Add a hash helper

[onak.git] / hash-helper.c

diff --git a/hash-helper.c b/hash-helper.c
new file mode 100644 (file)
index 0000000..02b62d9
--- /dev/null
+++ b/hash-helper.c
@@ -0,0 +1,107 @@
+/*
+ * hash-helper.c - Helper functions for calculating hashes
+ *
+ * Copyright Jonathan McDowell <noodles@earth.li>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "build-config.h"
+#include "hash-helper.h"
+#include "onak.h"
+#include "openpgp.h"
+
+onak_status_t onak_hash(struct onak_hash_data *data, uint8_t *hash)
+{
+       struct onak_hash_ctx hash_ctx;
+       int i;
+
+       if (data == NULL) {
+               return ONAK_E_INVALID_PARAM;
+       }
+
+       if (data->chunks > MAX_HASH_CHUNKS) {
+               return ONAK_E_INVALID_PARAM;
+       }
+
+       switch (data->hashtype) {
+       case OPENPGP_HASH_MD5:
+               md5_init(&hash_ctx.md5);
+               for (i = 0; i < data->chunks; i++) {
+                       md5_update(&hash_ctx.md5, data->len[i], data->data[i]);
+               }
+               md5_digest(&hash_ctx.md5, MD5_DIGEST_SIZE, hash);
+               break;
+       case OPENPGP_HASH_SHA1:
+               sha1_init(&hash_ctx.sha1);
+               for (i = 0; i < data->chunks; i++) {
+                       sha1_update(&hash_ctx.sha1, data->len[i], data->data[i]);
+               }
+               sha1_digest(&hash_ctx.sha1, SHA1_DIGEST_SIZE, hash);
+               break;
+       case OPENPGP_HASH_SHA1X:
+               sha1x_init(&hash_ctx.sha1x);
+               for (i = 0; i < data->chunks; i++) {
+                       sha1x_update(&hash_ctx.sha1x, data->len[i], data->data[i]);
+               }
+               sha1x_digest(&hash_ctx.sha1x, SHA1X_DIGEST_SIZE, hash);
+               break;
+#ifdef HAVE_NETTLE
+       case OPENPGP_HASH_RIPEMD160:
+               ripemd160_init(&hash_ctx.ripemd160);
+               for (i = 0; i < data->chunks; i++) {
+                       ripemd160_update(&hash_ctx.ripemd160, data->len[i],
+                               data->data[i]);
+               }
+               ripemd160_digest(&hash_ctx.ripemd160, RIPEMD160_DIGEST_SIZE,
+                       hash);
+               break;
+       case OPENPGP_HASH_SHA224:
+               sha224_init(&hash_ctx.sha224);
+               for (i = 0; i < data->chunks; i++) {
+                       sha224_update(&hash_ctx.sha224, data->len[i],
+                               data->data[i]);
+               }
+               sha224_digest(&hash_ctx.sha224, SHA224_DIGEST_SIZE, hash);
+               break;
+       case OPENPGP_HASH_SHA256:
+               sha256_init(&hash_ctx.sha256);
+               for (i = 0; i < data->chunks; i++) {
+                       sha256_update(&hash_ctx.sha256, data->len[i],
+                               data->data[i]);
+               }
+               sha256_digest(&hash_ctx.sha256, SHA256_DIGEST_SIZE, hash);
+               break;
+       case OPENPGP_HASH_SHA384:
+               sha384_init(&hash_ctx.sha384);
+               for (i = 0; i < data->chunks; i++) {
+                       sha384_update(&hash_ctx.sha384, data->len[i],
+                               data->data[i]);
+               }
+               sha384_digest(&hash_ctx.sha384, SHA384_DIGEST_SIZE, hash);
+               break;
+       case OPENPGP_HASH_SHA512:
+               sha512_init(&hash_ctx.sha512);
+               for (i = 0; i < data->chunks; i++) {
+                       sha512_update(&hash_ctx.sha512, data->len[i],
+                               data->data[i]);
+               }
+               sha512_digest(&hash_ctx.sha512, SHA512_DIGEST_SIZE, hash);
+               break;
+#endif
+       default:
+               return ONAK_E_UNSUPPORTED_FEATURE;
+       }
+
+       return ONAK_E_OK;
+}