static int
old_dsa_priv_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
{
DSA *dsa;
BN_CTX *ctx = NULL;
BIGNUM *j, *p1, *newp1;
if (!(dsa = d2i_DSAPrivateKey(NULL, pder, derlen))) {
DSAerror(ERR_R_DSA_LIB);
return 0;
}
ctx = BN_CTX_new();
if (ctx == NULL)
goto err;
/*
* Check that p and q are consistent with each other.
*/
j = BN_CTX_get(ctx);
p1 = BN_CTX_get(ctx);
newp1 = BN_CTX_get(ctx);
if (j == NULL || p1 == NULL || newp1 == NULL)
goto err;
/* p1 = p - 1 */
if (BN_sub(p1, dsa->p, BN_value_one()) == 0)
goto err;
/* j = (p - 1) / q */
if (BN_div_ct(j, NULL, p1, dsa->q, ctx) == 0)
goto err;
/* q * j should == p - 1 */
if (BN_mul(newp1, dsa->q, j, ctx) == 0)
goto err;
if (BN_cmp(newp1, p1) != 0) {
DSAerror(DSA_R_BAD_Q_VALUE);
goto err;
}
/*
* Check that q is not a composite number.
*/
if (BN_is_prime_ex(dsa->q, BN_prime_checks, ctx, NULL) <= 0) {
DSAerror(DSA_R_BAD_Q_VALUE);
goto err;
}
BN_CTX_free(ctx);
EVP_PKEY_assign_DSA(pkey, dsa);
return 1;
err:
BN_CTX_free(ctx);
DSA_free(dsa);
return 0;
}
static int
dsa_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;
DSA *dsa = 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) {
pstr = pval;
pm = pstr->data;
pmlen = pstr->length;
if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen))) {
DSAerror(DSA_R_DECODE_ERROR);
goto err;
}
} else if (ptype == V_ASN1_NULL || ptype == V_ASN1_UNDEF) {
if (!(dsa = DSA_new())) {
DSAerror(ERR_R_MALLOC_FAILURE);
goto err;
}
} else {
DSAerror(DSA_R_PARAMETER_ENCODING_ERROR);
goto err;
}
if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) {
DSAerror(DSA_R_DECODE_ERROR);
goto err;
}
if (!(dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) {
DSAerror(DSA_R_BN_DECODE_ERROR);
goto err;
}
ASN1_INTEGER_free(public_key);
EVP_PKEY_assign_DSA(pkey, dsa);
return 1;
err:
if (public_key)
ASN1_INTEGER_free(public_key);
DSA_free(dsa);
return 0;
}
static int
dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
DSA *dsa;
void *pval = NULL;
int ptype;
unsigned char *penc = NULL;
int penclen;
dsa = pkey->pkey.dsa;
if (pkey->save_parameters && dsa->p && dsa->q && dsa->g) {
ASN1_STRING *str;
str = ASN1_STRING_new();
if (str == NULL) {
DSAerror(ERR_R_MALLOC_FAILURE);
goto err;
}
str->length = i2d_DSAparams(dsa, &str->data);
if (str->length <= 0) {
DSAerror(ERR_R_MALLOC_FAILURE);
ASN1_STRING_free(str);
goto err;
}
pval = str;
ptype = V_ASN1_SEQUENCE;
} else
ptype = V_ASN1_UNDEF;
dsa->write_params = 0;
penclen = i2d_DSAPublicKey(dsa, &penc);
if (penclen <= 0) {
DSAerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA), ptype, pval,
penc, penclen))
return 1;
err:
free(penc);
ASN1_STRING_free(pval);
return 0;
}
static int
dsa_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) {
DSAerror(ERR_R_MALLOC_FAILURE);
goto err;
}
params->length = i2d_DSAparams(pkey->pkey.dsa, ¶ms->data);
if (params->length <= 0) {
DSAerror(ERR_R_MALLOC_FAILURE);
goto err;
}
params->type = V_ASN1_SEQUENCE;
/* Get private key into integer */
prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
if (!prkey) {
DSAerror(DSA_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_dsa), 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
dsa_param_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
{
DSA *dsa;
if (!(dsa = d2i_DSAparams(NULL, pder, derlen))) {
DSAerror(ERR_R_DSA_LIB);
return 0;
}
EVP_PKEY_assign_DSA(pkey, dsa);
return 1;
}
int
DSAparams_print_fp(FILE *fp, const DSA *x)
{
BIO *b;
int ret;
if ((b = BIO_new(BIO_s_file())) == NULL) {
DSAerror(ERR_R_BUF_LIB);
return 0;
}
BIO_set_fp(b, fp, BIO_NOCLOSE);
ret = DSAparams_print(b, x);
BIO_free(b);
return ret;
}
/* Override the default new methods */
static int
sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg)
{
if (operation == ASN1_OP_NEW_PRE) {
DSA_SIG *sig;
sig = malloc(sizeof(DSA_SIG));
if (!sig) {
DSAerror(ERR_R_MALLOC_FAILURE);
return 0;
}
sig->r = NULL;
sig->s = NULL;
*pval = (ASN1_VALUE *)sig;
return 2;
}
return 1;
}
static int
dsa_sig_print(BIO *bp, const X509_ALGOR *sigalg, const ASN1_STRING *sig,
int indent, ASN1_PCTX *pctx)
{
DSA_SIG *dsa_sig;
const unsigned char *p;
if (!sig) {
if (BIO_puts(bp, "\n") <= 0)
return 0;
else
return 1;
}
p = sig->data;
dsa_sig = d2i_DSA_SIG(NULL, &p, sig->length);
if (dsa_sig) {
int rv = 0;
size_t buf_len = 0;
unsigned char *m = NULL;
update_buflen(dsa_sig->r, &buf_len);
update_buflen(dsa_sig->s, &buf_len);
m = malloc(buf_len + 10);
if (m == NULL) {
DSAerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (BIO_write(bp, "\n", 1) != 1)
goto err;
if (!ASN1_bn_print(bp, "r: ", dsa_sig->r, m, indent))
goto err;
if (!ASN1_bn_print(bp, "s: ", dsa_sig->s, m, indent))
goto err;
rv = 1;
err:
free(m);
DSA_SIG_free(dsa_sig);
return rv;
}
return X509_signature_dump(bp, sig, indent);
}
static int
do_dsa_print(BIO *bp, const DSA *x, int off, int ptype)
{
unsigned char *m = NULL;
int ret = 0;
size_t buf_len = 0;
const char *ktype = NULL;
const 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;
if (ptype == 2)
ktype = "Private-Key";
else if (ptype == 1)
ktype = "Public-Key";
else
ktype = "DSA-Parameters";
update_buflen(x->p, &buf_len);
update_buflen(x->q, &buf_len);
update_buflen(x->g, &buf_len);
update_buflen(priv_key, &buf_len);
update_buflen(pub_key, &buf_len);
m = malloc(buf_len + 10);
if (m == NULL) {
DSAerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (priv_key) {
if (!BIO_indent(bp, off, 128))
goto err;
if (BIO_printf(bp, "%s: (%d bit)\n", ktype,
BN_num_bits(x->p)) <= 0)
goto err;
}
if (!ASN1_bn_print(bp, "priv:", priv_key, m, off))
goto err;
if (!ASN1_bn_print(bp, "pub: ", pub_key, m, off))
goto err;
if (!ASN1_bn_print(bp, "P: ", x->p, m, off))
goto err;
if (!ASN1_bn_print(bp, "Q: ", x->q, m, off))
goto err;
if (!ASN1_bn_print(bp, "G: ", x->g, m, off))
goto err;
ret = 1;
err:
free(m);
return(ret);
}
/* In PKCS#8 DSA: you just get a private key integer and parameters in the
* AlgorithmIdentifier the pubkey must be recalculated.
*/
static int
dsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
{
const unsigned char *p, *pm;
int pklen, pmlen;
int ptype;
const void *pval;
const ASN1_STRING *pstr;
const X509_ALGOR *palg;
ASN1_INTEGER *privkey = NULL;
BN_CTX *ctx = NULL;
DSA *dsa = NULL;
int ret = 0;
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)) == NULL)
goto decerr;
if (privkey->type == V_ASN1_NEG_INTEGER)
goto decerr;
pstr = pval;
pm = pstr->data;
pmlen = pstr->length;
if (!(dsa = d2i_DSAparams(NULL, &pm, pmlen)))
goto decerr;
/* We have parameters now set private key */
if (!(dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) {
DSAerror(DSA_R_BN_ERROR);
goto dsaerr;
}
/* Calculate public key */
if (!(dsa->pub_key = BN_new())) {
DSAerror(ERR_R_MALLOC_FAILURE);
goto dsaerr;
}
if (!(ctx = BN_CTX_new())) {
DSAerror(ERR_R_MALLOC_FAILURE);
goto dsaerr;
}
if (!BN_mod_exp_ct(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx)) {
DSAerror(DSA_R_BN_ERROR);
goto dsaerr;
}
if (!EVP_PKEY_assign_DSA(pkey, dsa))
goto decerr;
ret = 1;
goto done;
decerr:
DSAerror(DSA_R_DECODE_ERROR);
dsaerr:
DSA_free(dsa);
done:
BN_CTX_free(ctx);
ASN1_INTEGER_free(privkey);
return ret;
}
