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IOSC: Implement VerifyPublicKeySign for ECC

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This commit is contained in:
Léo Lam
2018-05-15 18:01:28 +02:00
parent b86f1ea7b3
commit cec7fded60
4 changed files with 70 additions and 4 deletions
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6
Source/Core/Common/Crypto/ec.cpp
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@ -278,8 +278,10 @@ std::array<u8, 60> Sign(const u8* key, const u8* hash)
return signature;
}
UNUSED static int check_ecdsa(u8* Q, u8* R, u8* S, const u8* hash)
bool VerifySignature(const u8* public_key, const u8* signature, const u8* hash)
{
const u8* R = signature;
const u8* S = signature + 30;
u8 Sinv[30];
bn_inv(Sinv, S, ec_N, 30);
@ -290,7 +292,7 @@ UNUSED static int check_ecdsa(u8* Q, u8* R, u8* S, const u8* hash)
bn_mul(w1, e, Sinv, ec_N, 30);
bn_mul(w2, R, Sinv, ec_N, 30);
Point r1 = w1 * ec_G + w2 * Point{Q};
Point r1 = w1 * ec_G + w2 * Point{public_key};
auto& rx = r1.X().data;
if (bn_compare(rx.data(), ec_N, 30) >= 0)
bn_sub_modulus(rx.data(), ec_N, 30);

7
Source/Core/Common/Crypto/ec.h
View File

@ -13,6 +13,13 @@ namespace Common::ec
/// Generate a signature using ECDSA.
std::array<u8, 60> Sign(const u8* key, const u8* hash);
/// Check a signature using ECDSA.
///
/// @param public_key 30 byte ECC public key
/// @param signature 60 byte signature
/// @param hash Message hash
bool VerifySignature(const u8* public_key, const u8* signature, const u8* hash);
/// Compute a shared secret from a private key (30 bytes) and public key (60 bytes).
std::array<u8, 60> ComputeSharedSecret(const u8* private_key, const u8* public_key);