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c-kzg-4844
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Use blst's generator functions (#340)

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Justin Traglia 2023-08-14 14:01:35 -05:00 committed by GitHub
parent 3ce8f86341
commit 9e68a47f9c
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2 changed files with 7 additions and 31 deletions
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34
src/c_kzg_4844.c
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@ -89,30 +89,6 @@ static const g1_t G1_IDENTITY = {
{0L, 0L, 0L, 0L, 0L, 0L},
{0L, 0L, 0L, 0L, 0L, 0L}};
/** The G1 generator. */
static const g1_t G1_GENERATOR = {
{0x5cb38790fd530c16L, 0x7817fc679976fff5L, 0x154f95c7143ba1c1L,
0xf0ae6acdf3d0e747L, 0xedce6ecc21dbf440L, 0x120177419e0bfb75L},
{0xbaac93d50ce72271L, 0x8c22631a7918fd8eL, 0xdd595f13570725ceL,
0x51ac582950405194L, 0x0e1c8c3fad0059c0L, 0x0bbc3efc5008a26aL},
{0x760900000002fffdL, 0xebf4000bc40c0002L, 0x5f48985753c758baL,
0x77ce585370525745L, 0x5c071a97a256ec6dL, 0x15f65ec3fa80e493L}};
/** The G2 generator. */
static const g2_t G2_GENERATOR = {
{{{0xf5f28fa202940a10L, 0xb3f5fb2687b4961aL, 0xa1a893b53e2ae580L,
0x9894999d1a3caee9L, 0x6f67b7631863366bL, 0x058191924350bcd7L},
{0xa5a9c0759e23f606L, 0xaaa0c59dbccd60c3L, 0x3bb17e18e2867806L,
0x1b1ab6cc8541b367L, 0xc2b6ed0ef2158547L, 0x11922a097360edf3L}}},
{{{0x4c730af860494c4aL, 0x597cfa1f5e369c5aL, 0xe7e6856caa0a635aL,
0xbbefb5e96e0d495fL, 0x07d3a975f0ef25a2L, 0x0083fd8e7e80dae5L},
{0xadc0fc92df64b05dL, 0x18aa270a2b1461dcL, 0x86adac6a3be4eba0L,
0x79495c4ec93da33aL, 0xe7175850a43ccaedL, 0x0b2bc2a163de1bf2L}}},
{{{0x760900000002fffdL, 0xebf4000bc40c0002L, 0x5f48985753c758baL,
0x77ce585370525745L, 0x5c071a97a256ec6dL, 0x15f65ec3fa80e493L},
{0x0000000000000000L, 0x0000000000000000L, 0x0000000000000000L,
0x0000000000000000L, 0x0000000000000000L, 0x0000000000000000L}}}};
/**
* The first 32 roots of unity in the finite field F_r.
* SCALE2_ROOT_OF_UNITY[i] is a 2^i'th root of unity.
@ -979,15 +955,15 @@ static C_KZG_RET verify_kzg_proof_impl(
g1_t y_g1, P_minus_y;
/* Calculate: X_minus_z */
g2_mul(&x_g2, &G2_GENERATOR, z);
g2_mul(&x_g2, blst_p2_generator(), z);
g2_sub(&X_minus_z, &s->g2_values[1], &x_g2);
/* Calculate: P_minus_y */
g1_mul(&y_g1, &G1_GENERATOR, y);
g1_mul(&y_g1, blst_p1_generator(), y);
g1_sub(&P_minus_y, commitment, &y_g1);
/* Verify: P - y = Q * (X - z) */
*ok = pairings_verify(&P_minus_y, &G2_GENERATOR, proof, &X_minus_z);
*ok = pairings_verify(&P_minus_y, blst_p2_generator(), proof, &X_minus_z);
return C_KZG_OK;
}
@ -1348,7 +1324,7 @@ static C_KZG_RET verify_kzg_proof_batch(
for (size_t i = 0; i < n; i++) {
g1_t ys_encrypted;
/* Get [y_i] */
g1_mul(&ys_encrypted, &G1_GENERATOR, &ys_fr[i]);
g1_mul(&ys_encrypted, blst_p1_generator(), &ys_fr[i]);
/* Get C_i - [y_i] */
g1_sub(&C_minus_y[i], &commitments_g1[i], &ys_encrypted);
/* Get r^i * z_i */
@ -1364,7 +1340,7 @@ static C_KZG_RET verify_kzg_proof_batch(
/* Do the pairing check! */
*ok = pairings_verify(
&proof_lincomb, &s->g2_values[1], &rhs_g1, &G2_GENERATOR
&proof_lincomb, &s->g2_values[1], &rhs_g1, blst_p2_generator()
);
out:

4
src/test_c_kzg_4844.c
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@ -1292,7 +1292,7 @@ static void test_compute_and_verify_kzg_proof__fails_incorrect_proof(void) {
/* Change the proof so it should not verify */
ret = bytes_to_kzg_commitment(&proof_g1, &proof);
ASSERT_EQUALS(ret, C_KZG_OK);
blst_p1_add(&proof_g1, &proof_g1, &G1_GENERATOR);
blst_p1_add(&proof_g1, &proof_g1, blst_p1_generator());
bytes_from_g1(&proof, &proof_g1);
/* Finally verify the proof */
@ -1428,7 +1428,7 @@ static void test_compute_and_verify_blob_kzg_proof__fails_incorrect_proof(void
/* Change the proof so it should not verify */
ret = bytes_to_kzg_commitment(&proof_g1, &proof);
ASSERT_EQUALS(ret, C_KZG_OK);
blst_p1_add(&proof_g1, &proof_g1, &G1_GENERATOR);
blst_p1_add(&proof_g1, &proof_g1, blst_p1_generator());
bytes_from_g1(&proof, &proof_g1);
/* Finally verify the proof */