(async-)signature: MSRV 1.60 (#1387)

To simplify the workspace, which contains weak/namespaced features, this
bumps both `async-signature` and `signature` to MSRV 1.60.

So as for the bump to have some justification, it adds weak feature
activation for `rand_core?/std`, and uses this impl to write a
`From<rand_core::Error>` conversion which can preserve the original
error as the boxed source.

.github/workflows/async-signature.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.56.0 # MSRV
+          - 1.60.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4

.github/workflows/signature.yml

@@ -23,7 +23,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.56.0 # MSRV
+          - 1.60.0 # MSRV
           - stable
         target:
           - thumbv7em-none-eabi
@@ -51,7 +51,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.56.0 # MSRV
+          - 1.60.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
@@ -69,7 +69,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.56.0 # MSRV
+          - 1.60.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4

Cargo.toml

@@ -9,12 +9,9 @@ members = [
     "elliptic-curve",
     "kem",
     "password-hash",
-    "universal-hash",
-]
-# TODO: re-add to `members` when MSRV has been bumped to 1.60+
-exclude = [
     "signature",
     "signature/async",
+    "universal-hash",
 ]
 
 [patch.crates-io]

crypto/Cargo.toml

@@ -21,7 +21,7 @@ cipher = { version = "0.4", optional = true }
 digest = { version = "0.10", optional = true, features = ["mac"] }
 elliptic-curve = { version = "0.13", optional = true, path = "../elliptic-curve" }
 password-hash = { version = "0.5", optional = true, path = "../password-hash" }
-signature = { version = "2", optional = true, default-features = false, path = "../signature" }
+signature = { version = "2", optional = true, default-features = false }
 universal-hash = { version = "0.5", optional = true }
 
 [features]

signature/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name          = "signature"
 description   = "Traits for cryptographic signature algorithms (e.g. ECDSA, Ed25519)"
-version       = "2.1.0"
+version       = "2.2.0-pre"
 authors       = ["RustCrypto Developers"]
 license       = "Apache-2.0 OR MIT"
 documentation = "https://docs.rs/signature"
@@ -10,7 +10,7 @@ readme        = "README.md"
 keywords      = ["crypto", "ecdsa", "ed25519", "signature", "signing"]
 categories    = ["cryptography", "no-std"]
 edition       = "2021"
-rust-version  = "1.56"
+rust-version  = "1.60"
 
 [dependencies]
 derive = { package = "signature_derive", version = "2", optional = true, path = "derive" }
@@ -23,12 +23,8 @@ sha2 = { version = "0.10", default-features = false }
 
 [features]
 alloc = []
-std = ["alloc"]
+std = ["alloc", "rand_core?/std"]
 
 [package.metadata.docs.rs]
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
-
-# TODO(tarcieri): remove when these crates are added to toplevel `members`
-[workspace]
-members = [".", "async"]

signature/README.md

@@ -17,7 +17,7 @@ the [RustCrypto] organization, as well as [`ed25519-dalek`].
 
 ## Minimum Supported Rust Version
 
-Rust **1.56** or higher.
+Rust **1.60** or higher.
 
 Minimum supported Rust version can be changed in the future, but it will be
 done with a minor version bump.
@@ -56,7 +56,7 @@ dual licensed as above, without any additional terms or conditions.
 [build-image]: https://github.com/RustCrypto/traits/actions/workflows/signature.yml/badge.svg
 [build-link]: https://github.com/RustCrypto/traits/actions/workflows/signature.yml
 [license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
-[rustc-image]: https://img.shields.io/badge/rustc-1.56+-blue.svg
+[rustc-image]: https://img.shields.io/badge/rustc-1.60+-blue.svg
 [chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
 [chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/260048-signatures
 

signature/async/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name          = "async-signature"
 description   = "Traits for cryptographic signature algorithms (e.g. ECDSA, Ed25519)"
-version       = "0.3.0"
+version       = "0.4.0-pre"
 authors       = ["RustCrypto Developers"]
 license       = "Apache-2.0 OR MIT"
 documentation = "https://docs.rs/async-signature"
@@ -10,11 +10,11 @@ readme        = "README.md"
 keywords      = ["crypto", "ecdsa", "ed25519", "signature", "signing"]
 categories    = ["cryptography", "no-std"]
 edition       = "2021"
-rust-version  = "1.56"
+rust-version  = "1.60"
 
 [dependencies]
 async-trait = "0.1.9"
-signature = { version = "2.0, <2.2", path = ".." }
+signature = { version = "=2.2.0-pre", path = ".." }
 
 [features]
 digest = ["signature/digest"]