...and pave

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

3 files changed, 257 insertions, 0 deletions

diff --git a/src/common.c b/src/common.c
new file mode 100644
index 0000000..a1afe28
--- /dev/null
+++ b/src/common.c
@@ -0,0 +1,183 @@
+/**
+ * sha3sum – SHA-3 (Keccak) checksum calculator
+ * 
+ * Copyright © 2013, 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 "common.h"
+
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+#ifndef STDIN_PATH
+# ifndef DEVDIR
+#  define DEVDIR  "/dev"
+# endif
+# define STDIN_PATH  DEVDIR "/stdin"
+#endif
+
+
+
+#define USER_ERROR(string)  \
+  (fprintf(stderr, "%s: %s.\n", execname, string), 1)
+
+
+
+/**
+ * Print the checksum of a file
+ * 
+ * @param   filename        The file to hash
+ * @param   gspec           Hashing parameters
+ * @param   squeezes        The number of squeezes to perform
+ * @param   suffix          The message suffix
+ * @param   representation  Either of `REPRESENTATION_BINARY`, `REPRESENTATION_UPPER_CASE`
+ *                          and `REPRESENTATION_LOWER_CASE`
+ * @param   verbose         Whether to print the hashing parameters
+ * @param   execname        `argv[0]` from `main`
+ * @return                  Zero on succes, an appropriate exit value on error
+ */
+int print_checksum(const char* restrict filename, libkeccak_generalised_spec_t* restrict gspec,
+		   long squeezes, const char* restrict suffix, int representation, int verbose,
+		   const char* restrict execname)
+{
+  libkeccak_spec_t spec;
+  libkeccak_state_t state;
+  int r, fd;
+  static char* restrict hashsum = NULL;
+  static char* restrict hexsum = NULL;
+  size_t length;
+  
+  if (r = libkeccak_degeneralise_spec(gspec, &spec), r)
+    switch (r)
+      {	
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_NONPOSITIVE:
+	return USER_ERROR("the state size must be positive");
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_TOO_LARGE:
+	return USER_ERROR("the state size is too large, may not exceed 1600");
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_MOD_25:
+	return USER_ERROR("the state size must be a multiple of 25");
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_WORD_NONPOSITIVE:
+	return USER_ERROR("the word size must be positive");
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_WORD_TOO_LARGE:
+	return USER_ERROR("the word size is too large, may not exceed 64");
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_STATE_WORD_INCOHERENCY:
+	return USER_ERROR("the state size must be exactly 25 times the word size");
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_CAPACITY_NONPOSITIVE:
+	return USER_ERROR("the capacity must be positive");
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_CAPACITY_MOD_8:
+	return USER_ERROR("the capacity must be a multiple of 8");
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_BITRATE_NONPOSITIVE:
+	return USER_ERROR("the rate must be positive");
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_BITRATE_MOD_8:
+	return USER_ERROR("the rate must be a multiple of 8");
+      case LIBKECCAK_GENERALISED_SPEC_ERROR_OUTPUT_NONPOSITIVE:
+	return USER_ERROR("the output size must be positive");
+      default:
+	return USER_ERROR("unknown error in algorithm parameters");
+    }
+  
+  if (r = libkeccak_spec_check(&spec), r)
+    switch (r)
+      {
+      case LIBKECCAK_SPEC_ERROR_BITRATE_NONPOSITIVE:
+	return USER_ERROR("the rate size must be positive");
+      case LIBKECCAK_SPEC_ERROR_BITRATE_MOD_8:
+	return USER_ERROR("the rate must be a multiple of 8");
+      case LIBKECCAK_SPEC_ERROR_CAPACITY_NONPOSITIVE:
+	return USER_ERROR("the capacity must be positive");
+      case LIBKECCAK_SPEC_ERROR_CAPACITY_MOD_8:
+	return USER_ERROR("the capacity must be a multiple of 8");
+      case LIBKECCAK_SPEC_ERROR_OUTPUT_NONPOSITIVE:
+	return USER_ERROR("the output size must be positive");
+      case LIBKECCAK_SPEC_ERROR_STATE_TOO_LARGE:
+	return USER_ERROR("the state size is too large, may not exceed 1600");
+      case LIBKECCAK_SPEC_ERROR_STATE_MOD_25:
+	return USER_ERROR("the state size must be a multiple of 25");
+      case LIBKECCAK_SPEC_ERROR_WORD_NON_2_POTENT:
+	return USER_ERROR("the word size must be a power of 2");
+      case LIBKECCAK_SPEC_ERROR_WORD_MOD_8:
+	return USER_ERROR("the word size must be a multiple of 8");
+      default:
+	return USER_ERROR("unknown error in algorithm parameters");
+      }
+  
+  if (verbose)
+    {
+      fprintf(stderr,        "rate: %li\n", gspec->bitrate);
+      fprintf(stderr,    "capacity: %li\n", gspec->capacity);
+      fprintf(stderr, "output size: %li\n", gspec->output);
+      fprintf(stderr,  "state size: %li\n", gspec->state_size);
+      fprintf(stderr,   "word size: %li\n", gspec->word_size);
+      fprintf(stderr,    "squeezes: %li\n", squeezes);
+    }
+  
+  length = (size_t)((spec.output + 7) / 8);
+  
+  if (hashsum == NULL)
+    if (hashsum = malloc(length * sizeof(char)), hashsum == NULL)
+      return perror(execname), 2;
+  
+  if ((hexsum == NULL) && (representation != REPRESENTATION_BINARY))
+    if (hexsum = malloc((length * 2 + 1) * sizeof(char)), hexsum == NULL)
+      return perror(execname), free(hashsum), 2;
+  
+  if (fd = open(strcmp(filename, "-") ? filename : STDIN_PATH, O_RDONLY), fd < 0)
+    return r = (errno != ENOENT), perror(execname), free(hashsum), free(hexsum), r + 1;
+  
+  if (libkeccak_generalised_sum_fd(fd, &state, &spec, suffix, squeezes > 1 ? NULL : hashsum))
+    return perror(execname), close(fd), libkeccak_state_fast_destroy(&state), free(hashsum), free(hexsum), 2;
+  close(fd);
+  
+  if (squeezes > 2)  libkeccak_fast_squeeze(&state, squeezes - 2);
+  if (squeezes > 1)  libkeccak_squeeze(&state, hashsum);
+  libkeccak_state_fast_destroy(&state);
+  
+  if (representation == REPRESENTATION_UPPER_CASE)
+    {
+      libkeccak_behex_upper(hexsum, hashsum, length);
+      printf("%s  %s\n", hexsum, filename);
+    }
+  else if (representation == REPRESENTATION_LOWER_CASE)
+    {
+      libkeccak_behex_lower(hexsum, hashsum, length);
+      printf("%s  %s\n", hexsum, filename);
+    }
+  else
+    {
+      size_t ptr = 0;
+      ssize_t wrote;
+      fflush(stdout);
+      for (;;)
+	{
+	  wrote = write(STDOUT_FILENO, hashsum, length - ptr);
+	  if (wrote <= 0)
+	    return perror(execname), 2;
+	  ptr += (size_t)wrote;
+	}
+    }
+  
+  free(hashsum);
+  free(hexsum);
+  
+  return 0;
+}
+
diff --git a/src/common.h b/src/common.h
new file mode 100644
index 0000000..36582a8
--- /dev/null
+++ b/src/common.h
@@ -0,0 +1,63 @@
+/**
+ * sha3sum – SHA-3 (Keccak) checksum calculator
+ * 
+ * Copyright © 2013, 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 SHA3SUM_COMMON_H
+#define SHA3SUM_COMMON_H 1
+
+
+#include <libkeccak.h>
+
+
+
+/**
+ * Print the checksum in binary
+ */
+#define REPRESENTATION_BINARY  0
+
+/**
+ * Print the checksum in upper case hexadecimal
+ */
+#define REPRESENTATION_UPPER_CASE  1
+
+/**
+ * Print the checksum in lower case hexadecimal
+ */
+#define REPRESENTATION_LOWER_CASE  2
+
+
+
+/**
+ * Print the checksum of a file
+ * 
+ * @param   filename        The file to hash
+ * @param   gspec           Hashing parameters
+ * @param   squeezes        The  number of squeezes to perform
+ * @param   suffix          The message suffix
+ * @param   representation  Either of `REPRESENTATION_BINARY`, `REPRESENTATION_UPPER_CASE`
+ *                          and `REPRESENTATION_LOWER_CASE`
+ * @param   verbose         Whether to print the hashing parameters
+ * @param   execname        `argv[0]` from `main`
+ * @return                  Zero on succes, an appropriate exit value on error
+ */
+int print_checksum(const char* restrict filename, libkeccak_generalised_spec_t* restrict gspec,
+		   long squeezes, const char* restrict suffix, int representation, int verbose,
+		   const char* restrict execname);
+
+
+#endif
+
diff --git a/src/sha3sum.c b/src/keccaksum.c
index ca06c1d..94013e0 100644
--- a/src/sha3sum.c
+++ b/src/keccaksum.c
@@ -16,3 +16,14 @@
  * 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 "common.h"
+
+
+int main(int argc, char* argv[])
+{
+  libkeccak_generalised_spec_t spec;
+  
+  libkeccak_generalised_spec_initialise(&spec);
+  return print_checksum(argv[1], &spec, 1, "", REPRESENTATION_UPPER_CASE, 1, argv[0]);
+}
+