pki: Set correct type for imported signatures

Issue reported by Tilo Eckert <tilo.eckert@flam.de>

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/pki_crypto.c

@@ -1608,7 +1608,7 @@ ssh_signature pki_signature_from_blob(const ssh_key pubkey,
 
     sig->type = type;
     sig->hash_type = hash_type;
-    sig->type_c = ssh_key_signature_to_char(type, hash_type);
+    sig->type_c = pubkey->type_c; /* for all types but RSA */
 
     len = ssh_string_len(sig_blob);
 
@@ -1674,6 +1674,7 @@ ssh_signature pki_signature_from_blob(const ssh_key pubkey,
         case SSH_KEYTYPE_RSA:
         case SSH_KEYTYPE_RSA1:
             sig = pki_signature_from_rsa_blob(pubkey, sig_blob, sig);
+            sig->type_c = ssh_key_signature_to_char(type, hash_type);
             break;
         case SSH_KEYTYPE_ECDSA:
 #ifdef HAVE_OPENSSL_ECC

src/pki_gcrypt.c

@@ -1855,7 +1855,7 @@ ssh_signature pki_signature_from_blob(const ssh_key pubkey,
 
     sig->type = type;
     sig->hash_type = hash_type;
-    sig->type_c = ssh_key_signature_to_char(type, hash_type);
+    sig->type_c = pubkey->type_c; /* for all types but RSA */
 
     len = ssh_string_len(sig_blob);
 
@@ -1921,6 +1921,7 @@ ssh_signature pki_signature_from_blob(const ssh_key pubkey,
                 ssh_signature_free(sig);
                 return NULL;
             }
+            sig->type_c = ssh_key_signature_to_char(type, hash_type);
             break;
         case SSH_KEYTYPE_ED25519:
 		rc = pki_ed25519_sig_from_blob(sig, sig_blob);

src/pki_mbedcrypto.c

@@ -904,11 +904,12 @@ ssh_signature pki_signature_from_blob(const ssh_key pubkey,
 
     sig->type = type;
     sig->hash_type = hash_type;
-    sig->type_c = ssh_key_signature_to_char(type, hash_type);
+    sig->type_c = pubkey->type_c; /* for all types but RSA */
 
     switch(type) {
         case SSH_KEYTYPE_RSA:
             sig = pki_signature_from_rsa_blob(pubkey, sig_blob, sig);
+            sig->type_c = ssh_key_signature_to_char(type, hash_type);
             break;
         case SSH_KEYTYPE_ECDSA: {
             ssh_buffer b;