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authorHans Nilsson <[email protected]>2017-10-31 15:31:47 +0100
committerHans Nilsson <[email protected]>2017-11-10 12:27:47 +0100
commite394689e748ac582c6b4556e41556137c583b21a (patch)
tree55c2df330a42b99a9a035e365a5fa44072797911 /lib/crypto/c_src
parent1d0bd5f30cfd95d0977061618a5e483a8606deca (diff)
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crypto: Add privkey_to_pubkey/2 to get the public key from a priv key in an Engine
Only RSA and DSA so far.
Diffstat (limited to 'lib/crypto/c_src')
-rw-r--r--lib/crypto/c_src/crypto.c106
1 files changed, 104 insertions, 2 deletions
diff --git a/lib/crypto/c_src/crypto.c b/lib/crypto/c_src/crypto.c
index 28cc982c1e..b29c5082ba 100644
--- a/lib/crypto/c_src/crypto.c
+++ b/lib/crypto/c_src/crypto.c
@@ -348,6 +348,10 @@ static INLINE void RSA_get0_crt_params(const RSA *r, const BIGNUM **dmp1, const
static INLINE int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key);
static INLINE int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g);
+static INLINE void DSA_get0_pqg(const DSA *dsa,
+ const BIGNUM **p, const BIGNUM **q, const BIGNUM **g);
+static INLINE void DSA_get0_key(const DSA *dsa,
+ const BIGNUM **pub_key, const BIGNUM **priv_key);
static INLINE int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
{
@@ -364,6 +368,23 @@ static INLINE int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
return 1;
}
+static INLINE void
+DSA_get0_pqg(const DSA *dsa, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
+{
+ *p = dsa->p;
+ *q = dsa->q;
+ *g = dsa->g;
+}
+
+static INLINE void
+DSA_get0_key(const DSA *dsa, const BIGNUM **pub_key, const BIGNUM **priv_key)
+{
+ if (pub_key) *pub_key = dsa->pub_key;
+ if (priv_key) *priv_key = dsa->priv_key;
+}
+
+
+
static INLINE int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
static INLINE int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
static INLINE int DH_set_length(DH *dh, long length);
@@ -393,6 +414,8 @@ static INLINE int DH_set_length(DH *dh, long length)
return 1;
}
+
+
static INLINE void
DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
{
@@ -404,8 +427,8 @@ DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
static INLINE void
DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
{
- *pub_key = dh->pub_key;
- *priv_key = dh->priv_key;
+ if (pub_key) *pub_key = dh->pub_key;
+ if (priv_key) *priv_key = dh->priv_key;
}
#else /* End of compatibility definitions. */
@@ -454,6 +477,7 @@ static ERL_NIF_TERM dh_generate_parameters_nif(ErlNifEnv* env, int argc, const E
static ERL_NIF_TERM dh_check(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM dh_generate_key_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM dh_compute_key_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
+static ERL_NIF_TERM privkey_to_pubkey_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM srp_value_B_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM srp_user_secret_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM srp_host_secret_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
@@ -542,6 +566,7 @@ static ErlNifFunc nif_funcs[] = {
{"dh_check", 1, dh_check},
{"dh_generate_key_nif", 4, dh_generate_key_nif},
{"dh_compute_key_nif", 3, dh_compute_key_nif},
+ {"privkey_to_pubkey_nif", 2, privkey_to_pubkey_nif},
{"srp_value_B_nif", 5, srp_value_B_nif},
{"srp_user_secret_nif", 7, srp_user_secret_nif},
{"srp_host_secret_nif", 5, srp_host_secret_nif},
@@ -4765,6 +4790,83 @@ static ERL_NIF_TERM pkey_crypt_nif(ErlNifEnv *env, int argc, const ERL_NIF_TERM
/*--------------------------------*/
+static ERL_NIF_TERM privkey_to_pubkey_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{ /* (Algorithm, PrivKey | KeyMap) */
+ EVP_PKEY *pkey;
+ ERL_NIF_TERM alg = argv[0];
+ ERL_NIF_TERM result[8];
+
+ if (get_pkey_private_key(env, alg, argv[1], &pkey) != PKEY_OK) {
+ return enif_make_badarg(env);
+ }
+
+ if (alg == atom_rsa) {
+ const BIGNUM *n = NULL, *e = NULL, *d = NULL;
+ RSA *rsa = EVP_PKEY_get1_RSA(pkey);
+ if (rsa) {
+ RSA_get0_key(rsa, &n, &e, &d);
+ result[0] = bin_from_bn(env, e); // Exponent E
+ result[1] = bin_from_bn(env, n); // Modulus N = p*q
+ EVP_PKEY_free(pkey);
+ return enif_make_list_from_array(env, result, 2);
+ }
+
+ } else if (argv[0] == atom_dss) {
+ const BIGNUM *p = NULL, *q = NULL, *g = NULL, *pub_key = NULL;
+ DSA *dsa = EVP_PKEY_get1_DSA(pkey);
+ if (dsa) {
+ DSA_get0_pqg(dsa, &p, &q, &g);
+ DSA_get0_key(dsa, &pub_key, NULL);
+ result[0] = bin_from_bn(env, p);
+ result[1] = bin_from_bn(env, q);
+ result[2] = bin_from_bn(env, g);
+ result[3] = bin_from_bn(env, pub_key);
+ EVP_PKEY_free(pkey);
+ return enif_make_list_from_array(env, result, 4);
+ }
+
+ } else if (argv[0] == atom_ecdsa) {
+#if defined(HAVE_EC)
+ EC_KEY *ec = EVP_PKEY_get1_EC_KEY(pkey);
+ if (ec) {
+ /* Example of result:
+ {
+ Curve = {Field, Prime, Point, Order, CoFactor} =
+ {
+ Field = {prime_field,<<255,...,255>>},
+ Prime = {<<255,...,252>>,
+ <<90,...,75>>,
+ <<196,...,144>>
+ },
+ Point = <<4,...,245>>,
+ Order = <<255,...,81>>,
+ CoFactor = <<1>>
+ },
+ Key = <<151,...,62>>
+ }
+ or
+ {
+ Curve =
+ {characteristic_two_field,
+ M,
+ Basis = {tpbasis, _}
+ | {ppbasis, k1, k2, k3}
+ },
+ Key
+ }
+ */
+ EVP_PKEY_free(pkey);
+ return atom_notsup;
+ }
+#else
+ EVP_PKEY_free(pkey);
+ return atom_notsup;
+#endif
+ }
+
+ if (pkey) EVP_PKEY_free(pkey);
+ return enif_make_badarg(env);
+}
/*================================================================*/