Fix hash buffer size in pkey programs

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";
 
     mbedtls_entropy_context entropy;

programs/pkey/dh_server.c

@@ -74,7 +74,7 @@ int main( void )
     mbedtls_net_context listen_fd, client_fd;
 
     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

@@ -64,7 +64,7 @@ int main( int argc, char *argv[] )
     mbedtls_pk_context pk;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
     const char *pers = "mbedtls_pk_sign";

programs/pkey/pk_verify.c

@@ -59,7 +59,7 @@ int main( int argc, char *argv[] )
     int ret = 1;
     size_t i;
     mbedtls_pk_context pk;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
 

programs/pkey/rsa_sign.c

@@ -59,7 +59,7 @@ int main( int argc, char *argv[] )
     int ret;
     size_t i;
     mbedtls_rsa_context rsa;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
 

programs/pkey/rsa_sign_pss.c

@@ -65,7 +65,7 @@ int main( int argc, char *argv[] )
     mbedtls_pk_context pk;
     mbedtls_entropy_context entropy;
     mbedtls_ctr_drbg_context ctr_drbg;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];
     const char *pers = "rsa_sign_pss";

programs/pkey/rsa_verify.c

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

programs/pkey/rsa_verify_pss.c

@@ -63,7 +63,7 @@ int main( int argc, char *argv[] )
     int ret = 1;
     size_t i;
     mbedtls_pk_context pk;
-    unsigned char hash[20];
+    unsigned char hash[32];
     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     char filename[512];