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/*
* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "cipher_aes.h"
#include "internal/providercommonerr.h"
#include "internal/provider_algs.h"
/* AES wrap with padding has IV length of 4, without padding 8 */
#define AES_WRAP_PAD_IVLEN 4
#define AES_WRAP_NOPAD_IVLEN 8
/* TODO(3.0) Figure out what flags need to be passed */
#define WRAP_FLAGS (EVP_CIPH_WRAP_MODE \
| EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER \
| EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_FLAG_DEFAULT_ASN1)
typedef size_t (*aeswrap_fn)(void *key, const unsigned char *iv,
unsigned char *out, const unsigned char *in,
size_t inlen, block128_f block);
static OSSL_OP_cipher_encrypt_init_fn aes_wrap_einit;
static OSSL_OP_cipher_decrypt_init_fn aes_wrap_dinit;
static OSSL_OP_cipher_update_fn aes_wrap_cipher;
static OSSL_OP_cipher_final_fn aes_wrap_final;
static OSSL_OP_cipher_freectx_fn aes_wrap_freectx;
typedef struct prov_aes_wrap_ctx_st {
PROV_CIPHER_CTX base;
union {
OSSL_UNION_ALIGN;
AES_KEY ks;
} ks;
unsigned int iv_set : 1;
aeswrap_fn wrapfn;
} PROV_AES_WRAP_CTX;
static void *aes_wrap_newctx(size_t kbits, size_t blkbits,
size_t ivbits, unsigned int mode, uint64_t flags)
{
PROV_AES_WRAP_CTX *wctx = OPENSSL_zalloc(sizeof(*wctx));
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)wctx;
if (ctx != NULL) {
cipher_generic_initkey(ctx, kbits, blkbits, ivbits, mode, flags,
NULL, NULL);
ctx->pad = (ctx->ivlen == AES_WRAP_PAD_IVLEN);
}
return wctx;
}
static void aes_wrap_freectx(void *vctx)
{
PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
OPENSSL_cleanse(ctx->iv, sizeof(ctx->iv));
OPENSSL_clear_free(wctx, sizeof(*wctx));
}
static int aes_wrap_init(void *vctx, const unsigned char *key,
size_t keylen, const unsigned char *iv,
size_t ivlen, int enc)
{
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
ctx->enc = enc;
ctx->block = enc ? (block128_f)AES_encrypt : (block128_f)AES_decrypt;
if (ctx->pad)
wctx->wrapfn = enc ? CRYPTO_128_wrap_pad : CRYPTO_128_unwrap_pad;
else
wctx->wrapfn = enc ? CRYPTO_128_wrap : CRYPTO_128_unwrap;
if (iv != NULL) {
ctx->ivlen = ivlen;
memcpy(ctx->iv, iv, ivlen);
wctx->iv_set = 1;
}
if (key != NULL) {
if (keylen != ctx->keylen) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
if (ctx->enc)
AES_set_encrypt_key(key, keylen * 8, &wctx->ks.ks);
else
AES_set_decrypt_key(key, keylen * 8, &wctx->ks.ks);
}
return 1;
}
static int aes_wrap_einit(void *ctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen)
{
return aes_wrap_init(ctx, key, keylen, iv, ivlen, 1);
}
static int aes_wrap_dinit(void *ctx, const unsigned char *key, size_t keylen,
const unsigned char *iv, size_t ivlen)
{
return aes_wrap_init(ctx, key, keylen, iv, ivlen, 0);
}
static int aes_wrap_cipher_internal(void *vctx, unsigned char *out,
const unsigned char *in, size_t inlen)
{
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
size_t rv;
int pad = ctx->pad;
/* No final operation so always return zero length */
if (in == NULL)
return 0;
/* Input length must always be non-zero */
if (inlen == 0)
return -1;
/* If decrypting need at least 16 bytes and multiple of 8 */
if (!ctx->enc && (inlen < 16 || inlen & 0x7))
return -1;
/* If not padding input must be multiple of 8 */
if (!pad && inlen & 0x7)
return -1;
if (out == NULL) {
if (ctx->enc) {
/* If padding round up to multiple of 8 */
if (pad)
inlen = (inlen + 7) / 8 * 8;
/* 8 byte prefix */
return inlen + 8;
} else {
/*
* If not padding output will be exactly 8 bytes smaller than
* input. If padding it will be at least 8 bytes smaller but we
* don't know how much.
*/
return inlen - 8;
}
}
rv = wctx->wrapfn(&wctx->ks.ks, wctx->iv_set ? ctx->iv : NULL, out, in,
inlen, ctx->block);
return rv ? (int)rv : -1;
}
static int aes_wrap_final(void *vctx, unsigned char *out, size_t *outl,
size_t outsize)
{
*outl = 0;
return 1;
}
static int aes_wrap_cipher(void *vctx,
unsigned char *out, size_t *outl, size_t outsize,
const unsigned char *in, size_t inl)
{
PROV_AES_WRAP_CTX *ctx = (PROV_AES_WRAP_CTX *)vctx;
size_t len;
if (outsize < inl) {
ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
return -1;
}
len = aes_wrap_cipher_internal(ctx, out, in, inl);
if (len == 0)
return -1;
*outl = len;
return 1;
}
static int aes_wrap_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
const OSSL_PARAM *p;
size_t keylen = 0;
p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
if (p != NULL) {
if (!OSSL_PARAM_get_size_t(p, &keylen)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
return 0;
}
if (ctx->keylen != keylen) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
}
return 1;
}
#define IMPLEMENT_cipher(mode, fname, UCMODE, flags, kbits, blkbits, ivbits) \
static OSSL_OP_cipher_get_params_fn aes_##kbits##_##fname##_get_params; \
static int aes_##kbits##_##fname##_get_params(OSSL_PARAM params[]) \
{ \
return cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, \
flags, kbits, blkbits, ivbits); \
} \
static OSSL_OP_cipher_newctx_fn aes_##kbits##fname##_newctx; \
static void *aes_##kbits##fname##_newctx(void *provctx) \
{ \
return aes_##mode##_newctx(kbits, blkbits, ivbits, \
EVP_CIPH_##UCMODE##_MODE, flags); \
} \
const OSSL_DISPATCH aes##kbits##fname##_functions[] = { \
{ OSSL_FUNC_CIPHER_NEWCTX, \
(void (*)(void))aes_##kbits##fname##_newctx }, \
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_##mode##_einit }, \
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_##mode##_dinit }, \
{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_##mode##_cipher }, \
{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_##mode##_final }, \
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_##mode##_freectx }, \
{ OSSL_FUNC_CIPHER_GET_PARAMS, \
(void (*)(void))aes_##kbits##_##fname##_get_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
(void (*)(void))cipher_generic_gettable_params }, \
{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
(void (*)(void))cipher_generic_get_ctx_params }, \
{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
(void (*)(void))aes_wrap_set_ctx_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
(void (*)(void))cipher_generic_gettable_ctx_params }, \
{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
(void (*)(void))cipher_generic_settable_ctx_params }, \
{ 0, NULL } \
}
IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 256, 64, AES_WRAP_NOPAD_IVLEN * 8);
IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 192, 64, AES_WRAP_NOPAD_IVLEN * 8);
IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 128, 64, AES_WRAP_NOPAD_IVLEN * 8);
IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 256, 64, AES_WRAP_PAD_IVLEN * 8);
IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 192, 64, AES_WRAP_PAD_IVLEN * 8);
IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 128, 64, AES_WRAP_PAD_IVLEN * 8);
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