#include "cryptlib.h"
#include <openssl/buffer.h>
+/* LIMIT_BEFORE_EXPANSION is the maximum n such that (n+3)/3*4 < 2**31. That
+ * function is applied in several functions in this file and this limit ensures
+ * that the result fits in an int. */
+#define LIMIT_BEFORE_EXPANSION 0x5ffffffc
+
BUF_MEM *BUF_MEM_new(void)
{
BUF_MEM *ret;
OPENSSL_free(a);
}
-int BUF_MEM_grow(BUF_MEM *str, int len)
+int BUF_MEM_grow(BUF_MEM *str, size_t len)
{
char *ret;
- unsigned int n;
+ size_t n;
if (str->length >= len)
{
str->length=len;
return(len);
}
+ /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
+ if (len > LIMIT_BEFORE_EXPANSION)
+ {
+ BUFerr(BUF_F_BUF_MEM_GROW,ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
n=(len+3)/3*4;
if (str->data == NULL)
ret=OPENSSL_malloc(n);
return(len);
}
-char *BUF_strdup(const char *str)
+int BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
{
char *ret;
- int n;
-
- if (str == NULL) return(NULL);
+ size_t n;
- n=strlen(str);
- ret=OPENSSL_malloc(n+1);
- if (ret == NULL)
+ if (str->length >= len)
{
- BUFerr(BUF_F_BUF_STRDUP,ERR_R_MALLOC_FAILURE);
- return(NULL);
+ memset(&str->data[len],0,str->length-len);
+ str->length=len;
+ return(len);
}
- memcpy(ret,str,n+1);
- return(ret);
+ if (str->max >= len)
+ {
+ memset(&str->data[str->length],0,len-str->length);
+ str->length=len;
+ return(len);
+ }
+ /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
+ if (len > LIMIT_BEFORE_EXPANSION)
+ {
+ BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ n=(len+3)/3*4;
+ if (str->data == NULL)
+ ret=OPENSSL_malloc(n);
+ else
+ ret=OPENSSL_realloc_clean(str->data,str->max,n);
+ if (ret == NULL)
+ {
+ BUFerr(BUF_F_BUF_MEM_GROW_CLEAN,ERR_R_MALLOC_FAILURE);
+ len=0;
+ }
+ else
+ {
+ str->data=ret;
+ str->max=n;
+ memset(&str->data[str->length],0,len-str->length);
+ str->length=len;
+ }
+ return(len);
}
+void BUF_reverse(unsigned char *out, unsigned char *in, size_t size)
+ {
+ size_t i;
+ if (in)
+ {
+ out += size - 1;
+ for (i = 0; i < size; i++)
+ *out-- = *in++;
+ }
+ else
+ {
+ unsigned char *q;
+ char c;
+ q = out + size - 1;
+ for (i = 0; i < size/2; i++)
+ {
+ c = *q;
+ *q-- = *out;
+ *out++ = c;
+ }
+ }
+ }