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Add support for canonical generation of DSA parameter g.

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Modify fips_dssvs to support appropriate file format.
This commit is contained in:
Dr. Stephen Henson 2011-08-26 14:51:49 +00:00
parent 7daf0efad9
commit f55f5f775e
4 changed files with 153 additions and 25 deletions
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3
CHANGES
View file

@ -4,6 +4,9 @@
Changes between 1.0.1 and 1.1.0 [xx XXX xxxx]
*) Add support for canonical generation of DSA parameter 'g'. See
FIPS 186-3 A.2.3.
*) Add support for HMAC DRBG from SP800-90. Update algorithm and POST
to handle HMAC cases.
[Steve Henson]

114
crypto/dsa/dsa_gen.c
View file

@ -452,11 +452,11 @@ int fips_check_dsa_prng(DSA *dsa, size_t L, size_t N)
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;
@ -466,8 +466,11 @@ int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
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())
{
@ -497,7 +500,12 @@ int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
seed = OPENSSL_malloc(seed_len);
if (!seed)
if (seed_out)
seed_tmp = seed_out;
else
seed_tmp = OPENSSL_malloc(seed_len);
if (!seed || !seed_tmp)
goto err;
if (seed_in)
@ -513,12 +521,24 @@ int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
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;
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 (;;)
@ -648,21 +668,50 @@ 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 (;;)
{
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))
@ -671,12 +720,18 @@ end:
ok=1;
err:
if (ok == 1)
{
if (p != ret->p)
{
if(ret->p) BN_free(ret->p);
if(ret->q) BN_free(ret->q);
if(ret->g) BN_free(ret->g);
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)
{
@ -688,12 +743,53 @@ err:
}
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

6
crypto/dsa/dsa_locl.h
View file

@ -59,7 +59,9 @@ int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
unsigned char *seed_out,
int *counter_ret, unsigned long *h_ret, BN_GENCB *cb);
int dsa_builtin_paramgen2(DSA *ret, size_t bits, size_t qbits,
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 dsa_paramgen_check_g(DSA *dsa);

49
fips/dsa/fips_dssvs.c
View file

@ -111,9 +111,9 @@ int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
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 dsa_builtin_paramgen2(DSA *ret, size_t bits, size_t qbits,
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);
static void pqg(FILE *in, FILE *out)
@ -160,7 +160,7 @@ static void pqg(FILE *in, FILE *out)
exit(1);
}
if (dsa2 && dsa_builtin_paramgen2(dsa, L, N, md,
NULL, 0, seed,
NULL, 0, -1, seed,
&counter, &h, NULL) <= 0)
{
fprintf(stderr, "Parameter Generation error\n");
@ -191,8 +191,8 @@ static void pqgver(FILE *in, FILE *out)
DSA *dsa=NULL;
int dsa2, L, N, part_test = 0;
const EVP_MD *md = NULL;
int seedlen=-1;
unsigned char seed[1024];
int seedlen=-1, idxlen, idx = -1;
unsigned char seed[1024], idtmp[1024];
while(fgets(buf,sizeof buf,in) != NULL)
{
@ -221,7 +221,8 @@ static void pqgver(FILE *in, FILE *out)
q=hex2bn(value);
else if(!strcmp(keyword,"G"))
g=hex2bn(value);
else if(!strcmp(keyword,"Seed"))
else if(!strcmp(keyword,"Seed")
|| !strcmp(keyword,"domain_parameter_seed"))
{
seedlen = hex2bin(value, seed);
if (!dsa2 && seedlen != 20)
@ -229,9 +230,21 @@ static void pqgver(FILE *in, FILE *out)
fprintf(stderr, "Seed parse length error\n");
exit (1);
}
if (idx > 0)
part_test = 1;
}
else if(!strcmp(keyword,"index"))
{
idxlen = hex2bin(value, idtmp);
if (idxlen != 1)
{
fprintf(stderr, "Index value error\n");
exit (1);
}
idx = idtmp[0];
}
else if(!strcmp(keyword,"c"))
counter =atoi(buf+4);
counter = atoi(buf+4);
partial:
if(!strcmp(keyword,"H") || part_test)
{
@ -243,6 +256,11 @@ static void pqgver(FILE *in, FILE *out)
exit (1);
}
dsa = FIPS_dsa_new();
if (idx >= 0)
{
dsa->p = BN_dup(p);
dsa->q = BN_dup(q);
}
if (!dsa2 && !dsa_builtin_paramgen(dsa, L, N, md,
seed, seedlen, NULL,
&counter2, &h2, NULL))
@ -251,13 +269,20 @@ static void pqgver(FILE *in, FILE *out)
exit(1);
}
if (dsa2 && dsa_builtin_paramgen2(dsa, L, N, md,
seed, seedlen, NULL,
seed, seedlen, idx, NULL,
&counter2, &h2, NULL) < 0)
{
fprintf(stderr, "Parameter Generation error\n");
exit(1);
}
if (BN_cmp(dsa->p, p) || BN_cmp(dsa->q, q) ||
if (idx >= 0)
{
if (BN_cmp(dsa->g, g))
fprintf(out, "Result = F\n");
else
fprintf(out, "Result = P\n");
}
else if (BN_cmp(dsa->p, p) || BN_cmp(dsa->q, q) ||
(!part_test &&
((BN_cmp(dsa->g, g) || (counter != counter2) || (h != h2)))))
fprintf(out, "Result = F\n");
@ -273,9 +298,11 @@ static void pqgver(FILE *in, FILE *out)
dsa = NULL;
if (part_test)
{
if (idx == -1)
fputs(buf,out);
part_test = 0;
}
idx = -1;
}
}
}
@ -436,7 +463,7 @@ static void keypair(FILE *in, FILE *out)
fprintf(stderr, "Parameter Generation error\n");
exit(1);
}
if (dsa2 && dsa_builtin_paramgen2(dsa, L, N, NULL, NULL, 0,
if (dsa2 && dsa_builtin_paramgen2(dsa, L, N, NULL, NULL, 0, -1,
NULL, NULL, NULL, NULL) <= 0)
{
fprintf(stderr, "Parameter Generation error\n");
@ -493,7 +520,7 @@ static void siggen(FILE *in, FILE *out)
fprintf(stderr, "Parameter Generation error\n");
exit(1);
}
if (dsa2 && dsa_builtin_paramgen2(dsa, L, N, md, NULL, 0,
if (dsa2 && dsa_builtin_paramgen2(dsa, L, N, md, NULL, 0, -1,
NULL, NULL, NULL, NULL) <= 0)
{
fprintf(stderr, "Parameter Generation error\n");