C#.NET BC BouncyCastle 国密 SM2 解密遇到 Invalid point encoding 77

C#.NET BC BouncyCastle 国密 SM2 解密遇到 Invalid point encoding 77

参考：https://blog.csdn.net/seeyouagen/article/details/115727307?spm=1001.2101.3001.6661.1&utm_medium=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1-115727307-blog-122319132.pc_relevant_multi_platform_whitelistv1&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1-115727307-blog-122319132.pc_relevant_multi_platform_whitelistv1&utm_relevant_index=1

使用BC 库解密时，如果密文不是 04 开头，前面要加 04. 否则会报 Invalid point encoding 77

if (!encryptedHexStr.StartsWith("04"))
{
encryptedHexStr = "04" + encryptedHexStr;
}

encryptedHexStr 是16 进制字符串。

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来源： https://www.cnblogs.com/runliuv/p/16544671.html