rust-bitcoin · apoelstra · Sep 2, 2023 · Aug 28, 2023
diff --git a/Cargo-minimal.lock b/Cargo-minimal.lock
@@ -10,9 +10,9 @@ checksum = "08f9b8508dccb7687a1d6c4ce66b2b0ecef467c94667de27d8d7fe1f8d2a9cdc"
 
 [[package]]
 name = "base64"
-version = "0.13.0"
+version = "0.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
+checksum = "414dcefbc63d77c526a76b3afcf6fbb9b5e2791c19c3aa2297733208750c6e53"
 
 [[package]]
 name = "bech32"

diff --git a/Cargo-recent.lock b/Cargo-recent.lock
@@ -10,9 +10,9 @@ checksum = "9c7d0618f0e0b7e8ff11427422b64564d5fb0be1940354bfe2e0529b18a9d9b8"
 
 [[package]]
 name = "base64"
-version = "0.13.1"
+version = "0.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
+checksum = "414dcefbc63d77c526a76b3afcf6fbb9b5e2791c19c3aa2297733208750c6e53"
 
 [[package]]
 name = "bech32"

diff --git a/bitcoin/Cargo.toml b/bitcoin/Cargo.toml
@@ -41,7 +41,7 @@ hashes = { package = "bitcoin_hashes", version = "0.13.0", default-features = fa
 secp256k1 = { version = "0.27.0", default-features = false, features = ["bitcoin_hashes"] }
 hex_lit = "0.1.1"
 
-base64 = { version = "0.13.0", optional = true }
+base64 = { version = "0.21.3", optional = true }
 # Only use this feature for no-std builds, otherwise use bitcoinconsensus-std.
 bitcoinconsensus = { version = "0.20.2-0.5.0", default-features = false, optional = true }
 

diff --git a/bitcoin/src/psbt/mod.rs b/bitcoin/src/psbt/mod.rs
@@ -818,6 +818,7 @@ mod display_from_str {
     use core::str::FromStr;
 
     use base64::display::Base64Display;
+    use base64::prelude::{Engine as _, BASE64_STANDARD};
     use internals::write_err;
 
     use super::{Error, Psbt};
@@ -857,15 +858,15 @@ mod display_from_str {
 
     impl Display for Psbt {
         fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
-            write!(f, "{}", Base64Display::with_config(&self.serialize(), base64::STANDARD))
+            write!(f, "{}", Base64Display::new(&self.serialize(), &BASE64_STANDARD))
         }
     }
 
     impl FromStr for Psbt {
         type Err = PsbtParseError;
 
         fn from_str(s: &str) -> Result<Self, Self::Err> {
-            let data = base64::decode(s).map_err(PsbtParseError::Base64Encoding)?;
+            let data = BASE64_STANDARD.decode(s).map_err(PsbtParseError::Base64Encoding)?;
             Psbt::deserialize(&data).map_err(PsbtParseError::PsbtEncoding)
         }
     }

diff --git a/bitcoin/src/sign_message.rs b/bitcoin/src/sign_message.rs
@@ -26,8 +26,6 @@ mod message_signing {
 
     use crate::address::{Address, AddressType};
     use crate::crypto::key::PublicKey;
-    #[cfg(feature = "base64")]
-    use crate::prelude::*;
 
     /// An error used for dealing with Bitcoin Signed Messages.
     #[derive(Debug, Clone, PartialEq, Eq)]
@@ -159,37 +157,40 @@ mod message_signing {
                 None => Ok(false),
             }
         }
-
-        /// Convert a signature from base64 encoding.
-        #[cfg(feature = "base64")]
-        pub fn from_base64(s: &str) -> Result<MessageSignature, MessageSignatureError> {
-            let bytes = base64::decode(s).map_err(|_| MessageSignatureError::InvalidBase64)?;
-            MessageSignature::from_slice(&bytes)
-        }
-
-        /// Convert to base64 encoding.
-        #[cfg(feature = "base64")]
-        pub fn to_base64(self) -> String { base64::encode(&self.serialize()[..]) }
     }
 
     #[cfg(feature = "base64")]
-    impl fmt::Display for MessageSignature {
-        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-            let bytes = self.serialize();
-            // This avoids the allocation of a String.
-            write!(
-                f,
-                "{}",
-                base64::display::Base64Display::with_config(&bytes[..], base64::STANDARD)
-            )
+    mod base64_impls {
+        use base64::prelude::{Engine as _, BASE64_STANDARD};
+
+        use super::*;
+        use crate::prelude::String;
+
+        impl MessageSignature {
+            /// Convert a signature from base64 encoding.
+            pub fn from_base64(s: &str) -> Result<MessageSignature, MessageSignatureError> {
+                let bytes =
+                    BASE64_STANDARD.decode(s).map_err(|_| MessageSignatureError::InvalidBase64)?;
+                MessageSignature::from_slice(&bytes)
+            }
+
+            /// Convert to base64 encoding.
+            pub fn to_base64(self) -> String { BASE64_STANDARD.encode(self.serialize()) }
         }
-    }
 
-    #[cfg(feature = "base64")]
-    impl core::str::FromStr for MessageSignature {
-        type Err = MessageSignatureError;
-        fn from_str(s: &str) -> Result<MessageSignature, MessageSignatureError> {
-            MessageSignature::from_base64(s)
+        impl fmt::Display for MessageSignature {
+            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                let bytes = self.serialize();
+                // This avoids the allocation of a String.
+                write!(f, "{}", base64::display::Base64Display::new(&bytes, &BASE64_STANDARD))
+            }
+        }
+
+        impl core::str::FromStr for MessageSignature {
+            type Err = MessageSignatureError;
+            fn from_str(s: &str) -> Result<MessageSignature, MessageSignatureError> {
+                MessageSignature::from_base64(s)
+            }
         }
     }
 }
@@ -260,6 +261,7 @@ mod tests {
     #[test]
     #[cfg(all(feature = "secp-recovery", feature = "base64"))]
     fn test_incorrect_message_signature() {
+        use base64::prelude::{Engine as _, BASE64_STANDARD};
         use secp256k1;
 
         use crate::crypto::key::PublicKey;
@@ -276,8 +278,9 @@ mod tests {
         let signature =
             super::MessageSignature::from_base64(signature_base64).expect("message signature");
 
-        let pubkey = PublicKey::from_slice(&base64::decode(pubkey_base64).expect("base64 string"))
-            .expect("pubkey slice");
+        let pubkey =
+            PublicKey::from_slice(&BASE64_STANDARD.decode(pubkey_base64).expect("base64 string"))
+                .expect("pubkey slice");
 
         let p2pkh = Address::p2pkh(&pubkey, Network::Bitcoin);
         assert_eq!(signature.is_signed_by_address(&secp, &p2pkh, msg_hash), Ok(false));