1 files changed, 131 insertions, 0 deletions
diff --git a/src/common/armor.c b/src/common/armor.c
new file mode 100644
index 000000000..3508b82e3
--- /dev/null
+++ b/src/common/armor.c
@@ -0,0 +1,131 @@
+
+#if defined(__linux__)
+#include <linux/errno.h>
+#else
+#include <sys/errno.h>
+#endif
+
+/*
+ * base64 encode/decode.
+ */
+
+const char *pem_key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static int encode_bits(int c)
+{
+	return pem_key[c];
+}
+
+static int decode_bits(char c)
+{
+	if (c >= 'A' && c <= 'Z')
+		return c - 'A';
+	if (c >= 'a' && c <= 'z')
+		return c - 'a' + 26;
+	if (c >= '0' && c <= '9')
+		return c - '0' + 52;
+	if (c == '+' || c == '-')
+		return 62;
+	if (c == '/' || c == '_')
+		return 63;
+	if (c == '=')
+		return 0; /* just non-negative, please */
+	return -EINVAL;	
+}
+
+static int set_str_val(char **pdst, const char *end, char c)
+{
+	if (*pdst < end) {
+		char *p = *pdst;
+		*p = c;
+		(*pdst)++;
+	} else
+		return -ERANGE;
+
+	return 0;
+}
+
+int ceph_armor_line_break(char *dst, char * const dst_end, const char *src, const char *end, int line_width)
+{
+	int olen = 0;
+	int line = 0;
+
+#define SET_DST(c) do { \
+	int __ret = set_str_val(&dst, dst_end, c); \
+	if (__ret < 0) \
+		return __ret; \
+} while (0);
+
+	while (src < end) {
+		unsigned char a;
+
+		a = *src++;
+		SET_DST(encode_bits(a >> 2));
+		if (src < end) {
+			unsigned char b;
+			b = *src++;
+			SET_DST(encode_bits(((a & 3) << 4) | (b >> 4)));
+			if (src < end) {
+				unsigned char c;
+				c = *src++;
+				SET_DST(encode_bits(((b & 15) << 2) |
+								(c >> 6)));
+				SET_DST(encode_bits(c & 63));
+			} else {
+				SET_DST(encode_bits((b & 15) << 2));
+				SET_DST('=');
+			}
+		} else {
+			SET_DST(encode_bits(((a & 3) << 4)));
+			SET_DST('=');
+			SET_DST('=');
+		}
+		olen += 4;
+		line += 4;
+		if (line_width && line == line_width) {
+			line = 0;
+			SET_DST('\n');
+			olen++;
+		}
+	}
+	return olen;
+}
+
+int ceph_armor(char *dst, char * const dst_end, const char *src, const char *end)
+{
+	return ceph_armor_line_break(dst, dst_end, src, end, 0);
+}
+
+int ceph_unarmor(char *dst, char * const dst_end, const char *src, const char *end)
+{
+	int olen = 0;
+
+	while (src < end) {
+		int a, b, c, d;
+
+		if (src[0] == '\n') {
+			src++;
+			continue;
+		}
+
+		if (src + 4 > end)
+			return -EINVAL;
+		a = decode_bits(src[0]);
+		b = decode_bits(src[1]);
+		c = decode_bits(src[2]);
+		d = decode_bits(src[3]);
+		if (a < 0 || b < 0 || c < 0 || d < 0)
+			return -EINVAL;
+
+		SET_DST((a << 2) | (b >> 4));
+		if (src[2] == '=')
+			return olen + 1;
+		SET_DST(((b & 15) << 4) | (c >> 2));
+		if (src[3] == '=')
+			return olen + 2;
+		SET_DST(((c & 3) << 6) | d);
+		olen += 3;
+		src += 4;
+	}
+	return olen;
+}