DeforaOS/Phone
DeforaOS/Phone
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Hashing the chained block to prevent attacks on constant content

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This commit is contained in:
Pierre Pronchery 2010-08-02 12:14:21 +00:00
parent 8590ced368
commit 2d867e875a
1 changed files with 14 additions and 2 deletions
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16
src/plugins/smscrypt.c
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@ -153,6 +153,7 @@ static int _smscrypt_event_sms_receiving(PhonePlugin * plugin,
SMSCrypt * smscrypt = plugin->priv; SMSCrypt * smscrypt = plugin->priv;
size_t i; size_t i;
size_t j = 0; size_t j = 0;
SHA_CTX sha1;
#ifdef DEBUG #ifdef DEBUG
fprintf(stderr, "DEBUG: %s(%u, buf, %lu)\n", __func__, *encoding, fprintf(stderr, "DEBUG: %s(%u, buf, %lu)\n", __func__, *encoding,
@ -166,7 +167,12 @@ static int _smscrypt_event_sms_receiving(PhonePlugin * plugin,
{ {
(*buf)[i] ^= smscrypt->buf[j]; (*buf)[i] ^= smscrypt->buf[j];
smscrypt->buf[j++] ^= (*buf)[i]; smscrypt->buf[j++] ^= (*buf)[i];
j %= smscrypt->len; if(j != smscrypt->len)
continue;
SHA1_Init(&sha1);
SHA1_Update(&sha1, smscrypt->buf, smscrypt->len);
SHA1_Final(smscrypt->buf, &sha1);
j = 0;
} }
*encoding = PHONE_ENCODING_UTF8; *encoding = PHONE_ENCODING_UTF8;
_smscrypt_clear(plugin); _smscrypt_clear(plugin);
@ -180,6 +186,7 @@ static int _smscrypt_event_sms_sending(PhonePlugin * plugin,
SMSCrypt * smscrypt = plugin->priv; SMSCrypt * smscrypt = plugin->priv;
size_t i; size_t i;
size_t j = 0; size_t j = 0;
SHA_CTX sha1;
#ifdef DEBUG #ifdef DEBUG
fprintf(stderr, "DEBUG: %s(\"%s\", %u, buf, %lu)\n", __func__, number, fprintf(stderr, "DEBUG: %s(\"%s\", %u, buf, %lu)\n", __func__, number,
@ -194,7 +201,12 @@ static int _smscrypt_event_sms_sending(PhonePlugin * plugin,
{ {
(*buf)[i] ^= smscrypt->buf[j]; (*buf)[i] ^= smscrypt->buf[j];
smscrypt->buf[j++] = (*buf)[i]; smscrypt->buf[j++] = (*buf)[i];
j %= smscrypt->len; if(j != smscrypt->len)
continue;
SHA1_Init(&sha1);
SHA1_Update(&sha1, smscrypt->buf, smscrypt->len);
SHA1_Final(smscrypt->buf, &sha1);
j = 0;
} }
*encoding = PHONE_ENCODING_DATA; *encoding = PHONE_ENCODING_DATA;
_smscrypt_clear(plugin); _smscrypt_clear(plugin);