Add EC_KEY_oct2priv and EC_KEY_priv2oct

[openssl.git] / crypto / ec / ec_key.c

diff --git a/crypto/ec/ec_key.c b/crypto/ec/ec_key.c
index a5c60f680fad358a2c2a0fbee4ea57413d4d2d5c..9fb6a6af135027cd36223fe806fc4e5912dbbb54 100644 (file)
--- a/crypto/ec/ec_key.c
+++ b/crypto/ec/ec_key.c
@@ -548,3 +548,56 @@ int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len,
         return 0;
     return EC_POINT_oct2point(key->group, key->pub_key, buf, len, ctx);
 }
+
+size_t EC_KEY_priv2oct(const EC_KEY *eckey, unsigned char *buf, size_t len)
+{
+    size_t buf_len, bn_len;
+    if (eckey->group == NULL || eckey->group->meth == NULL)
+        return 0;
+
+    buf_len = (EC_GROUP_get_degree(eckey->group) + 7) / 8;
+    if (eckey->priv_key == NULL)
+        return 0;
+    if (buf == NULL)
+        return buf_len;
+    else if (len < buf_len)
+        return 0;
+
+    bn_len = (size_t)BN_num_bytes(eckey->priv_key);
+
+    /* Octetstring may need leading zeros if BN is to short */
+
+    if (bn_len > buf_len) {
+        ECerr(EC_F_I2D_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
+        return 0;
+    }
+
+    if (!BN_bn2bin(eckey->priv_key, buf + buf_len - bn_len)) {
+        ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
+        return 0;
+    }
+
+    if (buf_len - bn_len > 0)
+        memset(buf, 0, buf_len - bn_len);
+
+    return buf_len;
+}
+
+int EC_KEY_oct2priv(EC_KEY *eckey, unsigned char *buf, size_t len)
+{
+    if (eckey->group == NULL || eckey->group->meth == NULL)
+        return 0;
+
+    if (eckey->priv_key == NULL)
+        eckey->priv_key = BN_secure_new();
+    if (eckey->priv_key == NULL) {
+        ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
+        return 0;
+    }
+    eckey->priv_key = BN_bin2bn(buf, len, eckey->priv_key);
+    if (eckey->priv_key == NULL) {
+        ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_BN_LIB);
+        return 0;
+    }
+    return 1;
+}