Update RSAPublicKey manual page...

doc/crypto/d2i_RSAPublicKey.pod

@@ -2,7 +2,9 @@
 
 =head1 NAME
 
-d2i_RSAPublicKey, i2d_RSAPublicKey, d2i_RSAPrivateKey, i2d_RSAPrivateKey, i2d_Netscape_RSA, d2i_Netscape_RSA - ...
+d2i_RSAPublicKey, i2d_RSAPublicKey, d2i_RSAPrivateKey, i2d_RSAPrivateKey,
+d2i_RSA_PUBKEY, i2d_RSA_PUBKEY, i2d_Netscape_RSA,
+d2i_Netscape_RSA - RSA public and private key encoding functions.
 
 =head1 SYNOPSIS
 
@@ -12,6 +14,10 @@ d2i_RSAPublicKey, i2d_RSAPublicKey, d2i_RSAPrivateKey, i2d_RSAPrivateKey, i2d_Ne
 
  int i2d_RSAPublicKey(RSA *a, unsigned char **pp);
 
+ RSA * d2i_RSA_PUBKEY(RSA **a, unsigned char **pp, long length);
+
+ int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp);
+
  RSA * d2i_RSAPrivateKey(RSA **a, unsigned char **pp, long length);
 
  int i2d_RSAPrivateKey(RSA *a, unsigned char **pp);
@@ -22,18 +28,39 @@ d2i_RSAPublicKey, i2d_RSAPublicKey, d2i_RSAPrivateKey, i2d_RSAPrivateKey, i2d_Ne
 
 =head1 DESCRIPTION
 
-...
+d2i_RSAPublicKey() and i2d_RSAPublicKey() decode and encode a PKCS#1 RSAPublicKey
+structure.
+
+d2i_RSA_PUKEY() and i2d_RSA_PUKEY() decode and encode an RSA public key using a
+SubjectPublicKeyInfo (certificate public key) structure.
+
+d2i_RSAPrivateKey(), i2d_RSAPrivateKey() decode and encode a PKCS#1 RSAPrivateKey
+structure.
+
+d2i_Netscape_RSA(), i2d_Netscape_RSA() decode and encode an RSA private key in
+NET format.
+
+The usage of all of these functions is similar to the d2i_X509() and
+i2d_X509() described in the L<d2i_X509(3)|d2i_X509(3)> manual page.
+
+=head1 NOTES
+
+The B<RSA> structure passed to the private key encoding functions should have
+all the PKCS#1 private key components present.
 
-=head1 RETURN VALUES
+The data encoded by the private key functions is unencrypted and therefore 
+offers no private key security. 
 
-...
+The NET format functions are present to provide compatibility with certain very
+old software. This format has some severe security weaknesses and should be
+avoided if possible.
 
 =head1 SEE ALSO
 
-...
+L<d2i_X509(3)|d2i_X509(3)>
 
 =head1 HISTORY
 
-...
+TBA
 
 =cut