api: add functions string_hash_binary and string_hash

2 files changed, 93 insertions, 0 deletions

diff --git a/src/core/wee-string.c b/src/core/wee-string.c
index 0d48d9b90..71154f631 100644
--- a/src/core/wee-string.c
+++ b/src/core/wee-string.c
@@ -34,6 +34,7 @@
 #include <regex.h>
 #include <wchar.h>
 #include <stdint.h>
+#include <gcrypt.h>
 
 #ifdef HAVE_ICONV
 #include <iconv.h>
@@ -52,6 +53,7 @@
 #include "wee-config.h"
 #include "wee-eval.h"
 #include "wee-hashtable.h"
+#include "wee-secure.h"
 #include "wee-utf8.h"
 #include "../gui/gui-chat.h"
 #include "../gui/gui-color.h"
@@ -63,6 +65,20 @@
                     ((c >= 'A') && (c <= 'F')) ? c - 'A' + 10 :         \
                     c - '0')
 
+char *string_hash_algo_string[] = {
+    "md5",
+    "sha1",
+    "sha224", "sha256", "sha384", "sha512",
+    "sha3-224", "sha3-256", "sha3-384", "sha3-512",
+    NULL,
+};
+int string_hash_algo[] = {
+    GCRY_MD_MD5,
+    GCRY_MD_SHA1,
+    GCRY_MD_SHA224, GCRY_MD_SHA256, GCRY_MD_SHA384, GCRY_MD_SHA512,
+    GCRY_MD_SHA3_224, GCRY_MD_SHA3_256, GCRY_MD_SHA3_384, GCRY_MD_SHA3_512,
+};
+
 struct t_hashtable *string_hashtable_shared = NULL;
 
 
@@ -3405,6 +3421,78 @@ end:
 }
 
 /*
+ * Returns the hash algorithm with the name, or GCRY_MD_NONE if not found.
+ */
+
+int
+string_get_hash_algo (const char *hash_algo)
+{
+    int i;
+
+    if (!hash_algo)
+        return GCRY_MD_NONE;
+
+    for (i = 0; string_hash_algo_string[i]; i++)
+    {
+        if (strcmp (string_hash_algo_string[i], hash_algo) == 0)
+            return string_hash_algo[i];
+    }
+
+    return GCRY_MD_NONE;
+}
+
+/*
+ * Computes hash data, as binary buffer.
+ *
+ * Note: "*hash" must be freed after use.
+ */
+
+void
+string_hash_binary (const char *data, int length_data, const char *hash_algo,
+                    char **hash, int *length_hash)
+{
+    int algo;
+
+    if (!hash || !length_hash)
+        return;
+
+    *hash = NULL;
+    *length_hash = 0;
+
+    if (!data || (length_data < 1) || !hash_algo)
+        return;
+
+    algo = string_get_hash_algo (hash_algo);
+    if (algo == GCRY_MD_NONE)
+        return;
+
+    secure_hash_binary (data, length_data, algo, hash, length_hash);
+}
+
+/*
+ * Computes hash of a buffer, as text (string with hexadecimal).
+ *
+ * Returns a string with the hash as hexadecimal, NULL if error.
+ *
+ * Note: result must be freed after use.
+ */
+
+char *
+string_hash (const char *data, int length_data, const char *hash_algo)
+{
+    int algo;
+
+    if (!data || (length_data < 1) || !hash_algo)
+        return NULL;
+
+    algo = string_get_hash_algo (hash_algo);
+    if (algo == GCRY_MD_NONE)
+        return NULL;
+
+    return secure_hash (data, length_data, algo);
+}
+
+/*
  * Checks if a string is a command.
  *
  * Returns:
diff --git a/src/core/wee-string.h b/src/core/wee-string.h
index 585cb399d..84d78b4a9 100644
--- a/src/core/wee-string.h
+++ b/src/core/wee-string.h
@@ -118,6 +118,11 @@ extern int string_base64_decode (const char *from, char *to);
 extern char *string_hex_dump (const char *data, int data_size,
                               int bytes_per_line,
                               const char *prefix, const char *suffix);
+extern void string_hash_binary (const char *data, int length_data,
+                                const char *hash_algo,
+                                char **hash, int *length_hash);
+extern char *string_hash (const char *data, int length_data,
+                          const char *hash_algo);
 extern int string_is_command_char (const char *string);
 extern const char *string_input_for_buffer (const char *string);
 extern char *string_replace_with_callback (const char *string,