-/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2006.
*/
/* ====================================================================
#include "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
-#include <openssl/rsa.h>
#include <openssl/evp.h>
+#include <openssl/dh.h>
+#include <openssl/bn.h>
+#ifndef OPENSSL_NO_DSA
+#include <openssl/dsa.h>
+#endif
+#include <openssl/objects.h>
#include "evp_locl.h"
/* DH pkey context structure */
int prime_len;
int generator;
int use_dsa;
+ int subprime_len;
+ /* message digest used for parameter generation */
+ const EVP_MD *md;
+ int rfc5114_param;
/* Keygen callback info */
int gentmp[2];
- /* message digest */
+ /* KDF (if any) to use for DH */
+ char kdf_type;
+ /* OID to use for KDF */
+ ASN1_OBJECT *kdf_oid;
+ /* Message digest to use for key derivation */
+ const EVP_MD *kdf_md;
+ /* User key material */
+ unsigned char *kdf_ukm;
+ size_t kdf_ukmlen;
+ /* KDF output length */
+ size_t kdf_outlen;
} DH_PKEY_CTX;
static int pkey_dh_init(EVP_PKEY_CTX *ctx)
if (!dctx)
return 0;
dctx->prime_len = 1024;
+ dctx->subprime_len = -1;
dctx->generator = 2;
dctx->use_dsa = 0;
+ dctx->md = NULL;
+ dctx->rfc5114_param = 0;
+
+ dctx->kdf_type = EVP_PKEY_DH_KDF_NONE;
+ dctx->kdf_oid = NULL;
+ dctx->kdf_md = NULL;
+ dctx->kdf_ukm = NULL;
+ dctx->kdf_ukmlen = 0;
+ dctx->kdf_outlen = 0;
ctx->data = dctx;
ctx->keygen_info = dctx->gentmp;
return 1;
}
+static int pkey_dh_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
+ {
+ DH_PKEY_CTX *dctx, *sctx;
+ if (!pkey_dh_init(dst))
+ return 0;
+ sctx = src->data;
+ dctx = dst->data;
+ dctx->prime_len = sctx->prime_len;
+ dctx->subprime_len = sctx->subprime_len;
+ dctx->generator = sctx->generator;
+ dctx->use_dsa = sctx->use_dsa;
+ dctx->md = sctx->md;
+ dctx->rfc5114_param = sctx->rfc5114_param;
+
+ dctx->kdf_type = sctx->kdf_type;
+ dctx->kdf_oid = OBJ_dup(sctx->kdf_oid);
+ if (!dctx->kdf_oid)
+ return 0;
+ dctx->kdf_md = sctx->kdf_md;
+ if (dctx->kdf_ukm)
+ {
+ dctx->kdf_ukm = BUF_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
+ dctx->kdf_ukmlen = sctx->kdf_ukmlen;
+ }
+ dctx->kdf_outlen = sctx->kdf_outlen;
+ return 1;
+ }
+
static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
{
DH_PKEY_CTX *dctx = ctx->data;
if (dctx)
+ {
+ if (dctx->kdf_ukm)
+ OPENSSL_free(dctx->kdf_ukm);
+ if (dctx->kdf_oid)
+ ASN1_OBJECT_free(dctx->kdf_oid);
OPENSSL_free(dctx);
+ }
}
static int pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
dctx->prime_len = p1;
return 1;
+ case EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN:
+ if (dctx->use_dsa == 0)
+ return -2;
+ dctx->subprime_len = p1;
+ return 1;
+
case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
+ if (dctx->use_dsa)
+ return -2;
dctx->generator = p1;
return 1;
+ case EVP_PKEY_CTRL_DH_PARAMGEN_TYPE:
+#ifdef OPENSSL_NO_DSA
+ if (p1 != 0)
+ return -2;
+#else
+ if (p1 < 0 || p1 > 2)
+ return -2;
+#endif
+ dctx->use_dsa = p1;
+ return 1;
+
+ case EVP_PKEY_CTRL_DH_RFC5114:
+ if (p1 < 1 || p1 > 3)
+ return -2;
+ dctx->rfc5114_param = p1;
+ return 1;
+
case EVP_PKEY_CTRL_PEER_KEY:
/* Default behaviour is OK */
return 1;
+ case EVP_PKEY_CTRL_DH_KDF_TYPE:
+ if (p1 == -2)
+ return dctx->kdf_type;
+ if (p1 != EVP_PKEY_DH_KDF_NONE &&
+ p1 != EVP_PKEY_DH_KDF_X9_42)
+ return -2;
+ dctx->kdf_type = p1;
+ return 1;
+
+ case EVP_PKEY_CTRL_DH_KDF_MD:
+ dctx->kdf_md = p2;
+ return 1;
+
+ case EVP_PKEY_CTRL_GET_DH_KDF_MD:
+ *(const EVP_MD **)p2 = dctx->kdf_md;
+ return 1;
+
+ case EVP_PKEY_CTRL_DH_KDF_OUTLEN:
+ if (p1 <= 0)
+ return -2;
+ dctx->kdf_outlen = (size_t)p1;
+ return 1;
+
+ case EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN:
+ *(int *)p2 = dctx->kdf_outlen;
+ return 1;
+
+ case EVP_PKEY_CTRL_DH_KDF_UKM:
+ if (dctx->kdf_ukm)
+ OPENSSL_free(dctx->kdf_ukm);
+ dctx->kdf_ukm = p2;
+ if (p2)
+ dctx->kdf_ukmlen = p1;
+ else
+ dctx->kdf_ukmlen = 0;
+ return 1;
+
+ case EVP_PKEY_CTRL_GET_DH_KDF_UKM:
+ *(unsigned char **)p2 = dctx->kdf_ukm;
+ return dctx->kdf_ukmlen;
+
+ case EVP_PKEY_CTRL_DH_KDF_OID:
+ if (dctx->kdf_oid)
+ ASN1_OBJECT_free(dctx->kdf_oid);
+ dctx->kdf_oid = p2;
+ return 1;
+
+ case EVP_PKEY_CTRL_GET_DH_KDF_OID:
+ *(ASN1_OBJECT **)p2 = dctx->kdf_oid;
+ return 1;
+
default:
return -2;
}
}
-
+
static int pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
len = atoi(value);
return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
}
+ if (!strcmp(type, "dh_rfc5114"))
+ {
+ DH_PKEY_CTX *dctx = ctx->data;
+ int len;
+ len = atoi(value);
+ if (len < 0 || len > 3)
+ return -2;
+ dctx->rfc5114_param = len;
+ return 1;
+ }
if (!strcmp(type, "dh_paramgen_generator"))
{
int len;
len = atoi(value);
return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
}
+ if (!strcmp(type, "dh_paramgen_subprime_len"))
+ {
+ int len;
+ len = atoi(value);
+ return EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len);
+ }
+ if (!strcmp(type, "dh_paramgen_type"))
+ {
+ int typ;
+ typ = atoi(value);
+ return EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ);
+ }
return -2;
}
+#ifndef OPENSSL_NO_DSA
+
+extern 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);
+
+extern 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);
+
+static DSA *dsa_dh_generate(DH_PKEY_CTX *dctx, BN_GENCB *pcb)
+ {
+ DSA *ret;
+ int rv = 0;
+ int prime_len = dctx->prime_len;
+ int subprime_len = dctx->subprime_len;
+ const EVP_MD *md = dctx->md;
+ if (dctx->use_dsa > 2)
+ return NULL;
+ ret = DSA_new();
+ if (!ret)
+ return NULL;
+ if (subprime_len == -1)
+ {
+ if (prime_len >= 2048)
+ subprime_len = 256;
+ else
+ subprime_len = 160;
+ }
+ if (md == NULL)
+ {
+ if (prime_len >= 2048)
+ md = EVP_sha256();
+ else
+ md = EVP_sha1();
+ }
+ if (dctx->use_dsa == 1)
+ rv = dsa_builtin_paramgen(ret, prime_len, subprime_len, md,
+ NULL, 0, NULL, NULL, NULL, pcb);
+ else if(dctx->use_dsa == 2)
+ rv = dsa_builtin_paramgen2(ret, prime_len, subprime_len, md,
+ NULL, 0, -1, NULL, NULL, NULL, pcb);
+ if (rv <= 0)
+ {
+ DSA_free(ret);
+ return NULL;
+ }
+ return ret;
+ }
+
+#endif
+
static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
DH *dh = NULL;
DH_PKEY_CTX *dctx = ctx->data;
BN_GENCB *pcb, cb;
int ret;
+ if (dctx->rfc5114_param)
+ {
+ switch (dctx->rfc5114_param)
+ {
+ case 1:
+ dh = DH_get_1024_160();
+ break;
+
+ case 2:
+ dh = DH_get_2048_224();
+ break;
+
+ case 3:
+ dh = DH_get_2048_256();
+ break;
+
+ default:
+ return -2;
+ }
+ EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
+ return 1;
+ }
+
if (ctx->pkey_gencb)
{
pcb = &cb;
}
else
pcb = NULL;
+#ifndef OPENSSL_NO_DSA
+ if (dctx->use_dsa)
+ {
+ DSA *dsa_dh;
+ dsa_dh = dsa_dh_generate(dctx, pcb);
+ if (!dsa_dh)
+ return 0;
+ dh = DSA_dup_DH(dsa_dh);
+ DSA_free(dsa_dh);
+ if (!dh)
+ return 0;
+ EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
+ return 1;
+ }
+#endif
dh = DH_new();
if (!dh)
return 0;
ret = DH_generate_parameters_ex(dh,
dctx->prime_len, dctx->generator, pcb);
+
if (ret)
EVP_PKEY_assign_DH(pkey, dh);
else
dh = DH_new();
if (!dh)
return 0;
- EVP_PKEY_assign_DH(pkey, dh);
+ EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, dh);
/* Note: if error return, pkey is freed by parent routine */
if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
return 0;
return DH_generate_key(pkey->pkey.dh);
}
-static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key, int *keylen)
+static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
{
int ret;
+ DH *dh;
+ DH_PKEY_CTX *dctx = ctx->data;
+ BIGNUM *dhpub;
if (!ctx->pkey || !ctx->peerkey)
{
DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET);
return 0;
}
- ret = DH_compute_key(key, ctx->peerkey->pkey.dh->pub_key,
- ctx->pkey->pkey.dh);
- if (ret < 0)
+ dh = ctx->pkey->pkey.dh;
+ dhpub = ctx->peerkey->pkey.dh->pub_key;
+ if (dctx->kdf_type == EVP_PKEY_DH_KDF_NONE)
+ {
+ if (key == NULL)
+ {
+ *keylen = DH_size(dh);
+ return 1;
+ }
+ ret = DH_compute_key(key, dhpub, dh);
+ if (ret < 0)
+ return ret;
+ *keylen = ret;
+ return 1;
+ }
+ else if (dctx->kdf_type == EVP_PKEY_DH_KDF_X9_42)
+ {
+ unsigned char *Z = NULL;
+ size_t Zlen = 0;
+ if (!dctx->kdf_outlen || !dctx->kdf_oid)
+ return 0;
+ if (key == NULL)
+ {
+ *keylen = dctx->kdf_outlen;
+ return 1;
+ }
+ if (*keylen != dctx->kdf_outlen)
+ return 0;
+ ret = 0;
+ Zlen = DH_size(dh);
+ Z = OPENSSL_malloc(Zlen);
+ if (DH_compute_key_padded(Z, dhpub, dh) <= 0)
+ goto err;
+ if (!DH_KDF_X9_42(key, *keylen, Z, Zlen, dctx->kdf_oid,
+ dctx->kdf_ukm, dctx->kdf_ukmlen,
+ dctx->kdf_md))
+ goto err;
+ *keylen = dctx->kdf_outlen;
+ ret = 1;
+ err:
+ if (Z)
+ {
+ OPENSSL_cleanse(Z, Zlen);
+ OPENSSL_free(Z);
+ }
return ret;
- *keylen = ret;
+ }
return 1;
}
const EVP_PKEY_METHOD dh_pkey_meth =
{
EVP_PKEY_DH,
- EVP_PKEY_FLAG_AUTOARGLEN,
+ 0,
+ pkey_dh_init,
+ pkey_dh_copy,
+ pkey_dh_cleanup,
+
+ 0,
+ pkey_dh_paramgen,
+
+ 0,
+ pkey_dh_keygen,
+
+ 0,
+ 0,
+
+ 0,
+ 0,
+
+ 0,0,
+
+ 0,0,0,0,
+
+ 0,0,
+
+ 0,0,
+
+ 0,
+ pkey_dh_derive,
+
+ pkey_dh_ctrl,
+ pkey_dh_ctrl_str
+
+ };
+
+const EVP_PKEY_METHOD dhx_pkey_meth =
+ {
+ EVP_PKEY_DHX,
+ 0,
pkey_dh_init,
+ pkey_dh_copy,
pkey_dh_cleanup,
0,
projects / openssl.git / blobdiff