php man page for openssl_pkcs7_verify

OPENSSL_PKCS7_VERIFY(3) 						 1						   OPENSSL_PKCS7_VERIFY(3)

openssl_pkcs7_verify - Verifies the signature of an S/MIME signed message

SYNOPSIS
       mixed openssl_pkcs7_verify (string  $filename, int  $flags, [string  $outfilename], [array  $cainfo], [string  $extracerts], [string  $con-
       tent])

DESCRIPTION
       openssl_pkcs7_verify(3) reads the S/MIME message contained in the given file and examines the digital signature.

PARAMETERS
	      o $filename
		- Path to the message.

	      o $flags
		-$flags can be used to affect how the signature is verified - see PKCS7 constants for more information.

	      o $outfilename
		- If the $outfilename is specified, it should be a string holding the name of a file into which the certificates  of  the  persons
		that signed the messages will be stored in PEM format.

	      o $cainfo
		-  If  the $cainfo is specified, it should hold information about the trusted CA certificates to use in the verification process -
		see certificate verification for more information about this parameter.

	      o $extracerts
		- If the $extracerts is specified, it is the filename of a file containing a bunch of certificates to use as untrusted CAs.

	      o $content
		- You can specify a filename with $content that will be filled	with  the  verified  data,  but  with  the  signature  information
		stripped.

RETURN VALUES
	Returns  TRUE  if the signature is verified, FALSE if it is not correct (the message has been tampered with, or the signing certificate is
       invalid), or -1 on error.

CHANGELOG
       +--------+------------------------------------+
       |Version |				     |
       |	|				     |
       |	|	     Description	     |
       |	|				     |
       +--------+------------------------------------+
       | 5.1.0	|				     |
       |	|				     |
       |	|  The $content parameter was added. |
       |	|				     |
       +--------+------------------------------------+
NOTES
       Note

	       As specified in RFC 2045, lines may not be longer than 76 characters in the $filename parameter.

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