ckolivas/lrzip
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Centralise where all encryption/decryption is done, and whether to carry over the IV or not.

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This commit is contained in:
ckolivas 2011-03-17 14:10:58 +11:00
parent 9d496236c5
commit 4bc23ee001
5 changed files with 71 additions and 88 deletions
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13
runzip.c
View file

@ -376,17 +376,8 @@ i64 runzip_fd(rzip_control *control, int fd_in, int fd_out, int fd_hist, i64 exp
if (unlikely(read_1g(control, fd_in, md5_stored, MD5_DIGEST_SIZE) != MD5_DIGEST_SIZE))
fatal("Failed to read md5 data in runzip_fd\n");
if (ENCRYPT) {
/* Even the MD5 value is stored encrypted */
uchar *dec_buf = malloc(MD5_DIGEST_SIZE);
if (unlikely(aes_crypt_cbc(&control->aes_ctx, AES_DECRYPT,
MD5_DIGEST_SIZE, control->hash_iv, md5_stored, dec_buf)))
failure("Failed to aes_crypt_cbc in runzip_fd\n");
for (i = 0; i < MD5_DIGEST_SIZE; i++)
md5_stored[i] = dec_buf[i];
free(dec_buf);
}
if (ENCRYPT)
lrz_crypt(control, md5_stored, MD5_DIGEST_SIZE, 0, 1);
for (i = 0; i < MD5_DIGEST_SIZE; i++)
if (md5_stored[i] != md5_resblock[i]) {
print_output("MD5 CHECK FAILED.\nStored:");

17
rzip.c
View file

@ -976,19 +976,10 @@ retry:
print_output("%02x", md5_resblock[j] & 0xFF);
print_output("\n");
}
if (ENCRYPT) {
/* When encrypting data, we encrypt the MD5 value as well */
uchar *enc_buf = malloc(MD5_DIGEST_SIZE);
if (unlikely(!enc_buf))
fatal("Failed to malloc enc_buf in rzip_fd\n");
if (unlikely(aes_crypt_cbc(&control->aes_ctx, AES_ENCRYPT,
MD5_DIGEST_SIZE, control->hash_iv, md5_resblock, enc_buf)))
failure("Failed to aes_crypt_cbc in rzip_fd\n");
if (unlikely(write_1g(control, enc_buf, MD5_DIGEST_SIZE) != MD5_DIGEST_SIZE))
fatal("Failed to write encrypted md5 in rzip_fd\n");
free(enc_buf);
} else if (unlikely(write_1g(control, md5_resblock, MD5_DIGEST_SIZE) != MD5_DIGEST_SIZE))
/* When encrypting data, we encrypt the MD5 value as well */
if (ENCRYPT)
lrz_crypt(control, md5_resblock, MD5_DIGEST_SIZE, 1, 1);
if (unlikely(write_1g(control, md5_resblock, MD5_DIGEST_SIZE) != MD5_DIGEST_SIZE))
fatal("Failed to write md5 in rzip_fd\n");
if (TMP_OUTBUF)

68
stream.c
View file

@ -1183,32 +1183,8 @@ retry:
get_rand(cti->s_buf + cti->c_len, MIN_SIZE - cti->c_len);
}
if (!ret && ENCRYPT) {
/* Encryption requires CBC_LEN blocks so we can use ciphertext
* stealing to not have to pad the block */
unsigned char ivec[CBC_LEN], tmp0[CBC_LEN], tmp1[CBC_LEN];
i64 N, M;
mlock(ivec, CBC_LEN);
memcpy(ivec, control->hash_iv, CBC_LEN);
M = padded_len % CBC_LEN;
N = padded_len - M;
print_maxverbose("Encrypting block \n");
aes_crypt_cbc(&control->aes_ctx, AES_ENCRYPT, N, ivec,
cti->s_buf, cti->s_buf);
if (M) {
memset(tmp0, 0, sizeof(tmp0));
memcpy(tmp0, cti->s_buf + N, M);
aes_crypt_cbc(&control->aes_ctx, AES_ENCRYPT, CBC_LEN,
ivec, tmp0, tmp1);
memcpy(cti->s_buf + N, cti->s_buf + N - CBC_LEN, M);
memcpy(cti->s_buf + N - CBC_LEN, tmp1, CBC_LEN);
}
memset(ivec, 0, CBC_LEN);
munlock(ivec, CBC_LEN);
}
if (!ret && ENCRYPT)
lrz_crypt(control, cti->s_buf, padded_len, 1, 0);
/* If compression fails for whatever reason multithreaded, then wait
* for the previous thread to finish, serialising the work to decrease
@ -1397,15 +1373,6 @@ retry:
return 0;
}
static void xor128 (void *pa, const void *pb)
{
i64 *a = pa;
const i64 *b = pb;
a [0] ^= b [0];
a [1] ^= b [1];
}
/* fill a buffer from a stream - return -1 on failure */
static int fill_buffer(rzip_control *control, struct stream_info *sinfo, int streamno)
{
@ -1463,35 +1430,8 @@ fill_another:
if (unlikely(read_buf(control, sinfo->fd, s_buf, padded_len)))
return -1;
if (ENCRYPT) {
unsigned char ivec[CBC_LEN], tmp0[CBC_LEN], tmp1[CBC_LEN];
i64 N, M;
mlock(ivec, CBC_LEN);
memcpy(ivec, control->hash_iv, CBC_LEN);
M = padded_len % CBC_LEN;
N = padded_len - M;
print_maxverbose("Decrypting block \n");
if (M) {
aes_crypt_cbc(&control->aes_ctx, AES_DECRYPT, N - CBC_LEN,
ivec, s_buf, s_buf);
aes_crypt_ecb(&control->aes_ctx, AES_DECRYPT,
s_buf + N - CBC_LEN, tmp0);
memset(tmp1, 0, CBC_LEN);
memcpy(tmp1, s_buf + N, M);
xor128(tmp0, tmp1);
memcpy(s_buf + N, tmp0, M);
memcpy(tmp1 + M, tmp0 + M, CBC_LEN - M);
aes_crypt_ecb(&control->aes_ctx, AES_DECRYPT, tmp1,
s_buf + N - CBC_LEN);
xor128(s_buf + N - CBC_LEN, ivec);
} else
aes_crypt_cbc(&control->aes_ctx, AES_DECRYPT, padded_len,
ivec, s_buf, s_buf);
memset(ivec, 0, CBC_LEN);
munlock(ivec, CBC_LEN);
}
if (ENCRYPT)
lrz_crypt(control, s_buf, padded_len, 0, 0);
ucthread[s->uthread_no].s_buf = s_buf;
ucthread[s->uthread_no].c_len = c_len;

60
util.c
View file

@ -150,3 +150,63 @@ void get_rand(uchar *buf, int len)
fatal("Failed to close fd in get_rand\n");
}
}
static void xor128 (void *pa, const void *pb)
{
i64 *a = pa;
const i64 *b = pb;
a [0] ^= b [0];
a [1] ^= b [1];
}
void lrz_crypt(rzip_control *control, uchar *buf, i64 len, int encrypt, int carry_iv)
{
/* Encryption requires CBC_LEN blocks so we can use ciphertext
* stealing to not have to pad the block */
unsigned char ivec[CBC_LEN], tmp0[CBC_LEN], tmp1[CBC_LEN];
i64 N, M;
mlock(ivec, CBC_LEN);
memcpy(ivec, control->hash_iv, CBC_LEN);
M = len % CBC_LEN;
N = len - M;
if (encrypt) {
print_maxverbose("Encrypting data \n");
aes_crypt_cbc(&control->aes_ctx, AES_ENCRYPT, N, ivec, buf, buf);
if (M) {
memset(tmp0, 0, sizeof(tmp0));
memcpy(tmp0, buf + N, M);
aes_crypt_cbc(&control->aes_ctx, AES_ENCRYPT, CBC_LEN,
ivec, tmp0, tmp1);
memcpy(buf + N, buf + N - CBC_LEN, M);
memcpy(buf + N - CBC_LEN, tmp1, CBC_LEN);
}
} else {
print_maxverbose("Decrypting data \n");
if (M) {
aes_crypt_cbc(&control->aes_ctx, AES_DECRYPT, N - CBC_LEN,
ivec, buf, buf);
aes_crypt_ecb(&control->aes_ctx, AES_DECRYPT,
buf + N - CBC_LEN, tmp0);
memset(tmp1, 0, CBC_LEN);
memcpy(tmp1, buf + N, M);
xor128(tmp0, tmp1);
memcpy(buf + N, tmp0, M);
memcpy(tmp1 + M, tmp0 + M, CBC_LEN - M);
aes_crypt_ecb(&control->aes_ctx, AES_DECRYPT, tmp1,
buf + N - CBC_LEN);
xor128(buf + N - CBC_LEN, ivec);
} else
aes_crypt_cbc(&control->aes_ctx, AES_DECRYPT, len,
ivec, buf, buf);
}
/* The carry_iv flag tells us if we want to update the value in
* control->hash_iv for later encryption */
if (carry_iv)
memcpy(control->hash_iv, ivec, CBC_LEN);
memset(ivec, 0, CBC_LEN);
munlock(ivec, CBC_LEN);
}

1
util.h
View file

@ -29,5 +29,6 @@ void fatal(const char *format, ...);
void failure(const char *format, ...);
void round_to_page(i64 *size);
void get_rand(uchar *buf, int len);
void lrz_crypt(rzip_control *control, uchar *buf, i64 len, int encrypt, int carry_iv);
#endif