Fix some style issues in the TLSv1.3 nonce construction code

Reviewed-by: Rich Salz <rsalz@openssl.org>

engines/e_ossltest.c

@@ -619,6 +619,7 @@ int ossltest_aes128_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 {
     unsigned char *tmpbuf = OPENSSL_malloc(inl);
 
+    /* OPENSSL_malloc will return NULL if inl == 0 */
     if (tmpbuf == NULL && inl > 0)
         return -1;
 
@@ -628,9 +629,7 @@ int ossltest_aes128_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
     /* Go through the motions of encrypting it */
     EVP_CIPHER_meth_get_do_cipher(EVP_aes_128_gcm())(ctx, out, in, inl);
 
-    /*
+    /* Throw it all away and just use the plaintext as the output */
-     * Throw it all away and just use the plaintext as the output
-     */
     memcpy(out, tmpbuf, inl);
     OPENSSL_free(tmpbuf);
 
@@ -640,10 +639,8 @@ int ossltest_aes128_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 static int ossltest_aes128_gcm_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
                                     void *ptr)
 {
-    int ret;
-
     /* Pass the ctrl down */
-    ret = EVP_CIPHER_meth_get_ctrl(EVP_aes_128_gcm())(ctx, type, arg, ptr);
+    int ret = EVP_CIPHER_meth_get_ctrl(EVP_aes_128_gcm())(ctx, type, arg, ptr);
 
     if (ret <= 0)
         return ret;

ssl/record/ssl3_record_tls13.c

@@ -80,7 +80,7 @@ int tls13_enc(SSL *s, SSL3_RECORD *recs, size_t n_recs, int send)
     for (loop = 0; loop < SEQ_NUM_SIZE; loop++)
         iv[offset + loop] = staticiv[offset + loop] ^ seq[loop];
 
-    /* TODO(size_t): lenu/lenf should be a size_t but EVP can't support it */
+    /* TODO(size_t): lenu/lenf should be a size_t but EVP doesn't support it */
     if (EVP_CipherInit_ex(ctx, NULL, NULL, NULL, iv, send) <= 0
             || EVP_CipherUpdate(ctx, rec->data, &lenu, rec->input,
                                 (unsigned int)rec->length) <= 0

test/tls13encryptiontest.c

@@ -15,6 +15,11 @@
 #include "testutil.h"
 #include "test_main.h"
 
+/*
+ * Based on the test vectors provided in:
+ * https://www.ietf.org/id/draft-thomson-tls-tls13-vectors-01.txt
+ */
+
 struct record_data {
     const char *plaintext;
     const char *ciphertext;
@@ -130,7 +135,7 @@ struct record_data {
 static int load_record(SSL3_RECORD *rec, size_t recnum, unsigned char **key,
                        unsigned char *iv, size_t ivlen, unsigned char *seq)
 {
-    unsigned char *pt = NULL, *sq = NULL, *ivtmp = NULL;;
+    unsigned char *pt = NULL, *sq = NULL, *ivtmp = NULL;
     long ptlen;
 
     *key = OPENSSL_hexstr2buf(refdata[recnum].key, NULL);
@@ -199,6 +204,7 @@ static int test_record(SSL3_RECORD *rec, size_t recnum, int enc)
     OPENSSL_free(refd);
     return ret;
 }
+
 static int test_tls13_encryption(void)
 {
     SSL_CTX *ctx = NULL;
@@ -231,21 +237,20 @@ static int test_tls13_encryption(void)
     }
 
     for (ctr = 0; ctr < OSSL_NELEM(refdata); ctr++) {
-        /*
+        /* Load the record */
-         * Load the record, set up the read/write sequences and load the key into
-         * the EVP_CIPHER_CTXs
-         */
         ivlen = EVP_CIPHER_iv_length(ciph);
         if (!load_record(&rec, ctr, &key, s->read_iv, ivlen,
                          RECORD_LAYER_get_read_sequence(&s->rlayer))) {
             fprintf(stderr, "Failed loading key into EVP_CIPHER_CTX\n");
             goto err;
-         }
+        }
 
+        /* Set up the read/write sequences */
         memcpy(RECORD_LAYER_get_write_sequence(&s->rlayer),
                RECORD_LAYER_get_read_sequence(&s->rlayer), SEQ_NUM_SIZE);
         memcpy(s->write_iv, s->read_iv, ivlen);
 
+        /* Load the key into the EVP_CIPHER_CTXs */
         if (EVP_CipherInit_ex(s->enc_write_ctx, ciph, NULL, key, NULL, 1) <= 0
                 || EVP_CipherInit_ex(s->enc_read_ctx, ciph, NULL, key, NULL, 0)
                    <= 0) {
@@ -258,7 +263,6 @@ static int test_tls13_encryption(void)
             fprintf(stderr, "Failed to encrypt record\n");
             goto err;
         }
-
         if (!test_record(&rec, ctr, 1)) {
             fprintf(stderr, "Record encryption test failed\n");
             goto err;
@@ -269,7 +273,6 @@ static int test_tls13_encryption(void)
             fprintf(stderr, "Failed to decrypt record\n");
             goto err;
         }
-
         if (!test_record(&rec, ctr, 0)) {
             fprintf(stderr, "Record decryption test failed\n");
             goto err;
@@ -287,6 +290,7 @@ static int test_tls13_encryption(void)
 
     fprintf(stderr, "PASS: %"OSSLzu" records tested\n", ctr);
     ret = 1;
+
  err:
     OPENSSL_free(rec.data);
     OPENSSL_free(key);
@@ -294,7 +298,6 @@ static int test_tls13_encryption(void)
     OPENSSL_free(seq);
     SSL_free(s);
     SSL_CTX_free(ctx);
-
     return ret;
 }