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Add integrity hash support and SRP tuning options

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Kelsi 2026-02-13 01:32:15 -08:00
parent b3001a4b5b
commit 5435796a98
10 changed files with 591 additions and 22 deletions
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16
src/auth/srp.cpp
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@ -58,6 +58,18 @@ void SRP::feed(const std::vector<uint8_t>& B_bytes,
this->N = BigNum(N_bytes, true);
this->s = BigNum(salt_bytes, true);
if (useHashedK_) {
// k = H(N | g) (SRP-6a style)
std::vector<uint8_t> Ng;
Ng.insert(Ng.end(), N_bytes.begin(), N_bytes.end());
Ng.insert(Ng.end(), g_bytes.begin(), g_bytes.end());
std::vector<uint8_t> k_bytes = Crypto::sha1(Ng);
k = BigNum(k_bytes, !hashBigEndian_);
LOG_DEBUG("Using hashed SRP multiplier k=H(N|g)");
} else {
k = BigNum(K_VALUE);
}
LOG_DEBUG("SRP challenge data loaded");
// Now compute everything in sequence
@ -72,7 +84,7 @@ void SRP::feed(const std::vector<uint8_t>& B_bytes,
x_input.insert(x_input.end(), salt_bytes.begin(), salt_bytes.end());
x_input.insert(x_input.end(), auth_hash.begin(), auth_hash.end());
std::vector<uint8_t> x_bytes = Crypto::sha1(x_input);
x = BigNum(x_bytes, true);
x = BigNum(x_bytes, !hashBigEndian_);
LOG_DEBUG("Computed x (salted password hash)");
// 3. Generate client ephemeral (a, A)
@ -151,7 +163,7 @@ void SRP::computeSessionKey() {
AB.insert(AB.end(), B_bytes_u.begin(), B_bytes_u.end());
std::vector<uint8_t> u_bytes = Crypto::sha1(AB);
u = BigNum(u_bytes, true);
u = BigNum(u_bytes, !hashBigEndian_);
LOG_DEBUG("Scrambler u calculated");