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/************************************************
digest.c -
$Author$
created at: Fri May 25 08:57:27 JST 2001
Copyright (C) 1995-2001 Yukihiro Matsumoto
Copyright (C) 2001-2006 Akinori MUSHA
$RoughId: digest.c,v 1.16 2001/07/13 15:38:27 knu Exp $
$Id$
************************************************/
#include "digest.h"
static VALUE mDigest, cDigest_Base;
static ID id_metadata, id_new, id_initialize, id_update, id_digest;
/*
* Digest::Base
*/
static algo_t *
get_digest_base_metadata(VALUE klass)
{
VALUE obj;
algo_t *algo;
if (rb_ivar_defined(klass, id_metadata) == Qfalse) {
return NULL;
}
obj = rb_ivar_get(klass, id_metadata);
Data_Get_Struct(obj, algo_t, algo);
return algo;
}
static VALUE
hexdigest_str_new(VALUE str_digest)
{
char *digest;
size_t digest_len;
int i;
VALUE str;
char *p;
static const char hex[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f'
};
StringValue(str_digest);
digest = RSTRING_PTR(str_digest);
digest_len = RSTRING_LEN(str_digest);
if (LONG_MAX / 2 < digest_len) {
rb_raise(rb_eRuntimeError, "digest string too long");
}
str = rb_str_new(0, digest_len * 2);
for (i = 0, p = RSTRING_PTR(str); i < digest_len; i++) {
unsigned char byte = digest[i];
p[i + i] = hex[byte >> 4];
p[i + i + 1] = hex[byte & 0x0f];
}
return str;
}
static VALUE
rb_digest_base_alloc(VALUE klass)
{
algo_t *algo;
VALUE obj;
void *pctx;
if (klass == cDigest_Base) {
rb_raise(rb_eNotImpError, "Digest::Base is an abstract class");
}
algo = get_digest_base_metadata(klass);
if (algo == NULL) {
return Data_Wrap_Struct(klass, 0, free, 0);
}
pctx = xmalloc(algo->ctx_size);
algo->init_func(pctx);
obj = Data_Wrap_Struct(klass, 0, free, pctx);
return obj;
}
static VALUE
rb_digest_base_s_digest(VALUE klass, VALUE str)
{
algo_t *algo = get_digest_base_metadata(klass);
void *pctx;
volatile VALUE obj;
if (algo == NULL) {
VALUE obj = rb_funcall(klass, id_new, 0);
rb_funcall(obj, id_update, 1, str);
return rb_funcall(obj, id_digest, 0);
}
obj = rb_digest_base_alloc(klass);
Data_Get_Struct(obj, void, pctx);
StringValue(str);
algo->update_func(pctx, RSTRING_PTR(str), RSTRING_LEN(str));
str = rb_str_new(0, algo->digest_len);
algo->finish_func(pctx, RSTRING_PTR(str));
return str;
}
static VALUE
rb_digest_base_s_hexdigest(VALUE klass, VALUE str)
{
return hexdigest_str_new(rb_funcall(klass, id_digest, 1, str));
}
static VALUE
rb_digest_base_copy(VALUE copy, VALUE obj)
{
algo_t *algo;
void *pctx1, *pctx2;
if (copy == obj) return copy;
rb_check_frozen(copy);
algo = get_digest_base_metadata(rb_obj_class(copy));
if (algo == NULL) {
/* initialize_copy() is undefined or something */
rb_notimplement();
}
/* get_digest_base_metadata() may return a NULL */
if (algo != get_digest_base_metadata(rb_obj_class(obj))) {
rb_raise(rb_eTypeError, "wrong argument class");
}
Data_Get_Struct(obj, void, pctx1);
Data_Get_Struct(copy, void, pctx2);
memcpy(pctx2, pctx1, algo->ctx_size);
return copy;
}
static VALUE
rb_digest_base_reset(VALUE self)
{
algo_t *algo;
void *pctx;
algo = get_digest_base_metadata(rb_obj_class(self));
if (algo == NULL) {
rb_funcall(self, id_initialize, 0);
return self;
}
Data_Get_Struct(self, void, pctx);
memset(pctx, 0, algo->ctx_size);
algo->init_func(pctx);
return self;
}
static VALUE
rb_digest_base_update(VALUE self, VALUE str)
{
algo_t *algo;
void *pctx;
algo = get_digest_base_metadata(rb_obj_class(self));
if (algo == NULL) {
/* subclasses must define update() */
rb_notimplement();
}
Data_Get_Struct(self, void, pctx);
StringValue(str);
algo->update_func(pctx, RSTRING_PTR(str), RSTRING_LEN(str));
return self;
}
static VALUE
rb_digest_base_lshift(VALUE self, VALUE str)
{
algo_t *algo;
void *pctx;
algo = get_digest_base_metadata(rb_obj_class(self));
if (algo == NULL) {
/* subclasses just need to define update(), not << */
rb_funcall(self, id_update, 1, str);
return self;
}
Data_Get_Struct(self, void, pctx);
StringValue(str);
algo->update_func(pctx, RSTRING_PTR(str), RSTRING_LEN(str));
return self;
}
static VALUE
rb_digest_base_init(int argc, VALUE *argv, VALUE self)
{
VALUE arg;
rb_scan_args(argc, argv, "01", &arg);
if (!NIL_P(arg)) rb_digest_base_update(self, arg);
return self;
}
static VALUE
rb_digest_base_digest(VALUE self)
{
algo_t *algo;
void *pctx1, *pctx2;
size_t ctx_size;
VALUE str;
algo = get_digest_base_metadata(rb_obj_class(self));
if (algo == NULL) {
/* subclasses must define update() */
rb_notimplement();
}
Data_Get_Struct(self, void, pctx1);
ctx_size = algo->ctx_size;
pctx2 = xmalloc(ctx_size);
memcpy(pctx2, pctx1, ctx_size);
str = rb_str_new(0, algo->digest_len);
algo->finish_func(pctx2, RSTRING_PTR(str));
free(pctx2);
return str;
}
static VALUE
rb_digest_base_hexdigest(VALUE self)
{
return hexdigest_str_new(rb_funcall(self, id_digest, 0));
}
static VALUE
rb_digest_base_inspect(VALUE self)
{
algo_t *algo;
VALUE klass, str;
size_t digest_len = 32; /* no need to be just the right size */
char *cname;
klass = rb_obj_class(self);
algo = get_digest_base_metadata(klass);
if (algo != NULL)
digest_len = algo->digest_len;
cname = rb_obj_classname(self);
/* #<Digest::Alg: xxxxx...xxxx> */
str = rb_str_buf_new(2 + strlen(cname) + 2 + digest_len * 2 + 1);
rb_str_buf_cat2(str, "#<");
rb_str_buf_cat2(str, cname);
rb_str_buf_cat2(str, ": ");
rb_str_buf_append(str, rb_digest_base_hexdigest(self));
rb_str_buf_cat2(str, ">");
return str;
}
static VALUE
rb_digest_base_equal(VALUE self, VALUE other)
{
algo_t *algo;
VALUE klass;
VALUE str1, str2;
klass = rb_obj_class(self);
if (rb_obj_class(other) == klass) {
str1 = rb_funcall(self, id_digest, 0);
str2 = rb_funcall(other, id_digest, 0);
} else {
StringValue(other);
str2 = other;
algo = get_digest_base_metadata(klass);
if (RSTRING_LEN(str2) == algo->digest_len)
str1 = rb_funcall(self, id_digest, 0);
else
str1 = rb_digest_base_hexdigest(self);
}
if (RSTRING_LEN(str1) == RSTRING_LEN(str2)
&& rb_str_cmp(str1, str2) == 0)
return Qtrue;
return Qfalse;
}
/*
* This module provides an interface to the following hash algorithms:
*
* - the MD5 Message-Digest Algorithm by the RSA Data Security,
* Inc., described in RFC 1321
*
* - the SHA-1 Secure Hash Algorithm by NIST (the US' National
* Institute of Standards and Technology), described in FIPS PUB
* 180-1.
*
* - the SHA-256/384/512 Secure Hash Algorithm by NIST (the US'
* National Institute of Standards and Technology), described in
* FIPS PUB 180-2.
*
* - the RIPEMD-160 cryptographic hash function, designed by Hans
* Dobbertin, Antoon Bosselaers, and Bart Preneel.
*/
void
Init_digest(void)
{
mDigest = rb_define_module("Digest");
cDigest_Base = rb_define_class_under(mDigest, "Base", rb_cObject);
rb_define_alloc_func(cDigest_Base, rb_digest_base_alloc);
rb_define_singleton_method(cDigest_Base, "digest", rb_digest_base_s_digest, 1);
rb_define_singleton_method(cDigest_Base, "hexdigest", rb_digest_base_s_hexdigest, 1);
rb_define_method(cDigest_Base, "initialize", rb_digest_base_init, -1);
rb_define_method(cDigest_Base, "initialize_copy", rb_digest_base_copy, 1);
rb_define_method(cDigest_Base, "reset", rb_digest_base_reset, 0);
rb_define_method(cDigest_Base, "update", rb_digest_base_update, 1);
rb_define_method(cDigest_Base, "<<", rb_digest_base_lshift, 1);
rb_define_method(cDigest_Base, "digest", rb_digest_base_digest, 0);
rb_define_method(cDigest_Base, "hexdigest", rb_digest_base_hexdigest, 0);
rb_define_method(cDigest_Base, "to_s", rb_digest_base_hexdigest, 0);
rb_define_method(cDigest_Base, "inspect", rb_digest_base_inspect, 0);
rb_define_method(cDigest_Base, "==", rb_digest_base_equal, 1);
id_metadata = rb_intern("metadata");
id_new = rb_intern("new");
id_initialize = rb_intern("initialize");
id_update = rb_intern("update");
id_digest = rb_intern("digest");
}
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