Update rustls dependency

This is a breaking change for those who are using the rustls feature, so
the major version has been bumped.

Cargo.toml

@@ -1,21 +1,21 @@
 [package]
 name = "x509-signature"
-version = "0.4.0"
+version = "0.5.0"
 authors = ["Parity Technologies <[email protected]>"]
 edition = "2018"
 license = "MIT OR Apache-2.0"
 description = "Low-level X.509 parsing and signature verification library"
 repository = "https://github.com/paritytech/x509-signature"
-keywords = ["X509", "ASN1", "cryptography"]
+keywords = ["X509", "ASN1", "cryptography", "pki"]
 
 [dependencies]
-ring = { version = "0.16.12", default-features = false }
-untrusted = "0.7.0"
-w = { package = "webpki", version = "0.21.2", optional = true, default-features = false }
-r = { package = "rustls", version = "0.17.0", optional = true }
+ring = { version = "0.16.15", default-features = false }
+untrusted = "0.7.1"
+w = { package = "webpki", version = "0.21.3", optional = true, default-features = false }
+r = { package = "rustls", version = "0.18.0", optional = true }
 
 [dev-dependencies]
-chrono = "0.4.11"
+chrono = "0.4.13"
 
 [features]
 default = ["rsa"]

src/lib.rs

@@ -149,19 +149,6 @@ pub struct X509Certificate<'a> {
     extensions: ExtensionIterator<'a>,
 }
 
-#[cfg(any())]
-pub fn convert_ymd(time: std::time::SystemTime) -> Result<i64, Error> {
-    match time.duration_since(std::time::UNIX_EPOCH) {
-        Ok(d) =>
-            if d.as_secs() > MAX_ASN1_TIMESTAMP as u64 {
-                Ok(d.as_secs() as i64)
-            } else {
-                Err(Error::BadDERTime)
-            },
-        Err(d) => Ok(-(d.duration().as_secs() as i64)),
-    }
-}
-
 impl<'a> X509Certificate<'a> {
     /// The tbsCertificate, signatureAlgorithm, and signature
     pub fn das(&self) -> DataAlgorithmSignature<'a> { self.das }

src/time.rs

@@ -1,5 +1,4 @@
 use super::Error;
-use core::convert::TryInto;
 use ring::io::der;
 
 /// An ASN.1 timestamp.
@@ -87,7 +86,7 @@ pub(super) fn read_time(reader: &mut untrusted::Reader<'_>) -> Result<ASN1Time,
             let year = collect!(y1, y2);
             (if year > 49 { 1900 } else { 2000u16 }) + u16::from(year)
         },
-        (GENERALIZED_TIME, &[y1, y2, y3, y4]) => collect!(y1, y2, y3, y4).try_into().unwrap(),
+        (GENERALIZED_TIME, &[y1, y2, y3, y4]) => collect!(y1, y2, y3, y4),
         _ => return Err(Error::BadDER),
     };
     Ok(ASN1Time(