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c-kzg-4844
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compute_challenges(): Use a single hash_input array

This commit is contained in:
George Kadianakis 2022-12-02 12:35:46 +02:00
parent bcf14e7662
commit bdfa79ca47
1 changed files with 8 additions and 8 deletions
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16
src/c_kzg_4844.c
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@ -1121,12 +1121,14 @@ static C_KZG_RET compute_challenges(BLSFieldElement *out, BLSFieldElement r_powe
uint8_t hashed_data[32] = {0};
hash(hashed_data, bytes, nb);
/* We will use hash_input in the computation of both challenges */
uint8_t hash_input[33];
/* Compute r */
uint8_t r_bytes[32] = {0};
uint8_t hash_input_0[33] = {0}; // hashed_data + b'\x00'
memcpy(hash_input_0, hashed_data, 32);
hash_input_0[32] = 0x0;
hash(r_bytes, hash_input_0, 33);
memcpy(hash_input, hashed_data, 32);
hash_input[32] = 0x0;
hash(r_bytes, hash_input, 33);
/* Compute r_powers */
BLSFieldElement r;
@ -1135,10 +1137,8 @@ static C_KZG_RET compute_challenges(BLSFieldElement *out, BLSFieldElement r_powe
/* Compute eval_challenge */
uint8_t eval_challenge[32] = {0};
uint8_t hash_input_1[33] = {0}; // hashed_data + b'\x01'
memcpy(hash_input_1, hashed_data, 32);
hash_input_1[32] = 0x1;
hash(eval_challenge, hash_input_1, 33);
hash_input[32] = 0x1;
hash(eval_challenge, hash_input, 33);
bytes_to_bls_field(out, eval_challenge);
free(bytes);