#ifndef OPENSSL_NO_SHA
+#define OPENSSL_FIPSAPI
+
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/evp.h>
#include <openssl/bn.h>
#include <openssl/rand.h>
#include <openssl/sha.h>
+#ifdef OPENSSL_FIPS
+#include <openssl/fips.h>
+#include <openssl/fips_rand.h>
+#endif
+
#include "dsa_locl.h"
int DSA_generate_parameters_ex(DSA *ret, int bits,
- unsigned char *seed_in, int seed_len,
+ const unsigned char *seed_in, int seed_len,
int *counter_ret, unsigned long *h_ret, BN_GENCB *cb)
{
if(ret->meth->dsa_paramgen)
}
return dsa_builtin_paramgen(ret, bits, qbits, evpmd,
- seed_in, seed_len, counter_ret, h_ret, cb);
+ seed_in, seed_len, NULL, counter_ret, h_ret, cb);
}
}
int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
- const EVP_MD *evpmd, unsigned char *seed_in, size_t seed_len,
+ const EVP_MD *evpmd, const unsigned char *seed_in, size_t seed_len,
+ unsigned char *seed_out,
int *counter_ret, unsigned long *h_ret, BN_GENCB *cb)
{
int ok=0;
BIGNUM *r0,*W,*X,*c,*test;
BIGNUM *g=NULL,*q=NULL,*p=NULL;
BN_MONT_CTX *mont=NULL;
- int i, k,n=0,b,m=0, qsize = qbits >> 3;
+ int i, k, n=0, m=0, qsize = qbits >> 3;
int counter=0;
int r=0;
BN_CTX *ctx=NULL;
unsigned int h=2;
+#ifdef OPENSSL_FIPS
+ if(FIPS_selftest_failed())
+ {
+ FIPSerr(FIPS_F_DSA_BUILTIN_PARAMGEN, FIPS_R_FIPS_SELFTEST_FAILED);
+ goto err;
+ }
+
+ 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;
+ }
+#endif
+
if (qsize != SHA_DIGEST_LENGTH && qsize != SHA224_DIGEST_LENGTH &&
qsize != SHA256_DIGEST_LENGTH)
/* invalid q size */
bits = (bits+63)/64*64;
- if (seed_len < (size_t)qsize)
+ /* NB: seed_len == 0 is special case: copy generated seed to
+ * seed_in if it is not NULL.
+ */
+ if (seed_len && (seed_len < (size_t)qsize))
seed_in = NULL; /* seed buffer too small -- ignore */
if (seed_len > (size_t)qsize)
seed_len = qsize; /* App. 2.2 of FIPS PUB 186 allows larger SEED,
if (!seed_len)
{
- RAND_pseudo_bytes(seed, qsize);
+ if (RAND_pseudo_bytes(seed, qsize) < 0)
+ goto err;
seed_is_random = 1;
}
else
}
/* step 2 */
- EVP_Digest(seed, qsize, md, NULL, evpmd, NULL);
- EVP_Digest(buf, qsize, buf2, NULL, evpmd, NULL);
+ if (!EVP_Digest(seed, qsize, md, NULL, evpmd, NULL))
+ goto err;
+ if (!EVP_Digest(buf, qsize, buf2, NULL, evpmd, NULL))
+ goto err;
for (i = 0; i < qsize; i++)
md[i]^=buf2[i];
/* "offset = 2" */
n=(bits-1)/160;
- b=(bits-1)-n*160;
for (;;)
{
break;
}
- EVP_Digest(buf, qsize, md ,NULL, evpmd, NULL);
+ if (!EVP_Digest(buf, qsize, md ,NULL, evpmd,
+ NULL))
+ goto err;
/* step 8 */
if (!BN_bin2bn(md, qsize, r0))
ok=0;
goto err;
}
- if ((m > 1) && (seed_in != NULL)) memcpy(seed_in,seed, qsize);
+ if (counter_ret != NULL) *counter_ret=counter;
+ if (h_ret != NULL) *h_ret=h;
+ if (seed_out)
+ memcpy(seed_out, seed, qsize);
+ }
+ if(ctx)
+ {
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ }
+ if (mont != NULL) BN_MONT_CTX_free(mont);
+ return ok;
+ }
+
+#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_valid_parameters(size_t L, size_t N)
+ {
+ if (L == 1024 && N == 160)
+ return 80;
+ if (L == 2048 && N == 224)
+ return 112;
+ if (L == 2048 && N == 256)
+ 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,
+ int idx, unsigned char *seed_out,
+ int *counter_ret, unsigned long *h_ret, BN_GENCB *cb)
+ {
+ int ok=-1;
+ unsigned char *seed = NULL, *seed_tmp = NULL;
+ unsigned char md[EVP_MAX_MD_SIZE];
+ int mdsize;
+ BIGNUM *r0,*W,*X,*c,*test;
+ BIGNUM *g=NULL,*q=NULL,*p=NULL;
+ BN_MONT_CTX *mont=NULL;
+ int i, k, n=0, m=0, qsize = N >> 3;
+ 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())
+ {
+ FIPSerr(FIPS_F_DSA_BUILTIN_PARAMGEN2,
+ FIPS_R_FIPS_SELFTEST_FAILED);
+ goto err;
+ }
+
+ if (!fips_check_dsa_prng(ret, L, N))
+ goto err;
+#endif
+
+ if (evpmd == NULL)
+ {
+ if (N == 160)
+ evpmd = EVP_sha1();
+ else if (N == 224)
+ evpmd = EVP_sha224();
+ else
+ evpmd = EVP_sha256();
+ }
+
+ 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;
+
+ seed = OPENSSL_malloc(seed_len);
+
+ if (seed_out)
+ seed_tmp = seed_out;
+ else
+ seed_tmp = OPENSSL_malloc(seed_len);
+
+ if (!seed || !seed_tmp)
+ goto err;
+
+ if (seed_in)
+ memcpy(seed, seed_in, seed_len);
+
+ }
+
+ if ((ctx=BN_CTX_new()) == NULL)
+ goto err;
+
+ if ((mont=BN_MONT_CTX_new()) == NULL)
+ goto err;
+
+ BN_CTX_start(ctx);
+ r0 = BN_CTX_get(ctx);
+ g = BN_CTX_get(ctx);
+ W = BN_CTX_get(ctx);
+ X = BN_CTX_get(ctx);
+ c = 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 (;;)
+ {
+ for (;;) /* find q */
+ {
+ unsigned char *pmd;
+ /* step 1 */
+ if(!BN_GENCB_call(cb, 0, m++))
+ goto err;
+
+ if (!seed_in)
+ {
+ if (RAND_pseudo_bytes(seed, seed_len) < 0)
+ goto err;
+ }
+ /* step 2 */
+ if (!EVP_Digest(seed, seed_len, md, NULL, evpmd, NULL))
+ goto err;
+ /* Take least significant bits of md */
+ if (mdsize > qsize)
+ pmd = md + mdsize - qsize;
+ else
+ pmd = md;
+
+ if (mdsize < qsize)
+ memset(md + mdsize, 0, qsize - mdsize);
+
+ /* step 3 */
+ pmd[0] |= 0x80;
+ pmd[qsize-1] |= 0x01;
+ if (!BN_bin2bn(pmd, qsize, q))
+ goto err;
+
+ /* step 4 */
+ r = BN_is_prime_fasttest_ex(q, DSS_prime_checks, ctx,
+ seed_in ? 1 : 0, cb);
+ if (r > 0)
+ break;
+ if (r != 0)
+ goto err;
+ /* Provided seed didn't produce a prime: error */
+ if (seed_in)
+ {
+ ok = 0;
+ DSAerr(DSA_F_DSA_BUILTIN_PARAMGEN2, DSA_R_Q_NOT_PRIME);
+ 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;
+
+ /* step 6 */
+ counter=0;
+ /* "offset = 1" */
+
+ n=(L-1)/(mdsize << 3);
+
+ for (;;)
+ {
+ if ((counter != 0) && !BN_GENCB_call(cb, 0, counter))
+ goto err;
+
+ /* step 7 */
+ BN_zero(W);
+ /* now 'buf' contains "SEED + offset - 1" */
+ for (k=0; k<=n; k++)
+ {
+ /* obtain "SEED + offset + k" by incrementing: */
+ for (i = seed_len-1; i >= 0; i--)
+ {
+ seed[i]++;
+ if (seed[i] != 0)
+ break;
+ }
+
+ if (!EVP_Digest(seed, seed_len, md ,NULL, evpmd,
+ NULL))
+ goto err;
+
+ /* step 8 */
+ if (!BN_bin2bn(md, mdsize, r0))
+ goto err;
+ if (!BN_lshift(r0,r0,(mdsize << 3)*k)) goto err;
+ if (!BN_add(W,W,r0)) goto err;
+ }
+
+ /* more of step 8 */
+ if (!BN_mask_bits(W,L-1)) goto err;
+ if (!BN_copy(X,W)) goto err;
+ if (!BN_add(X,X,test)) goto err;
+
+ /* step 9 */
+ if (!BN_lshift1(r0,q)) goto err;
+ if (!BN_mod(c,X,r0,ctx)) goto err;
+ if (!BN_sub(r0,c,BN_value_one())) goto err;
+ if (!BN_sub(p,X,r0)) goto err;
+
+ /* step 10 */
+ if (BN_cmp(p,test) >= 0)
+ {
+ /* step 11 */
+ r = BN_is_prime_fasttest_ex(p, DSS_prime_checks,
+ ctx, 1, cb);
+ if (r > 0)
+ goto end; /* found it */
+ if (r != 0)
+ goto err;
+ }
+
+ /* step 13 */
+ counter++;
+ /* "offset = offset + n + 1" */
+
+ /* step 14 */
+ 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 (idx < 0)
+ {
+ if (!BN_set_word(test,h))
+ goto err;
+ }
+ else
+ h = 1;
+ if (!BN_MONT_CTX_set(mont,p,ctx)) goto err;
+
+ for (;;)
+ {
+ 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 (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))
+ goto err;
+
+ ok=1;
+err:
+ if (ok == 1)
+ {
+ 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->g=BN_dup(g);
+ if (ret->p == NULL || ret->q == NULL || ret->g == NULL)
+ {
+ ok=-1;
+ goto err;
+ }
if (counter_ret != NULL) *counter_ret=counter;
if (h_ret != NULL) *h_ret=h;
}
+ 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