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Add bounds checking to field element setters

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This commit is contained in:
Pieter Wuille
2014-11-24 12:38:05 +01:00
parent bb2cd94e09
commit d907ebc0e3
10 changed files with 37 additions and 24 deletions
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src/ecdsa_impl.h
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@@ -108,7 +108,7 @@ static int secp256k1_ecdsa_sig_recover(const secp256k1_ecdsa_sig_t *sig, secp256
secp256k1_num_get_bin(brx, 32, &rx);
secp256k1_num_free(&rx);
secp256k1_fe_t fx;
secp256k1_fe_set_b32(&fx, brx);
VERIFY_CHECK(secp256k1_fe_set_b32(&fx, brx)); /* Either rx < n (and n < p), or rx + n < p (checked above). */
secp256k1_ge_t x;
if (!secp256k1_ge_set_xo(&x, &fx, recid & 1))
return 0;