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https://github.com/trezor/trezor-firmware.git
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normalize y^2 in pubkey validation
fix last commit
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parent
b9d5896174
commit
0fe1857513
7
ecdsa.c
7
ecdsa.c
@ -459,7 +459,7 @@ int ecdsa_read_pubkey(const uint8_t *pub_key, curve_point *pub)
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if (pub_key[0] == 0x04) {
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bn_read_be(pub_key + 1, &(pub->x));
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bn_read_be(pub_key + 33, &(pub->y));
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#ifdef USE_PUBKEY_VALIDATE
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#if USE_PUBKEY_VALIDATE
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return ecdsa_validate_pubkey(pub);
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#else
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return 1;
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@ -468,7 +468,7 @@ int ecdsa_read_pubkey(const uint8_t *pub_key, curve_point *pub)
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if (pub_key[0] == 0x02 || pub_key[0] == 0x03) { // compute missing y coords
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bn_read_be(pub_key + 1, &(pub->x));
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uncompress_coords(pub_key[0], &(pub->x), &(pub->y));
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#ifdef USE_PUBKEY_VALIDATE
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#if USE_PUBKEY_VALIDATE
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return ecdsa_validate_pubkey(pub);
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#else
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return 1;
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@ -502,6 +502,8 @@ int ecdsa_validate_pubkey(const curve_point *pub)
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// y^2
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bn_multiply(&(pub->y), &y_2, &prime256k1);
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bn_mod(&y_2, &prime256k1);
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// x^3 + b
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bn_multiply(&(pub->x), &x_3_b, &prime256k1);
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bn_multiply(&(pub->x), &x_3_b, &prime256k1);
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@ -542,7 +544,6 @@ int ecdsa_verify_double(const uint8_t *pub_key, const uint8_t *sig, const uint8_
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}
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// returns 0 if verification succeeded
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// it is assumed that public key is valid otherwise calling this does not make much sense
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int ecdsa_verify_digest(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *digest)
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{
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int i, j;
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2
tests.c
2
tests.c
@ -887,7 +887,7 @@ START_TEST(test_pubkey_validity)
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res = ecdsa_read_pubkey(pub_key, &pub);
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ck_assert_int_eq(res, 1);
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#ifdef USE_PUBKEY_VALIDATE
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#if USE_PUBKEY_VALIDATE
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memcpy(pub_key, fromhex("04f80490839af36d13701ec3f9eebdac901b51c362119d74553a3c537faff31b17e2a59ebddbdac9e87b816307a7ed5b826b8f40b92719086238e1bebf00000000"), 65);
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res = ecdsa_read_pubkey(pub_key, &pub);
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ck_assert_int_eq(res, 0);
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