+#include "internal/cryptlib.h"
+#include "internal/refcount.h"
+#include <openssl/bn.h>
+#include "dsa_locl.h"
+#include <openssl/asn1.h>
+#include <openssl/engine.h>
+#include <openssl/dh.h>
+
+DSA *DSA_new(void)
+{
+ return DSA_new_method(NULL);
+}
+
+int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
+{
+ /*
+ * NB: The caller is specifically setting a method, so it's not up to us
+ * to deal with which ENGINE it comes from.
+ */
+ const DSA_METHOD *mtmp;
+ mtmp = dsa->meth;
+ if (mtmp->finish)
+ mtmp->finish(dsa);
+#ifndef OPENSSL_NO_ENGINE
+ ENGINE_finish(dsa->engine);
+ dsa->engine = NULL;
+#endif
+ dsa->meth = meth;
+ if (meth->init)
+ meth->init(dsa);
+ return 1;
+}
+
+const DSA_METHOD *DSA_get_method(DSA *d)
+{
+ return d->meth;
+}
+
+DSA *DSA_new_method(ENGINE *engine)
+{
+ DSA *ret = OPENSSL_zalloc(sizeof(*ret));
+
+ if (ret == NULL) {
+ DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+ ret->references = 1;
+ ret->lock = CRYPTO_THREAD_lock_new();
+ if (ret->lock == NULL) {
+ DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
+ OPENSSL_free(ret);
+ return NULL;
+ }
+
+ ret->meth = DSA_get_default_method();
+#ifndef OPENSSL_NO_ENGINE
+ ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */
+ if (engine) {
+ if (!ENGINE_init(engine)) {
+ DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
+ goto err;
+ }
+ ret->engine = engine;
+ } else
+ ret->engine = ENGINE_get_default_DSA();
+ if (ret->engine) {
+ ret->meth = ENGINE_get_DSA(ret->engine);
+ if (ret->meth == NULL) {
+ DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
+ goto err;
+ }
+ }
+#endif
+
+ ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
+
+ if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data))
+ goto err;
+
+ if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
+ DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_INIT_FAIL);
+err:
+ DSA_free(ret);
+ ret = NULL;
+ }
+
+ return ret;
+}
+
+void DSA_free(DSA *r)
+{
+ int i;
+
+ if (r == NULL)
+ return;
+
+ CRYPTO_DOWN_REF(&r->references, &i, r->lock);
+ REF_PRINT_COUNT("DSA", r);
+ if (i > 0)
+ return;
+ REF_ASSERT_ISNT(i < 0);
+
+ if (r->meth->finish)
+ r->meth->finish(r);
+#ifndef OPENSSL_NO_ENGINE
+ ENGINE_finish(r->engine);
+#endif
+
+ CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
+
+ CRYPTO_THREAD_lock_free(r->lock);
+
+ BN_clear_free(r->p);
+ BN_clear_free(r->q);
+ BN_clear_free(r->g);
+ BN_clear_free(r->pub_key);
+ BN_clear_free(r->priv_key);
+ OPENSSL_free(r);
+}
+
+int DSA_up_ref(DSA *r)
+{
+ int i;
+
+ if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
+ return 0;
+
+ REF_PRINT_COUNT("DSA", r);
+ REF_ASSERT_ISNT(i < 2);
+ return ((i > 1) ? 1 : 0);
+}
+
+int DSA_size(const DSA *r)
+{
+ int ret, i;
+ ASN1_INTEGER bs;
+ unsigned char buf[4]; /* 4 bytes looks really small. However,
+ * i2d_ASN1_INTEGER() will not look beyond
+ * the first byte, as long as the second
+ * parameter is NULL. */
+
+ i = BN_num_bits(r->q);
+ bs.length = (i + 7) / 8;
+ bs.data = buf;
+ bs.type = V_ASN1_INTEGER;
+ /* If the top bit is set the asn1 encoding is 1 larger. */
+ buf[0] = 0xff;
+
+ i = i2d_ASN1_INTEGER(&bs, NULL);
+ i += i; /* r and s */
+ ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
+ return ret;
+}
+
+int DSA_set_ex_data(DSA *d, int idx, void *arg)
+{
+ return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
+}
+
+void *DSA_get_ex_data(DSA *d, int idx)
+{
+ return CRYPTO_get_ex_data(&d->ex_data, idx);
+}
+
+int DSA_security_bits(const DSA *d)
+{
+ if (d->p && d->q)
+ return BN_security_bits(BN_num_bits(d->p), BN_num_bits(d->q));
+ return -1;
+}
+
+#ifndef OPENSSL_NO_DH
+DH *DSA_dup_DH(const DSA *r)
+{
+ /*
+ * DSA has p, q, g, optional pub_key, optional priv_key. DH has p,
+ * optional length, g, optional pub_key, optional priv_key, optional q.
+ */
+
+ DH *ret = NULL;
+ BIGNUM *p = NULL, *q = NULL, *g = NULL, *pub_key = NULL, *priv_key = NULL;
+
+ if (r == NULL)
+ goto err;
+ ret = DH_new();
+ if (ret == NULL)
+ goto err;
+ if (r->p != NULL || r->g != NULL || r->q != NULL) {
+ if (r->p == NULL || r->g == NULL || r->q == NULL) {
+ /* Shouldn't happen */
+ goto err;
+ }
+ p = BN_dup(r->p);
+ g = BN_dup(r->g);
+ q = BN_dup(r->q);
+ if (p == NULL || g == NULL || q == NULL || !DH_set0_pqg(ret, p, q, g))
+ goto err;
+ p = g = q = NULL;
+ }
+
+ if (r->pub_key != NULL) {
+ pub_key = BN_dup(r->pub_key);
+ if (pub_key == NULL)
+ goto err;
+ if (r->priv_key != NULL) {
+ priv_key = BN_dup(r->priv_key);
+ if (priv_key == NULL)
+ goto err;
+ }
+ if (!DH_set0_key(ret, pub_key, priv_key))
+ goto err;
+ } else if (r->priv_key != NULL) {
+ /* Shouldn't happen */
+ goto err;
+ }
+
+ return ret;
+
+ err:
+ BN_free(p);
+ BN_free(g);
+ BN_free(q);
+ BN_free(pub_key);
+ BN_free(priv_key);
+ DH_free(ret);
+ return NULL;
+}