watermark_codec_pkg/tests/sign_verify.py

import ctypes

def get_sign(raw_data: str) -> (str, str):
    """
    获取签名值
    :param raw_data: 原文字符串
    :return: tuple(str,str):(签名值base64字符串，公钥base64字符串)
    """
    # 加载共享库
    lib = ctypes.CDLL('libgmsign.so')

    # 定义函数的参数和返回类型
    # 签名函数签名如下：
    # int sign(char *key_value, char *hash_value, char *public_key)
    lib.sign.argtypes = [ctypes.c_char_p, ctypes.c_char_p, ctypes.c_char_p]
    lib.sign.restype = ctypes.c_int

    key_value = raw_data.replace(" ", "").encode('utf-8')
    hash_value = ctypes.create_string_buffer(256)  # 设置签名值输出缓冲区大小为 256 字节
    public_key = ctypes.create_string_buffer(256)  # 设置公钥输出缓冲区大小为 256 字节

    result = lib.sign(key_value, hash_value, public_key)

    if result == 0:
        return hash_value.value.decode(), public_key.value.decode()
    else:
        return None, None


def verify_sign(raw_data: str, sign_data: str, public_key: str) -> bool:
    """
    验证签名
    :param raw_data: 原文字符串
    :param sign_data: 签名值base64字符串
    :param public_key: 公钥base64字符串
    :return:
    """
    # 加载共享库
    lib = ctypes.CDLL('libgmsign.so')
    # 验签函数签名如下：
    # int sign_verify(char *content, char *sign_value, char *public_key)
    lib.sign_verify.argtypes = [ctypes.c_char_p, ctypes.c_char_p, ctypes.c_char_p]
    lib.sign_verify.restype = ctypes.c_int

    content = raw_data.replace(" ", "").encode('utf-8')
    sign_value = sign_data.encode('utf-8')
    public_key = public_key.encode('utf-8')
    verify_result = lib.sign_verify(content, sign_value, public_key)
    verify_result = True if verify_result == 1 else False
    return verify_result


if __name__ == '__main__':
    raw_data = "hello world test sign"
    sign_data, public_key = get_sign(raw_data)
    print(f"sign_data: {sign_data}\npublic_key: {public_key}")
    verify_result = verify_sign(raw_data, sign_data, public_key)
    print(f"verify_result: {verify_result}")