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/*
* $Id$
* 'OpenSSL for Ruby' project
* Copyright (C) 2001-2002 Michal Rokos <m.rokos@sh.cvut.cz>
* All rights reserved.
*/
/*
* This program is licenced under the same licence as Ruby.
* (See the file 'LICENCE'.)
*/
#if !defined(NO_HMAC) && !defined(OPENSSL_NO_HMAC)
#include "ossl.h"
#define MakeHMAC(obj, hmacp) {\
obj = Data_Make_Struct(cHMAC, ossl_hmac, 0, ossl_hmac_free, hmacp);\
}
#define GetHMAC(obj, hmacp) Data_Get_Struct(obj, ossl_hmac, hmacp)
/*
* Classes
*/
VALUE cHMAC;
VALUE eHMACError;
/*
* Struct
*/
typedef struct ossl_hmac_st {
HMAC_CTX *hmac;
} ossl_hmac;
static void
ossl_hmac_free(ossl_hmac *hmacp)
{
if (hmacp) {
if (hmacp->hmac) OPENSSL_free(hmacp->hmac);
hmacp->hmac = NULL;
free(hmacp);
}
}
/*
* PUBLIC
*/
/*
* PRIVATE
*/
static VALUE
ossl_hmac_s_new(int argc, VALUE *argv, VALUE klass)
{
ossl_hmac *hmacp = NULL;
VALUE obj;
MakeHMAC(obj, hmacp);
rb_obj_call_init(obj, argc, argv);
return obj;
}
static VALUE
ossl_hmac_initialize(int argc, VALUE *argv, VALUE self)
{
ossl_hmac *hmacp = NULL;
const EVP_MD *md = NULL;
VALUE key, digest;
GetHMAC(self, hmacp);
rb_scan_args(argc, argv, "20", &key, &digest);
Check_Type(key, T_STRING);
md = ossl_digest_get_EVP_MD(digest);
if (!(hmacp->hmac = OPENSSL_malloc(sizeof(HMAC_CTX)))) {
OSSL_Raise(eHMACError, "");
}
HMAC_Init(hmacp->hmac, RSTRING(key)->ptr, RSTRING(key)->len, md);
return self;
}
static VALUE
ossl_hmac_update(VALUE self, VALUE data)
{
ossl_hmac *hmacp = NULL;
GetHMAC(self, hmacp);
Check_Type(data, T_STRING);
HMAC_Update(hmacp->hmac, RSTRING(data)->ptr, RSTRING(data)->len);
return self;
}
static VALUE
ossl_hmac_hmac(VALUE self)
{
ossl_hmac *hmacp = NULL;
char *buf = NULL;
int buf_len = 0;
HMAC_CTX final;
VALUE str;
GetHMAC(self, hmacp);
if (!HMAC_CTX_copy(&final, hmacp->hmac)) {
OSSL_Raise(eHMACError, "");
}
if (!(buf = OPENSSL_malloc(HMAC_size(&final)))) {
OSSL_Raise(eHMACError, "Cannot allocate memory for hmac");
}
HMAC_Final(&final, buf, &buf_len);
str = rb_str_new(buf, buf_len);
OPENSSL_free(buf);
return str;
}
static VALUE
ossl_hmac_hexhmac(VALUE self)
{
ossl_hmac *hmacp = NULL;
static const char hex[]="0123456789abcdef";
char *buf = NULL, *hexbuf = NULL;
int i,buf_len = 0;
HMAC_CTX final;
VALUE str;
GetHMAC(self, hmacp);
if (!HMAC_CTX_copy(&final, hmacp->hmac)) {
OSSL_Raise(eHMACError, "Cannot copy HMAC CTX");
}
if (!(buf = OPENSSL_malloc(HMAC_size(&final)))) {
OSSL_Raise(eHMACError, "Cannot allocate memory for hmac");
}
HMAC_Final(&final, buf, &buf_len);
if (!(hexbuf = OPENSSL_malloc(2*buf_len+1))) {
OPENSSL_free(buf);
OSSL_Raise(eHMACError, "Memory alloc error");
}
for (i = 0; i < buf_len; i++) {
hexbuf[i + i] = hex[((unsigned char)buf[i]) >> 4];
hexbuf[i + i + 1] = hex[buf[i] & 0x0f];
}
hexbuf[i + i] = '\0';
str = rb_str_new(hexbuf, 2*buf_len);
OPENSSL_free(buf);
OPENSSL_free(hexbuf);
return str;
}
/*
* INIT
*/
void
Init_hmac(VALUE module)
{
eHMACError = rb_define_class_under(module, "HMACError", rb_eStandardError);
cHMAC = rb_define_class_under(module, "HMAC", rb_cObject);
rb_define_singleton_method(cHMAC, "new", ossl_hmac_s_new, -1);
rb_define_method(cHMAC, "initialize", ossl_hmac_initialize, -1);
rb_define_method(cHMAC, "update", ossl_hmac_update, 1);
rb_define_alias(cHMAC, "<<", "update");
rb_define_method(cHMAC, "hmac", ossl_hmac_hmac, 0);
rb_define_method(cHMAC, "hexhmac", ossl_hmac_hexhmac, 0);
rb_define_alias(cHMAC, "inspect", "hexhmac");
rb_define_alias(cHMAC, "to_str", "hexhmac");
}
#else /* NO_HMAC */
void
Init_hmac(VALUE module)
{
rb_warning("HMAC will NOT be avaible: OpenSSL is compiled without HMAC.");
}
#endif /* NO_HMAC */
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