# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import absolute_import, division, print_function

INCLUDES = """
#include <openssl/dsa.h>
"""

TYPES = """
typedef ... DSA;
"""

FUNCTIONS = """
int DSA_generate_key(DSA *);
DSA *DSA_new(void);
void DSA_free(DSA *);
DSA *DSAparams_dup(DSA *);
int DSA_size(const DSA *);
int DSA_sign(int, const unsigned char *, int, unsigned char *, unsigned int *,
             DSA *);
int DSA_verify(int, const unsigned char *, int, const unsigned char *, int,
               DSA *);

/* added in 1.1.0 to access the opaque struct */
void DSA_get0_pqg(const DSA *, const BIGNUM **, const BIGNUM **,
                  const BIGNUM **);
int DSA_set0_pqg(DSA *, BIGNUM *, BIGNUM *, BIGNUM *);
void DSA_get0_key(const DSA *, const BIGNUM **, const BIGNUM **);
int DSA_set0_key(DSA *, BIGNUM *, BIGNUM *);
int DSA_generate_parameters_ex(DSA *, int, unsigned char *, int,
                               int *, unsigned long *, BN_GENCB *);
"""

CUSTOMIZATIONS = """
/* These functions were added in OpenSSL 1.1.0 */
#if CRYPTOGRAPHY_OPENSSL_LESS_THAN_110 && !CRYPTOGRAPHY_IS_LIBRESSL
void DSA_get0_pqg(const DSA *d,
                  const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
{
    if (p != NULL)
        *p = d->p;
    if (q != NULL)
        *q = d->q;
    if (g != NULL)
        *g = d->g;
}
int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
{
    /* If the fields p, q and g in d are NULL, the corresponding input
     * parameters MUST be non-NULL.
     */
    if ((d->p == NULL && p == NULL)
        || (d->q == NULL && q == NULL)
        || (d->g == NULL && g == NULL))
        return 0;

    if (p != NULL) {
        BN_free(d->p);
        d->p = p;
    }
    if (q != NULL) {
        BN_free(d->q);
        d->q = q;
    }
    if (g != NULL) {
        BN_free(d->g);
        d->g = g;
    }

    return 1;
}
void DSA_get0_key(const DSA *d,
                  const BIGNUM **pub_key, const BIGNUM **priv_key)
{
    if (pub_key != NULL)
        *pub_key = d->pub_key;
    if (priv_key != NULL)
        *priv_key = d->priv_key;
}
int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
{
    /* If the field pub_key in d is NULL, the corresponding input
     * parameters MUST be non-NULL.  The priv_key field may
     * be left NULL.
     */
    if (d->pub_key == NULL && pub_key == NULL)
        return 0;

    if (pub_key != NULL) {
        BN_free(d->pub_key);
        d->pub_key = pub_key;
    }
    if (priv_key != NULL) {
        BN_free(d->priv_key);
        d->priv_key = priv_key;
    }

    return 1;
}
#endif
"""