void sha256_get(uint8_t hash[32], const uint8_t *message, int length);/*此函数用于对消息计算摘要值,输入任意大小消息,输出32字节摘要值*/
void hmac_sha256_get(uint8_t digest[32], uint8_t *message, int message_length, uint8_t *key, int key_length);/*此函数用于HMAC_SHA256加密,秘钥任意长度,输出32字节*/
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