free NULL cleanup

[openssl.git] / doc / crypto / RSA_sign.pod

diff --git a/doc/crypto/RSA_sign.pod b/doc/crypto/RSA_sign.pod
index 71688a665e13aa746517a49fc579d5325266e91b..fc16b1f4f8061509c5fb2608886010a56bf20a1d 100644 (file)
--- a/doc/crypto/RSA_sign.pod
+++ b/doc/crypto/RSA_sign.pod
@@ -8,10 +8,10 @@ RSA_sign, RSA_verify - RSA signatures
 
  #include <openssl/rsa.h>
 
- int RSA_sign(int type, unsigned char *m, unsigned int m_len,
+ int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
     unsigned char *sigret, unsigned int *siglen, RSA *rsa);
 
- int RSA_verify(int type, unsigned char *m, unsigned int m_len,
+ int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
     unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
 
 =head1 DESCRIPTION
@@ -20,6 +20,10 @@ RSA_sign() signs the message digest B<m> of size B<m_len> using the
 private key B<rsa> as specified in PKCS #1 v2.0. It stores the
 signature in B<sigret> and the signature size in B<siglen>. B<sigret>
 must point to RSA_size(B<rsa>) bytes of memory.
+Note that PKCS #1 adds meta-data, placing limits on the size of the
+key that can be used.
+See L<RSA_private_encrypt(3)|RSA_private_encrypt(3)> for lower-level
+operations.
 
 B<type> denotes the message digest algorithm that was used to generate
 B<m>. It usually is one of B<NID_sha1>, B<NID_ripemd160> and B<NID_md5>;