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-rw-r--r--src/dh.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/src/dh.c b/src/dh.c
index bf1ade8b..66a0e704 100644
--- a/src/dh.c
+++ b/src/dh.c
@@ -1098,6 +1098,38 @@ out:
}
/**
+ * @internal
+ *
+ * @brief Convert a buffer into an unpadded base64 string.
+ * The caller has to free the memory.
+ *
+ * @param hash What should be converted to a base64 string.
+ *
+ * @param len Length of the buffer to convert.
+ *
+ * @return The base64 string or NULL on error.
+ *
+ * @see ssh_string_free_char()
+ */
+static char *ssh_get_b64_unpadded(const unsigned char *hash, size_t len)
+{
+ char *b64_padded = NULL;
+ char *b64_unpadded = NULL;
+ size_t k;
+
+ b64_padded = (char *)bin_to_base64(hash, (int)len);
+ if (b64_padded == NULL) {
+ return NULL;
+ }
+ for (k = strlen(b64_padded); k != 0 && b64_padded[k-1] == '='; k--);
+
+ b64_unpadded = strndup(b64_padded, k);
+ SAFE_FREE(b64_padded);
+
+ return b64_unpadded;
+}
+
+/**
* @brief Convert a buffer into a colon separated hex string.
* The caller has to free the memory.
*
@@ -1135,6 +1167,54 @@ char *ssh_get_hexa(const unsigned char *what, size_t len) {
}
/**
+ * @brief Print a hash as a human-readable hex- or base64-string.
+ *
+ * This function prints hex strings if the given hash is a md5 sum.
+ * But prints unpadded base64 strings for sha sums.
+ * Either way, the output is prepended by the hash-type.
+ *
+ * @param type Which sort of hash is given.
+ *
+ * @param hash What should be converted to a base64 string.
+ *
+ * @param len Length of the buffer to convert.
+ */
+void ssh_print_hash(enum ssh_publickey_hash_type type,
+ unsigned char *hash,
+ size_t len) {
+ const char *prefix = "UNKNOWN";
+ char *fingerprint = NULL;
+
+ switch (type) {
+ case SSH_PUBLICKEY_HASH_SHA1:
+ case SSH_PUBLICKEY_HASH_SHA256:
+ fingerprint = ssh_get_b64_unpadded(hash, len);
+ break;
+ case SSH_PUBLICKEY_HASH_MD5:
+ fingerprint = ssh_get_hexa(hash, len);
+ break;
+ }
+ if (fingerprint == NULL) {
+ return;
+ }
+
+ switch (type) {
+ case SSH_PUBLICKEY_HASH_MD5:
+ prefix = "MD5";
+ break;
+ case SSH_PUBLICKEY_HASH_SHA1:
+ prefix = "SHA1";
+ break;
+ case SSH_PUBLICKEY_HASH_SHA256:
+ prefix = "SHA256";
+ break;
+ }
+ fprintf(stderr, "%s:%s\n", prefix, fingerprint);
+
+ SAFE_FREE(fingerprint);
+}
+
+/**
* @brief Print a buffer as colon separated hex string.
*
* @param descr Description printed in front of the hex string.