add files.o

Signed-off-by: Mattias Andrée <maandree@operamail.com>

3 files changed, 193 insertions, 0 deletions

diff --git a/src/libkeccak.h b/src/libkeccak.h
index cd401c5..fa564c4 100644
--- a/src/libkeccak.h
+++ b/src/libkeccak.h
@@ -25,6 +25,7 @@
 #include "libkeccak/state.h"
 #include "libkeccak/digest.h"
 #include "libkeccak/hex.h"
+#include "libkeccak/files.h"
 
 
 #undef
diff --git a/src/libkeccak/files.c b/src/libkeccak/files.c
new file mode 100644
index 0000000..5374620
--- /dev/null
+++ b/src/libkeccak/files.c
@@ -0,0 +1,68 @@
+/**
+ * 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/>.
+ */
+#include "files.h"
+
+
+#include <stddef.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <alloca.h>
+
+
+/**
+ * Calculate a Keccak-family hashsum of a file
+ * 
+ * @param   fd       The file descriptor of the file to hash
+ * @param   state    The hashing state, should not be initialised (memory leak otherwise)
+ * @param   spec     Specifications for the hashing algorithm
+ * @param   suffix   The data suffix, see `libkeccak_digest`
+ * @param   hashsum  Output array for the hashsum, have an allocation size of
+ *                   at least `(spec->output / 8) * sizeof(char)`, may be `NULL`
+ * @return           Zero on success, -1 on error
+ */
+int libkeccak_generalised_sum_fd(int fd, libkeccak_state_t* restrict state,
+				 const libkeccak_spec_t* restrict spec,
+				 const char* restrict suffix, char* restrict hashsum)
+{
+  ssize_t got;
+  struct stat attr;
+  size_t blksize = 4096;
+  char* chunk;
+  
+  if (libkeccak_state_initialise(state, spec) < 0)
+    return -1;
+  
+  if (fstat(fd, &attr) == 0)
+    if (attr.st_blksize > 0)
+      blksize = attr.st_blksize;
+  
+  chunk = alloca(blksize);
+  
+  for (;;)
+    {
+      got = read(fd, chunk, blksize);
+      if (got < 0)   return -1;
+      if (got == 0)  break;
+      if (libkeccak_update(state, chunk, (size_t)got) < 0)
+	return -1;
+    }
+  
+  return libkeccak_digest(state, NULL, 0, 0, suffix, hashsum);
+}
+
diff --git a/src/libkeccak/files.h b/src/libkeccak/files.h
new file mode 100644
index 0000000..8283c0e
--- /dev/null
+++ b/src/libkeccak/files.h
@@ -0,0 +1,124 @@
+/**
+ * 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_FILES_H
+#define LIBKECCAK_FILES_H  1
+
+
+#include "../libkeccak.h"
+
+
+/**
+ * Calculate a Keccak-family hashsum of a file
+ * 
+ * @param   fd       The file descriptor of the file to hash
+ * @param   state    The hashing state, should not be initialised (memory leak otherwise)
+ * @param   spec     Specifications for the hashing algorithm
+ * @param   suffix   The data suffix, see `libkeccak_digest`
+ * @param   hashsum  Output array for the hashsum, have an allocation size of
+ *                   at least `(spec->output / 8) * sizeof(char)`, may be `NULL`
+ * @return           Zero on success, -1 on error
+ */
+__attribute__((nonnull(2, 3)))
+int libkeccak_generalised_sum_fd(int fd, libkeccak_state_t* restrict state,
+				 const libkeccak_spec_t* restrict spec,
+				 const char* restrict suffix, char* restrict hashsum);
+
+
+/**
+ * Calculate the Keccak hashsum of a file
+ * 
+ * @param   fd       The file descriptor of the file to hash
+ * @param   state    The hashing state, should not be initialised (memory leak otherwise)
+ * @param   spec     Specifications for the hashing algorithm
+ * @param   hashsum  Output array for the hashsum, have an allocation size of
+ *                   at least `(spec->output / 8) * sizeof(char)`, may be `NULL`
+ * @return           Zero on success, -1 on error
+ */
+static inline __attribute__((nonnull(2, 3), artificial, gnu_inline))
+int libkeccak_keccaksum_fd(int fd, libkeccak_state_t* restrict state,
+			   const libkeccak_spec_t* restrict spec, char* restrict hashsum)
+{
+  return libkeccak_generalised_sum_fd(fd, spec, NULL, hashsum);
+}
+
+
+/**
+ * Calculate the SHA3 hashsum of a file
+ * 
+ * @param   fd       The file descriptor of the file to hash
+ * @param   state    The hashing state, should not be initialised (memory leak otherwise)
+ * @param   output   The output size parameter for the hashing algorithm
+ * @param   hashsum  Output array for the hashsum, have an allocation size of
+ *                   at least `(output / 8) * sizeof(char)`, may be `NULL`
+ * @return           Zero on success, -1 on error
+ */
+static inline __attribute__((nonnull(2), artificial, gnu_inline))
+int libkeccak_sha3sum_fd(int fd, libkeccak_state_t* restrict state,
+			 long output, char* restrict hashsum)
+{
+  libkeccak_spec_t spec;
+  libkeccak_spec_sha3(&spec, output);
+  return libkeccak_generalised_sum_fd(fd, &spec, LIBKECCAK_SHA3_SUFFIX, hashsum);
+}
+
+
+/**
+ * Calculate the RawSHAKE hashsum of a file
+ * 
+ * @param   fd            The file descriptor of the file to hash
+ * @param   state         The hashing state, should not be initialised (memory leak otherwise)
+ * @param   semicapacity  The semicapacity parameter for the hashing algorithm
+ * @param   output        The output size parameter for the hashing algorithm
+ * @param   hashsum       Output array for the hashsum, have an allocation size of
+ *                        at least `(output / 8) * sizeof(char)`, may be `NULL`
+ * @return                Zero on success, -1 on error
+ */
+static inline __attribute__((nonnull(2), artificial, gnu_inline))
+int libkeccak_rawshakesum_fd(int fd, libkeccak_state_t* restrict state,
+			     long semicapacity, long output, char* restrict hashsum)
+{
+  libkeccak_spec_t spec;
+  libkeccak_spec_rawshake(&spec, semicapacity, output);
+  return libkeccak_generalised_sum_fd(fd, &spec, LIBKECCAK_RAWSHAKE_SUFFIX, hashsum);
+}
+
+
+/**
+ * Calculate the SHAKE hashsum of a file
+ * 
+ * @param   fd            The file descriptor of the file to hash
+ * @param   state         The hashing state, should not be initialised (memory leak otherwise)
+ * @param   semicapacity  The semicapacity parameter for the hashing algorithm
+ * @param   output        The output size parameter for the hashing algorithm
+ * @param   hashsum       Output array for the hashsum, have an allocation size of
+ *                        at least `(output / 8) * sizeof(char)`, may be `NULL`
+ * @return                Zero on success, -1 on error
+ */
+static inline __attribute__((nonnull(2), artificial, gnu_inline))
+int libkeccak_shakesum_fd(int fd, libkeccak_state_t* restrict state,
+			  long semicapacity, long output, char* restrict hashsum)
+{
+  libkeccak_spec_t spec;
+  libkeccak_spec_shake(&spec, semicapacity, output);
+  return libkeccak_generalised_sum_fd(fd, &spec, LIBKECCAK_SHAKE_SUFFIX, hashsum);
+}
+
+
+#undef
+