=head1 DESCRIPTION
BIO_f_md() returns the message digest BIO method. This is a filter
-BIO that digests any data passed through it, it is a BIO wrapper
+BIO that digests any data passed through it. It is a BIO wrapper
for the digest routines EVP_DigestInit(), EVP_DigestUpdate()
and EVP_DigestFinal().
must be called to initialize a digest BIO before any data is
passed through it. It is a BIO_ctrl() macro.
-BIO_get_md() places the a pointer to the digest BIOs digest method
-in B<mdp>, it is a BIO_ctrl() macro.
+BIO_get_md() places a pointer to the digest BIOs digest method
+in B<mdp>. It is a BIO_ctrl() macro.
BIO_get_md_ctx() returns the digest BIOs context into B<mdcp>.
BIO_f_md() returns the digest BIO method.
BIO_set_md(), BIO_get_md() and BIO_md_ctx() return 1 for success and
-0 for failure.
+<=0 for failure.
=head1 EXAMPLES