SMIME_read_CMS：没有内容类型

Question

我想解密并验证已签名和加密的文件。

代码如下所示（签名并加密文件）：

//open file
bio_file_in = BIO_new_file("fileA", "rb");

//signe file to mem
cms = CMS_sign(scert, skey, NULL, bio_file_in, CMS_NOSMIMECAP|CMS_BINARY);
BIO *mem = BIO_new(BIO_s_mem());
SMIME_write_CMS(mem, cms, bio_file_in, CMS_NOSMIMECAP|CMS_BINARY)

//encrypted
en_cms = CMS_encrypt(recips, mem, EVP_aes_128_cbc(), CMS_BINARY);
en_out_bio = BIO_new_file("fileA.cms.en", "wb");

//save file
SMIME_write_CMS(en_out_bio, en_cms, mem, CMS_BINARY)

解密和验证码如下所示：

bio_file_in = BIO_new_file("fileA.cms.en", "rb");
cms_enc = SMIME_read_CMS(bio_file_in, NULL);

BIO *mem = BIO_new(BIO_s_mem());
CMS_decrypt(cms_enc, dec_key, dec_cert, NULL, mem, CMS_BINARY)

cms_ver = SMIME_read_CMS(mem, NULL);
CMS_verify(cms_ver, NULL, ver_st, NULL, out_file_bio, CMS_NOSMIMECAP|CMS_BINARY)

执行以下行时发生错误

cms_ver = SMIME_read_CMS(dec_bio, NULL);

  

错误：0D0D40D1：asn1编码例程：SMIME_read_ASN1：无内容类型

我不知道问题出在哪里以及如何解决问题？