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Simplify compute_challenge

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Dankrad Feist 2023-02-15 19:48:58 +00:00
parent 48e7be7dd0
commit 078d62e6ff
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1 changed files with 4 additions and 9 deletions
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13
specs/deneb/polynomial-commitments.md
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@ -231,21 +231,16 @@ def compute_challenge(blob: Blob,
commitment: KZGCommitment) -> BLSFieldElement:
"""
Return the Fiat-Shamir challenge required by the rest of the protocol.
The Fiat-Shamir logic works as per the following pseudocode:
"""
# Append the number of polynomials and the degree of each polynomial as a domain separator
num_polynomials = int.to_bytes(1, 8, ENDIANNESS)
degree_poly = int.to_bytes(FIELD_ELEMENTS_PER_BLOB, 8, ENDIANNESS)
data = FIAT_SHAMIR_PROTOCOL_DOMAIN + degree_poly + num_polynomials
# Append the degree of the polynomial as a domain separator
degree_poly = int.to_bytes(FIELD_ELEMENTS_PER_BLOB, 16, ENDIANNESS)
data = FIAT_SHAMIR_PROTOCOL_DOMAIN + degree_poly
# Append each polynomial which is composed by field elements
data += blob
# Append serialized G1 points
data += commitment
# Transcript has been prepared: time to create the challenges
# Transcript has been prepared: time to create the challenge
return hash_to_bls_field(data)
```