Constify the parameter getters for RSA, DSA and DH

Including documentation changes

Reviewed-by: Stephen Henson <steve@openssl.org>
Reviewed-by: Emilia Käsper <emilia@openssl.org>

doc/crypto/DH_get0_pqg.pod

diff --git a/doc/crypto/DH_get0_pqg.pod b/doc/crypto/DH_get0_pqg.pod
index 6c6b661..79647bf 100644
--- a/doc/crypto/DH_get0_pqg.pod
+++ b/doc/crypto/DH_get0_pqg.pod
@@ -10,9 +10,11 @@
 
  #include <openssl/dh.h>
 
- void DH_get0_pqg(const DH *dh, BIGNUM **p, BIGNUM **q, BIGNUM **g);
+ void DH_get0_pqg(const DH *dh,
+                  const BIGNUM **p, const BIGNUM **q, const BIGNUM **g);
  int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
- void DH_get0_key(const DH *dh, BIGNUM **pub_key, BIGNUM **priv_key);
+ void DH_get0_key(const DH *dh,
+                  const BIGNUM **pub_key, const BIGNUM **priv_key);
  int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
  void DH_clear_flags(DH *dh, int flags);
  int DH_test_flags(const DH *dh, int flags);

doc/crypto/DSA_get0_pqg.pod

diff --git a/doc/crypto/DSA_get0_pqg.pod b/doc/crypto/DSA_get0_pqg.pod
index 95173bc..e87e42a 100644
--- a/doc/crypto/DSA_get0_pqg.pod
+++ b/doc/crypto/DSA_get0_pqg.pod
@@ -10,9 +10,11 @@
 
  #include <openssl/dsa.h>
 
- void DSA_get0_pqg(const DSA *d, BIGNUM **p, BIGNUM **q, BIGNUM **g);
+ void DSA_get0_pqg(const DSA *d,
+                   const BIGNUM **p, const BIGNUM **q, const BIGNUM **g);
  int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g);
- void DSA_get0_key(const DSA *d, BIGNUM **pub_key, BIGNUM **priv_key);
+ void DSA_get0_key(const DSA *d,
+                   const BIGNUM **pub_key, const BIGNUM **priv_key);
  int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key);
  void DSA_clear_flags(DSA *d, int flags);
  int DSA_test_flags(const DSA *d, int flags);

doc/crypto/RSA_get0_key.pod

diff --git a/doc/crypto/RSA_get0_key.pod b/doc/crypto/RSA_get0_key.pod
index 19c7f3d..77e0d3b 100644
--- a/doc/crypto/RSA_get0_key.pod
+++ b/doc/crypto/RSA_get0_key.pod
@@ -14,10 +14,12 @@
  int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d);
  int RSA_set0_factors(RSA *r, BIGNUM *p, BIGNUM *q);
  int RSA_set0_crt_params(RSA *r,BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp);
- void RSA_get0_key(const RSA *r, BIGNUM **n, BIGNUM **e, BIGNUM **d);
- void RSA_get0_factors(const RSA *r, BIGNUM **p, BIGNUM **q);
+ void RSA_get0_key(const RSA *r,
+                   const BIGNUM **n, const BIGNUM **e, const BIGNUM **d);
+ void RSA_get0_factors(const RSA *r, const BIGNUM **p, const BIGNUM **q);
  void RSA_get0_crt_params(const RSA *r,
-                          BIGNUM **dmp1, BIGNUM **dmq1, BIGNUM **iqmp);
+                          const BIGNUM **dmp1, const BIGNUM **dmq1,
+                          const BIGNUM **iqmp);
  void RSA_clear_flags(RSA *r, int flags);
  int RSA_test_flags(const RSA *r, int flags);
  void RSA_set_flags(RSA *r, int flags);