4 files changed, 150 insertions, 1 deletions
diff --git a/src/libkeccak.h b/src/libkeccak.h
index 1dab356..af6bfac 100644
--- a/src/libkeccak.h
+++ b/src/libkeccak.h
@@ -22,6 +22,8 @@
 
 #include "libkeccak/spec.h"
 #include "libkeccak/state.h"
+#include "libkeccak/digest.h"
+#include "libkeccak/hex.h"
 
 
 #undef
diff --git a/src/libkeccak/digest.h b/src/libkeccak/digest.h
new file mode 100644
index 0000000..4853631
--- /dev/null
+++ b/src/libkeccak/digest.h
@@ -0,0 +1,85 @@
+/**
+ * libkeccak – Keccak-family hashing library
+ * 
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBKECCAK_DIGEST_H
+#define LIBKECCAK_DIGEST_H  1
+
+
+#include "state.h"
+
+
+/**
+ * Absorb the more of the message to the Keccak sponge
+ * 
+ * @param  state   The hashing state
+ * @param  msg     The partial message
+ * @param  msglen  The length of the partial message
+ */
+__attribute__((nonnull(1)))
+void libkeccak_update(libkeccak_state_t* restrict state, const char* restrict msg, size_t msglen);
+
+
+/**
+ * Absorb the last part of the message and squeeze the Keccak sponge
+ * 
+ * @param   state    The hashing state
+ * @param   msg      The rest of the message, may be `NULL`
+ * @param   msglen   The length of the partial message
+ * @param   bits     The number of bits at the end of the message not covered by `msglen`
+ * @param   suffix   The suffix concatenate to the message
+ * @param   hashsum  Output paramter for the hashsum, may be `NULL`
+ * @return           Zero on success, -1 on error
+ */
+__attribute__((nonnull(1)))
+int libkeccak_digest(libkeccak_state_t* restrict state, const char* restrict msg, size_t msglen,
+		     size_t bits, const char* restrict suffix, char* restrict hashsum);
+
+
+/**
+ * Force some rounds of Keccak-f
+ * 
+ * @param  state  The hashing state
+ * @param  times  The number of rounds
+ */
+__attribute__((nonnull, nothrow))
+void libkeccak_simple_squeeze(libkeccak_state_t* restrict state, long times);
+
+
+/**
+ * Squeeze as much as is needed to get a digest a number of times
+ * 
+ * @param  state  The hashing state
+ * @param  times  The number of digests
+ */
+__attribute__((nonnull, nothrow))
+void libkeccak_fast_squeeze(libkeccak_state_t* restrict state, long times);
+
+
+/**
+ * Squeeze out another digest
+ * 
+ * @param   state    The hashing state
+ * @param   hashsum  Output paramter for the hashsum
+ * @return           Zero on success, -1 on error
+ */
+__attribute__((nonnull, nothrow))
+int libkeccak_squeeze(libkeccak_state_t* restrict state, char* restrict hashsum);
+
+
+#undef
+
diff --git a/src/libkeccak/hex.h b/src/libkeccak/hex.h
new file mode 100644
index 0000000..5d9470c
--- /dev/null
+++ b/src/libkeccak/hex.h
@@ -0,0 +1,60 @@
+/**
+ * libkeccak – Keccak-family hashing library
+ * 
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBKECCAK_HEX_H
+#define LIBKECCAK_HEX_H  1
+
+
+#include <stddef.h>
+
+
+/**
+ * Convert a binary hashsum to lower case hexadecimal representation
+ * 
+ * @param  output   Output array, should have an allocation size of at least `2 * n + 1`
+ * @param  hashsum  The hashsum to convert
+ * @param  n        The size of `hashsum`
+ */
+__attribute__((leaf, nonnull, nothrow))
+void libkeccak_behex_lower(char* restrict output, const char* restrict hashsum, size_t n);
+
+
+/**
+ * Convert a binary hashsum to upper case hexadecimal representation
+ * 
+ * @param  output   Output array, should have an allocation size of at least `2 * n + 1`
+ * @param  hashsum  The hashsum to convert
+ * @param  n        The size of `hashsum`
+ */
+__attribute__((leaf, nonnull, nothrow))
+void libkeccak_behex_upper(char* restrict output, const char* restrict hashsum, size_t n);
+
+
+/**
+ * Convert a hexadecimal hashsum (both lower case, upper
+ * case and mixed is supported) to binary representation
+ * 
+ * @param  output   Output array, should have an allocation size of at least `strlen(hashsum) / 2`
+ * @param  hashsum  The hashsum to convert
+ */
+__attribute__((leaf, nonnull, nothrow))
+void libkeccak_unhex(char* restrict output, const char* restrict hashsum);
+
+
+#undef
+
diff --git a/src/libkeccak/state.h b/src/libkeccak/state.h
index 5abbb5a..00d8af7 100644
--- a/src/libkeccak/state.h
+++ b/src/libkeccak/state.h
@@ -30,7 +30,9 @@
 
 
 /**
- * This datastructure describes the state of a hashing process
+ * Satastructure that describes the state of a hashing process
+ * 
+ * The `char`-size of the output hashsum is calculated by `(.n + 7) >> 3`
  */
 typedef struct libkeccak_state
 {