/* DH parameters from RFC7919 and RFC3526 */
+/*
+ * DH low level APIs are deprecated for public use, but still ok for
+ * internal use.
+ */
+#include "internal/deprecated.h"
+
#include <stdio.h>
#include "internal/cryptlib.h"
+#include "internal/ffc.h"
#include "dh_local.h"
#include <openssl/bn.h>
#include <openssl/objects.h>
#include "crypto/bn_dh.h"
+#include "crypto/dh.h"
+#include "crypto/security_bits.h"
+#include "e_os.h" /* strcasecmp */
+
+#define FFDHE(sz) { \
+ SN_ffdhe##sz, NID_ffdhe##sz, \
+ sz, \
+ &_bignum_ffdhe##sz##_p, NULL, &_bignum_const_2 \
+}
+
+#define MODP(sz) { \
+ SN_modp_##sz, NID_modp_##sz, \
+ sz, \
+ &_bignum_modp_##sz##_p, NULL, &_bignum_const_2 \
+}
+
+#define RFC5114(name, uid, sz, tag) { \
+ name, uid, \
+ sz, \
+ &_bignum_dh##tag##_p, &_bignum_dh##tag##_q, &_bignum_dh##tag##_g \
+}
-static DH *dh_param_init(int nid, const BIGNUM *p, int32_t nbits)
+typedef struct dh_named_group_st {
+ const char *name;
+ int uid;
+ int32_t nbits;
+ const BIGNUM *p;
+ const BIGNUM *q;
+ const BIGNUM *g;
+} DH_NAMED_GROUP;
+
+
+static const DH_NAMED_GROUP dh_named_groups[] = {
+ FFDHE(2048),
+ FFDHE(3072),
+ FFDHE(4096),
+ FFDHE(6144),
+ FFDHE(8192),
+#ifndef FIPS_MODE
+ MODP(1536),
+#endif
+ MODP(2048),
+ MODP(3072),
+ MODP(4096),
+ MODP(6144),
+ MODP(8192),
+ /*
+ * Additional dh named groups from RFC 5114 that have a different g.
+ * The uid can be any unique identifier.
+ */
+#ifndef FIPS_MODE
+ RFC5114("dh_1024_160", 1, 1024, 1024_160),
+ RFC5114("dh_2048_224", 2, 2048, 2048_224),
+ RFC5114("dh_2048_256", 3, 2048, 2048_256),
+#endif
+};
+
+int ffc_named_group_to_uid(const char *name)
{
- BIGNUM *q = NULL;
- DH *dh = DH_new();
+ size_t i;
+
+ for (i = 0; i < OSSL_NELEM(dh_named_groups); ++i) {
+ if (strcasecmp(dh_named_groups[i].name, name) == 0)
+ return dh_named_groups[i].uid;
+ }
+ return NID_undef;
+}
+
+const char *ffc_named_group_from_uid(int uid)
+{
+ size_t i;
+
+ for (i = 0; i < OSSL_NELEM(dh_named_groups); ++i) {
+ if (dh_named_groups[i].uid == uid)
+ return dh_named_groups[i].name;
+ }
+ return NULL;
+}
+
+static DH *dh_param_init(OPENSSL_CTX *libctx, int uid, const BIGNUM *p,
+ const BIGNUM *q, const BIGNUM *g,
+ int32_t nbits)
+{
+ BIGNUM *qtmp = NULL;
+ DH *dh = dh_new_with_libctx(libctx);
if (dh == NULL)
return NULL;
- q = BN_dup(p);
- /* Set q = (p - 1) / 2 (p is known to be odd so just shift right ) */
- if (q == NULL || !BN_rshift1(q, q)) {
- BN_free(q);
- DH_free(dh);
- return NULL;
+ if (q == NULL) {
+ qtmp = BN_dup(p);
+ /* Set q = (p - 1) / 2 (p is known to be odd so just shift right ) */
+ if (qtmp == NULL || !BN_rshift1(qtmp, qtmp)) {
+ BN_free(qtmp);
+ DH_free(dh);
+ return NULL;
+ }
}
- dh->params.nid = nid;
+ dh->params.nid = uid;
dh->params.p = (BIGNUM *)p;
- dh->params.q = (BIGNUM *)q;
- dh->params.g = (BIGNUM *)&_bignum_const_2;
+ dh->params.q = (q != NULL ? (BIGNUM *)q : qtmp);
+ dh->params.g = (BIGNUM *)g;
/* Private key length = 2 * max_target_security_strength */
dh->length = nbits;
dh->dirty_cnt++;
return dh;
}
-DH *DH_new_by_nid(int nid)
+static DH *dh_new_by_group_name(OPENSSL_CTX *libctx, const char *name)
{
- /*
- * The last parameter specified in these fields is
- * 2 * max_target_security_strength.
- * See SP800-56Ar3 Table(s) 25 & 26.
- */
- switch (nid) {
- case NID_ffdhe2048:
- return dh_param_init(nid, &_bignum_ffdhe2048_p, 225);
- case NID_ffdhe3072:
- return dh_param_init(nid, &_bignum_ffdhe3072_p, 275);
- case NID_ffdhe4096:
- return dh_param_init(nid, &_bignum_ffdhe4096_p, 325);
- case NID_ffdhe6144:
- return dh_param_init(nid, &_bignum_ffdhe6144_p, 375);
- case NID_ffdhe8192:
- return dh_param_init(nid, &_bignum_ffdhe8192_p, 400);
-#ifndef FIPS_MODE
- case NID_modp_1536:
- return dh_param_init(nid, &_bignum_modp_1536_p, 190);
-#endif
- case NID_modp_2048:
- return dh_param_init(nid, &_bignum_modp_2048_p, 225);
- case NID_modp_3072:
- return dh_param_init(nid, &_bignum_modp_3072_p, 275);
- case NID_modp_4096:
- return dh_param_init(nid, &_bignum_modp_4096_p, 325);
- case NID_modp_6144:
- return dh_param_init(nid, &_bignum_modp_6144_p, 375);
- case NID_modp_8192:
- return dh_param_init(nid, &_bignum_modp_8192_p, 400);
- default:
- DHerr(DH_F_DH_NEW_BY_NID, DH_R_INVALID_PARAMETER_NID);
+ int i;
+
+ if (name == NULL)
return NULL;
+
+ for (i = 0; i < (int)OSSL_NELEM(dh_named_groups); ++i) {
+ if (strcasecmp(dh_named_groups[i].name, name) == 0) {
+ int max_target_security_strength =
+ ifc_ffc_compute_security_bits(dh_named_groups[i].nbits);
+
+ /*
+ * The last parameter specified here is
+ * 2 * max_target_security_strength.
+ * See SP800-56Ar3 Table(s) 25 & 26.
+ */
+ return dh_param_init(libctx, dh_named_groups[i].uid,
+ dh_named_groups[i].p,
+ dh_named_groups[i].q,
+ dh_named_groups[i].g,
+ 2 * max_target_security_strength);
+ }
+ }
+ DHerr(0, DH_R_INVALID_PARAMETER_NID);
+ return NULL;
+}
+
+DH *dh_new_by_nid_with_libctx(OPENSSL_CTX *libctx, int nid)
+{
+ const char *name = ffc_named_group_from_uid(nid);
+
+ return dh_new_by_group_name(libctx, name);
+}
+
+DH *DH_new_by_nid(int nid)
+{
+ return dh_new_by_nid_with_libctx(NULL, nid);
+}
+
+int ffc_set_group_pqg(FFC_PARAMS *ffc, const char *group_name)
+{
+ int i;
+ BIGNUM *q = NULL;
+
+ if (ffc == NULL)
+ return 0;
+
+ for (i = 0; i < (int)OSSL_NELEM(dh_named_groups); ++i) {
+ if (strcasecmp(dh_named_groups[i].name, group_name) == 0) {
+ if (dh_named_groups[i].q != NULL) {
+ /* For groups with a q */
+ ffc_params_set0_pqg(ffc,
+ (BIGNUM *)dh_named_groups[i].p,
+ (BIGNUM *)dh_named_groups[i].q,
+ (BIGNUM *)dh_named_groups[i].g);
+ } else {
+ /* For SAFE PRIME GROUPS */
+ /* Set q = (p - 1) / 2 (p is known to be odd so just shift right) */
+ q = BN_dup(dh_named_groups[i].p);
+ if (q == NULL || !BN_rshift1(q, q))
+ break; /* exit with failure */
+
+ ffc_params_set0_pqg(ffc,
+ (BIGNUM *)dh_named_groups[i].p, q,
+ (BIGNUM *)dh_named_groups[i].g);
+ }
+ /* flush the cached nid, The DH layer is responsible for caching */
+ ffc->nid = NID_undef;
+ return 1;
+ }
}
+ /* gets here on error or if the name was not found */
+ BN_free(q);
+ return 0;
}
int DH_get_nid(DH *dh)
{
- int nid = dh->params.nid;
+ BIGNUM *q = NULL;
+ int i, nid;
+
+ if (dh == NULL)
+ return NID_undef;
+ nid = dh->params.nid;
+ /* Just return if it is already cached */
if (nid != NID_undef)
return nid;
- if (BN_get_word(dh->params.g) != 2)
- return NID_undef;
- if (!BN_cmp(dh->params.p, &_bignum_ffdhe2048_p))
- nid = NID_ffdhe2048;
- else if (!BN_cmp(dh->params.p, &_bignum_ffdhe3072_p))
- nid = NID_ffdhe3072;
- else if (!BN_cmp(dh->params.p, &_bignum_ffdhe4096_p))
- nid = NID_ffdhe4096;
- else if (!BN_cmp(dh->params.p, &_bignum_ffdhe6144_p))
- nid = NID_ffdhe6144;
- else if (!BN_cmp(dh->params.p, &_bignum_ffdhe8192_p))
- nid = NID_ffdhe8192;
-#ifndef FIPS_MODE
- else if (!BN_cmp(dh->params.p, &_bignum_modp_1536_p))
- nid = NID_modp_1536;
-#endif
- else if (!BN_cmp(dh->params.p, &_bignum_modp_2048_p))
- nid = NID_modp_2048;
- else if (!BN_cmp(dh->params.p, &_bignum_modp_3072_p))
- nid = NID_modp_3072;
- else if (!BN_cmp(dh->params.p, &_bignum_modp_4096_p))
- nid = NID_modp_4096;
- else if (!BN_cmp(dh->params.p, &_bignum_modp_6144_p))
- nid = NID_modp_6144;
- else if (!BN_cmp(dh->params.p, &_bignum_modp_8192_p))
- nid = NID_modp_8192;
- else
- return NID_undef;
+ for (i = 0; i < (int)OSSL_NELEM(dh_named_groups); ++i) {
+ /* Keep searching until a matching p is found */
+ if (BN_cmp(dh->params.p, dh_named_groups[i].p) != 0)
+ continue;
+
+ /* Return an error if g is not matching */
+ if (BN_cmp(dh->params.g, dh_named_groups[i].g) != 0)
+ break;
+ if (dh_named_groups[i].q != NULL) {
+ /* RFC5114 NAMED GROUPS have q defined */
+
+ /* Verify q is correct if it exists */
+ if (dh->params.q != NULL) {
+ if (BN_cmp(dh->params.q, dh_named_groups[i].q) != 0)
+ break; /* returns nid = NID_undef if q does not match */
+ } else {
+ dh->params.q = (BIGNUM *)dh_named_groups[i].q;
+ }
+ } else {
+ /* For SAFE PRIME GROUPS */
+
+ /* Set q = (p - 1) / 2 (p is known to be odd so just shift right) */
+ q = BN_dup(dh->params.p);
- /* Verify q is correct if it exists - reset the nid if it is not correct */
- if (dh->params.q != NULL) {
- BIGNUM *q = BN_dup(dh->params.p);
+ if (q == NULL || !BN_rshift1(q, q))
+ break; /* returns nid = NID_undef on failure */
- /* Check q = p * 2 + 1 we already know q is odd, so just shift right */
- if (q == NULL || !BN_rshift1(q, q) || (BN_cmp(dh->params.q, q) != 0))
- nid = NID_undef;
- BN_free(q);
+ /* Verify q is correct if it exists */
+ if (dh->params.q != NULL) {
+ if (BN_cmp(dh->params.q, q) != 0)
+ break; /* returns nid = NID_undef if q does not match */
+ } else {
+ /* assign the calculated q */
+ dh->params.q = q;
+ q = NULL; /* set to NULL so it is not freed */
+ }
+ }
+ nid = dh->params.nid = dh_named_groups[i].uid; /* cache the nid */
+ dh->length =
+ 2 * ifc_ffc_compute_security_bits(dh_named_groups[i].nbits);
+ dh->dirty_cnt++;
+ /* A matching p was found so break out of the loop */
+ break;
}
- dh->params.nid = nid; /* cache the nid */
+ BN_free(q);
return nid;
}
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