Pkcs7Sha1Signature Class

Security handlers may use public-key encryption technology to encrypt a document (or strings and streams within a document). When doing so, specifying one or more lists of recipients, where each list has its own unique access permissions may be done. Only specified recipients shall open the encrypted document or content, unlike the standard security handler, where a password determines access. The permissions defined for public-key security handlers are shown in Table 24 in 7.6.4.2, "Public-Key Encryption Dictionary" (PDF spec.). Public-key security handlers use the industry standard Public Key Cryptographic Standard Number 7 (PKCS#7) binary encoding syntax to encode recipient list, decryption key, and access permission information. The PKCS#7 specification is in Internet RFC 2315, PKCS #7: Cryptographic Message Syntax, Version 1.5 (see the Bibliography in PDF spec.). When encrypting the data, each recipient’s X.509 public key certificate (as described in ITU-T Recommendation X.509; see the Bibliography in PDF spec.) shall be available. When decrypting the data, the conforming reader shall scan the recipient list for which the content is encrypted and shall attempt to find a match with a certificate that belongs to the user. If a match is found, the user requires access to the corresponding private key, which may require authentication, possibly using a password. Once access is obtained, the private key shall be used to decrypt the encrypted data.

public sealed class Pkcs7Sha1Signature : Signature

Public NotInheritable Class Pkcs7Sha1Signature
	Inherits Signature