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-rw-r--r--src/basic/gcrypt-util.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/basic/gcrypt-util.c b/src/basic/gcrypt-util.c
new file mode 100644
index 0000000..f304a2b
--- /dev/null
+++ b/src/basic/gcrypt-util.c
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#if HAVE_GCRYPT
+#include <gcrypt.h>
+
+#include "gcrypt-util.h"
+#include "hexdecoct.h"
+
+void initialize_libgcrypt(bool secmem) {
+ const char *p;
+ if (gcry_control(GCRYCTL_INITIALIZATION_FINISHED_P))
+ return;
+
+ p = gcry_check_version("1.4.5");
+ assert(p);
+
+ /* Turn off "secmem". Clients which wish to make use of this
+ * feature should initialize the library manually */
+ if (!secmem)
+ gcry_control(GCRYCTL_DISABLE_SECMEM);
+ gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
+}
+
+int string_hashsum(const char *s, size_t len, int md_algorithm, char **out) {
+ _cleanup_(gcry_md_closep) gcry_md_hd_t md = NULL;
+ size_t hash_size;
+ void *hash;
+ char *enc;
+
+ initialize_libgcrypt(false);
+
+ hash_size = gcry_md_get_algo_dlen(md_algorithm);
+ assert(hash_size > 0);
+
+ gcry_md_open(&md, md_algorithm, 0);
+ if (!md)
+ return -EIO;
+
+ gcry_md_write(md, s, len);
+
+ hash = gcry_md_read(md, 0);
+ if (!hash)
+ return -EIO;
+
+ enc = hexmem(hash, hash_size);
+ if (!enc)
+ return -ENOMEM;
+
+ *out = enc;
+ return 0;
+}
+#endif