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added comments on speeding up the attack by reducing the ciphertext buffersize

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Your Name 2023-02-26 13:52:23 +01:00
parent 141b0289b1
commit dbe99851ec
2 changed files with 6 additions and 6 deletions
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2
OpenCL/m26610-pure.cl
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@ -34,7 +34,7 @@ typedef struct pbkdf2_sha256_aes_gcm
u32 salt_buf[64];
u32 iv_buf[4];
u32 iv_len;
u32 ct_buf[784];
u32 ct_buf[784]; // TODO this can be smaller and would speedup the attack, only 64 bytes of ciphertext are allowed
u32 ct_len;
} pbkdf2_sha256_aes_gcm_t;

10
src/modules/module_26610.c
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@ -60,7 +60,7 @@ typedef struct pbkdf2_sha256_aes_gcm
u32 salt_buf[64];
u32 iv_buf[4];
u32 iv_len;
u32 ct_buf[784];
u32 ct_buf[784]; // TODO this can be smaller and would speedup the attack, only 64 bytes of ciphertext are allowed
u32 ct_len;
} pbkdf2_sha256_aes_gcm_t;
@ -129,7 +129,7 @@ int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
pbkdf2_sha256_aes_gcm_t *metamask = (pbkdf2_sha256_aes_gcm_t *) esalt_buf;
#define CT_MAX_LEN_BASE64 (((3136+16) * 8) / 6) + 3
#define CT_MAX_LEN_BASE64 (((3136+16) * 8) / 6) + 3 // TODO this can be smaller and would speedup the attack, only 64 bytes of ciphertext are allowed
hc_token_t token;
@ -156,7 +156,7 @@ int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
token.sep[3] = '$';
token.len_min[3] = 32;
token.len_max[3] = 100;
token.len_max[3] = 100; // TODO this can be smaller and would speedup the attack, only 64 bytes of ciphertext are allowed
token.attr[3] = TOKEN_ATTR_VERIFY_LENGTH
| TOKEN_ATTR_VERIFY_BASE64A;
@ -221,7 +221,7 @@ int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
const u8 *ct_pos = token.buf[3];
const int ct_len = token.len[3];
memset (tmp_buf, 0, sizeof (tmp_buf));
memset (tmp_buf, 0, sizeof (tmp_buf));
tmp_len = base64_decode (base64_to_int, ct_pos, ct_len, tmp_buf);
@ -278,7 +278,7 @@ int module_hash_encode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
if ((ct_len % 4) > 0) j++;
u32 tmp_buf[784] = { 0 };
u32 tmp_buf[784] = { 0 }; // TODO this can be smaller and would speedup the attack, only 64 bytes of ciphertext are allowed
for (u32 i = 0; i < j; i++) tmp_buf[i] = byte_swap_32 (metamask->ct_buf[i]);