static int
dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
{
const unsigned char *p, *pm;
int pklen, pmlen;
int ptype;
const void *pval;
const 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) {
DHerror(DH_R_PARAMETER_ENCODING_ERROR);
goto err;
}
pstr = pval;
pm = pstr->data;
pmlen = pstr->length;
if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) {
DHerror(DH_R_DECODE_ERROR);
goto err;
}
if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) {
DHerror(DH_R_DECODE_ERROR);
goto err;
}
/* We have parameters now set public key */
if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) {
DHerror(DH_R_BN_DECODE_ERROR);
goto err;
}
ASN1_INTEGER_free(public_key);
EVP_PKEY_assign_DH(pkey, dh);
return 1;
err:
if (public_key)
ASN1_INTEGER_free(public_key);
DH_free(dh);
return 0;
}
static int
dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
{
const unsigned char *p, *pm;
int pklen, pmlen;
int ptype;
const void *pval;
const 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))) {
DHerror(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:
DHerror(EVP_R_DECODE_ERROR);
dherr:
DH_free(dh);
return 0;
}
static int
dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
DH *dh;
int ptype;
unsigned char *penc = NULL;
int penclen;
ASN1_STRING *str;
ASN1_INTEGER *pub_key = NULL;
dh=pkey->pkey.dh;
str = ASN1_STRING_new();
if (str == NULL) {
DHerror(ERR_R_MALLOC_FAILURE);
goto err;
}
str->length = i2d_DHparams(dh, &str->data);
if (str->length <= 0) {
DHerror(ERR_R_MALLOC_FAILURE);
goto err;
}
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) {
DHerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH), ptype,
(void *)str, penc, penclen))
return 1;
err:
free(penc);
ASN1_STRING_free(str);
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) {
DHerror(ERR_R_MALLOC_FAILURE);
goto err;
}
params->length = i2d_DHparams(pkey->pkey.dh, ¶ms->data);
if (params->length <= 0) {
DHerror(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) {
DHerror(DH_R_BN_ERROR);
goto err;
}
dplen = i2d_ASN1_INTEGER(prkey, &dp);
ASN1_INTEGER_free(prkey);
prkey = NULL;
if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0,
V_ASN1_SEQUENCE, params, dp, dplen))
goto err;
return 1;
err:
free(dp);
ASN1_STRING_free(params);
ASN1_INTEGER_free(prkey);
return 0;
}
static int
dh_param_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
{
DH *dh;
if (!(dh = d2i_DHparams(NULL, pder, derlen))) {
DHerror(ERR_R_DH_LIB);
return 0;
}
EVP_PKEY_assign_DH(pkey, dh);
return 1;
}
int
DHparams_print_fp(FILE *fp, const DH *x)
{
BIO *b;
int ret;
if ((b = BIO_new(BIO_s_file())) == NULL) {
DHerror(ERR_R_BUF_LIB);
return 0;
}
BIO_set_fp(b,fp,BIO_NOCLOSE);
ret = DHparams_print(b, x);
BIO_free(b);
return ret;
}
static int
pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
{
int ret;
if (!ctx->pkey || !ctx->peerkey) {
DHerror(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)
return ret;
*keylen = ret;
return 1;
}
static int
pkey_dh_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
DH *dh = NULL;
if (ctx->pkey == NULL) {
DHerror(DH_R_NO_PARAMETERS_SET);
return 0;
}
dh = DH_new();
if (!dh)
return 0;
EVP_PKEY_assign_DH(pkey, 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
do_dh_print(BIO *bp, const DH *x, int indent, ASN1_PCTX *ctx, int ptype)
{
unsigned char *m = NULL;
int reason = ERR_R_BUF_LIB, ret = 0;
size_t buf_len = 0;
const char *ktype = NULL;
BIGNUM *priv_key, *pub_key;
if (ptype == 2)
priv_key = x->priv_key;
else
priv_key = NULL;
if (ptype > 0)
pub_key = x->pub_key;
else
pub_key = NULL;
update_buflen(x->p, &buf_len);
if (buf_len == 0) {
reason = ERR_R_PASSED_NULL_PARAMETER;
goto err;
}
update_buflen(x->g, &buf_len);
update_buflen(pub_key, &buf_len);
update_buflen(priv_key, &buf_len);
if (ptype == 2)
ktype = "PKCS#3 DH Private-Key";
else if (ptype == 1)
ktype = "PKCS#3 DH Public-Key";
else
ktype = "PKCS#3 DH Parameters";
m= malloc(buf_len + 10);
if (m == NULL) {
reason = ERR_R_MALLOC_FAILURE;
goto err;
}
BIO_indent(bp, indent, 128);
if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
goto err;
indent += 4;
if (!ASN1_bn_print(bp, "private-key:", priv_key, m, indent))
goto err;
if (!ASN1_bn_print(bp, "public-key:", pub_key, m, indent))
goto err;
if (!ASN1_bn_print(bp, "prime:", x->p, m, indent))
goto err;
if (!ASN1_bn_print(bp, "generator:", x->g, m, indent))
goto err;
if (x->length != 0) {
BIO_indent(bp, indent, 128);
if (BIO_printf(bp, "recommended-private-length: %d bits\n",
(int)x->length) <= 0)
goto err;
}
ret = 1;
if (0) {
err:
DHerror(reason);
}
free(m);
return(ret);
}
