signers implemented with HMAC now support NULL output parameters

[strongswan.git] / src / libstrongswan / crypto / signers / signer.h

diff --git a/src/libstrongswan/crypto/signers/signer.h b/src/libstrongswan/crypto/signers/signer.h
index 0f37097..4218e41 100644 (file)
--- a/src/libstrongswan/crypto/signers/signer.h
+++ b/src/libstrongswan/crypto/signers/signer.h
@@ -74,6 +74,9 @@ extern enum_name_t *integrity_algorithm_names;
 struct signer_t {
        /**
         * @brief Generate a signature.
+        *
+        * If buffer is NULL, data is processed and prepended to a next call until
+        * buffer is a valid pointer.
         * 
         * @param this                  calling object
         * @param data                  a chunk containing the data to sign
@@ -83,6 +86,9 @@ struct signer_t {
        
        /**
         * @brief Generate a signature and allocate space for it.
+        *
+        * If chunk is NULL, data is processed and prepended to a next call until
+        * chunk is a valid chunk pointer.
         * 
         * @param this                  calling object
         * @param data                  a chunk containing the data to sign