sb 1-2

md_common.c

@@ -0,0 +1,72 @@
+#include <ctype.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "md5.h"
+#include "h.h"
+
+const char	*fromHextet	= "0123456789abcdefghjkmnpqrstuwxyz";
+
+static int
+asciiCode(int c)
+{
+	static const int fromAlpha[] = {
+		0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x10, 0x11, 1, 0x12, 0x13, 1,
+		0x14, 0x15, 0, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1b,
+		0x1c, 0x1d, 0x1e, 0x1f
+	};
+
+	if (c >= '0' && c <= '9')
+		return c - '0';
+	if (isupper(c))
+		c = tolower(c);
+	if (islower(c))
+		return fromAlpha[c - 'a'];
+	return -1;
+}
+
+char *
+BSCanon(const char *s)
+{
+	char *ret;
+	int c;
+
+	ret = malloc(strlen(s) + 1);
+	if (ret == NULL)
+		die("malloc");
+	strcpy(ret, s);
+
+	for (char *p = ret; *p; ++p) {
+		c = asciiCode(*p);
+		if (c != -1)
+			*p = fromHextet[c];
+	}
+
+	return ret;
+}
+
+void
+extmd(char md[static 7], unsigned int nstr, ...)
+{
+	char *str;
+	MD5_CTX ctx;
+	char digest[MD5_DIGEST_LENGTH];
+	va_list ap;
+
+	MD5Init(&ctx);
+	va_start(ap, nstr);
+
+	for (unsigned int i = 0; i < nstr; ++i) {
+		str = va_arg(ap, char *);
+		MD5Update(&ctx, (const uint8_t *)str, strlen(str));
+	}
+
+	MD5Final(digest, &ctx);
+	for (size_t i = 0; i < 6; ++i)
+		md[i] = fromHextet[digest[i] & 0x1F];
+	md[6] = '\0';
+}
+