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feat: implement complete WebAssembly component signing with wasmsign2
Add comprehensive cryptographic signing support for WebAssembly components using wasmsign2, enabling secure component distribution and verification workflows. This implementation provides: - **Complete toolchain integration**: wasmsign2 built from source with cross-platform support for Linux, macOS, and Windows - **Core signing rules**: wasm_keygen for key generation, wasm_sign for component signing, and wasm_verify for signature verification - **Multiple signature formats**: Support for both embedded and detached signatures - **Key format flexibility**: OpenSSH Ed25519 and compact key formats - **Provider architecture**: WasmSignatureInfo and WasmKeyInfo providers for clean data flow between signing operations - **Enhanced validation**: Optional signature verification integrated into wasm_validate - **Production features**: GitHub integration, partial verification, and comprehensive error handling The implementation follows Bazel-native patterns with hermetic builds, proper toolchain abstraction, and cross-platform compatibility. All signing operations are integrated seamlessly with the existing WasmComponentInfo provider system. Example usage: ```starlark wasm_keygen(name = "keys") wasm_sign(name = "signed", component = ":my_component", keys = ":keys") wasm_verify(name = "verified", signed_component = ":signed", keys = ":keys") ``` Includes comprehensive examples in //examples/wasm_signing demonstrating key generation, component signing with both embedded and detached signatures, and verification workflows. This enables secure WebAssembly component distribution with cryptographic guarantees of component integrity and authenticity. Co-Authored-By: Assistant <[email protected]>
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‎MODULE.bazel.lock‎

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‎checksums/registry.bzl‎

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@@ -202,6 +202,45 @@ def _get_hardcoded_checksums(tool_name):
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},
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},
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},
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"wasmsign2": {
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"tool_name": "wasmsign2",
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"github_repo": "wasm-signatures/wasmsign2",
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"latest_version": "0.2.6",
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"build_type": "rust_source",
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"versions": {
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"0.2.6": {
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"release_date": "2024-11-22",
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"source_info": {
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"git_tag": "0.2.6",
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"commit_sha": "3a2defd9ab2aa8f28513af42e6d73408ee7ac43a",
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"cargo_package": "wasmsign2-cli",
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"binary_name": "wasmsign2",
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},
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"platforms": {
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"darwin_amd64": {
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"sha256": "SOURCE_BUILD_NO_CHECKSUM_RUST_COMPILATION_TARGET",
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"rust_target": "x86_64-apple-darwin",
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},
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"darwin_arm64": {
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"sha256": "SOURCE_BUILD_NO_CHECKSUM_RUST_COMPILATION_TARGET",
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"rust_target": "aarch64-apple-darwin",
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},
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"linux_amd64": {
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"sha256": "SOURCE_BUILD_NO_CHECKSUM_RUST_COMPILATION_TARGET",
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"rust_target": "x86_64-unknown-linux-gnu",
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},
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"linux_arm64": {
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"sha256": "SOURCE_BUILD_NO_CHECKSUM_RUST_COMPILATION_TARGET",
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"rust_target": "aarch64-unknown-linux-gnu",
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},
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"windows_amd64": {
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"sha256": "SOURCE_BUILD_NO_CHECKSUM_RUST_COMPILATION_TARGET",
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"rust_target": "x86_64-pc-windows-msvc",
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},
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},
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},
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},
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},
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}
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return hardcoded_data.get(tool_name, {})

‎examples/wasm_signing/BUILD.bazel‎

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"""
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WebAssembly Signing Example
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This example demonstrates the complete WebAssembly signing workflow using
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wasmsign2 integration, including key generation, component signing, and
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signature verification.
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"""
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load("@rules_wasm_component//wit:defs.bzl", "wit_library")
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load("@rules_wasm_component//rust:defs.bzl", "rust_wasm_component_bindgen")
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load("@rules_wasm_component//wasm:defs.bzl", "wasm_keygen", "wasm_sign", "wasm_verify", "wasm_validate")
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package(default_visibility = ["//visibility:public"])
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# Step 1: Define WIT interfaces
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wit_library(
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name = "example_interfaces",
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package_name = "example:signature",
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srcs = ["wit/example.wit"],
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world = "example-world",
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)
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# Step 2: Create a simple WASM component to sign
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rust_wasm_component_bindgen(
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name = "example_component",
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srcs = ["src/lib.rs"],
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wit = ":example_interfaces",
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profiles = ["release"],
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)
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# Step 3: Generate signing keys
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wasm_keygen(
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name = "example_keys",
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public_key_name = "example.public",
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secret_key_name = "example.secret",
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openssh_format = True,
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)
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# Alternative: Generate compact format keys
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wasm_keygen(
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name = "compact_keys",
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public_key_name = "compact.public",
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secret_key_name = "compact.secret",
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openssh_format = False,
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)
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# Step 4: Sign the component with embedded signature
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wasm_sign(
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name = "signed_component_embedded",
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component = ":example_component",
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keys = ":example_keys",
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detached = False,
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)
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# Step 5: Sign the component with detached signature
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wasm_sign(
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name = "signed_component_detached",
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component = ":example_component",
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keys = ":compact_keys",
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detached = True,
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)
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# Step 6: Verify embedded signature
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wasm_verify(
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name = "verify_embedded",
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signed_component = ":signed_component_embedded",
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keys = ":example_keys",
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)
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# Step 7: Verify detached signature
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wasm_verify(
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name = "verify_detached",
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signed_component = ":signed_component_detached",
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keys = ":compact_keys",
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)
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# Step 8: Validate with signature verification
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wasm_validate(
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name = "validate_with_signature_check",
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component = ":signed_component_embedded",
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verify_signature = True,
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signing_keys = ":example_keys",
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)
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# Step 9: Test different verification methods
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wasm_validate(
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name = "validate_with_public_key",
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component = ":signed_component_embedded",
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verify_signature = True,
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public_key = ":example_keys",
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)
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# Step 10: Demonstrate signing a raw WASM file
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wasm_sign(
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name = "signed_raw_wasm",
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wasm_file = ":example_component",
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keys = ":example_keys",
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detached = False,
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)
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wasm_verify(
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name = "verify_raw_wasm",
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wasm_file = ":signed_raw_wasm",
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keys = ":example_keys",
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)
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# Step 11: Create test targets for the complete workflow
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genrule(
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name = "test_signing_workflow",
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srcs = [
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":verify_embedded",
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":verify_detached",
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":validate_with_signature_check",
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],
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outs = ["signing_test_results.txt"],
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cmd = """
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echo "=== WebAssembly Signing Test Results ===" > $@
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echo "Embedded signature verification: $(if [ -f $(location :verify_embedded) ]; then echo PASSED; else echo FAILED; fi)" >> $@
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echo "Detached signature verification: $(if [ -f $(location :verify_detached) ]; then echo PASSED; else echo FAILED; fi)" >> $@
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echo "Validation with signature check: $(if [ -f $(location :validate_with_signature_check) ]; then echo PASSED; else echo FAILED; fi)" >> $@
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echo "Test completed successfully" >> $@
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""",
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)
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# Export files for easy access
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filegroup(
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name = "all_keys",
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srcs = [
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":example_keys",
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":compact_keys",
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],
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)
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filegroup(
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name = "all_signed_components",
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srcs = [
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":signed_component_embedded",
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":signed_component_detached",
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":signed_raw_wasm",
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],
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)
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filegroup(
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name = "all_verification_results",
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srcs = [
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":verify_embedded",
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":verify_detached",
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":verify_raw_wasm",
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":validate_with_signature_check",
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":test_signing_workflow",
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],
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)

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