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- Computed invalid J0 buffer if IV's != length 12

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- Computed invalid GCM hash in AES_GCM_ghash(). Last 15 byte logic was partially incorrect. Worked for length % 16 = 8, but not length % 16 = 5
- Get rid of all byte swaps
This commit is contained in:
Jens Steube 2021-04-09 16:35:32 +02:00
parent 57213e6c6c
commit 55e3952815
2 changed files with 92 additions and 131 deletions
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207
OpenCL/inc_cipher_aes-gcm.cl
View File

@ -63,78 +63,23 @@ DECLSPEC void AES_GCM_gf_mult (const u32 *x, const u32 *y, u32 *z)
}
}
DECLSPEC void AES_GCM_ghash (const u32 *subkey, const u32 *in, u32 in_len, u32 *out)
DECLSPEC void AES_GCM_ghash (const u32 *subkey, const u32 *in, int in_len, u32 *out)
{
u32 m = in_len / 16;
int i;
int j;
const u32 *xpos = in;
u32 tmp[4] = { 0 };
for (u32 i = 0; i < m; i++)
{
AES_GCM_xor_block (out, xpos);
xpos += 4;
AES_GCM_gf_mult (out, subkey, tmp);
out[0] = tmp[0];
out[1] = tmp[1];
out[2] = tmp[2];
out[3] = tmp[3];
}
if (in + (in_len/4) > xpos)
{
u32 last = in + (in_len/4) - xpos;
for (u32 i = 0; i < last; i++)
{
tmp[i] = xpos[i];
}
for (u32 i = last; i < 4; i++)
{
tmp[i] = 0;
}
AES_GCM_xor_block (out, tmp);
AES_GCM_gf_mult (out, subkey, tmp);
tmp[0] = hc_swap32_S (tmp[0]);
tmp[1] = hc_swap32_S (tmp[1]);
tmp[2] = hc_swap32_S (tmp[2]);
tmp[3] = hc_swap32_S (tmp[3]);
out[0] = tmp[0];
out[1] = tmp[1];
out[2] = tmp[2];
out[3] = tmp[3];
}
}
DECLSPEC void AES_GCM_ghash_global (const u32 *subkey, GLOBAL_AS const u32 *in, u32 in_len, u32 *out)
{
u32 m = in_len / 16;
GLOBAL_AS const u32 *xpos = in;
u32 tmp[4] = { 0 };
for (u32 i = 0; i < m; i++)
for (i = 0, j = 0; i < in_len - 15; i += 16, j += 4)
{
u32 t2[4];
t2[0] = xpos[0];
t2[1] = xpos[1];
t2[2] = xpos[2];
t2[3] = xpos[3];
t2[0] = in[j + 0];
t2[1] = in[j + 1];
t2[2] = in[j + 2];
t2[3] = in[j + 3];
AES_GCM_xor_block (out, t2);
xpos += 4;
u32 tmp[4];
AES_GCM_gf_mult (out, subkey, tmp);
@ -144,29 +89,23 @@ DECLSPEC void AES_GCM_ghash_global (const u32 *subkey, GLOBAL_AS const u32 *in,
out[3] = tmp[3];
}
if (in + (in_len/4) > xpos)
const int left = in_len - i;
if (left > 0)
{
u32 last = in + (in_len/4) - xpos;
u32 t2[4];
for (u32 i = 0; i < last; i++)
{
tmp[i] = xpos[i];
}
t2[0] = (left > 0) ? in[j + 0] : 0;
t2[1] = (left > 4) ? in[j + 1] : 0;
t2[2] = (left > 8) ? in[j + 2] : 0;
t2[3] = (left > 12) ? in[j + 3] : 0;
for (u32 i = last; i < 4; i++)
{
tmp[i] = 0;
}
AES_GCM_xor_block (out, t2);
AES_GCM_xor_block (out, tmp);
u32 tmp[4];
AES_GCM_gf_mult (out, subkey, tmp);
tmp[0] = hc_swap32_S (tmp[0]);
tmp[1] = hc_swap32_S (tmp[1]);
tmp[2] = hc_swap32_S (tmp[2]);
tmp[3] = hc_swap32_S (tmp[3]);
out[0] = tmp[0];
out[1] = tmp[1];
out[2] = tmp[2];
@ -174,7 +113,57 @@ DECLSPEC void AES_GCM_ghash_global (const u32 *subkey, GLOBAL_AS const u32 *in,
}
}
DECLSPEC void AES_GCM_Init (const u32 *ukey, u32 key_len, u32 *key, u32 *subkey, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
DECLSPEC void AES_GCM_ghash_global (const u32 *subkey, GLOBAL_AS const u32 *in, int in_len, u32 *out)
{
int i;
int j;
for (i = 0, j = 0; i < in_len - 15; i += 16, j += 4)
{
u32 t2[4];
t2[0] = in[j + 0];
t2[1] = in[j + 1];
t2[2] = in[j + 2];
t2[3] = in[j + 3];
AES_GCM_xor_block (out, t2);
u32 tmp[4];
AES_GCM_gf_mult (out, subkey, tmp);
out[0] = tmp[0];
out[1] = tmp[1];
out[2] = tmp[2];
out[3] = tmp[3];
}
const int left = in_len - i;
if (left > 0)
{
u32 t2[4];
t2[0] = (left > 0) ? in[j + 0] : 0;
t2[1] = (left > 4) ? in[j + 1] : 0;
t2[2] = (left > 8) ? in[j + 2] : 0;
t2[3] = (left > 12) ? in[j + 3] : 0;
AES_GCM_xor_block (out, t2);
u32 tmp[4];
AES_GCM_gf_mult (out, subkey, tmp);
out[0] = tmp[0];
out[1] = tmp[1];
out[2] = tmp[2];
out[3] = tmp[3];
}
}
DECLSPEC void AES_GCM_Init (const u32 *ukey, int key_len, u32 *key, u32 *subkey, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
{
if (key_len == 128)
{
@ -196,7 +185,7 @@ DECLSPEC void AES_GCM_Init (const u32 *ukey, u32 key_len, u32 *key, u32 *subkey,
}
}
DECLSPEC void AES_GCM_Prepare_J0 (const u32 *iv, u32 iv_len, const u32 *subkey, u32 *J0)
DECLSPEC void AES_GCM_Prepare_J0 (const u32 *iv, int iv_len, const u32 *subkey, u32 *J0)
{
if (iv_len == 12)
{
@ -207,23 +196,19 @@ DECLSPEC void AES_GCM_Prepare_J0 (const u32 *iv, u32 iv_len, const u32 *subkey,
}
else
{
J0[0] = iv[0];
J0[1] = iv[1];
J0[2] = iv[2];
J0[3] = iv[3];
AES_GCM_gf_mult (iv, subkey, J0);
u32 len_buf[4];
u32 len_buf[4] = { 0 };
len_buf[0] = 0;
len_buf[1] = 0;
len_buf[2] = 0;
len_buf[3] = iv_len * 8;
AES_GCM_ghash (subkey, len_buf, 16, J0);
AES_GCM_xor_block (len_buf, J0);
AES_GCM_gf_mult (len_buf, subkey, J0);
}
}
DECLSPEC void AES_GCM_gctr (const u32 *key, const u32 *iv, const u32 *in, u32 in_len, u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
DECLSPEC void AES_GCM_gctr (const u32 *key, const u32 *iv, const u32 *in, int in_len, u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
{
const u32 *xpos = in;
@ -236,7 +221,7 @@ DECLSPEC void AES_GCM_gctr (const u32 *key, const u32 *iv, const u32 *in, u32 in
iv_buf[2] = iv[2];
iv_buf[3] = iv[3];
const u32 n = in_len / 16;
const int n = in_len / 16;
for (u32 i = 0; i < n; i++)
{
@ -250,7 +235,9 @@ DECLSPEC void AES_GCM_gctr (const u32 *key, const u32 *iv, const u32 *in, u32 in
AES_GCM_inc32 (iv_buf);
}
u32 last = in + (in_len/4) - xpos;
// this is not byte accurate but 4-byte accurate. needs fix?
int last = in + (in_len/4) - xpos;
if (last)
{
@ -264,7 +251,7 @@ DECLSPEC void AES_GCM_gctr (const u32 *key, const u32 *iv, const u32 *in, u32 in
}
}
DECLSPEC void AES_GCM_GCTR (u32 *key, u32 *J0, const u32 *in, u32 in_len, u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
DECLSPEC void AES_GCM_GCTR (u32 *key, u32 *J0, const u32 *in, int in_len, u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
{
u32 J0_incr[4];
@ -276,7 +263,7 @@ DECLSPEC void AES_GCM_GCTR (u32 *key, u32 *J0, const u32 *in, u32 in_len, u32 *o
AES_GCM_gctr (key, J0_incr, in, in_len, out, s_te0, s_te1, s_te2, s_te3, s_te4);
}
DECLSPEC void AES_GCM_GHASH (const u32 *subkey, const u32 *aad_buf, u32 aad_len, const u32 *enc_buf, u32 enc_len, u32 *out)
DECLSPEC void AES_GCM_GHASH (const u32 *subkey, const u32 *aad_buf, int aad_len, const u32 *enc_buf, int enc_len, u32 *out)
{
out[0] = 0;
out[1] = 0;
@ -285,21 +272,8 @@ DECLSPEC void AES_GCM_GHASH (const u32 *subkey, const u32 *aad_buf, u32 aad_len,
AES_GCM_ghash (subkey, aad_buf, aad_len, out);
// untested swap
/*
out[0] = hc_swap32_S (out[0]);
out[1] = hc_swap32_S (out[1]);
out[2] = hc_swap32_S (out[2]);
out[3] = hc_swap32_S (out[3]);
*/
AES_GCM_ghash (subkey, enc_buf, enc_len, out);
out[0] = hc_swap32_S (out[0]);
out[1] = hc_swap32_S (out[1]);
out[2] = hc_swap32_S (out[2]);
out[3] = hc_swap32_S (out[3]);
u32 len_buf[4];
len_buf[0] = aad_len * 8;
@ -310,7 +284,7 @@ DECLSPEC void AES_GCM_GHASH (const u32 *subkey, const u32 *aad_buf, u32 aad_len,
AES_GCM_ghash (subkey, len_buf, 16, out);
}
DECLSPEC void AES_GCM_GHASH_GLOBAL (const u32 *subkey, const u32 *aad_buf, u32 aad_len, GLOBAL_AS const u32 *enc_buf, u32 enc_len, u32 *out)
DECLSPEC void AES_GCM_GHASH_GLOBAL (const u32 *subkey, const u32 *aad_buf, int aad_len, GLOBAL_AS const u32 *enc_buf, int enc_len, u32 *out)
{
out[0] = 0;
out[1] = 0;
@ -319,21 +293,8 @@ DECLSPEC void AES_GCM_GHASH_GLOBAL (const u32 *subkey, const u32 *aad_buf, u32 a
AES_GCM_ghash (subkey, aad_buf, aad_len, out);
// untested swap
/*
out[0] = hc_swap32_S (out[0]);
out[1] = hc_swap32_S (out[1]);
out[2] = hc_swap32_S (out[2]);
out[3] = hc_swap32_S (out[3]);
*/
AES_GCM_ghash_global (subkey, enc_buf, enc_len, out);
out[0] = hc_swap32_S (out[0]);
out[1] = hc_swap32_S (out[1]);
out[2] = hc_swap32_S (out[2]);
out[3] = hc_swap32_S (out[3]);
u32 len_buf[4];
len_buf[0] = aad_len * 8;

16
OpenCL/inc_cipher_aes-gcm.h
View File

@ -9,13 +9,13 @@
DECLSPEC void AES_GCM_inc32 (u32 *block);
DECLSPEC void AES_GCM_xor_block (u32 *dst, const u32 *src);
DECLSPEC void AES_GCM_gf_mult (const u32 *x, const u32 *y, u32 *z);
DECLSPEC void AES_GCM_ghash (const u32 *subkey, const u32 *in, u32 in_len, u32 *out);
DECLSPEC void AES_GCM_ghash_global (const u32 *subkey, GLOBAL_AS const u32 *in, u32 in_len, u32 *out);
DECLSPEC void AES_GCM_Init (const u32 *ukey, u32 key_len, u32 *key, u32 *subkey, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4);
DECLSPEC void AES_GCM_Prepare_J0 (const u32 *iv, u32 iv_len, const u32 *subkey, u32 *J0);
DECLSPEC void AES_GCM_gctr (const u32 *key, const u32 *iv, const u32 *in, u32 in_len, u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4);
DECLSPEC void AES_GCM_GCTR (u32 *key, u32 *J0, const u32 *in, u32 in_len, u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4);
DECLSPEC void AES_GCM_GHASH (const u32 *subkey, const u32 *aad_buf, u32 aad_len, const u32 *enc_buf, u32 enc_len, u32 *out);
DECLSPEC void AES_GCM_GHASH_GLOBAL (const u32 *subkey, const u32 *aad_buf, u32 aad_len, GLOBAL_AS const u32 *enc_buf, u32 enc_len, u32 *out);
DECLSPEC void AES_GCM_ghash (const u32 *subkey, const u32 *in, int in_len, u32 *out);
DECLSPEC void AES_GCM_ghash_global (const u32 *subkey, GLOBAL_AS const u32 *in, int in_len, u32 *out);
DECLSPEC void AES_GCM_Init (const u32 *ukey, int key_len, u32 *key, u32 *subkey, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4);
DECLSPEC void AES_GCM_Prepare_J0 (const u32 *iv, int iv_len, const u32 *subkey, u32 *J0);
DECLSPEC void AES_GCM_gctr (const u32 *key, const u32 *iv, const u32 *in, int in_len, u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4);
DECLSPEC void AES_GCM_GCTR (u32 *key, u32 *J0, const u32 *in, int in_len, u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4);
DECLSPEC void AES_GCM_GHASH (const u32 *subkey, const u32 *aad_buf, int aad_len, const u32 *enc_buf, int enc_len, u32 *out);
DECLSPEC void AES_GCM_GHASH_GLOBAL (const u32 *subkey, const u32 *aad_buf, int aad_len, GLOBAL_AS const u32 *enc_buf, int enc_len, u32 *out);
#endif // _INC_CIPHER_AES_GCM_H