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ruby--ruby/ext/openssl/ossl_pkey_dsa.c

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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(OPENSSL_NO_DSA)
#include "ossl.h"
#define GetPKeyDSA(obj, pkey) do { \
GetPKey(obj, pkey); \
if (EVP_PKEY_type(pkey->type) != EVP_PKEY_DSA) { /* PARANOIA? */ \
ossl_raise(rb_eRuntimeError, "THIS IS NOT A DSA!"); \
} \
} while (0)
#define DSA_PRIVATE(dsa) ((dsa)->priv_key)
/*
* Classes
*/
VALUE cDSA;
VALUE eDSAError;
/*
* Public
*/
static VALUE
dsa_instance(VALUE klass, DSA *dsa)
{
EVP_PKEY *pkey;
VALUE obj;
if (!dsa) {
return Qfalse;
}
if (!(pkey = EVP_PKEY_new())) {
return Qfalse;
}
if (!EVP_PKEY_assign_DSA(pkey, dsa)) {
EVP_PKEY_free(pkey);
return Qfalse;
}
WrapPKey(klass, obj, pkey);
return obj;
}
VALUE
ossl_dsa_new(EVP_PKEY *pkey)
{
VALUE obj;
if (!pkey) {
obj = dsa_instance(cDSA, DSA_new());
} else {
if (EVP_PKEY_type(pkey->type) != EVP_PKEY_DSA) {
ossl_raise(rb_eTypeError, "Not a DSA key!");
}
WrapPKey(cDSA, obj, pkey);
}
if (obj == Qfalse) {
ossl_raise(eDSAError, NULL);
}
return obj;
}
/*
* Private
*/
/*
* CB for yielding when generating DSA params
*/
static void
ossl_dsa_generate_cb(int p, int n, void *arg)
{
VALUE ary;
ary = rb_ary_new2(2);
rb_ary_store(ary, 0, INT2NUM(p));
rb_ary_store(ary, 1, INT2NUM(n));
rb_yield(ary);
}
static DSA *
dsa_generate(int size)
{
DSA *dsa;
unsigned char seed[20];
int seed_len = 20, counter;
unsigned long h;
void (*cb)(int, int, void *) = NULL;
if (!RAND_bytes(seed, seed_len)) {
return 0;
}
if (rb_block_given_p()) {
cb = ossl_dsa_generate_cb;
}
dsa = DSA_generate_parameters(size, seed, seed_len, &counter, &h, cb, NULL);
if(!dsa) { /* arg to cb = NULL */
return 0;
}
if (!DSA_generate_key(dsa)) {
DSA_free(dsa);
return 0;
}
return dsa;
}
static VALUE
ossl_dsa_s_generate(VALUE klass, VALUE size)
{
DSA *dsa = dsa_generate(FIX2INT(size)); /* err handled by dsa_instance */
VALUE obj = dsa_instance(klass, dsa);
if (obj == Qfalse) {
DSA_free(dsa);
ossl_raise(eDSAError, NULL);
}
return obj;
}
static VALUE
ossl_dsa_initialize(int argc, VALUE *argv, VALUE self)
{
EVP_PKEY *pkey;
DSA *dsa;
BIO *in;
char *passwd = NULL;
VALUE buffer, pass;
GetPKey(self, pkey);
rb_scan_args(argc, argv, "11", &buffer, &pass);
if (FIXNUM_P(buffer)) {
if (!(dsa = dsa_generate(FIX2INT(buffer)))) {
ossl_raise(eDSAError, NULL);
}
} else {
StringValue(buffer);
if (!NIL_P(pass)) {
passwd = StringValuePtr(pass);
}
in = BIO_new_mem_buf(RSTRING(buffer)->ptr, RSTRING(buffer)->len);
if (!in){
ossl_raise(eDSAError, NULL);
}
dsa = PEM_read_bio_DSAPrivateKey(in, NULL, ossl_pem_passwd_cb, passwd);
if (!dsa) {
BIO_reset(in);
dsa = PEM_read_bio_DSAPublicKey(in, NULL, NULL, NULL);
}
if (!dsa) {
BIO_reset(in);
dsa = PEM_read_bio_DSA_PUBKEY(in, NULL, NULL, NULL);
}
if (!dsa) {
BIO_free(in);
ossl_raise(eDSAError, "Neither PUB key nor PRIV key:");
}
BIO_free(in);
}
if (!EVP_PKEY_assign_DSA(pkey, dsa)) {
DSA_free(dsa);
ossl_raise(eDSAError, NULL);
}
return self;
}
static VALUE
ossl_dsa_is_public(VALUE self)
{
EVP_PKEY *pkey;
GetPKeyDSA(self, pkey);
/*
* Do we need to check dsap->dsa->public_pkey?
* return Qtrue;
*/
return (pkey->pkey.dsa->pub_key) ? Qtrue : Qfalse;
}
static VALUE
ossl_dsa_is_private(VALUE self)
{
EVP_PKEY *pkey;
GetPKeyDSA(self, pkey);
return (DSA_PRIVATE(pkey->pkey.dsa)) ? Qtrue : Qfalse;
}
static VALUE
ossl_dsa_export(int argc, VALUE *argv, VALUE self)
{
EVP_PKEY *pkey;
BIO *out;
BUF_MEM *buf;
const EVP_CIPHER *ciph = NULL;
char *passwd = NULL;
VALUE cipher, pass, str;
GetPKeyDSA(self, pkey);
rb_scan_args(argc, argv, "02", &cipher, &pass);
if (!NIL_P(cipher)) {
ciph = GetCipherPtr(cipher);
if (!NIL_P(pass)) {
passwd = StringValuePtr(pass);
}
}
if (!(out = BIO_new(BIO_s_mem()))) {
ossl_raise(eDSAError, NULL);
}
if (DSA_PRIVATE(pkey->pkey.dsa)) {
if (!PEM_write_bio_DSAPrivateKey(out, pkey->pkey.dsa, ciph,
NULL, 0, ossl_pem_passwd_cb, passwd)){
BIO_free(out);
ossl_raise(eDSAError, NULL);
}
} else {
if (!PEM_write_bio_DSAPublicKey(out, pkey->pkey.dsa)) {
BIO_free(out);
ossl_raise(eDSAError, NULL);
}
}
BIO_get_mem_ptr(out, &buf);
str = rb_str_new(buf->data, buf->length);
BIO_free(out);
return str;
}
/*
* Stores all parameters of key to the hash
* INSECURE: PRIVATE INFORMATIONS CAN LEAK OUT!!!
* Don't use :-)) (I's up to you)
*/
static VALUE
ossl_dsa_get_params(VALUE self)
{
EVP_PKEY *pkey;
VALUE hash;
GetPKeyDSA(self, pkey);
hash = rb_hash_new();
rb_hash_aset(hash, rb_str_new2("p"), ossl_bn_new(pkey->pkey.dsa->p));
rb_hash_aset(hash, rb_str_new2("q"), ossl_bn_new(pkey->pkey.dsa->q));
rb_hash_aset(hash, rb_str_new2("g"), ossl_bn_new(pkey->pkey.dsa->g));
rb_hash_aset(hash, rb_str_new2("pub_key"), ossl_bn_new(pkey->pkey.dsa->pub_key));
rb_hash_aset(hash, rb_str_new2("priv_key"), ossl_bn_new(pkey->pkey.dsa->priv_key));
return hash;
}
/*
* Prints all parameters of key to buffer
* INSECURE: PRIVATE INFORMATIONS CAN LEAK OUT!!!
* Don't use :-)) (I's up to you)
*/
static VALUE
ossl_dsa_to_text(VALUE self)
{
EVP_PKEY *pkey;
BIO *out;
BUF_MEM *buf;
VALUE str;
GetPKeyDSA(self, pkey);
if (!(out = BIO_new(BIO_s_mem()))) {
ossl_raise(eDSAError, NULL);
}
if (!DSA_print(out, pkey->pkey.dsa, 0)) { //offset = 0
BIO_free(out);
ossl_raise(eDSAError, NULL);
}
BIO_get_mem_ptr(out, &buf);
str = rb_str_new(buf->data, buf->length);
BIO_free(out);
return str;
}
/*
* Makes new instance DSA PUBLIC_KEY from PRIVATE_KEY
*/
static VALUE
ossl_dsa_to_public_key(VALUE self)
{
EVP_PKEY *pkey;
DSA *dsa;
VALUE obj;
GetPKeyDSA(self, pkey);
/* err check performed by dsa_instance */
dsa = DSAPublicKey_dup(pkey->pkey.dsa);
obj = dsa_instance(CLASS_OF(self), dsa);
if (obj == Qfalse) {
DSA_free(dsa);
ossl_raise(eDSAError, NULL);
}
return obj;
}
static VALUE
ossl_dsa_sign(VALUE self, VALUE data)
{
EVP_PKEY *pkey;
char *buf;
int buf_len;
VALUE str;
GetPKeyDSA(self, pkey);
StringValue(data);
if (!DSA_PRIVATE(pkey->pkey.dsa)) {
ossl_raise(eDSAError, "Private DSA key needed!");
}
if (!(buf = OPENSSL_malloc(DSA_size(pkey->pkey.dsa) + 16))) {
ossl_raise(eDSAError, NULL);
}
if (!DSA_sign(0, RSTRING(data)->ptr, RSTRING(data)->len, buf,
&buf_len, pkey->pkey.dsa)) { /* type is ignored (0) */
OPENSSL_free(buf);
ossl_raise(eDSAError, NULL);
}
str = rb_str_new(buf, buf_len);
OPENSSL_free(buf);
return str;
}
static VALUE
ossl_dsa_verify(VALUE self, VALUE digest, VALUE sig)
{
EVP_PKEY *pkey;
int ret;
GetPKeyDSA(self, pkey);
StringValue(digest);
StringValue(sig);
/* type is ignored (0) */
ret = DSA_verify(0, RSTRING(digest)->ptr, RSTRING(digest)->len,
RSTRING(sig)->ptr, RSTRING(sig)->len, pkey->pkey.dsa);
if (ret < 0) {
ossl_raise(eDSAError, NULL);
}
else if (ret == 1) {
return Qtrue;
}
return Qfalse;
}
/*
* INIT
*/
void
Init_ossl_dsa()
{
eDSAError = rb_define_class_under(mPKey, "DSAError", ePKeyError);
cDSA = rb_define_class_under(mPKey, "DSA", cPKey);
rb_define_singleton_method(cDSA, "generate", ossl_dsa_s_generate, 1);
rb_define_method(cDSA, "initialize", ossl_dsa_initialize, -1);
rb_define_method(cDSA, "public?", ossl_dsa_is_public, 0);
rb_define_method(cDSA, "private?", ossl_dsa_is_private, 0);
rb_define_method(cDSA, "to_text", ossl_dsa_to_text, 0);
rb_define_method(cDSA, "export", ossl_dsa_export, -1);
rb_define_alias(cDSA, "to_pem", "export");
rb_define_alias(cDSA, "to_s", "export");
rb_define_method(cDSA, "public_key", ossl_dsa_to_public_key, 0);
rb_define_method(cDSA, "syssign", ossl_dsa_sign, 1);
rb_define_method(cDSA, "sysverify", ossl_dsa_verify, 2);
rb_define_method(cDSA, "params", ossl_dsa_get_params, 0);
}
#else /* defined NO_DSA */
# warning >>> OpenSSL is compiled without DSA support <<<
void
Init_ossl_dsa()
{
rb_warning("OpenSSL is compiled without DSA support");
}
#endif /* NO_DSA */
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