rust: Explicitly return null hash for pre-v5 auth digests
Co-authored-by: Daira Hopwood <daira@jacaranda.org>
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@ -43,9 +43,11 @@ pub extern "C" fn zcash_transaction_digests(
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}
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if let Some(auth_digest_ret) = unsafe { auth_digest_ret.as_mut() } {
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match tx.version() {
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// Pre-NU5 transaction formats don't have auth digests; leave it empty so we
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// don't need to know the correct consensus branch ID for them.
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TxVersion::Sprout(_) | TxVersion::Overwinter | TxVersion::Sapling => (),
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// Pre-NU5 transaction formats don't have authorizing data commitments; when
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// included in the authDataCommitment tree, they use the null hash.
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TxVersion::Sprout(_) | TxVersion::Overwinter | TxVersion::Sapling => {
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*auth_digest_ret = [0; 32]
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}
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_ => auth_digest_ret.copy_from_slice(tx.auth_commitment().as_bytes()),
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}
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}
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