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fix(crypto): SHA256 认证默认使用 JDBC 兼容的 2048 迭代数 - #28
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GaussDB authType=10 的 SHA256 认证中，服务器即使报文携带 iteration=10000，实际仍以 2048 次迭代校验 proof；官方 JDBC 驱动对协议 3.0/3.50 客户端硬编码 2048（ConnectionFactoryImpl.server_iteration_350）。旧实现无条件信任报文值，导致 ClientProof 计算错误，登录被拒（28P01 用户名或密码不合法），而相同密码经 JDBC 可正常登录。 新增 sha256Iterations 连接参数：默认 2048 对齐 JDBC；设为 'server' 时信任报文值（等价 JDBC 3.51 行为）；支持连接串与 GAUSSSHA256ITERATIONS 环境变量，非法取值抛 RangeError。补充单元测试覆盖默认值、'server' 模式、自定义值、边界校验及参数传递链路。
fix(crypto): SHA256 认证默认使用 JDBC 兼容的 2048 迭代数
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fix(crypto): SHA256 认证默认使用 JDBC 兼容的 2048 迭代数