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Have the C++ RNG apply a DST

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This commit is contained in:
Luke Parker 2022-05-22 15:56:12 -04:00
parent 30529038f2
commit 0eb2386ef0
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GPG key ID: F9F1386DB1E119B6
1 changed files with 8 additions and 4 deletions

12
coins/monero/c/wrapper.cpp
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@ -5,11 +5,15 @@
#include "ringct/bulletproofs.h" #include "ringct/bulletproofs.h"
#include "ringct/rctSigs.h" #include "ringct/rctSigs.h"
typedef std::lock_guard<std::mutex> lock;
std::mutex rng_mutex; std::mutex rng_mutex;
char rng_entropy[64];
uint8_t rng_entropy[64];
void rng(uint8_t* seed) { void rng(uint8_t* seed) {
// Set the first half to the seed
memcpy(rng_entropy, seed, 32); memcpy(rng_entropy, seed, 32);
memset(&rng_entropy[32], 0, 32); // Set the second half to the hash of a DST to ensure a lack of collisions
crypto::cn_fast_hash("RNG_entropy_seed", 16, (char*) &rng_entropy[32]);
} }
extern "C" { extern "C" {
@ -41,7 +45,7 @@ extern "C" {
} }
uint8_t* c_generate_bp(uint8_t* seed, uint8_t len, uint64_t* a, uint8_t* m) { uint8_t* c_generate_bp(uint8_t* seed, uint8_t len, uint64_t* a, uint8_t* m) {
std::lock_guard<std::mutex> guard(rng_mutex); lock guard(rng_mutex);
rng(seed); rng(seed);
rct::keyV masks; rct::keyV masks;
@ -70,7 +74,7 @@ extern "C" {
// That's why this must also have control over RNG, to prevent interrupting multisig signing // That's why this must also have control over RNG, to prevent interrupting multisig signing
// while not using known seeds. Considering this doesn't actually define a batch, // while not using known seeds. Considering this doesn't actually define a batch,
// and it's only verifying a single BP, it'd probably be fine, but... // and it's only verifying a single BP, it'd probably be fine, but...
std::lock_guard<std::mutex> guard(rng_mutex); lock guard(rng_mutex);
rng(seed); rng(seed);
rct::Bulletproof bp; rct::Bulletproof bp;