Re: [PATCH] Use sizeof() to pass buffer size to cleanser

[Bob Beck]

Looks good, but if you chase something like this, it's ok to send a
diff that kills all of them at once in the same file, like this. which
replaces everywhere the original author didn't know about sizeof(buf)
:)

-Bob



Index: n_pkey.c
===================================================================
RCS file: /cvs/src/lib/libssl/src/crypto/asn1/n_pkey.c,v
retrieving revision 1.15
diff -u -p -u -p -r1.15 n_pkey.c
--- n_pkey.c    21 Apr 2014 11:37:41 -0000      1.15
+++ n_pkey.c    23 Apr 2014 04:14:39 -0000
@@ -189,7 +189,7 @@ i2d_RSA_NET(const RSA *a, unsigned char 
 
        if (cb == NULL)
                cb = EVP_read_pw_string;
-       i = cb((char *)buf, 256, "Enter Private Key password:", 1);
+       i = cb((char *)buf, sizeof(buf), "Enter Private Key password:", 1);
        if (i != 0) {
                ASN1err(ASN1_F_I2D_RSA_NET, ASN1_R_BAD_PASSWORD_READ);
                goto err;
@@ -205,7 +205,7 @@ i2d_RSA_NET(const RSA *a, unsigned char 
 
        if (!EVP_BytesToKey(EVP_rc4(), EVP_md5(), NULL, buf, i,1, key, NULL))
                goto err;
-       OPENSSL_cleanse(buf, 256);
+       OPENSSL_cleanse(buf, sizeof(buf));
 
        /* Encrypt private key in place */
        zz = enckey->enckey->digest->data;
@@ -286,7 +286,7 @@ d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING
        EVP_CIPHER_CTX ctx;
        EVP_CIPHER_CTX_init(&ctx);
 
-       i=cb((char *)buf,256, "Enter Private Key password:",0);
+       i=cb((char *)buf, sizeof(buf), "Enter Private Key password:",0);
        if (i != 0) {
                ASN1err(ASN1_F_D2I_RSA_NET_2, ASN1_R_BAD_PASSWORD_READ);
                goto err;
@@ -302,7 +302,7 @@ d2i_RSA_NET_2(RSA **a, ASN1_OCTET_STRING
 
        if (!EVP_BytesToKey(EVP_rc4(), EVP_md5(), NULL, buf, i,1, key, NULL))
                goto err;
-       OPENSSL_cleanse(buf, 256);
+       OPENSSL_cleanse(buf, sizeof(buf));
 
        if (!EVP_DecryptInit_ex(&ctx, EVP_rc4(), NULL, key, NULL))
                goto err;