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Use predicate hash in statements instead of the literal predicate

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Resolve #448 

Previously a predicate was 6 elements.  Now it grows to 8 elements; and the hash is 4 elements.

Some parts of the circuit require only require equality checks with the predicate: that works with the predicate hash.  Other parts require inspecting or working with particular elements in the predicate, those need the preimage of the predicate hash.
Both `StatementTarget` and `StatementTmplTarget` have been updated to include the predicate hash and optionally the predicate.  When the predicate is included, constraints are automatically generated for `pred_hash = hash(pred)`.  We only include the predicate when needed.
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Eduard S. 2026-01-19 11:02:11 +01:00 • committed by GitHub
parent 2eb1daeb92
commit 0fca00cc93
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7 changed files with 319 additions and 159 deletions
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6
src/middleware/mod.rs
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@ -809,7 +809,7 @@ impl Params {
}
pub const fn predicate_size() -> usize {
HASH_SIZE + 2
8
}
pub const fn operation_type_size() -> usize {
@ -817,11 +817,11 @@ impl Params {
}
pub fn statement_size(&self) -> usize {
Self::predicate_size() + STATEMENT_ARG_F_LEN * self.max_statement_args
HASH_SIZE + STATEMENT_ARG_F_LEN * self.max_statement_args
}
pub const fn statement_tmpl_size(&self) -> usize {
Self::predicate_size() + self.max_statement_args * Self::statement_tmpl_arg_size()
HASH_SIZE + self.max_statement_args * Self::statement_tmpl_arg_size()
}
pub fn custom_predicate_size(&self) -> usize {