|PKCS7_DECRYPT(3)||Library Functions Manual||PKCS7_DECRYPT(3)|
*p7, EVP_PKEY *pkey,
X509 *cert, BIO
*data, int flags);
PKCS7_decrypt() extracts and decrypts the content from a PKCS#7 envelopedData structure. pkey is the private key of the recipient, cert is the recipient's certificate, data is a BIO to write the content to and flags is an optional set of flags.
OpenSSL_add_all_algorithms(3) (or equivalent) should be called before using this function or errors about unknown algorithms will occur.
Although the recipient's certificate is not needed to decrypt the data, it is needed to locate the appropriate recipients in the PKCS#7 structure.
flag is set, MIME headers for type
text/plain are deleted from the content. If the
content is not of type text/plain, an error is
PKCS7_decrypt() returns 1 for success or 0 for failure.
The error can be obtained from ERR_get_error(3).ERR_get_error(3), PKCS7_encrypt(3), PKCS7_new(3)
PKCS7_decrypt() first appeared in OpenSSL 0.9.5 and has been available since OpenBSD 2.7.
PKCS7_decrypt() must be passed the correct recipient key and certificate. It would be better if it could look up the correct key and certificate from a database.
The lack of single pass processing and need to hold all data in
memory as mentioned in
PKCS7_sign(3) also applies
|March 22, 2018||OpenBSD-current|