Add ccm_encrypt_and_tag()
diff --git a/include/polarssl/ccm.h b/include/polarssl/ccm.h
index 24405e4..de29083 100644
--- a/include/polarssl/ccm.h
+++ b/include/polarssl/ccm.h
@@ -64,6 +64,40 @@
*/
void ccm_free( ccm_context *ctx );
+/**
+ * \brief CCM buffer encryption
+ *
+ * \todo Document if input/output buffers can be the same
+ *
+ * \param ctx CCM context
+ * \param length length of the input data in bytes
+ * \param iv nonce (initialization vector)
+ * \param iv_len length of IV in bytes
+ * must be 2, 3, 4, 5, 6, 7 or 8
+ * \param add additional data
+ * \param add_len length of additional data in bytes
+ * must be less than 2^16 - 2^8
+ * \param input buffer holding the input data
+ * \param output buffer for holding the output data
+ * must be at least 'length' bytes wide
+ * \param tag buffer for holding the tag
+ * \param tag_len length of the tag to generate in bytes
+ * must be 4, 6, 8, 10, 14 or 16
+ *
+ * \note The tag is written to a separete buffer. To get the tag
+ * concatenated with the output as in the CCM spec, use
+ * tag = output + length and make sure the output buffer is
+ * at least length + tag_len wide.
+ *
+ * \return 0 if successful
+ */
+int ccm_crypt_and_tag( ccm_context *ctx, size_t length,
+ const unsigned char *iv, size_t iv_len,
+ const unsigned char *add, size_t add_len,
+ const unsigned char *input, unsigned char *output,
+ unsigned char *tag, size_t tag_len );
+
+
#if defined(POLARSSL_SELF_TEST) && defined(POLARSSL_AES_C)
/**
* \brief Checkup routine