diff options
Diffstat (limited to 'source4/libcli/util/smbdes.c')
| -rw-r--r-- | source4/libcli/util/smbdes.c | 42 |
1 files changed, 30 insertions, 12 deletions
diff --git a/source4/libcli/util/smbdes.c b/source4/libcli/util/smbdes.c index 99c2c00977..a7c8f760ea 100644 --- a/source4/libcli/util/smbdes.c +++ b/source4/libcli/util/smbdes.c @@ -364,30 +364,36 @@ void des_crypt112_16(uint8_t out[16], uint8_t in[16], const uint8_t key[14], int des_crypt56(out + 8, in + 8, key+7, forw); } -/* - arcfour encryption with a blob key -*/ -void arcfour_crypt_blob(uint8_t *data, int len, const DATA_BLOB *key) +/* initialise the arcfour sbox with key */ +void arcfour_init(uint8_t s_box[256], const DATA_BLOB *key) { - uint8_t s_box[256]; - uint8_t index_i = 0; - uint8_t index_j = 0; - uint8_t j = 0; int ind; - + uint8_t j = 0; for (ind = 0; ind < 256; ind++) { s_box[ind] = (uint8_t)ind; } - + for (ind = 0; ind < 256; ind++) { uint8_t tc; - + j += (s_box[ind] + key->data[ind%key->length]); - + tc = s_box[ind]; s_box[ind] = s_box[j]; s_box[j] = tc; } + s_box[256] = 0; /* i */ + s_box[257] = 0; /* j */ + +} + +/* crypt the data with arcfour */ +void arcfour_crypt_sbox(uint8_t s_box[258], uint8_t *data, int len) +{ + uint8_t index_i = s_box[256]; + uint8_t index_j = s_box[257]; + int ind; + for (ind = 0; ind < len; ind++) { uint8_t tc; uint8_t t; @@ -402,6 +408,18 @@ void arcfour_crypt_blob(uint8_t *data, int len, const DATA_BLOB *key) t = s_box[index_i] + s_box[index_j]; data[ind] = data[ind] ^ s_box[t]; } + s_box[256] = index_i; + s_box[257] = index_j; +} + +/* + arcfour encryption with a blob key +*/ +void arcfour_crypt_blob(uint8_t *data, int len, const DATA_BLOB *key) +{ + uint8_t s_box[258]; + arcfour_init(s_box, key); + arcfour_crypt_sbox(s_box, data, len); } /* |