Avoid some shadowed variable names.

[openssl.git] / ssl / s3_enc.c

diff --git a/ssl/s3_enc.c b/ssl/s3_enc.c
index 2bb5be49f184fc669fa44ad1cc7e7665b4ad77e4..5d133eef14f08132b951ccf8fa60a8b4dc5937af 100644 (file)
--- a/ssl/s3_enc.c
+++ b/ssl/s3_enc.c
@@ -110,8 +110,8 @@
  */
 
 #include <stdio.h>
-#include <openssl/evp.h>
 #include "ssl_locl.h"
+#include <openssl/evp.h>
 #include <openssl/md5.h>
 
 static unsigned char ssl3_pad_1[48]={
@@ -139,7 +139,7 @@ static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
        EVP_MD_CTX s1;
        unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
        unsigned char c='A';
-       int i,j,k;
+       unsigned int i,j,k;
 
 #ifdef CHARSET_EBCDIC
        c = os_toascii[c]; /*'A' in ASCII */
@@ -147,7 +147,7 @@ static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
        k=0;
        EVP_MD_CTX_init(&m5);
        EVP_MD_CTX_init(&s1);
-       for (i=0; i<num; i+=MD5_DIGEST_LENGTH)
+       for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
                {
                k++;
                if (k > sizeof buf)
@@ -172,7 +172,7 @@ static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
                EVP_DigestUpdate(&m5,s->session->master_key,
                        s->session->master_key_length);
                EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
-               if ((i+MD5_DIGEST_LENGTH) > num)
+               if ((int)(i+MD5_DIGEST_LENGTH) > num)
                        {
                        EVP_DigestFinal_ex(&m5,smd,NULL);
                        memcpy(km,smd,(num-i));
@@ -182,7 +182,7 @@ static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
 
                km+=MD5_DIGEST_LENGTH;
                }
-       memset(smd,0,SHA_DIGEST_LENGTH);
+       OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
        EVP_MD_CTX_cleanup(&m5);
        EVP_MD_CTX_cleanup(&s1);
        return 1;
@@ -192,17 +192,17 @@ int ssl3_change_cipher_state(SSL *s, int which)
        {
        unsigned char *p,*key_block,*mac_secret;
        unsigned char exp_key[EVP_MAX_KEY_LENGTH];
-       unsigned char exp_iv[EVP_MAX_KEY_LENGTH];
+       unsigned char exp_iv[EVP_MAX_IV_LENGTH];
        unsigned char *ms,*key,*iv,*er1,*er2;
        EVP_CIPHER_CTX *dd;
        const EVP_CIPHER *c;
        COMP_METHOD *comp;
        const EVP_MD *m;
        EVP_MD_CTX md;
-       int exp,n,i,j,k,cl;
+       int is_exp,n,i,j,k,cl;
        int reuse_dd = 0;
 
-       exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
+       is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
        c=s->s3->tmp.new_sym_enc;
        m=s->s3->tmp.new_hash;
        if (s->s3->tmp.new_compression == NULL)
@@ -276,9 +276,9 @@ int ssl3_change_cipher_state(SSL *s, int which)
        p=s->s3->tmp.key_block;
        i=EVP_MD_size(m);
        cl=EVP_CIPHER_key_length(c);
-       j=exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
+       j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
                 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
-       /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
+       /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
        k=EVP_CIPHER_iv_length(c);
        if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
                (which == SSL3_CHANGE_CIPHER_SERVER_READ))
@@ -307,7 +307,7 @@ int ssl3_change_cipher_state(SSL *s, int which)
 
        EVP_MD_CTX_init(&md);
        memcpy(mac_secret,ms,i);
-       if (exp)
+       if (is_exp)
                {
                /* In here I set both the read and write key/iv to the
                 * same value since only the correct one will be used :-).
@@ -333,8 +333,8 @@ int ssl3_change_cipher_state(SSL *s, int which)
 
        EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 
-       memset(&(exp_key[0]),0,sizeof(exp_key));
-       memset(&(exp_iv[0]),0,sizeof(exp_iv));
+       OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
+       OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
        EVP_MD_CTX_cleanup(&md);
        return(1);
 err:
@@ -408,7 +408,7 @@ void ssl3_cleanup_key_block(SSL *s)
        {
        if (s->s3->tmp.key_block != NULL)
                {
-               memset(s->s3->tmp.key_block,0,
+               OPENSSL_cleanse(s->s3->tmp.key_block,
                        s->s3->tmp.key_block_length);
                OPENSSL_free(s->s3->tmp.key_block);
                s->s3->tmp.key_block=NULL;
@@ -474,6 +474,7 @@ int ssl3_enc(SSL *s, int send)
                                ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
                                return 0;
                                }
+                       /* otherwise, rec->length >= bs */
                        }
                
                EVP_Cipher(ds,rec->data,rec->input,l);
@@ -482,7 +483,7 @@ int ssl3_enc(SSL *s, int send)
                        {
                        i=rec->data[l-1]+1;
                        /* SSL 3.0 bounds the number of padding bytes by the block size;
-                        * padding bytes (except that last) are arbitrary */
+                        * padding bytes (except the last one) are arbitrary */
                        if (i > bs)
                                {
                                /* Incorrect padding. SSLerr() and ssl3_alert are done
@@ -491,6 +492,7 @@ int ssl3_enc(SSL *s, int send)
                                 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
                                return -1;
                                }
+                       /* now i <= bs <= rec->length */
                        rec->length-=i;
                        }
                }