feat: jwt_generate, jwt_validate, password_hash, password_verify
Fase 2 del issue 0010 — auth core: - jwt_generate/validate: HS256 manual con crypto/hmac + crypto/sha256 - password_hash/verify: wrappers de golang.org/x/crypto/bcrypt (cost 12 default) - JWT rechaza alg != HS256 para mitigar ataque 'alg=none' - hmac.Equal para comparacion constant-time de firmas
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package infra
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import "golang.org/x/crypto/bcrypt"
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// PasswordVerify compara un password en texto plano contra un hash bcrypt.
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// Retorna nil si hacen match, error si no.
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func PasswordVerify(password string, hash string) error {
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return bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
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}
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