24 lines
811 B
Plaintext
24 lines
811 B
Plaintext
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import "../../../utils/pack/bool/pack128" as pack128;
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import "../../../utils/pack/bool/unpack128" as unpack128;
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import "./512bitPadded" as sha256;
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// A function that takes an array of 4 field elements as inputs, unpacks each of them to 128
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// bits (big endian), concatenates them and applies sha256.
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// It then returns an array of two field elements, each representing 128 bits of the result.
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def main(field[4] preimage) -> field[2] {
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bool[128] a = unpack128(preimage[0]);
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bool[128] b = unpack128(preimage[1]);
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bool[128] c = unpack128(preimage[2]);
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bool[128] d = unpack128(preimage[3]);
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bool[256] lhs = [...a, ...b];
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bool[256] rhs = [...c, ...d];
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bool[256] r = sha256(lhs, rhs);
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field res0 = pack128(r[..128]);
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field res1 = pack128(r[128..]);
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return [res0, res1];
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}
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