#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) { \
ossl_raise(rb_eRuntimeError, "THIS IS NOT A DSA!"); \
} \
} while (0)
#define DSA_HAS_PRIVATE(dsa) ((dsa)->priv_key)
#define DSA_PRIVATE(obj,dsa) (DSA_HAS_PRIVATE(dsa)||OSSL_PKEY_IS_PRIVATE(obj))
VALUE cDSA;
VALUE eDSAError;
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;
}
#if defined(HAVE_DSA_GENERATE_PARAMETERS_EX) && HAVE_BN_GENCB
struct dsa_blocking_gen_arg {
DSA *dsa;
int size;
unsigned char* seed;
int seed_len;
int *counter;
unsigned long *h;
BN_GENCB *cb;
int result;
};
static void *
dsa_blocking_gen(void *arg)
{
struct dsa_blocking_gen_arg *gen = (struct dsa_blocking_gen_arg *)arg;
gen->result = DSA_generate_parameters_ex(gen->dsa, gen->size, gen->seed, gen->seed_len, gen->counter, gen->h, gen->cb);
return 0;
}
#endif
static DSA *
dsa_generate(int size)
{
#if defined(HAVE_DSA_GENERATE_PARAMETERS_EX) && HAVE_BN_GENCB
BN_GENCB cb;
struct ossl_generate_cb_arg cb_arg;
struct dsa_blocking_gen_arg gen_arg;
DSA *dsa = DSA_new();
unsigned char seed[20];
int seed_len = 20, counter;
unsigned long h;
if (!dsa) return 0;
if (!RAND_bytes(seed, seed_len)) {
DSA_free(dsa);
return 0;
}
memset(&cb_arg, 0, sizeof(struct ossl_generate_cb_arg));
if (rb_block_given_p())
cb_arg.yield = 1;
BN_GENCB_set(&cb, ossl_generate_cb_2, &cb_arg);
gen_arg.dsa = dsa;
gen_arg.size = size;
gen_arg.seed = seed;
gen_arg.seed_len = seed_len;
gen_arg.counter = &counter;
gen_arg.h = &h;
gen_arg.cb = &cb;
if (cb_arg.yield == 1) {
dsa_blocking_gen(&gen_arg);
} else {
rb_thread_call_without_gvl(dsa_blocking_gen, &gen_arg, ossl_generate_cb_stop, &cb_arg);
}
if (!gen_arg.result) {
DSA_free(dsa);
if (cb_arg.state) rb_jump_tag(cb_arg.state);
return 0;
}
#else
DSA *dsa;
unsigned char seed[20];
int seed_len = 20, counter;
unsigned long h;
if (!RAND_bytes(seed, seed_len)) {
return 0;
}
dsa = DSA_generate_parameters(size, seed, seed_len, &counter, &h,
rb_block_given_p() ? ossl_generate_cb : NULL, NULL);
if(!dsa) return 0;
#endif
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(NUM2INT(size));
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 arg, pass;
GetPKey(self, pkey);
if(rb_scan_args(argc, argv, "02", &arg, &pass) == 0) {
dsa = DSA_new();
}
else if (FIXNUM_P(arg)) {
if (!(dsa = dsa_generate(FIX2INT(arg)))) {
ossl_raise(eDSAError, NULL);
}
}
else {
if (!NIL_P(pass)) passwd = StringValuePtr(pass);
arg = ossl_to_der_if_possible(arg);
in = ossl_obj2bio(arg);
dsa = PEM_read_bio_DSAPrivateKey(in, NULL, ossl_pem_passwd_cb, passwd);
if (!dsa) {
OSSL_BIO_reset(in);
dsa = PEM_read_bio_DSA_PUBKEY(in, NULL, NULL, NULL);
}
if (!dsa) {
OSSL_BIO_reset(in);
dsa = d2i_DSAPrivateKey_bio(in, NULL);
}
if (!dsa) {
OSSL_BIO_reset(in);
dsa = d2i_DSA_PUBKEY_bio(in, NULL);
}
if (!dsa) {
OSSL_BIO_reset(in);
dsa = PEM_read_bio_DSAPublicKey(in, NULL, NULL, NULL);
}
BIO_free(in);
if (!dsa) {
ERR_clear_error();
ossl_raise(eDSAError, "Neither PUB key nor PRIV key");
}
}
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);
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(self, pkey->pkey.dsa)) ? Qtrue : Qfalse;
}
static VALUE
ossl_dsa_export(int argc, VALUE *argv, VALUE self)
{
EVP_PKEY *pkey;
BIO *out;
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)) {
StringValue(pass);
if (RSTRING_LENINT(pass) < OSSL_MIN_PWD_LEN)
ossl_raise(eOSSLError, "OpenSSL requires passwords to be at least four characters long");
passwd = RSTRING_PTR(pass);
}
}
if (!(out = BIO_new(BIO_s_mem()))) {
ossl_raise(eDSAError, NULL);
}
if (DSA_HAS_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_DSA_PUBKEY(out, pkey->pkey.dsa)) {
BIO_free(out);
ossl_raise(eDSAError, NULL);
}
}
str = ossl_membio2str(out);
return str;
}
static VALUE
ossl_dsa_to_der(VALUE self)
{
EVP_PKEY *pkey;
int (*i2d_func)_((DSA*, unsigned char**));
unsigned char *p;
long len;
VALUE str;
GetPKeyDSA(self, pkey);
if(DSA_HAS_PRIVATE(pkey->pkey.dsa))
i2d_func = (int(*)_((DSA*,unsigned char**)))i2d_DSAPrivateKey;
else
i2d_func = i2d_DSA_PUBKEY;
if((len = i2d_func(pkey->pkey.dsa, NULL)) <= 0)
ossl_raise(eDSAError, NULL);
str = rb_str_new(0, len);
p = (unsigned char *)RSTRING_PTR(str);
if(i2d_func(pkey->pkey.dsa, &p) < 0)
ossl_raise(eDSAError, NULL);
ossl_str_adjust(str, p);
return str;
}
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;
}
static VALUE
ossl_dsa_to_text(VALUE self)
{
EVP_PKEY *pkey;
BIO *out;
VALUE str;
GetPKeyDSA(self, pkey);
if (!(out = BIO_new(BIO_s_mem()))) {
ossl_raise(eDSAError, NULL);
}
if (!DSA_print(out, pkey->pkey.dsa, 0)) {
BIO_free(out);
ossl_raise(eDSAError, NULL);
}
str = ossl_membio2str(out);
return str;
}
static VALUE
ossl_dsa_to_public_key(VALUE self)
{
EVP_PKEY *pkey;
DSA *dsa;
VALUE obj;
GetPKeyDSA(self, pkey);
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;
}
#define ossl_dsa_buf_size(pkey) (DSA_size((pkey)->pkey.dsa)+16)
static VALUE
ossl_dsa_sign(VALUE self, VALUE data)
{
EVP_PKEY *pkey;
unsigned int buf_len;
VALUE str;
GetPKeyDSA(self, pkey);
StringValue(data);
if (!DSA_PRIVATE(self, pkey->pkey.dsa)) {
ossl_raise(eDSAError, "Private DSA key needed!");
}
str = rb_str_new(0, ossl_dsa_buf_size(pkey));
if (!DSA_sign(0, (unsigned char *)RSTRING_PTR(data), RSTRING_LENINT(data),
(unsigned char *)RSTRING_PTR(str),
&buf_len, pkey->pkey.dsa)) {
ossl_raise(eDSAError, NULL);
}
rb_str_set_len(str, buf_len);
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);
ret = DSA_verify(0, (unsigned char *)RSTRING_PTR(digest), RSTRING_LENINT(digest),
(unsigned char *)RSTRING_PTR(sig), RSTRING_LENINT(sig), pkey->pkey.dsa);
if (ret < 0) {
ossl_raise(eDSAError, NULL);
}
else if (ret == 1) {
return Qtrue;
}
return Qfalse;
}
OSSL_PKEY_BN(dsa, p)
OSSL_PKEY_BN(dsa, q)
OSSL_PKEY_BN(dsa, g)
OSSL_PKEY_BN(dsa, pub_key)
OSSL_PKEY_BN(dsa, priv_key)
void
Init_ossl_dsa()
{
#if 0
mOSSL = rb_define_module("OpenSSL");
mPKey = rb_define_module_under(mOSSL, "PKey");
#endif
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, "to_der", ossl_dsa_to_der, 0);
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);
DEF_OSSL_PKEY_BN(cDSA, dsa, p);
DEF_OSSL_PKEY_BN(cDSA, dsa, q);
DEF_OSSL_PKEY_BN(cDSA, dsa, g);
DEF_OSSL_PKEY_BN(cDSA, dsa, pub_key);
DEF_OSSL_PKEY_BN(cDSA, dsa, priv_key);
rb_define_method(cDSA, "params", ossl_dsa_get_params, 0);
}
#else
void
Init_ossl_dsa()
{
}
#endif