issue rust-bitcoin#1802 - replace FromStr with TryFrom impl trait in …

…ecdsa.rs crypto module

bitcoin/src/crypto/ecdsa.rs

@@ -6,12 +6,17 @@
 
 use core::str::FromStr;
 use core::{fmt, iter};
+use core::convert::TryFrom;
+use alloc::boxed::Box;
 
 #[cfg(feature = "arbitrary")]
 use arbitrary::{Arbitrary, Unstructured};
 use hex::FromHex;
 use internals::{impl_to_hex_from_lower_hex, write_err};
 use io::Write;
+use alloc::rc::Rc;
+use alloc::sync::Arc;
+use alloc::string::String;
 
 use crate::prelude::{DisplayHex, Vec};
 use crate::script::PushBytes;
@@ -94,6 +99,46 @@ impl FromStr for Signature {
     }
 }
 
+impl TryFrom<&str> for Signature {
+    type Error = ParseSignatureError;
+
+    fn try_from(s: &str) -> Result<Self, Self::Error> {
+        Self::from_str(s)
+    }
+}
+
+impl TryFrom<String> for Signature {
+    type Error = ParseSignatureError;
+
+    fn try_from(s: String) -> Result<Self, Self::Error> {
+        Self::from_str(&s)
+    }
+}
+
+impl TryFrom<Box<str>> for Signature {
+    type Error = ParseSignatureError;
+
+    fn try_from(s: Box<str>) -> Result<Self, Self::Error> {
+        Self::from_str(&s)
+    }
+}
+
+impl TryFrom<Arc<str>> for Signature {
+    type Error = ParseSignatureError;
+
+    fn try_from(s: Arc<str>) -> Result<Self, Self::Error> {
+        Self::from_str(&s)
+    }
+}
+
+impl TryFrom<Rc<str>> for Signature {
+    type Error = ParseSignatureError;
+
+    fn try_from(s: Rc<str>) -> Result<Self, Self::Error> {
+        Self::from_str(&s)
+    }
+}
+
 /// Holds signature serialized in-line (not in `Vec`).
 ///
 /// This avoids allocation and allows proving maximum size of the signature (73 bytes).