Fix hash buffer size in pkey programs

backport from 102a620

programs/pkey/dh_client.c

@@ -75,7 +75,7 @@ int main( void )
 
     unsigned char *p, *end;
     unsigned char buf[2048];
-    unsigned char hash[20];
+    unsigned char hash[32];
     const char *pers = "dh_client";
 
     entropy_context entropy;

programs/pkey/dh_server.c

@@ -75,7 +75,7 @@ int main( void )
     int client_fd = -1;
 
     unsigned char buf[2048];
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf2[2];
     const char *pers = "dh_server";
 

programs/pkey/pk_sign.c

@@ -74,7 +74,7 @@ int main( int argc, char *argv[] )
     pk_context pk;
     entropy_context entropy;
     ctr_drbg_context ctr_drbg;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[POLARSSL_MPI_MAX_SIZE];
     char filename[512];
     const char *pers = "pk_sign";

programs/pkey/pk_verify.c

@@ -68,7 +68,7 @@ int main( int argc, char *argv[] )
     int ret = 1;
     size_t i;
     pk_context pk;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[POLARSSL_MPI_MAX_SIZE];
     char filename[512];
 

programs/pkey/rsa_sign.c

@@ -58,7 +58,7 @@ int main( int argc, char *argv[] )
     int ret;
     size_t i;
     rsa_context rsa;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[POLARSSL_MPI_MAX_SIZE];
     char filename[512];
 

programs/pkey/rsa_sign_pss.c

@@ -74,7 +74,7 @@ int main( int argc, char *argv[] )
     pk_context pk;
     entropy_context entropy;
     ctr_drbg_context ctr_drbg;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[POLARSSL_MPI_MAX_SIZE];
     char filename[512];
     const char *pers = "rsa_sign_pss";

programs/pkey/rsa_verify.c

@@ -57,7 +57,7 @@ int main( int argc, char *argv[] )
     int ret, c;
     size_t i;
     rsa_context rsa;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[POLARSSL_MPI_MAX_SIZE];
     char filename[512];
 

programs/pkey/rsa_verify_pss.c

@@ -69,7 +69,7 @@ int main( int argc, char *argv[] )
     int ret = 1;
     size_t i;
     pk_context pk;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[POLARSSL_MPI_MAX_SIZE];
     char filename[512];