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a = 10; is an example of a unary operation.
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pkcs7_decrypt(3) [redhat man page]

PKCS7_decrypt(3)						      OpenSSL							  PKCS7_decrypt(3)

PKCS7_decrypt - decrypt content from a PKCS#7 envelopedData structure SYNOPSIS
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 recipients certificate, data is a BIO to write the content to and flags is an optional set of flags. NOTES
OpenSSL_add_all_algorithms() (or equivalent) should be called before using this function or errors about unknown algorithms will occur. Although the recipients certificate is not needed to decrypt the data it is needed to locate the appropriate (of possible several) recipi- ents in the PKCS#7 structure. The following flags can be passed in the flags parameter. 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 then an error is returned. RETURN VALUES
PKCS7_decrypt() returns either 1 for success or 0 for failure. The error can be obtained from ERR_get_error(3) 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 cer- tificate from a database. The lack of single pass processing and need to hold all data in memory as mentioned in PKCS7_sign() also applies to PKCS7_verify(). SEE ALSO
ERR_get_error(3), PKCS7_encrypt(3) HISTORY
PKCS7_decrypt() was added to OpenSSL 0.9.5 0.9.7a 2002-10-09 PKCS7_decrypt(3)

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