PKCS7带签名的数字信封

结构体和示例说明

p7.pem文本内容示例：

-----BEGIN PKCS7-----
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
-----END PKCS7-----

P7结构体：

typedef struct pkcs7_st
	{
   
	/* The following is non NULL if it contains ASN1 encoding of
	 * this structure */
	unsigned char *asn1;
	long length;

#define PKCS7_S_HEADER	0
#define PKCS7_S_BODY	1
#define PKCS7_S_TAIL	2
	int state; /* used during processing */
	int detached;

	ASN1_OBJECT *type;
	/* content as defined by the type */
	/* all encryption/message digests are applied to the 'contents',
	 * leaving out the 'type' field. */
	union	{
   
		char *ptr;
		/* NID_pkcs7_data */
		ASN1_OCTET_STRING *data;
		/* NID_pkcs7_signed */
		PKCS7_SIGNED *sign;
		/* NID_pkcs7_enveloped */
		PKCS7_ENVELOPE *enveloped;
		/* NID_pkcs7_signedAndEnveloped */
		PKCS7_SIGN_ENVELOPE *signed_and_enveloped;
		/* NID_pkcs7_digest */
		PKCS7_DIGEST *digest;
		/* NID_pkcs7_encrypted */
		PKCS7_ENCRYPT *encrypted;
		/* Anything else */
		ASN1_TYPE *other;
		} d;
	} PKCS7;

带签名的数字信封结构体：

typedef struct