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Adding to OpenSSL entropy pool when performing kdf

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This commit is contained in:
Nick Parker
2013-06-06 11:18:45 -05:00
parent 7026edb969
commit fcc1332c54
1 changed files with 9 additions and 2 deletions
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src/crypto_openssl.c
+9 -2
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@@ -39,6 +39,9 @@ static int sqlcipher_openssl_activate(void *ctx) {
if(openssl_external_init == 0) {
if(openssl_init_count == 0) {
OpenSSL_add_all_algorithms();
if(sqlcipher_openssl_add_random(ctx, &ctx, sizeof(openssl_ctx *)) != SQLITE_OK) {
return SQLITE_ERROR;
}
}
openssl_init_count++;
}
@@ -83,12 +86,16 @@ static int sqlcipher_openssl_hmac(void *ctx, unsigned char *hmac_key, int key_sz
HMAC_Update(&hctx, in2, in2_sz);
HMAC_Final(&hctx, out, &outlen);
HMAC_CTX_cleanup(&hctx);
sqlcipher_openssl_add_random(ctx, out, outlen);
return SQLITE_OK;
}
static int sqlcipher_openssl_kdf(void *ctx, const unsigned char *pass, int pass_sz, unsigned char* salt, int salt_sz, int workfactor, int key_sz, unsigned char *key) {
PKCS5_PBKDF2_HMAC_SHA1(pass, pass_sz, salt, salt_sz, workfactor, key_sz, key);
unsigned long random_buffer_sz = 256;
char random_buffer[random_buffer_sz];
PKCS5_PBKDF2_HMAC_SHA1(pass, pass_sz, salt, salt_sz, workfactor, key_sz, key);
PKCS5_PBKDF2_HMAC_SHA1(key, key_sz, salt, salt_sz, 1, random_buffer_sz, random_buffer);
sqlcipher_openssl_add_random(ctx, random_buffer, random_buffer_sz);
return SQLITE_OK;
}