feat(platform-wallet): classic Dash message signing (signMessage) over FFI, JNI, Kotlin, and Swift - #4259

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dashpay:v4.2-devfrom

HashEngineering:feat/kotlin-sdk-sign-message

Commits on Aug 4, 2026

feat(platform-wallet): classic Dash signed-message primitive (sign_message) over FFI

HashEngineering
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claude
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453dbdd
feat(sdk): signMessage exposed through JNI, Kotlin, and Swift

HashEngineering
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claude
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32c9ee7
fix(platform-wallet): refuse non-digest signers, and stop holding the handle guard across the host callback

HashEngineering
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e5e63c0
fix(sdk): reject unpaired surrogates before signing, and correct the length-prefix docs

HashEngineering
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9ff9941
fix(platform-wallet-ffi): malformed message bytes are caller input, not an internal failure

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5b77dfd
docs(platform-wallet): prove why signer key-unavailable cannot reach code 31 from message signing

HashEngineering
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f597866
docs(platform-wallet): MessageSigningFailed doc no longer claims a code-31 promotion the FFI does not perform

HashEngineering
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claude
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09a27ac