Revert 97269 - Send only one byte of data in the first CBC encrypted

net/third_party/nss/ssl/ssl3con.c

Index: net/third_party/nss/ssl/ssl3con.c
===================================================================
--- net/third_party/nss/ssl/ssl3con.c	(revision 107268)
+++ net/third_party/nss/ssl/ssl3con.c	(working copy)
@@ -2321,8 +2321,6 @@
 {
     PRInt32   totalSent	= 0;
     PRInt32   discarded = 0;
-    PRBool    isBlockCipher;
-    int       recordIndex;
 
     PORT_Assert( ss->opt.noLocks || ssl_HaveXmitBufLock(ss) );
     if (len < 0 || !in) {
@@ -2347,12 +2345,7 @@
 	len--;
 	discarded = 1;
     }
-
-    ssl_GetSpecReadLock(ss);
-    isBlockCipher = ss->ssl3.cwSpec->cipher_def->type == type_block;
-    ssl_ReleaseSpecReadLock(ss);
-
-    for (recordIndex = 0; len > totalSent; recordIndex++) {
+    while (len > totalSent) {
 	PRInt32   sent, toSend;
 
 	if (totalSent > 0) {
@@ -2367,28 +2360,6 @@
 	    ssl_GetXmitBufLock(ss);
 	}
 	toSend = PR_MIN(len - totalSent, MAX_FRAGMENT_LENGTH);
-	if (isBlockCipher &&
-	    ss->ssl3.cwSpec->version <= SSL_LIBRARY_VERSION_3_1_TLS) {
-	    /*
-	     * We assume that block ciphers are used in CBC mode and send
-	     * only one byte in the first record.  This effectively
-	     * randomizes the IV in a backward compatible way.
-	     *
-	     * We get back to the MAX_FRAGMENT_LENGTH record boundary in
-	     * the second record.  So for a large amount of data, we send
-	     *     1
-	     *     MAX_FRAGMENT_LENGTH - 1
-	     *     MAX_FRAGMENT_LENGTH
-	     *     MAX_FRAGMENT_LENGTH
-	     *     ...
-	     */
-	    if (recordIndex == 0) {
-		toSend = 1;
-	    } else if (recordIndex == 1 &&
-		       len - totalSent > MAX_FRAGMENT_LENGTH) {
-		toSend--;
-	    }
-	}
 	sent = ssl3_SendRecord(ss, content_application_data, 
 	                       in + totalSent, toSend, flags);
 	if (sent < 0) {