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/*
* Copyright (C) 2006-2009 Vincent Hanquez <tab@snarc.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; version 2.1 or version 3.0 only.
*
* 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 General Public License for more details.
*
* SHA256 implementation
*/
#include <unistd.h>
#include <fcntl.h>
#include "sha256.h"
static inline int sha256_file(char *filename, sha256_digest *digest)
{
#define BLKSIZE 4096
unsigned char buf[BLKSIZE];
int fd; ssize_t n;
struct sha256_ctx ctx;
fd = open(filename, O_RDONLY);
if (fd == -1)
return 1;
sha256_init(&ctx);
while ((n = read(fd, buf, BLKSIZE)) > 0)
sha256_update(&ctx, buf, n);
if (n == 0)
sha256_finalize(&ctx, digest);
close(fd);
return n < 0;
#undef BLKSIZE
}
/* this part implement the OCaml binding */
#include <caml/mlvalues.h>
#include <caml/memory.h>
#include <caml/alloc.h>
#include <caml/custom.h>
#include <caml/fail.h>
#define GET_CTX_STRUCT(a) ((struct sha256_ctx *) a)
CAMLexport value stub_sha256_init(value unit)
{
CAMLparam1(unit);
CAMLlocal1(result);
result = caml_alloc(sizeof(struct sha256_ctx), Abstract_tag);
sha256_init(GET_CTX_STRUCT(result));
CAMLreturn(result);
}
CAMLprim value stub_sha256_update(value ctx, value data, value ofs, value len)
{
CAMLparam4(ctx, data, ofs, len);
sha256_update(GET_CTX_STRUCT(ctx), (unsigned char *) data
+ Int_val(ofs), Int_val(len));
CAMLreturn(Val_unit);
}
CAMLprim value stub_sha256_finalize(value ctx)
{
CAMLparam1(ctx);
CAMLlocal1(result);
result = caml_alloc(sizeof(sha256_digest), Abstract_tag);
sha256_finalize(GET_CTX_STRUCT(ctx), (sha256_digest *) result);
CAMLreturn(result);
}
CAMLprim value stub_sha256_file(value name)
{
CAMLparam1(name);
CAMLlocal1(result);
result = caml_alloc(sizeof(sha256_digest), Abstract_tag);
if (sha256_file(String_val(name), (sha256_digest *) result))
caml_failwith("file error");
CAMLreturn(result);
}
CAMLprim value stub_sha256_to_bin(value digest)
{
CAMLparam1(digest);
CAMLlocal1(result);
result = caml_alloc_string(32);
sha256_to_bin((sha256_digest *) digest, String_val(result));
CAMLreturn(result);
}
CAMLprim value stub_sha256_to_hex(value digest)
{
CAMLparam1(digest);
CAMLlocal1(result);
result = caml_alloc_string(64);
sha256_to_hex((sha256_digest *) digest, String_val(result));
CAMLreturn(result);
}
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