+static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
+ {
+ const unsigned char *p, *pm;
+ int pklen, pmlen;
+ int ptype;
+ void *pval;
+ ASN1_STRING *pstr;
+ X509_ALGOR *palg;
+ ASN1_INTEGER *public_key = NULL;
+
+ DH *dh = NULL;
+
+ if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
+ return 0;
+ X509_ALGOR_get0(NULL, &ptype, &pval, palg);
+
+ if (ptype != V_ASN1_SEQUENCE)
+ {
+ DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
+ goto err;
+ }
+
+ pstr = pval;
+ pm = pstr->data;
+ pmlen = pstr->length;
+
+ if (!(dh = d2i_DHparams(NULL, &pm, pmlen)))
+ {
+ DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
+ goto err;
+ }
+
+ if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
+ {
+ DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
+ goto err;
+ }
+
+ /* We have parameters now set public key */
+ if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
+ {
+ DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
+ goto err;
+ }
+
+ ASN1_INTEGER_free(public_key);
+ EVP_PKEY_assign_DH(pkey, dh);
+ return 1;
+
+ err:
+ if (pubkey)
+ ASN1_INTEGER_free(public_key);
+ if (dh)
+ DH_free(dh);
+ return 0;
+
+ }
+
+static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
+ {
+ DH *dh;
+ void *pval = NULL;
+ int ptype;
+ unsigned char *penc = NULL;
+ int penclen;
+ ASN1_STRING *str;
+ ASN1_INTEGER *pub_key = NULL;
+
+ dh=pkey->pkey.dh;
+
+ str = ASN1_STRING_new();
+ str->length = i2d_DHparams(dh, &str->data);
+ if (str->length <= 0)
+ {
+ DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ pval = str;
+ ptype = V_ASN1_SEQUENCE;
+
+ pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
+ if (!pub_key)
+ goto err;
+
+ penclen = i2d_ASN1_INTEGER(pub_key, &penc);
+
+ ASN1_INTEGER_free(pub_key);
+
+ if (penclen <= 0)
+ {
+ DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH),
+ ptype, pval, penc, penclen))
+ return 1;
+
+ err:
+ if (penc)
+ OPENSSL_free(penc);
+ if (pval)
+ ASN1_STRING_free(pval);
+
+ return 0;
+ }
+
+
+/* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in
+ * that the AlgorithmIdentifier contains the paramaters, the private key
+ * is explcitly included and the pubkey must be recalculated.
+ */
+
+static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
+ {
+ const unsigned char *p, *pm;
+ int pklen, pmlen;
+ int ptype;
+ void *pval;
+ ASN1_STRING *pstr;
+ X509_ALGOR *palg;
+ ASN1_INTEGER *privkey = NULL;
+
+ DH *dh = NULL;
+
+ if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
+ return 0;
+
+ X509_ALGOR_get0(NULL, &ptype, &pval, palg);
+
+ if (ptype != V_ASN1_SEQUENCE)
+ goto decerr;
+
+ if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
+ goto decerr;
+
+
+ pstr = pval;
+ pm = pstr->data;
+ pmlen = pstr->length;
+ if (!(dh = d2i_DHparams(NULL, &pm, pmlen)))
+ goto decerr;
+ /* We have parameters now set private key */
+ if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
+ {
+ DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR);
+ goto dherr;
+ }
+ /* Calculate public key */
+ if (!DH_generate_key(dh))
+ goto dherr;
+
+ EVP_PKEY_assign_DH(pkey, dh);
+
+ ASN1_INTEGER_free(privkey);
+
+ return 1;
+
+ decerr:
+ DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
+ dherr:
+ DH_free(dh);
+ return 0;
+ }
+
+static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
+{
+ ASN1_STRING *params = NULL;
+ ASN1_INTEGER *prkey = NULL;
+ unsigned char *dp = NULL;
+ int dplen;
+
+ params = ASN1_STRING_new();
+
+ if (!params)
+ {
+ DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ params->length = i2d_DHparams(pkey->pkey.dh, ¶ms->data);
+ if (params->length <= 0)
+ {
+ DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+ params->type = V_ASN1_SEQUENCE;
+
+ /* Get private key into integer */
+ prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
+
+ if (!prkey)
+ {
+ DHerr(DH_F_DH_PRIV_ENCODE,DH_R_BN_ERROR);
+ goto err;
+ }
+
+ dplen = i2d_ASN1_INTEGER(prkey, &dp);
+
+ ASN1_INTEGER_free(prkey);
+
+ if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0,
+ V_ASN1_SEQUENCE, params, dp, dplen))
+ goto err;
+
+ return 1;
+
+err:
+ if (dp != NULL)
+ OPENSSL_free(dp);
+ if (params != NULL)
+ ASN1_STRING_free(params);
+ if (prkey != NULL)
+ ASN1_INTEGER_free(prkey);
+ return 0;
+}
+
+
+static void update_buflen(const BIGNUM *b, size_t *pbuflen)
+ {
+ size_t i;
+ if (!b)
+ return;
+ if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
+ *pbuflen = i;
+ }
+