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Improved error checking for DRBG calls.

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New functionality to allow default DRBG type to be set during compilation or during runtime.
This commit is contained in:
Dr. Stephen Henson 2011-09-16 23:12:34 +00:00
parent 0ae7c43fa5
commit 36f120cd20
3 changed files with 34 additions and 2 deletions
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4
crypto/rand/rand.h
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@ -120,6 +120,7 @@ int RAND_event(UINT, WPARAM, LPARAM);
#endif
#ifdef OPENSSL_FIPS
void RAND_set_fips_drbg_type(int type, int flags);
int RAND_init_fips(void);
#endif
@ -133,9 +134,12 @@ void ERR_load_RAND_strings(void);
/* Function codes. */
#define RAND_F_RAND_GET_RAND_METHOD 101
#define RAND_F_RAND_INIT_FIPS 102
#define RAND_F_SSLEAY_RAND_BYTES 100
/* Reason codes. */
#define RAND_R_ERROR_INITIALISING_DRBG 102
#define RAND_R_ERROR_INSTANTIATING_DRBG 103
#define RAND_R_NO_FIPS_RANDOM_METHOD_SET 101
#define RAND_R_PRNG_NOT_SEEDED 100

3
crypto/rand/rand_err.c
View File

@ -71,12 +71,15 @@
static ERR_STRING_DATA RAND_str_functs[]=
{
{ERR_FUNC(RAND_F_RAND_GET_RAND_METHOD), "RAND_get_rand_method"},
{ERR_FUNC(RAND_F_RAND_INIT_FIPS), "RAND_init_fips"},
{ERR_FUNC(RAND_F_SSLEAY_RAND_BYTES), "SSLEAY_RAND_BYTES"},
{0,NULL}
};
static ERR_STRING_DATA RAND_str_reasons[]=
{
{ERR_REASON(RAND_R_ERROR_INITIALISING_DRBG),"error initialising drbg"},
{ERR_REASON(RAND_R_ERROR_INSTANTIATING_DRBG),"error instantiating drbg"},
{ERR_REASON(RAND_R_NO_FIPS_RANDOM_METHOD_SET),"no fips random method set"},
{ERR_REASON(RAND_R_PRNG_NOT_SEEDED) ,"PRNG not seeded"},
{0,NULL}

29
crypto/rand/rand_lib.c
View File

@ -245,13 +245,34 @@ static int drbg_rand_seed(DRBG_CTX *ctx, const void *in, int inlen)
return 1;
}
#ifndef OPENSSL_DRBG_DEFAULT_TYPE
#define OPENSSL_DRBG_DEFAULT_TYPE NID_aes_256_ctr
#endif
#ifndef OPENSSL_DRBG_DEFAULT_FLAGS
#define OPENSSL_DRBG_DEFAULT_FLAGS DRBG_FLAG_CTR_USE_DF
#endif
static int fips_drbg_type = OPENSSL_DRBG_DEFAULT_TYPE;
static int fips_drbg_flags = OPENSSL_DRBG_DEFAULT_FLAGS;
void RAND_set_fips_drbg_type(int type, int flags)
{
fips_drbg_type = type;
fips_drbg_flags = flags;
}
int RAND_init_fips(void)
{
DRBG_CTX *dctx;
size_t plen;
unsigned char pers[32], *p;
dctx = FIPS_get_default_drbg();
FIPS_drbg_init(dctx, NID_aes_256_ctr, DRBG_FLAG_CTR_USE_DF);
if (FIPS_drbg_init(dctx, fips_drbg_type, fips_drbg_flags) <= 0)
{
RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INITIALISING_DRBG);
return 0;
}
FIPS_drbg_set_callbacks(dctx,
drbg_get_entropy, drbg_free_entropy, 20,
drbg_get_entropy, drbg_free_entropy);
@ -262,7 +283,11 @@ int RAND_init_fips(void)
plen = drbg_get_adin(dctx, &p);
memcpy(pers + 16, p, plen);
FIPS_drbg_instantiate(dctx, pers, sizeof(pers));
if (FIPS_drbg_instantiate(dctx, pers, sizeof(pers)) <= 0)
{
RANDerr(RAND_F_RAND_INIT_FIPS, RAND_R_ERROR_INSTANTIATING_DRBG);
return 0;
}
FIPS_rand_set_method(FIPS_drbg_method());
return 1;
}