561 lines
20 KiB
C
561 lines
20 KiB
C
/*
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* Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* AES low level APIs are deprecated for public use, but still ok for internal
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* use where we're using them to implement the higher level EVP interface, as is
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* the case here.
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*/
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#include "internal/deprecated.h"
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#include <openssl/proverr.h>
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#include "cipher_aes_ocb.h"
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#include "prov/providercommon.h"
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#include "prov/ciphercommon_aead.h"
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#include "prov/implementations.h"
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#define AES_OCB_FLAGS AEAD_FLAGS
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#define OCB_DEFAULT_TAG_LEN 16
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#define OCB_DEFAULT_IV_LEN 12
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#define OCB_MIN_IV_LEN 1
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#define OCB_MAX_IV_LEN 15
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PROV_CIPHER_FUNC(int, ocb_cipher, (PROV_AES_OCB_CTX *ctx,
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const unsigned char *in, unsigned char *out,
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size_t nextblock));
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/* forward declarations */
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static OSSL_FUNC_cipher_encrypt_init_fn aes_ocb_einit;
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static OSSL_FUNC_cipher_decrypt_init_fn aes_ocb_dinit;
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static OSSL_FUNC_cipher_update_fn aes_ocb_block_update;
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static OSSL_FUNC_cipher_final_fn aes_ocb_block_final;
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static OSSL_FUNC_cipher_cipher_fn aes_ocb_cipher;
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static OSSL_FUNC_cipher_freectx_fn aes_ocb_freectx;
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static OSSL_FUNC_cipher_dupctx_fn aes_ocb_dupctx;
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static OSSL_FUNC_cipher_get_ctx_params_fn aes_ocb_get_ctx_params;
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static OSSL_FUNC_cipher_set_ctx_params_fn aes_ocb_set_ctx_params;
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static OSSL_FUNC_cipher_gettable_ctx_params_fn cipher_ocb_gettable_ctx_params;
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static OSSL_FUNC_cipher_settable_ctx_params_fn cipher_ocb_settable_ctx_params;
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/*
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* The following methods could be moved into PROV_AES_OCB_HW if
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* multiple hardware implementations are ever needed.
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*/
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static ossl_inline int aes_generic_ocb_setiv(PROV_AES_OCB_CTX *ctx,
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const unsigned char *iv,
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size_t ivlen, size_t taglen)
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{
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return (CRYPTO_ocb128_setiv(&ctx->ocb, iv, ivlen, taglen) == 1);
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}
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static ossl_inline int aes_generic_ocb_setaad(PROV_AES_OCB_CTX *ctx,
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const unsigned char *aad,
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size_t alen)
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{
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return CRYPTO_ocb128_aad(&ctx->ocb, aad, alen) == 1;
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}
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static ossl_inline int aes_generic_ocb_gettag(PROV_AES_OCB_CTX *ctx,
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unsigned char *tag, size_t tlen)
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{
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return CRYPTO_ocb128_tag(&ctx->ocb, tag, tlen) > 0;
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}
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static ossl_inline int aes_generic_ocb_final(PROV_AES_OCB_CTX *ctx)
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{
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return (CRYPTO_ocb128_finish(&ctx->ocb, ctx->tag, ctx->taglen) == 0);
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}
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static ossl_inline void aes_generic_ocb_cleanup(PROV_AES_OCB_CTX *ctx)
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{
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CRYPTO_ocb128_cleanup(&ctx->ocb);
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}
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static ossl_inline int aes_generic_ocb_cipher(PROV_AES_OCB_CTX *ctx,
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const unsigned char *in,
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unsigned char *out, size_t len)
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{
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if (ctx->base.enc) {
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if (!CRYPTO_ocb128_encrypt(&ctx->ocb, in, out, len))
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return 0;
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} else {
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if (!CRYPTO_ocb128_decrypt(&ctx->ocb, in, out, len))
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return 0;
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}
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return 1;
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}
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static ossl_inline int aes_generic_ocb_copy_ctx(PROV_AES_OCB_CTX *dst,
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PROV_AES_OCB_CTX *src)
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{
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return CRYPTO_ocb128_copy_ctx(&dst->ocb, &src->ocb,
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&dst->ksenc.ks, &dst->ksdec.ks);
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}
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/*-
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* Provider dispatch functions
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*/
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static int aes_ocb_init(void *vctx, const unsigned char *key, size_t keylen,
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const unsigned char *iv, size_t ivlen,
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const OSSL_PARAM params[], int enc)
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{
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PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
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if (!ossl_prov_is_running())
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return 0;
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ctx->aad_buf_len = 0;
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ctx->data_buf_len = 0;
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ctx->base.enc = enc;
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if (iv != NULL) {
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if (ivlen != ctx->base.ivlen) {
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/* IV len must be 1 to 15 */
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if (ivlen < OCB_MIN_IV_LEN || ivlen > OCB_MAX_IV_LEN) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
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return 0;
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}
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ctx->base.ivlen = ivlen;
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}
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if (!ossl_cipher_generic_initiv(&ctx->base, iv, ivlen))
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return 0;
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ctx->iv_state = IV_STATE_BUFFERED;
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}
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if (key != NULL) {
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if (keylen != ctx->base.keylen) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
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return 0;
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}
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if (!ctx->base.hw->init(&ctx->base, key, keylen))
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return 0;
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}
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return aes_ocb_set_ctx_params(ctx, params);
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}
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static int aes_ocb_einit(void *vctx, const unsigned char *key, size_t keylen,
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const unsigned char *iv, size_t ivlen,
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const OSSL_PARAM params[])
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{
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return aes_ocb_init(vctx, key, keylen, iv, ivlen, params, 1);
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}
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static int aes_ocb_dinit(void *vctx, const unsigned char *key, size_t keylen,
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const unsigned char *iv, size_t ivlen,
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const OSSL_PARAM params[])
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{
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return aes_ocb_init(vctx, key, keylen, iv, ivlen, params, 0);
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}
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/*
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* Because of the way OCB works, both the AAD and data are buffered in the
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* same way. Only the last block can be a partial block.
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*/
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static int aes_ocb_block_update_internal(PROV_AES_OCB_CTX *ctx,
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unsigned char *buf, size_t *bufsz,
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unsigned char *out, size_t *outl,
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size_t outsize, const unsigned char *in,
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size_t inl, OSSL_ocb_cipher_fn ciph)
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{
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size_t nextblocks;
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size_t outlint = 0;
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if (*bufsz != 0)
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nextblocks = ossl_cipher_fillblock(buf, bufsz, AES_BLOCK_SIZE, &in, &inl);
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else
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nextblocks = inl & ~(AES_BLOCK_SIZE-1);
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if (*bufsz == AES_BLOCK_SIZE) {
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if (outsize < AES_BLOCK_SIZE) {
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ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
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return 0;
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}
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if (!ciph(ctx, buf, out, AES_BLOCK_SIZE)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
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return 0;
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}
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*bufsz = 0;
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outlint = AES_BLOCK_SIZE;
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if (out != NULL)
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out += AES_BLOCK_SIZE;
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}
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if (nextblocks > 0) {
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outlint += nextblocks;
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if (outsize < outlint) {
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ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
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return 0;
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}
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if (!ciph(ctx, in, out, nextblocks)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
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return 0;
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}
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in += nextblocks;
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inl -= nextblocks;
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}
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if (inl != 0
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&& !ossl_cipher_trailingdata(buf, bufsz, AES_BLOCK_SIZE, &in, &inl)) {
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/* PROVerr already called */
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return 0;
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}
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*outl = outlint;
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return inl == 0;
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}
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/* A wrapper function that has the same signature as cipher */
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static int cipher_updateaad(PROV_AES_OCB_CTX *ctx, const unsigned char *in,
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unsigned char *out, size_t len)
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{
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return aes_generic_ocb_setaad(ctx, in, len);
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}
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static int update_iv(PROV_AES_OCB_CTX *ctx)
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{
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if (ctx->iv_state == IV_STATE_FINISHED
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|| ctx->iv_state == IV_STATE_UNINITIALISED)
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return 0;
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if (ctx->iv_state == IV_STATE_BUFFERED) {
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if (!aes_generic_ocb_setiv(ctx, ctx->base.iv, ctx->base.ivlen,
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ctx->taglen))
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return 0;
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ctx->iv_state = IV_STATE_COPIED;
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}
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return 1;
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}
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static int aes_ocb_block_update(void *vctx, unsigned char *out, size_t *outl,
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size_t outsize, const unsigned char *in,
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size_t inl)
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{
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PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
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unsigned char *buf;
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size_t *buflen;
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OSSL_ocb_cipher_fn fn;
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if (!ctx->key_set || !update_iv(ctx))
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return 0;
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if (inl == 0) {
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*outl = 0;
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return 1;
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}
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/* Are we dealing with AAD or normal data here? */
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if (out == NULL) {
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buf = ctx->aad_buf;
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buflen = &ctx->aad_buf_len;
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fn = cipher_updateaad;
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} else {
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buf = ctx->data_buf;
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buflen = &ctx->data_buf_len;
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fn = aes_generic_ocb_cipher;
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}
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return aes_ocb_block_update_internal(ctx, buf, buflen, out, outl, outsize,
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in, inl, fn);
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}
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static int aes_ocb_block_final(void *vctx, unsigned char *out, size_t *outl,
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size_t outsize)
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{
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PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
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if (!ossl_prov_is_running())
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return 0;
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/* If no block_update has run then the iv still needs to be set */
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if (!ctx->key_set || !update_iv(ctx))
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return 0;
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/*
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* Empty the buffer of any partial block that we might have been provided,
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* both for data and AAD
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*/
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*outl = 0;
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if (ctx->data_buf_len > 0) {
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if (!aes_generic_ocb_cipher(ctx, ctx->data_buf, out, ctx->data_buf_len))
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return 0;
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*outl = ctx->data_buf_len;
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ctx->data_buf_len = 0;
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}
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if (ctx->aad_buf_len > 0) {
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if (!aes_generic_ocb_setaad(ctx, ctx->aad_buf, ctx->aad_buf_len))
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return 0;
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ctx->aad_buf_len = 0;
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}
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if (ctx->base.enc) {
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/* If encrypting then just get the tag */
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if (!aes_generic_ocb_gettag(ctx, ctx->tag, ctx->taglen))
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return 0;
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} else {
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/* If decrypting then verify */
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if (ctx->taglen == 0)
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return 0;
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if (!aes_generic_ocb_final(ctx))
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return 0;
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}
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/* Don't reuse the IV */
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ctx->iv_state = IV_STATE_FINISHED;
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return 1;
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}
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static void *aes_ocb_newctx(void *provctx, size_t kbits, size_t blkbits,
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size_t ivbits, unsigned int mode, uint64_t flags)
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{
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PROV_AES_OCB_CTX *ctx;
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if (!ossl_prov_is_running())
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return NULL;
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ctx = OPENSSL_zalloc(sizeof(*ctx));
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if (ctx != NULL) {
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ossl_cipher_generic_initkey(ctx, kbits, blkbits, ivbits, mode, flags,
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ossl_prov_cipher_hw_aes_ocb(kbits), NULL);
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ctx->taglen = OCB_DEFAULT_TAG_LEN;
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}
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return ctx;
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}
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static void aes_ocb_freectx(void *vctx)
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{
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PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
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if (ctx != NULL) {
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aes_generic_ocb_cleanup(ctx);
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ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
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OPENSSL_clear_free(ctx, sizeof(*ctx));
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}
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}
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static void *aes_ocb_dupctx(void *vctx)
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{
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PROV_AES_OCB_CTX *in = (PROV_AES_OCB_CTX *)vctx;
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PROV_AES_OCB_CTX *ret;
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if (!ossl_prov_is_running())
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return NULL;
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ret = OPENSSL_malloc(sizeof(*ret));
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if (ret == NULL)
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return NULL;
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*ret = *in;
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if (!aes_generic_ocb_copy_ctx(ret, in)) {
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OPENSSL_free(ret);
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ret = NULL;
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}
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return ret;
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}
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static int aes_ocb_set_ctx_params(void *vctx, const OSSL_PARAM params[])
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{
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PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
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const OSSL_PARAM *p;
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size_t sz;
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if (params == NULL)
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return 1;
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p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TAG);
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if (p != NULL) {
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if (p->data_type != OSSL_PARAM_OCTET_STRING) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
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if (p->data == NULL) {
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/* Tag len must be 0 to 16 */
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if (p->data_size > OCB_MAX_TAG_LEN)
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return 0;
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ctx->taglen = p->data_size;
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} else {
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if (p->data_size != ctx->taglen || ctx->base.enc)
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return 0;
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memcpy(ctx->tag, p->data, p->data_size);
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}
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}
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p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_IVLEN);
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if (p != NULL) {
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if (!OSSL_PARAM_get_size_t(p, &sz)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
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/* IV len must be 1 to 15 */
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if (sz < OCB_MIN_IV_LEN || sz > OCB_MAX_IV_LEN)
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return 0;
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if (ctx->base.ivlen != sz) {
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ctx->base.ivlen = sz;
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ctx->iv_state = IV_STATE_UNINITIALISED;
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}
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}
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p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
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if (p != NULL) {
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size_t keylen;
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if (!OSSL_PARAM_get_size_t(p, &keylen)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
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if (ctx->base.keylen != keylen) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
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return 0;
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}
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}
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return 1;
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}
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static int aes_ocb_get_ctx_params(void *vctx, OSSL_PARAM params[])
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{
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PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
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OSSL_PARAM *p;
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
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if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->base.ivlen)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
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if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->base.keylen)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAGLEN);
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if (p != NULL) {
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if (!OSSL_PARAM_set_size_t(p, ctx->taglen)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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}
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IV);
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if (p != NULL) {
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if (ctx->base.ivlen > p->data_size) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
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return 0;
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}
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if (!OSSL_PARAM_set_octet_string(p, ctx->base.oiv, ctx->base.ivlen)
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&& !OSSL_PARAM_set_octet_ptr(p, &ctx->base.oiv, ctx->base.ivlen)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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}
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_UPDATED_IV);
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if (p != NULL) {
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if (ctx->base.ivlen > p->data_size) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
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return 0;
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}
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if (!OSSL_PARAM_set_octet_string(p, ctx->base.iv, ctx->base.ivlen)
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&& !OSSL_PARAM_set_octet_ptr(p, &ctx->base.iv, ctx->base.ivlen)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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return 0;
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}
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}
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAG);
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if (p != NULL) {
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if (p->data_type != OSSL_PARAM_OCTET_STRING) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
|
|
if (!ctx->base.enc || p->data_size != ctx->taglen) {
|
|
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG_LENGTH);
|
|
return 0;
|
|
}
|
|
memcpy(p->data, ctx->tag, ctx->taglen);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static const OSSL_PARAM cipher_ocb_known_gettable_ctx_params[] = {
|
|
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
|
|
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL),
|
|
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_TAGLEN, NULL),
|
|
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_IV, NULL, 0),
|
|
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_UPDATED_IV, NULL, 0),
|
|
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG, NULL, 0),
|
|
OSSL_PARAM_END
|
|
};
|
|
static const OSSL_PARAM *cipher_ocb_gettable_ctx_params(ossl_unused void *cctx,
|
|
ossl_unused void *p_ctx)
|
|
{
|
|
return cipher_ocb_known_gettable_ctx_params;
|
|
}
|
|
|
|
static const OSSL_PARAM cipher_ocb_known_settable_ctx_params[] = {
|
|
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
|
|
OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_IVLEN, NULL),
|
|
OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG, NULL, 0),
|
|
OSSL_PARAM_END
|
|
};
|
|
static const OSSL_PARAM *cipher_ocb_settable_ctx_params(ossl_unused void *cctx,
|
|
ossl_unused void *p_ctx)
|
|
{
|
|
return cipher_ocb_known_settable_ctx_params;
|
|
}
|
|
|
|
static int aes_ocb_cipher(void *vctx, unsigned char *out, size_t *outl,
|
|
size_t outsize, const unsigned char *in, size_t inl)
|
|
{
|
|
PROV_AES_OCB_CTX *ctx = (PROV_AES_OCB_CTX *)vctx;
|
|
|
|
if (!ossl_prov_is_running())
|
|
return 0;
|
|
|
|
if (outsize < inl) {
|
|
ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
|
|
return 0;
|
|
}
|
|
|
|
if (!aes_generic_ocb_cipher(ctx, in, out, inl)) {
|
|
ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
|
|
return 0;
|
|
}
|
|
|
|
*outl = inl;
|
|
return 1;
|
|
}
|
|
|
|
#define IMPLEMENT_cipher(mode, UCMODE, flags, kbits, blkbits, ivbits) \
|
|
static OSSL_FUNC_cipher_get_params_fn aes_##kbits##_##mode##_get_params; \
|
|
static int aes_##kbits##_##mode##_get_params(OSSL_PARAM params[]) \
|
|
{ \
|
|
return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, \
|
|
flags, kbits, blkbits, ivbits); \
|
|
} \
|
|
static OSSL_FUNC_cipher_newctx_fn aes_##kbits##_##mode##_newctx; \
|
|
static void *aes_##kbits##_##mode##_newctx(void *provctx) \
|
|
{ \
|
|
return aes_##mode##_newctx(provctx, kbits, blkbits, ivbits, \
|
|
EVP_CIPH_##UCMODE##_MODE, flags); \
|
|
} \
|
|
const OSSL_DISPATCH ossl_##aes##kbits##mode##_functions[] = { \
|
|
{ OSSL_FUNC_CIPHER_NEWCTX, \
|
|
(void (*)(void))aes_##kbits##_##mode##_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##_block_update }, \
|
|
{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_##mode##_block_final }, \
|
|
{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))aes_ocb_cipher }, \
|
|
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_##mode##_freectx }, \
|
|
{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))aes_##mode##_dupctx }, \
|
|
{ OSSL_FUNC_CIPHER_GET_PARAMS, \
|
|
(void (*)(void))aes_##kbits##_##mode##_get_params }, \
|
|
{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
|
|
(void (*)(void))aes_##mode##_get_ctx_params }, \
|
|
{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
|
|
(void (*)(void))aes_##mode##_set_ctx_params }, \
|
|
{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
|
|
(void (*)(void))ossl_cipher_generic_gettable_params }, \
|
|
{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
|
|
(void (*)(void))cipher_ocb_gettable_ctx_params }, \
|
|
{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
|
|
(void (*)(void))cipher_ocb_settable_ctx_params }, \
|
|
OSSL_DISPATCH_END \
|
|
}
|
|
|
|
IMPLEMENT_cipher(ocb, OCB, AES_OCB_FLAGS, 256, 128, OCB_DEFAULT_IV_LEN * 8);
|
|
IMPLEMENT_cipher(ocb, OCB, AES_OCB_FLAGS, 192, 128, OCB_DEFAULT_IV_LEN * 8);
|
|
IMPLEMENT_cipher(ocb, OCB, AES_OCB_FLAGS, 128, 128, OCB_DEFAULT_IV_LEN * 8);
|