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Fix to allow disabling P-RNG and SHA256 when CUSTOM_RAND_GENERATE_BLOCK is used. Added inline documentation to describe RNG source options. Example: ./configure --enable-cryptonly --disable-hashdrbg CFLAGS="-DNO_SHA256 -DCUSTOM_RAND_GENERATE_BLOCK"

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This commit is contained in:
David Garske
2016-09-06 16:42:53 -07:00
parent 33f24ebaa8
commit 8d6ea61a4f
1 changed files with 20 additions and 3 deletions
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23
wolfssl/wolfcrypt/random.h
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@ -39,18 +39,35 @@
#define RNG_MAX_BLOCK_LEN (0x10000)
#ifndef HAVE_FIPS /* avoid redefining structs and macros */
#if defined(WOLFSSL_FORCE_RC4_DRBG) && defined(NO_RC4)
#error Cannot have WOLFSSL_FORCE_RC4_DRBG and NO_RC4 defined.
#endif /* WOLFSSL_FORCE_RC4_DRBG && NO_RC4 */
#if defined(HAVE_HASHDRBG) || defined(NO_RC4)
/* RNG supports the following sources (in order):
* 1. CUSTOM_RAND_GENERATE_BLOCK: Defines name of function as RNG source and
* bypasses the P-RNG.
* 2. HAVE_HASHDRBG && !SHA256 (default). Uses SHA256 based P-RNG
* seeded via wc_GenerateSeed.
* 3. !HAVE_HASHDRBG && RC4 enabled. Uses RC4
*/
#if defined(CUSTOM_RAND_GENERATE_BLOCK)
/* To use define the following:
* #define CUSTOM_RAND_GENERATE_BLOCK myRngFunc
* extern int myRngFunc(byte* output, word32 sz);
*/
#elif (defined(HAVE_HASHDRBG) || defined(NO_RC4))
#ifdef NO_SHA256
#error "Hash DRBG requires SHA-256."
#endif /* NO_SHA256 */
#include <wolfssl/wolfcrypt/sha256.h>
#else /* HAVE_HASHDRBG || NO_RC4 */
#else
#include <wolfssl/wolfcrypt/arc4.h>
#endif /* HAVE_HASHDRBG || NO_RC4 */
#endif
#ifdef HAVE_WNR
#include <wnr.h>