Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 266 insertions, 0 deletions

diff --git a/src/util/base32_code.c b/src/util/base32_code.c
new file mode 100644
index 0000000..31566ea
--- /dev/null
+++ b/src/util/base32_code.c
@@ -0,0 +1,266 @@
+/*++
+/* NAME
+/*	base32_code 3
+/* SUMMARY
+/*	encode/decode data, base 32 style
+/* SYNOPSIS
+/*	#include <base32_code.h>
+/*
+/*	VSTRING	*base32_encode(result, in, len)
+/*	VSTRING	*result;
+/*	const char *in;
+/*	ssize_t	len;
+/*
+/*	VSTRING	*base32_decode(result, in, len)
+/*	VSTRING	*result;
+/*	const char *in;
+/*	ssize_t	len;
+/* DESCRIPTION
+/*	base32_encode() takes a block of len bytes and encodes it as one
+/*	null-terminated string.  The result value is the result argument.
+/*
+/*	base32_decode() performs the opposite transformation. The result
+/*	value is the result argument. The result is null terminated, whether
+/*	or not that makes sense.
+/* DIAGNOSTICS
+/*	base32_decode() returns a null pointer when the input contains
+/*	characters not in the base 32 alphabet.
+/* SEE ALSO
+/*	RFC 4648; padding is strictly enforced
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include "sys_defs.h"
+#include <ctype.h>
+#include <string.h>
+#include <limits.h>
+
+#ifndef UCHAR_MAX
+#define UCHAR_MAX 0xff
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstring.h>
+#include <base32_code.h>
+
+/* Application-specific. */
+
+static unsigned char to_b32[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
+
+#define UNSIG_CHAR_PTR(x) ((unsigned char *)(x))
+
+/* base32_encode - raw data to encoded */
+
+VSTRING *base32_encode(VSTRING *result, const char *in, ssize_t len)
+{
+    const unsigned char *cp;
+    ssize_t count;
+    static int pad_count[] = {0, 6, 4, 3, 1};
+
+    /*
+     * Encode 5 -> 8.
+     */
+    VSTRING_RESET(result);
+    for (cp = UNSIG_CHAR_PTR(in), count = len; count > 0; count -= 5, cp += 5) {
+	VSTRING_ADDCH(result, to_b32[cp[0] >> 3]);
+	if (count < 2) {
+	    VSTRING_ADDCH(result, to_b32[(cp[0] & 0x7) << 2]);
+	    break;
+	}
+	VSTRING_ADDCH(result, to_b32[(cp[0] & 0x7) << 2 | cp[1] >> 6]);
+	VSTRING_ADDCH(result, to_b32[(cp[1] & 0x3f) >> 1]);
+	if (count < 3) {
+	    VSTRING_ADDCH(result, to_b32[(cp[1] & 0x1) << 4]);
+	    break;
+	}
+	VSTRING_ADDCH(result, to_b32[(cp[1] & 0x1) << 4 | cp[2] >> 4]);
+	if (count < 4) {
+	    VSTRING_ADDCH(result, to_b32[(cp[2] & 0xf) << 1]);
+	    break;
+	}
+	VSTRING_ADDCH(result, to_b32[(cp[2] & 0xf) << 1 | cp[3] >> 7]);
+	VSTRING_ADDCH(result, to_b32[(cp[3] & 0x7f) >> 2]);
+	if (count < 5) {
+	    VSTRING_ADDCH(result, to_b32[(cp[3] & 0x3) << 3]);
+	    break;
+	}
+	VSTRING_ADDCH(result, to_b32[(cp[3] & 0x3) << 3 | cp[4] >> 5]);
+	VSTRING_ADDCH(result, to_b32[cp[4] & 0x1f]);
+    }
+    if (count > 0)
+	vstring_strncat(result, "======", pad_count[count]);
+    VSTRING_TERMINATE(result);
+    return (result);
+}
+
+/* base32_decode - encoded data to raw */
+
+VSTRING *base32_decode(VSTRING *result, const char *in, ssize_t len)
+{
+    static unsigned char *un_b32 = 0;
+    const unsigned char *cp;
+    ssize_t count;
+    unsigned int ch0;
+    unsigned int ch1;
+    unsigned int ch2;
+    unsigned int ch3;
+    unsigned int ch4;
+    unsigned int ch5;
+    unsigned int ch6;
+    unsigned int ch7;
+
+#define CHARS_PER_BYTE		(UCHAR_MAX + 1)
+#define INVALID			0xff
+#if 1
+#define ENFORCE_LENGTH(x)	(x)
+#define ENFORCE_PADDING(x)	(x)
+#define ENFORCE_NULL_BITS(x)	(x)
+#else
+#define ENFORCE_LENGTH(x)	(1)
+#define ENFORCE_PADDING(x)	(1)
+#define ENFORCE_NULL_BITS(x)	(1)
+#endif
+
+    /*
+     * Sanity check.
+     */
+    if (ENFORCE_LENGTH(len % 8))
+	return (0);
+
+    /*
+     * Once: initialize the decoding lookup table on the fly.
+     */
+    if (un_b32 == 0) {
+	un_b32 = (unsigned char *) mymalloc(CHARS_PER_BYTE);
+	memset(un_b32, INVALID, CHARS_PER_BYTE);
+	for (cp = to_b32; cp < to_b32 + sizeof(to_b32) - 1; cp++)
+	    un_b32[*cp] = cp - to_b32;
+    }
+
+    /*
+     * Decode 8 -> 5.
+     */
+    VSTRING_RESET(result);
+    for (cp = UNSIG_CHAR_PTR(in), count = 0; count < len; count += 8) {
+	if ((ch0 = un_b32[*cp++]) == INVALID
+	    || (ch1 = un_b32[*cp++]) == INVALID)
+	    return (0);
+	VSTRING_ADDCH(result, ch0 << 3 | ch1 >> 2);
+	if ((ch2 = *cp++) == '='
+	    && ENFORCE_PADDING(strcmp((char *) cp, "=====") == 0)
+	    && ENFORCE_NULL_BITS((ch1 & 0x3) == 0))
+	    break;
+	if ((ch2 = un_b32[ch2]) == INVALID)
+	    return (0);
+	if ((ch3 = un_b32[*cp++]) == INVALID)
+	    return (0);
+	VSTRING_ADDCH(result, ch1 << 6 | ch2 << 1 | ch3 >> 4);
+	if ((ch4 = *cp++) == '='
+	    && ENFORCE_PADDING(strcmp((char *) cp, "===") == 0)
+	    && ENFORCE_NULL_BITS((ch3 & 0xf) == 0))
+	    break;
+	if ((ch4 = un_b32[ch4]) == INVALID)
+	    return (0);
+	VSTRING_ADDCH(result, ch3 << 4 | ch4 >> 1);
+	if ((ch5 = *cp++) == '='
+	    && ENFORCE_PADDING(strcmp((char *) cp, "==") == 0)
+	    && ENFORCE_NULL_BITS((ch4 & 0x1) == 0))
+	    break;
+	if ((ch5 = un_b32[ch5]) == INVALID)
+	    return (0);
+	if ((ch6 = un_b32[*cp++]) == INVALID)
+	    return (0);
+	VSTRING_ADDCH(result, ch4 << 7 | ch5 << 2 | ch6 >> 3);
+	if ((ch7 = *cp++) == '='
+	    && ENFORCE_NULL_BITS((ch6 & 0x7) == 0))
+	    break;
+	if ((ch7 = un_b32[ch7]) == INVALID)
+	    return (0);
+	VSTRING_ADDCH(result, ch6 << 5 | ch7);
+    }
+    VSTRING_TERMINATE(result);
+    return (result);
+}
+
+#ifdef TEST
+
+ /*
+  * Proof-of-concept test program: convert to base 32 and back.
+  */
+
+#define STR(x)	vstring_str(x)
+#define LEN(x)	VSTRING_LEN(x)
+
+int     main(int unused_argc, char **unused_argv)
+{
+    VSTRING *b1 = vstring_alloc(1);
+    VSTRING *b2 = vstring_alloc(1);
+    VSTRING *test = vstring_alloc(1);
+    int     i, j;
+
+    /*
+     * Test all byte values (except null) on all byte positions.
+     */
+    for (j = 0; j < 256; j++)
+	for (i = 1; i < 256; i++)
+	    VSTRING_ADDCH(test, i);
+    VSTRING_TERMINATE(test);
+
+#define DECODE(b,x,l) { \
+	if (base32_decode((b),(x),(l)) == 0) \
+	    msg_panic("bad base32: %s", (x)); \
+    }
+#define VERIFY(b,t,l) { \
+	if (memcmp((b), (t), (l)) != 0) \
+	    msg_panic("bad test: %s", (b)); \
+    }
+
+    /*
+     * Test all padding variants.
+     */
+    for (i = 1; i <= 8; i++) {
+	base32_encode(b1, STR(test), LEN(test));
+	DECODE(b2, STR(b1), LEN(b1));
+	VERIFY(STR(b2), STR(test), LEN(test));
+
+	base32_encode(b1, STR(test), LEN(test));
+	base32_encode(b2, STR(b1), LEN(b1));
+	base32_encode(b1, STR(b2), LEN(b2));
+	DECODE(b2, STR(b1), LEN(b1));
+	DECODE(b1, STR(b2), LEN(b2));
+	DECODE(b2, STR(b1), LEN(b1));
+	VERIFY(STR(b2), STR(test), LEN(test));
+
+	base32_encode(b1, STR(test), LEN(test));
+	base32_encode(b2, STR(b1), LEN(b1));
+	base32_encode(b1, STR(b2), LEN(b2));
+	base32_encode(b2, STR(b1), LEN(b1));
+	base32_encode(b1, STR(b2), LEN(b2));
+	DECODE(b2, STR(b1), LEN(b1));
+	DECODE(b1, STR(b2), LEN(b2));
+	DECODE(b2, STR(b1), LEN(b1));
+	DECODE(b1, STR(b2), LEN(b2));
+	DECODE(b2, STR(b1), LEN(b1));
+	VERIFY(STR(b2), STR(test), LEN(test));
+	vstring_truncate(test, LEN(test) - 1);
+    }
+    vstring_free(test);
+    vstring_free(b1);
+    vstring_free(b2);
+    return (0);
+}
+
+#endif