Add CRYPTO_secure_zalloc

Also turn B<foo> into foo() in the pod page.
Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

crypto/mem_sec.c

@@ -110,6 +110,15 @@ void *CRYPTO_secure_malloc(size_t num, const char *file, int line)
 #endif /* IMPLEMENTED */
 }
 
+void *CRYPTO_secure_zalloc(size_t num, const char *file, int line)
+{
+    void *ret = CRYPTO_secure_malloc(num, file, line);
+
+    if (ret != NULL)
+        memset(ret, 0, num);
+    return ret;
+}
+
 void CRYPTO_secure_free(void *ptr)
 {
 #ifdef IMPLEMENTED

doc/crypto/OPENSSL_secure_malloc.pod

@@ -2,8 +2,11 @@
 
 =head1 NAME
 
-CRYPTO_secure_malloc_init, CRYPTO_secure_malloc_done, OPENSSL_secure_malloc,
-OPENSSL_secure_free, OPENSSL_secure_allocated - secure heap storage
+CRYPTO_secure_malloc_init, CRYPTO_secure_malloc_initialized,
+CRYPTO_secure_malloc_done, OPENSSL_secure_malloc, CRYPTO_secure_malloc,
+OPENSSL_secure_zalloc, CRYPTO_secure_zalloc, OPENSSL_secure_free,
+CRYPTO_secure_free, OPENSSL_secure_actual_size, OPENSSL_secure_allocated,
+CYRPTO_secure_malloc_used - secure heap storage
 
 =head1 SYNOPSIS
 
@@ -18,6 +21,9 @@ OPENSSL_secure_free, OPENSSL_secure_allocated - secure heap storage
  void *OPENSSL_secure_malloc(int num);
  void *CRYPTO_secure_malloc(int num, const char *file, int line);
 
+ void *OPENSSL_secure_zalloc(int num);
+ void *CRYPTO_secure_zalloc(int num, const char *file, int line);
+
  void OPENSSL_secure_free(void* ptr);
  void CRYPTO_secure_free(void *ptr);
 
@@ -40,58 +46,63 @@ If a secure heap is used, then private key B<BIGNUM> values are stored there.
 This protects long-term storage of private keys, but will not necessarily
 put all intermediate values and computations there.
 
-B<CRYPTO_secure_malloc_init> creates the secure heap, with the specified
+CRYPTO_secure_malloc_init() creates the secure heap, with the specified
 C<size> in bytes. The C<minsize> parameter is the minimum size to
 allocate from the heap. Both C<size> and C<minsize> must be a power
-of two.  It is an error to call this after any B<OPENSSL_secure_malloc>
+of two.  It is an error to call this after any OPENSSL_secure_malloc()
 calls have been made.
 
-B<CRYPTO_secure_malloc_initialized> indicates whether or not the secure
+CRYPTO_secure_malloc_initialized() indicates whether or not the secure
 heap as been initialized and is available.
 
-B<CRYPTO_secure_malloc_done> releases the heap and makes the memory unavailable
+CRYPTO_secure_malloc_done() releases the heap and makes the memory unavailable
 to the process. It can take noticeably long to complete.
 
-B<OPENSSL_secure_malloc> allocates C<num> bytes from the heap.
-If B<CRYPTO_secure_malloc_init> is not called, this is equivalent to
-calling B<OPENSSL_malloc>.
+OPENSSL_secure_malloc() allocates C<num> bytes from the heap.
+If CRYPTO_secure_malloc_init() is not called, this is equivalent to
+calling OPENSSL_malloc().
 It is a macro that expands to
-B<CRYPTO_secure_malloc> and adds the B<__FILE__> and B<__LINE__> parameters.
+CRYPTO_secure_malloc() and adds the C<__FILE__> and C<__LINE__> parameters.
+
+OPENSSL_secure_zalloc() and CRYPTO_secure_zalloc() are like
+OPENSSL_secure_malloc() and CRYPTO_secure_malloc(), respectively,
+except that they call memset() to zero the memory before returning.
 
-B<OPENSSL_secure_free> releases the memory at C<ptr> back to the heap.
+OPENSSL_secure_free() releases the memory at C<ptr> back to the heap.
 It must be called with a value previously obtained from
-B<OPENSSL_secure_malloc>.
-If B<CRYPTO_secure_malloc_init> is not called, this is equivalent to
-calling B<OPENSSL_free>.
-It exists for consistency with B<OPENSSL_secure_malloc> , and
-is a macro that expands to B<CRYPTO_secure_free>.
+OPENSSL_secure_malloc().
+If CRYPTO_secure_malloc_init() is not called, this is equivalent to
+calling OPENSSL_free().
+It exists for consistency with OPENSSL_secure_malloc() , and
+is a macro that expands to CRYPTO_secure_free().
 
-B<OPENSSL_secure_allocated> tells whether or not a pointer is within
+OPENSSL_secure_allocated() tells whether or not a pointer is within
 the secure heap.
-B<OPENSSL_secure_actual_size> tells the actual size allocated to the
+OPENSSL_secure_actual_size() tells the actual size allocated to the
 pointer; implementations may allocate more space than initially
 requested, in order to "round up" and reduce secure heap fragmentation.
 
-B<CRYPTO_secure_malloc_used> returns the number of bytes allocated in the
+CRYPTO_secure_malloc_used() returns the number of bytes allocated in the
 secure heap.
 
 =head1 RETURN VALUES
 
-B<CRYPTO_secure_malloc_init> returns 0 on failure, 1 if successful,
+CRYPTO_secure_malloc_init() returns 0 on failure, 1 if successful,
 and 2 if successful but the heap could not be protected by memory
 mapping.
 
-B<CRYPTO_secure_malloc_initialized> returns 1 if the secure heap is
-available (that is, if B<CRYPTO_secure_malloc_init> has been called,
-but B<CRYPTO_secure_malloc_done> has not) or 0 if not.
+CRYPTO_secure_malloc_initialized() returns 1 if the secure heap is
+available (that is, if CRYPTO_secure_malloc_init() has been called,
+but CRYPTO_secure_malloc_done() has not) or 0 if not.
 
-B<OPENSSL_secure_malloc> returns a pointer into the secure heap of
-the requested size, or C<NULL> if memory could not be allocated.
+OPENSSL_secure_malloc() and OPENSSL_secure_zalloc() return a pointer into
+the secure heap of the requested size, or C<NULL> if memory could not be
+allocated.
 
-B<CRYPTO_secure_allocated> returns 1 if the pointer is in the
+CRYPTO_secure_allocated() returns 1 if the pointer is in the
 the secure heap, or 0 if not.
 
-B<CRYPTO_secure_malloc_done> and B<OPENSSL_secure_free>
+CRYPTO_secure_malloc_done() and OPENSSL_secure_free()
 return no values.
 
 =head1 BUGS

include/openssl/crypto.h

@@ -312,6 +312,8 @@ int CRYPTO_mem_ctrl(int mode);
         CRYPTO_strndup(str, n, __FILE__, __LINE__)
 #  define OPENSSL_secure_malloc(num) \
         CRYPTO_secure_malloc(num, __FILE__, __LINE__)
+#  define OPENSSL_secure_zalloc(num) \
+        CRYPTO_secure_zalloc(num, __FILE__, __LINE__)
 #  define OPENSSL_secure_free(addr) \
         CRYPTO_secure_free(addr)
 #  define OPENSSL_secure_actual_size(ptr) \
@@ -337,6 +339,8 @@ int CRYPTO_mem_ctrl(int mode);
         CRYPTO_strndup(str, s, NULL, 0)
 #  define OPENSSL_secure_malloc(num) \
         CRYPTO_secure_malloc(num, NULL, 0)
+#  define OPENSSL_secure_zalloc(num) \
+        CRYPTO_secure_zalloc(num, NULL, 0)
 #  define OPENSSL_secure_free(addr) \
         CRYPTO_secure_free(addr)
 #  define OPENSSL_secure_actual_size(ptr) \
@@ -478,6 +482,7 @@ void *CRYPTO_clear_realloc(void *addr, size_t old_num, size_t num,
 int CRYPTO_secure_malloc_init(size_t sz, int minsize);
 void CRYPTO_secure_malloc_done(void);
 void *CRYPTO_secure_malloc(size_t num, const char *file, int line);
+void *CRYPTO_secure_zalloc(size_t num, const char *file, int line);
 void CRYPTO_secure_free(void *ptr);
 int CRYPTO_secure_allocated(const void *ptr);
 int CRYPTO_secure_malloc_initialized(void);

util/libeay.num

@@ -4764,3 +4764,4 @@ TS_STATUS_INFO_get0_status              5158	1_1_0	EXIST::FUNCTION:
 OCSP_resp_get0_produced_at              5159	1_1_0	EXIST::FUNCTION:
 TS_STATUS_INFO_get0_failure_info        5160	1_1_0	EXIST::FUNCTION:
 TS_STATUS_INFO_get0_text                5161	1_1_0	EXIST::FUNCTION:
+CRYPTO_secure_zalloc                    5162	1_1_0	EXIST::FUNCTION: