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Bitlk: Move crypt key handling to crypto backend.

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This commit is contained in:
Milan Broz
2019-11-07 11:54:44 +01:00
parent bc87140b5b
commit 79019b1ced
7 changed files with 99 additions and 27 deletions
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39
lib/crypto_backend/crypto_openssl.c
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@@ -35,6 +35,8 @@
#include <openssl/rand.h>
#include "crypto_backend_internal.h"
#define CONST_CAST(x) (x)(uintptr_t)
static int crypto_backend_initialised = 0;
struct crypt_hash {
@@ -505,3 +507,40 @@ bool crypt_cipher_kernel_only(struct crypt_cipher *ctx)
{
return ctx->use_kernel;
}
int crypt_bitlk_decrypt_key(const void *key, size_t key_length,
const char *in, char *out, size_t length,
const char *iv, size_t iv_length,
const char *tag, size_t tag_length)
{
#ifdef EVP_CTRL_CCM_SET_IVLEN
EVP_CIPHER_CTX *ctx;
int len = 0, r = -EINVAL;
ctx = EVP_CIPHER_CTX_new();
if (!ctx)
return -EINVAL;
if (EVP_DecryptInit_ex(ctx, EVP_aes_256_ccm(), NULL, NULL, NULL) != 1)
goto out;
//EVP_CIPHER_CTX_key_length(ctx)
//EVP_CIPHER_CTX_iv_length(ctx)
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_IVLEN, iv_length, NULL) != 1)
goto out;
if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_TAG, tag_length, CONST_CAST(void*)tag) != 1)
goto out;
if (EVP_DecryptInit_ex(ctx, NULL, NULL, key, (const unsigned char*)iv) != 1)
goto out;
if (EVP_DecryptUpdate(ctx, (unsigned char*)out, &len, (const unsigned char*)in, length) == 1)
r = 0;
out:
EVP_CIPHER_CTX_free(ctx);
return r;
#else
return -ENOTSUP;
#endif
}