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Challenge-response authentication: the client derives a scrypt verifier (RFC 7914, EVP_PBE_scrypt, N=32768, r=8, p=1) and authenticates with HMAC-SHA256(key, nonce), so neither the password nor its hash is transmitted. The stored format becomes "$scrypt$<n>$<r>$<p>$<salt>$<verifier>" and Response_PasswordSalt now carries the cost parameters. Strict servers only accept scrypt verifiers; legacy accounts are migrated after a successful login. Fix #344 for challenge-response servers: a saved profile stores the derived verifier under the password key instead of the plaintext password. The connect dialog loads it without revealing it, autoconnect passes it through, the change-password dialog no longer prefills the old password field with it, and the client only persists the verifier when "Save password" is checked. Took 3 minutes Took 1 minute Took 10 seconds Took 7 minutes
53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
#ifndef PASSWORDHASHER_H
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#define PASSWORDHASHER_H
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#include <QByteArray>
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#include <QObject>
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// scrypt cost parameters used for newly created password verifiers. These match
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// the RFC 7914 recommended parameters for interactive use.
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constexpr int SCRYPT_N = 32768;
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constexpr int SCRYPT_R = 8;
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constexpr int SCRYPT_P = 1;
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constexpr int SCRYPT_SALT_LENGTH = 16;
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constexpr int SCRYPT_VERIFIER_LENGTH = 64;
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enum class PasswordFormat
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{
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None = 0,
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Scrypt
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};
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struct PasswordVerifier
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{
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PasswordFormat format = PasswordFormat::None;
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int n = 0;
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int r = 0;
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int p = 0;
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QByteArray salt;
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QByteArray verifier;
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bool isValid = false;
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};
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class PasswordHasher
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{
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public:
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static QString computeHash(const QString &password, const QString &salt);
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static QString generateRandomSalt(const int len = 16);
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static QString generateActivationToken();
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/** @brief Derive the scrypt verifier for the given password, salt and cost parameters. */
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static QByteArray deriveKey(const QString &password, const QByteArray &salt, int n, int r, int p);
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/** @brief Build a "$scrypt$<n>$<r>$<p>$<salt>$<verifier>" string with a fresh random salt. */
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static QString generatePasswordVerifier(const QString &password);
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/** @brief Parse a stored "$scrypt$..." string into its components. */
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static PasswordVerifier parsePasswordVerifier(const QString &stored);
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/** @brief True if the stored value is not in the scrypt format (legacy salt+hash). */
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static bool isLegacyFormat(const QString &stored);
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/** @brief HMAC-SHA256 of nonce keyed with the password verifier, used for challenge-response logins. */
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static QByteArray computeResponse(const QByteArray &key, const QByteArray &nonce);
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/** @brief Constant-time byte comparison. */
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static bool constantTimeEquals(const QByteArray &a, const QByteArray &b);
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};
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#endif
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