#include <openssl/sha.h>
#ifdef OPENSSL_FIPS
#include <openssl/fips.h>
+#include <openssl/fips_rand.h>
#endif
#include "dsa_locl.h"
goto err;
}
- if (FIPS_mode() && (bits < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS))
+ if (FIPS_module_mode() && !(ret->flags & DSA_FLAG_NON_FIPS_ALLOW)
+ && (bits < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS))
{
DSAerr(DSA_F_DSA_BUILTIN_PARAMGEN, DSA_R_KEY_SIZE_TOO_SMALL);
goto err;
if (!seed_len)
{
- RAND_pseudo_bytes(seed, qsize);
+ if (RAND_pseudo_bytes(seed, qsize) < 0)
+ goto err;
seed_is_random = 1;
}
else
return ok;
}
-/* Permissible parameter values for (L,N): see FIPS186-3 4.2 */
+#ifdef OPENSSL_FIPS
+
+/* Security strength of parameter values for (L,N): see FIPS186-3 4.2
+ * and SP800-131A
+ */
+
+
+static int fips_ffc_strength(size_t L, size_t N)
+ {
+ if (L >= 15360 && N >= 512)
+ return 256;
+ if (L >= 7680 && N >= 384)
+ return 192;
+ if (L >= 3072 && N >= 256)
+ return 128;
+ if (L >= 2048 && N >= 224)
+ return 112;
+ if (L >= 1024 && N >= 160)
+ return 80;
+ return 0;
+ }
+
+/* Valid DSA2 parameters from FIPS 186-3 */
-static int dsa2_check_params(size_t L, size_t N)
+static int dsa2_valid_parameters(size_t L, size_t N)
{
if (L == 1024 && N == 160)
- return 1;
+ return 80;
if (L == 2048 && N == 224)
- return 1;
+ return 112;
if (L == 2048 && N == 256)
- return 1;
+ return 112;
if (L == 3072 && N == 256)
+ return 128;
+ return 0;
+ }
+
+int fips_check_dsa_prng(DSA *dsa, size_t L, size_t N)
+ {
+ int strength;
+ if (!FIPS_module_mode())
+ return 1;
+
+ if (dsa->flags & (DSA_FLAG_NON_FIPS_ALLOW|DSA_FLAG_FIPS_CHECKED))
+ return 1;
+
+ if (!L || !N)
+ {
+ L = BN_num_bits(dsa->p);
+ N = BN_num_bits(dsa->q);
+ }
+ if (!dsa2_valid_parameters(L, N))
+ {
+ FIPSerr(FIPS_F_FIPS_CHECK_DSA_PRNG, FIPS_R_INVALID_PARAMETERS);
+ return 0;
+ }
+
+ strength = fips_ffc_strength(L, N);
+
+ if (!strength)
+ {
+ FIPSerr(FIPS_F_FIPS_CHECK_DSA_PRNG,FIPS_R_KEY_TOO_SHORT);
+ return 0;
+ }
+
+ if (FIPS_rand_strength() >= strength)
return 1;
+
+ FIPSerr(FIPS_F_FIPS_CHECK_DSA_PRNG,FIPS_R_PRNG_STRENGTH_TOO_LOW);
return 0;
+
}
+#endif /* OPENSSL_FIPS */
/* This is a parameter generation algorithm for the DSA2 algorithm as
* described in FIPS 186-3.
int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
const EVP_MD *evpmd, const unsigned char *seed_in, size_t seed_len,
- unsigned char *seed_out,
+ int idx, unsigned char *seed_out,
int *counter_ret, unsigned long *h_ret, BN_GENCB *cb)
{
int ok=-1;
- unsigned char *seed = NULL;
+ unsigned char *seed = NULL, *seed_tmp = NULL;
unsigned char md[EVP_MAX_MD_SIZE];
int mdsize;
BIGNUM *r0,*W,*X,*c,*test;
int counter=0;
int r=0;
BN_CTX *ctx=NULL;
+ EVP_MD_CTX mctx;
unsigned int h=2;
+ EVP_MD_CTX_init(&mctx);
+
#ifdef OPENSSL_FIPS
if(FIPS_selftest_failed())
{
FIPS_R_FIPS_SELFTEST_FAILED);
goto err;
}
-#endif
- if (!dsa2_check_params(L, N))
- {
- DSAerr(DSA_F_DSA_BUILTIN_PARAMGEN2, DSA_R_INVALID_PARAMETERS);
- ok = 0;
+
+ if (!fips_check_dsa_prng(ret, L, N))
goto err;
- }
+#endif
if (evpmd == NULL)
{
}
mdsize = M_EVP_MD_size(evpmd);
+ /* If unverificable g generation only don't need seed */
+ if (!ret->p || !ret->q || idx >= 0)
+ {
+ if (seed_len == 0)
+ seed_len = mdsize;
- if (seed_len == 0)
- seed_len = mdsize;
+ seed = OPENSSL_malloc(seed_len);
- seed = OPENSSL_malloc(seed_len);
+ if (seed_out)
+ seed_tmp = seed_out;
+ else
+ seed_tmp = OPENSSL_malloc(seed_len);
- if (!seed)
- goto err;
+ if (!seed || !seed_tmp)
+ goto err;
- if (seed_in)
- memcpy(seed, seed_in, seed_len);
+ if (seed_in)
+ memcpy(seed, seed_in, seed_len);
+
+ }
if ((ctx=BN_CTX_new()) == NULL)
goto err;
r0 = BN_CTX_get(ctx);
g = BN_CTX_get(ctx);
W = BN_CTX_get(ctx);
- q = BN_CTX_get(ctx);
X = BN_CTX_get(ctx);
c = BN_CTX_get(ctx);
- p = BN_CTX_get(ctx);
test = BN_CTX_get(ctx);
+ /* if p, q already supplied generate g only */
+ if (ret->p && ret->q)
+ {
+ p = ret->p;
+ q = ret->q;
+ if (idx >= 0)
+ memcpy(seed_tmp, seed, seed_len);
+ goto g_only;
+ }
+ else
+ {
+ p = BN_CTX_get(ctx);
+ q = BN_CTX_get(ctx);
+ }
+
if (!BN_lshift(test,BN_value_one(),L-1))
goto err;
for (;;)
goto err;
if (!seed_in)
- RAND_pseudo_bytes(seed, qsize);
+ {
+ if (RAND_pseudo_bytes(seed, seed_len) < 0)
+ goto err;
+ }
/* step 2 */
if (!EVP_Digest(seed, seed_len, md, NULL, evpmd, NULL))
goto err;
/* do a callback call */
/* step 5 */
}
+ /* Copy seed to seed_out before we mess with it */
+ if (seed_out)
+ memcpy(seed_out, seed, seed_len);
if(!BN_GENCB_call(cb, 2, 0)) goto err;
if(!BN_GENCB_call(cb, 3, 0)) goto err;
/* "offset = offset + n + 1" */
/* step 14 */
- if (counter >= 4096) break;
+ if (counter >= (int)(4 * L)) break;
+ }
+ if (seed_in)
+ {
+ ok = 0;
+ DSAerr(DSA_F_DSA_BUILTIN_PARAMGEN2, DSA_R_INVALID_PARAMETERS);
+ goto err;
}
}
end:
if(!BN_GENCB_call(cb, 2, 1))
goto err;
+ g_only:
+
/* We now need to generate g */
/* Set r0=(p-1)/q */
if (!BN_sub(test,p,BN_value_one())) goto err;
if (!BN_div(r0,NULL,test,q,ctx)) goto err;
- if (!BN_set_word(test,h)) goto err;
+ if (idx < 0)
+ {
+ if (!BN_set_word(test,h))
+ goto err;
+ }
+ else
+ h = 1;
if (!BN_MONT_CTX_set(mont,p,ctx)) goto err;
for (;;)
{
+ __fips_constseg
+ static const unsigned char ggen[4] = {0x67,0x67,0x65,0x6e};
+ if (idx >= 0)
+ {
+ md[0] = idx & 0xff;
+ md[1] = (h >> 8) & 0xff;
+ md[2] = h & 0xff;
+ if (!EVP_DigestInit_ex(&mctx, evpmd, NULL))
+ goto err;
+ if (!EVP_DigestUpdate(&mctx, seed_tmp, seed_len))
+ goto err;
+ if (!EVP_DigestUpdate(&mctx, ggen, sizeof(ggen)))
+ goto err;
+ if (!EVP_DigestUpdate(&mctx, md, 3))
+ goto err;
+ if (!EVP_DigestFinal_ex(&mctx, md, NULL))
+ goto err;
+ if (!BN_bin2bn(md, mdsize, test))
+ goto err;
+ }
/* g=test^r0%p */
if (!BN_mod_exp_mont(g,test,r0,p,ctx,mont)) goto err;
if (!BN_is_one(g)) break;
- if (!BN_add(test,test,BN_value_one())) goto err;
+ if (idx < 0 && !BN_add(test,test,BN_value_one())) goto err;
h++;
+ if ( idx >= 0 && h > 0xffff)
+ goto err;
}
if(!BN_GENCB_call(cb, 3, 1))
ok=1;
err:
- if (ok)
+ if (ok == 1)
{
- if(ret->p) BN_free(ret->p);
- if(ret->q) BN_free(ret->q);
+ if (p != ret->p)
+ {
+ if(ret->p) BN_free(ret->p);
+ ret->p=BN_dup(p);
+ }
+ if (q != ret->q)
+ {
+ if(ret->q) BN_free(ret->q);
+ ret->q=BN_dup(q);
+ }
if(ret->g) BN_free(ret->g);
- ret->p=BN_dup(p);
- ret->q=BN_dup(q);
ret->g=BN_dup(g);
if (ret->p == NULL || ret->q == NULL || ret->g == NULL)
{
}
if (counter_ret != NULL) *counter_ret=counter;
if (h_ret != NULL) *h_ret=h;
- if (seed_out)
- memcpy(seed_out, seed, seed_len);
}
if (seed)
OPENSSL_free(seed);
+ if (seed_out != seed_tmp)
+ OPENSSL_free(seed_tmp);
if(ctx)
{
BN_CTX_end(ctx);
BN_CTX_free(ctx);
}
if (mont != NULL) BN_MONT_CTX_free(mont);
+ EVP_MD_CTX_cleanup(&mctx);
return ok;
}
+
+int dsa_paramgen_check_g(DSA *dsa)
+ {
+ BN_CTX *ctx;
+ BIGNUM *tmp;
+ BN_MONT_CTX *mont = NULL;
+ int rv = -1;
+ ctx = BN_CTX_new();
+ if (!ctx)
+ return -1;
+ BN_CTX_start(ctx);
+ if (BN_cmp(dsa->g, BN_value_one()) <= 0)
+ return 0;
+ if (BN_cmp(dsa->g, dsa->p) >= 0)
+ return 0;
+ tmp = BN_CTX_get(ctx);
+ if (!tmp)
+ goto err;
+ if ((mont=BN_MONT_CTX_new()) == NULL)
+ goto err;
+ if (!BN_MONT_CTX_set(mont,dsa->p,ctx))
+ goto err;
+ /* Work out g^q mod p */
+ if (!BN_mod_exp_mont(tmp,dsa->g,dsa->q, dsa->p, ctx, mont))
+ goto err;
+ if (!BN_cmp(tmp, BN_value_one()))
+ rv = 1;
+ else
+ rv = 0;
+ err:
+ BN_CTX_end(ctx);
+ if (mont)
+ BN_MONT_CTX_free(mont);
+ BN_CTX_free(ctx);
+ return rv;
+
+ }
+
#endif
projects / openssl.git / blobdiff