PKCS7_DECRYPT(3)           Library Functions Manual           PKCS7_DECRYPT(3)

NAME
     PKCS7_decrypt - decrypt content from a PKCS#7 envelopedData structure

SYNOPSIS
     #include <openssl/pkcs7.h>

     int
     PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data,
         int flags);

DESCRIPTION
     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.

     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.

     If the PKCS7_TEXT 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 returned.

RETURN VALUES
     PKCS7_decrypt() returns 1 for success or 0 for failure.

     The error can be obtained from ERR_get_error(3).

SEE ALSO
     PKCS7_encrypt(3), PKCS7_new(3), PKCS7_verify(3)

HISTORY
     PKCS7_decrypt() first appeared in OpenSSL 0.9.5 and has been available
     since OpenBSD 2.7.

BUGS
     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 to PKCS7_decrypt().

Linux 6.8.7-arch1-1              June 10, 2019             Linux 6.8.7-arch1-1