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sqlcipher
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allocate random data for intialization vector

This commit is contained in:
Stephen Lombardo 2008-08-09 08:46:03 -04:00
parent 301a6beeef
commit 984cc531df
1 changed files with 5 additions and 12 deletions
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17
src/crypto.c
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@ -89,9 +89,11 @@ static int codec_cipher(codec_ctx *ctx, Pgno pgno, int mode, int size, void *in,
size = size - ctx->iv_sz; /* adjust size to useable size and memset reserve at end of page */
iv = out + size;
if(mode == CIPHER_ENCRYPT) {
//RAND_pseudo_bytes(ctx->iv, ctx->iv_sz);
memset(iv, 0, ctx->iv_sz);
RAND_pseudo_bytes(iv, ctx->iv_sz);
} else {
memcpy(iv, in+size, ctx->iv_sz);
}
/* when this is an encryption operation and rekey is not null, we will actually encrypt
** data with the new rekey data */
@ -146,15 +148,6 @@ void* sqlite3Codec(void *iCtx, void *pData, Pgno pgno, int mode) {
break;
}
#if 0
if(pgno == 1 ) {
memcpy(ctx->buffer, pData, HDR_SZ);
/* adjust starting pointers in data page for header offset */
codec_cipher(ctx, pgno, emode, pg_sz - HDR_SZ, &pData[HDR_SZ], &ctx->buffer[HDR_SZ]);
} else {
codec_cipher(ctx, pgno, emode, pg_sz, pData, ctx->buffer);
}
#endif
codec_cipher(ctx, pgno, emode, pg_sz, pData, ctx->buffer);
if(emode == CIPHER_ENCRYPT) {
return ctx->buffer; /* return persistent buffer data, pData remains intact */
@ -188,7 +181,7 @@ int sqlite3CodecAttach(sqlite3* db, int nDb, const void *zKey, int nKey) {
ctx->key_sz = EVP_CIPHER_key_length(CIPHER);
ctx->iv_sz = EVP_CIPHER_key_length(CIPHER);
/* key size should be exactly the same size as nKey since this is
raw key data at this point */
assert(nKey == ctx->key_sz);