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keystore: compute the padding in an intuitive way.

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This commit is contained in:
Chia-chi Yeh
2009-12-30 10:38:39 +08:00
parent 121ec7ff33
commit 5fe8598f75
1 changed files with 3 additions and 7 deletions
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10
cmds/keystore/keystore.c
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@@ -170,16 +170,12 @@ static int8_t encrypt_blob(char *name, AES_KEY *aes_key)
return SYSTEM_ERROR;
}
length = (blob.length + blob.value - blob.encrypted) % AES_BLOCK_SIZE;
if (length) {
length = AES_BLOCK_SIZE - length;
}
length = blob.length + blob.value - blob.encrypted;
length = (length + AES_BLOCK_SIZE - 1) / AES_BLOCK_SIZE * AES_BLOCK_SIZE;
length += blob.length + blob.value - blob.digested;
blob.length = htonl(blob.length);
MD5(blob.digested, length, blob.digest);
MD5(blob.digested, length - (blob.digested - blob.encrypted), blob.digest);
length += blob.digested - blob.encrypted;
memcpy(vector, blob.vector, AES_BLOCK_SIZE);
AES_cbc_encrypt(blob.encrypted, blob.encrypted, length, aes_key, vector,
AES_ENCRYPT);