
/// dWWSQ0nRGt2hOPDO+35NKhQEjBQxPh/v7n0CAwEAAQJBAOGaBAyuw0ICyENy5NsO
/// 2gkT00AWTSzM9Zns0HedY31yEabkuFvrMCHjscEF7u3Y6PB7An3IzooBHchsFDei
/// AAECIQD/JahddzR5K3A6rzTidmAf1PBtqi7296EnWv8WvpfAAQIhAOvowIXZI4Un
/// DXjgZ9ekuUjZN+GUQRAVlkEEohGLVy59AiEA90VtqDdQuWWpvJX0cM08V10tLXrT
/// TTGsEtITid1ogAECIQDAaFl90ZgS5cMrL3wCeatVKzVUmuJmB/VAmlLFFGzK0QIh
/// ANJGc7AFk4fyFD/OezhwGHbWmo/S+bfeAiIh2Ss2FxKJ
/// -----END CERTIFICATE-----
/// ";
///  let SAMPLE_STRING: Vec<u8> = SAMPLE.into();
///
///  let pems = parse_many(SAMPLE_STRING);
///  assert_eq!(pems.len(), 2);
///  assert_eq!(pems[0].tag, "INTERMEDIATE CERT");
///  assert_eq!(pems[1].tag, "CERTIFICATE");
/// ```
pub fn parse_many<B: AsRef<[u8]>>(input: B) -> Vec<Pem> {
    // Each time our regex matches a PEM section, we need to decode it.
    ASCII_ARMOR.captures_iter(&input.as_ref())
        .filter_map(|caps| Pem::new_from_captures(caps).ok())
        .collect()
}

/// Encode a PEM struct into a PEM-encoded data string
///
/// # Example
/// ```rust
///  use pem::{Pem, encode};
///
///  let pem = Pem {
///     tag: String::from("FOO"),
///     contents: vec![1, 2, 3, 4],
///   };
///   encode(&pem);
/// ```
pub fn encode(pem: &Pem) -> String {
    let mut output = String::new();

    let contents;

    if pem.contents.is_empty() {
        contents = String::from("");
    } else {
        contents = base64::encode_config(&pem.contents, base64::Config::new(
            base64::CharacterSet::Standard,
            true,
            true,
            base64::LineWrap::Wrap(64, base64::LineEnding::CRLF)
        ));
    }

    output.push_str(&format!("-----BEGIN {}-----\r\n", pem.tag));
    output.push_str(&format!("{}\r\n", contents));
    output.push_str(&format!("-----END {}-----\r\n", pem.tag));

    output
}

/// Encode multiple PEM structs into a PEM-encoded data string
///
/// # Example
/// ```rust
///  use pem::{Pem, encode_many};
///
///  let data = vec![
///     Pem {
///         tag: String::from("FOO"),
///         contents: vec![1, 2, 3, 4],
///     },
///     Pem {
///         tag: String::from("BAR"),
///         contents: vec![5, 6, 7, 8],
///     },
///   ];
///   encode_many(&data);
/// ```
pub fn encode_many(pems: &[Pem]) -> String {
    pems.iter()
        .map(encode)
        .collect::<Vec<String>>()
        .join("\r\n")
}

#[cfg(test)]
mod test {
    use super::*;

    const SAMPLE: &'static str = "-----BEGIN RSA PRIVATE KEY-----\r
MIIBPQIBAAJBAOsfi5AGYhdRs/x6q5H7kScxA0Kzzqe6WI6gf6+tc6IvKQJo5rQc\r
dWWSQ0nRGt2hOPDO+35NKhQEjBQxPh/v7n0CAwEAAQJBAOGaBAyuw0ICyENy5NsO\r
2gkT00AWTSzM9Zns0HedY31yEabkuFvrMCHjscEF7u3Y6PB7An3IzooBHchsFDei\r
AAECIQD/JahddzR5K3A6rzTidmAf1PBtqi7296EnWv8WvpfAAQIhAOvowIXZI4Un\r
DXjgZ9ekuUjZN+GUQRAVlkEEohGLVy59AiEA90VtqDdQuWWpvJX0cM08V10tLXrT\r
TTGsEtITid1ogAECIQDAaFl90ZgS5cMrL3wCeatVKzVUmuJmB/VAmlLFFGzK0QIh\r
ANJGc7AFk4fyFD/OezhwGHbWmo/S+bfeAiIh2Ss2FxKJ\r
-----END RSA PRIVATE KEY-----\r
\r
-----BEGIN RSA PUBLIC KEY-----\r
MIIBOgIBAAJBAMIeCnn9G/7g2Z6J+qHOE2XCLLuPoh5NHTO2Fm+PbzBvafBo0oYo\r
QVVy7frzxmOqx6iIZBxTyfAQqBPO3Br59BMCAwEAAQJAX+PjHPuxdqiwF6blTkS0\r
RFI1MrnzRbCmOkM6tgVO0cd6r5Z4bDGLusH9yjI9iI84gPRjK0AzymXFmBGuREHI\r
sQIhAPKf4pp+Prvutgq2ayygleZChBr1DC4XnnufBNtaswyvAiEAzNGVKgNvzuhk\r
ijoUXIDruJQEGFGvZTsi1D2RehXiT90CIQC4HOQUYKCydB7oWi1SHDokFW2yFyo6\r
/+lf3fgNjPI6OQIgUPmTFXciXxT1msh3gFLf3qt2Kv8wbr9Ad9SXjULVpGkCIB+g\r
RzHX0lkJl9Stshd/7Gbt65/QYq+v+xvAeT0CoyIg\r
-----END RSA PUBLIC KEY-----\r
";

    #[test]
    fn test_parse_works() {
        let pem = parse(SAMPLE).unwrap();
        assert_eq!(pem.tag, "RSA PRIVATE KEY");
    }

    #[test]
    fn test_parse_invalid_framing() {
        let input = "--BEGIN data-----
        -----END data-----";
        match parse(&input) {
            Err(Error(ErrorKind::MalformedFraming, _)) => assert!(true),
            _ => assert!(false),
        }
    }

    #[test]
    fn test_parse_invalid_begin() {
        let input = "-----BEGIN -----
MIIBOgIBAAJBAMIeCnn9G/7g2Z6J+qHOE2XCLLuPoh5NHTO2Fm+PbzBvafBo0oYo
QVVy7frzxmOqx6iIZBxTyfAQqBPO3Br59BMCAwEAAQJAX+PjHPuxdqiwF6blTkS0
RFI1MrnzRbCmOkM6tgVO0cd6r5Z4bDGLusH9yjI9iI84gPRjK0AzymXFmBGuREHI
sQIhAPKf4pp+Prvutgq2ayygleZChBr1DC4XnnufBNtaswyvAiEAzNGVKgNvzuhk
ijoUXIDruJQEGFGvZTsi1D2RehXiT90CIQC4HOQUYKCydB7oWi1SHDokFW2yFyo6
/+lf3fgNjPI6OQIgUPmTFXciXxT1msh3gFLf3qt2Kv8wbr9Ad9SXjULVpGkCIB+g
RzHX0lkJl9Stshd/7Gbt65/QYq+v+xvAeT0CoyIg
-----END RSA PUBLIC KEY-----";
        match parse(&input) {
            Err(Error(ErrorKind::MissingBeginTag, _)) => assert!(true),
            _ => assert!(false),
        }
    }

    #[test]
    fn test_parse_invalid_end() {
        let input = "-----BEGIN DATA-----
MIIBOgIBAAJBAMIeCnn9G/7g2Z6J+qHOE2XCLLuPoh5NHTO2Fm+PbzBvafBo0oYo
QVVy7frzxmOqx6iIZBxTyfAQqBPO3Br59BMCAwEAAQJAX+PjHPuxdqiwF6blTkS0
RFI1MrnzRbCmOkM6tgVO0cd6r5Z4bDGLusH9yjI9iI84gPRjK0AzymXFmBGuREHI
sQIhAPKf4pp+Prvutgq2ayygleZChBr1DC4XnnufBNtaswyvAiEAzNGVKgNvzuhk
ijoUXIDruJQEGFGvZTsi1D2RehXiT90CIQC4HOQUYKCydB7oWi1SHDokFW2yFyo6
/+lf3fgNjPI6OQIgUPmTFXciXxT1msh3gFLf3qt2Kv8wbr9Ad9SXjULVpGkCIB+g
RzHX0lkJl9Stshd/7Gbt65/QYq+v+xvAeT0CoyIg
-----END -----";
        match parse(&input) {
            Err(Error(ErrorKind::MissingEndTag, _)) => assert!(true),
            _ => assert!(false),
        }
    }

    #[test]
    fn test_parse_invalid_data() {
        let input = "-----BEGIN DATA-----
MIIBOgIBAAJBAMIeCnn9G/7g2Z6J+qHOE2XCLLuPoh5NHTO2Fm+PbzBvafBo0oY?
QVVy7frzxmOqx6iIZBxTyfAQqBPO3Br59BMCAwEAAQJAX+PjHPuxdqiwF6blTkS0
RFI1MrnzRbCmOkM6tgVO0cd6r5Z4bDGLusH9yjI9iI84gPRjK0AzymXFmBGuREHI
sQIhAPKf4pp+Prvutgq2ayygleZChBr1DC4XnnufBNtaswyvAiEAzNGVKgNvzuhk
ijoUXIDruJQEGFGvZTsi1D2RehXiT90CIQC4HOQUYKCydB7oWi1SHDokFW2yFyo6
/+lf3fgNjPI6OQIgUPmTFXciXxT1msh3gFLf3qt2Kv8wbr9Ad9SXjULVpGkCIB+g
RzHX0lkJl9Stshd/7Gbt65/QYq+v+xvAeT0CoyIg
-----END DATA-----";
        match parse(&input) {
            Err(Error(ErrorKind::InvalidData(_), _)) => assert!(true),
            _ => assert!(false),
        }
    }

    #[test]
    fn test_parse_empty_data() {
        let input = "-----BEGIN DATA-----
-----END DATA-----";
        let pem = parse(&input).unwrap();
        assert_eq!(pem.contents.len(), 0);
    }

    #[test]
    fn test_parse_many_works() {
        let pems = parse_many(SAMPLE);
        assert_eq!(pems.len(), 2);
        assert_eq!(pems[0].tag, "RSA PRIVATE KEY");
        assert_eq!(pems[1].tag, "RSA PUBLIC KEY");
    }

    #[test]
    fn test_encode_empty_contents() {
        let pem = Pem {
            tag: String::from("FOO"),
            contents: vec![],
        };
        let encoded = encode(&pem);
        assert!(encoded != "");

        let pem_out = parse(&encoded).unwrap();
        assert_eq!(&pem, &pem_out);
    }

    #[test]
    fn test_encode_contents() {
        let pem = Pem {
            tag: String::from("FOO"),
            contents: vec![1, 2, 3, 4],
        };
        let encoded = encode(&pem);
        assert!(encoded != "");

        let pem_out = parse(&encoded).unwrap();
        assert_eq!(&pem, &pem_out);
    }

    #[test]
    fn test_encode_many() {
        let pems = parse_many(SAMPLE);
        let encoded = encode_many(&pems);

        assert_eq!(SAMPLE, encoded);
    }
}