~ecryptfs/ecryptfs/trunk : contents of src/testcases/filename-encryption.c at revision 707

~ecryptfs/ecryptfs/trunk : (revision 707)

59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	1	#include <stdio.h>
	2	#include <string.h>
195 by Mike Halcrow Update userspace filename crypto test code.	3	#include <errno.h>
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	4
	5	#define u8 unsigned char
	6
	7	/**
	8	* Temporary holding place for functions relating to filename
	9	* encryption
	10	*/
	11
	12	/* 64 characters forming a 6-bit target field */
195 by Mike Halcrow Update userspace filename crypto test code.	13	static unsigned char *portable_filename_chars = ("-.0123456789ABCD"
	14	"EFGHIJKLMNOPQRST"
	15	"UVWXYZabcdefghij"
	16	"klmnopqrstuvwxyz");
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	17
195 by Mike Halcrow Update userspace filename crypto test code.	18	static unsigned char filename_rev_map[] = {
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	19	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 7 */
	20	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 15 */
	21	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 23 */
	22	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 31 */
	23	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 39 */
	24	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, /* 47 */
	25	0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, /* 55 */
195 by Mike Halcrow Update userspace filename crypto test code.	26	0x0A, 0x0B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 63 */
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	27	0x00, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, /* 71 */
	28	0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, /* 79 */
	29	0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, /* 87 */
	30	0x23, 0x24, 0x25, 0x00, 0x00, 0x00, 0x00, 0x00, /* 95 */
	31	0x00, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, /* 103 */
	32	0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, /* 111 */
	33	0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, /* 119 */
	34	0x3D, 0x3E, 0x3F
	35	};
	36
	37	/**
	38	* ecryptfs_encode_for_filename
	39	* @src_size Size of the source in bytes
	40	*
	41	*/
195 by Mike Halcrow Update userspace filename crypto test code.	42	int ecryptfs_encode_for_filename(unsigned char dst, size_t dst_size,
	43	unsigned char *src, size_t src_size)
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	44	{
195 by Mike Halcrow Update userspace filename crypto test code.	45	size_t num_blocks;
	46	size_t block_num = 0;
	47	unsigned char last_block[3];
	48	size_t dst_offset = 0;
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	49	int rc = 0;
	50
195 by Mike Halcrow Update userspace filename crypto test code.	51	if (src_size == 0) {
	52	rc = -EINVAL;
	53	goto out;
	54	}
	55	num_blocks = (src_size / 3);
	56	if ((src_size % 3) == 0) {
	57	memcpy(last_block, (&src[src_size - 3]), 3);
	58	} else {
	59	num_blocks++;
	60	last_block[2] = 0x00;
	61	switch(src_size % 3) {
	62	case 1:
	63	last_block[0] = src[src_size - 1];
	64	last_block[1] = 0x00;
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	65	break;
	66	case 2:
195 by Mike Halcrow Update userspace filename crypto test code.	67	last_block[0] = src[src_size - 2];
	68	last_block[1] = src[src_size - 1];
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	69	}
195 by Mike Halcrow Update userspace filename crypto test code.	70	}
	71	(dst_size) = (num_blocks 4);
	72	if (!dst)
	73	goto out;
	74	while (block_num < num_blocks) {
	75	unsigned char *src_block;
	76	unsigned char dst_block[4];
	77
	78	if (block_num == (num_blocks - 1))
	79	src_block = last_block;
	80	else
	81	src_block = &src[block_num * 3];
	82	dst_block[0] = ((src_block[0] >> 2) & 0x3f);
	83	dst_block[1] = (((src_block[0] << 4) & 0x30)
	84	\| ((src_block[1] >> 4) & 0x0f));
	85	dst_block[2] = (((src_block[1] << 2) & 0x3c)
	86	\| ((src_block[2] >> 6) & 0x03));
	87	dst_block[3] = (src_block[2] & 0x3f);
	88	dst[dst_offset++] = portable_filename_chars[dst_block[0]];
	89	dst[dst_offset++] = portable_filename_chars[dst_block[1]];
	90	dst[dst_offset++] = portable_filename_chars[dst_block[2]];
	91	dst[dst_offset++] = portable_filename_chars[dst_block[3]];
	92	block_num++;
	93	}
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	94	out:
	95	return rc;
	96	}
	97
195 by Mike Halcrow Update userspace filename crypto test code.	98	int ecryptfs_decode_from_filename(unsigned char dst, size_t dst_size,
	99	unsigned char *src, size_t src_size)
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	100	{
	101	size_t src_byte_offset = 0;
	102	size_t dst_byte_offset = 0;
	103	u8 current_bit_offset = 0;
	104	int rc = 0;
	105
	106	while (src_byte_offset < src_size) {
	107	src[src_byte_offset] = filename_rev_map[src[src_byte_offset]];
	108	switch (current_bit_offset) {
	109	case 0:
	110	dst[dst_byte_offset] = (src[src_byte_offset] << 2);
	111	current_bit_offset = 6;
	112	break;
	113	case 6:
	114	dst[dst_byte_offset++] \|= (src[src_byte_offset] >> 4);
	115	dst[dst_byte_offset] = ((src[src_byte_offset] & 0xF)
	116	<< 4);
	117	current_bit_offset = 4;
	118	break;
	119	case 4:
	120	dst[dst_byte_offset++] \|= (src[src_byte_offset] >> 2);
	121	dst[dst_byte_offset] = (src[src_byte_offset] << 6);
	122	current_bit_offset = 2;
	123	break;
	124	case 2:
	125	dst[dst_byte_offset++] \|= (src[src_byte_offset]);
	126	dst[dst_byte_offset] = 0;
	127	current_bit_offset = 0;
	128	break;
	129	}
	130	src_byte_offset++;
	131	}
	132	(*dst_size) = dst_byte_offset;
	133	out:
	134	return rc;
	135	}
	136
	137
	138
195 by Mike Halcrow Update userspace filename crypto test code.	139	/* char *str = "This is a test of the eCryptfs packet encoding
	140	* code. If this were an actual chunk of kernel code, your video card
	141	* would spout 6-inch flames and your neighbor's inodes would flash
	142	* your television's BIOS."; */
	143
	144	unsigned char str[43] = { 0x46, 0x29, 0x7f, 0xa0, 0x6f, 0x4b, 0x66, 0xfc,
	145	0xde, 0x02, 0x07, 0xf8, 0x31, 0x61, 0xb2, 0xee,
	146	0x65, 0x9e, 0x68, 0xdf, 0x81, 0x0b, 0x54, 0x70,
	147	0x0c, 0x2c, 0xe6, 0xf4, 0x79, 0xb7, 0xd3, 0xbf,
	148	0xa5, 0x96, 0x11, 0x11, 0xf5, 0xc1, 0x5b, 0x87,
	149	0x16, 0x4e, 0xed };
	150
	151	/*unsigned char encoded[61] = {
	152	0x46, 0x29, 0x7f, 0xa0, 0x6f, 0x4b, 0x66, 0xfc, 0xde, 0x02, 0x07, 0xaf, 0x33, 0xdc, 0xf4, 0xfd,
	153	0xa1, 0x40, 0xf2, 0x77, 0x86, 0xfa, 0x86, 0xbc, 0x48, 0xed, 0x26, 0x75, 0xc2, 0x9a, 0x7d, 0xf7,
	154	0x42, 0x27, 0xfe, 0x55, 0xa7, 0x4e, 0x3b, 0x4a, 0xb3, 0x2a, 0xc7, 0x00, 0x00
	155
	156	}; */
	157
	158	unsigned char *encoded = "";
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	159
	160	int main()
	161	{
	162	char enc[1024];
	163	char dec[1024];
	164	size_t enc_size;
	165	size_t dec_size;
	166	int i;
	167	int rc = 0;
	168
195 by Mike Halcrow Update userspace filename crypto test code.	169	ecryptfs_encode_for_filename(NULL, &enc_size, str, 43);
	170	printf("enc_size = [%d]\n", enc_size);
	171	ecryptfs_encode_for_filename(enc, &enc_size, str, 43);
	172	enc[enc_size] = '\0';
	173	printf("Encoded: [%s]\n", enc);
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	174	ecryptfs_decode_from_filename(dec, &dec_size, enc, enc_size);
195 by Mike Halcrow Update userspace filename crypto test code.	175	printf("Decoded:\n");
	176	for (i = 0; i < dec_size; i++) {
	177	if ((i % 16) == 0)
	178	printf("\n");
	179	printf("0x%.2x.", (unsigned char)dec[i]);
	180	}
	181	printf("\n");
59 by mike@halcrow.us Some functions to facilitate encoding and decoding arbitrary binary	182	out:
	183	return rc;
	184	}