diff options
Diffstat (limited to 'mod/hmac.cxx')
| -rw-r--r-- | mod/hmac.cxx | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/mod/hmac.cxx b/mod/hmac.cxx index dc9eca0..83a78bd 100644 --- a/mod/hmac.cxx +++ b/mod/hmac.cxx @@ -14,9 +14,12 @@ compute_hmac (const options::openssl_options& o, { fdpipe errp (fdopen_pipe ()); // stderr pipe. - // To compute an HMAC over stdin with the key "secret": + // To compute an HMAC over stdin with the key <secret>: // - // openssl mac -digest SHA256 -macopt "key:secret" HMAC + // openssl mac -digest SHA256 -macopt "key:<secret>" HMAC + // + // Note that here we assume both output and diagnostics will fit into pipe + // buffers and don't poll both with fdselect(). // openssl os (path ("-"), // Read message from openssl::out. path ("-"), // Write output to openssl::in. @@ -29,13 +32,13 @@ compute_hmac (const options::openssl_options& o, ifdstream err (move (errp.in)); - string h; // The HMAC. + string h; // The HMAC value. try { - // In case of exception, skip and close input after output. + // In case of an exception, skip and close input after output. // // Note: re-open in/out so that they get automatically closed on - // exception. + // an exception. // ifdstream in (os.in.release (), fdstream_mode::skip); ofdstream out (os.out.release ()); @@ -45,7 +48,7 @@ compute_hmac (const options::openssl_options& o, out.write (m.data (), m.size ()); out.close (); - // Read the HMAC from openssl's output. + // Read the HMAC value from openssl's output. // h = in.read_text (); in.close (); |