861b8f8747
Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/8700)
211 lines
5.8 KiB
C
211 lines
5.8 KiB
C
/*
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* Copyright 2019 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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#include <string.h>
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#include <openssl/crypto.h>
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#include <openssl/core_numbers.h>
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#include <openssl/core_names.h>
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#include <openssl/evp.h>
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#include <openssl/params.h>
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#include "internal/cryptlib.h"
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#include "internal/provider_algs.h"
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#include "ciphers_locl.h"
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static void PROV_AES_KEY_generic_init(PROV_AES_KEY *ctx,
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const unsigned char *iv,
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int enc)
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{
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if (iv != NULL)
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memcpy(ctx->iv, iv, AES_BLOCK_SIZE);
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ctx->enc = enc;
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}
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static int aes_einit(void *vctx, const unsigned char *key,
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const unsigned char *iv)
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{
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PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
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PROV_AES_KEY_generic_init(ctx, iv, 1);
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if (key != NULL)
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return ctx->ciph->init(ctx, key, ctx->keylen);
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return 1;
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}
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static int aes_dinit(void *vctx, const unsigned char *key,
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const unsigned char *iv)
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{
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PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
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PROV_AES_KEY_generic_init(ctx, iv, 0);
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if (key != NULL)
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return ctx->ciph->init(ctx, key, ctx->keylen);
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return 1;
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}
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static int aes_update(void *vctx, unsigned char *out, size_t *outl,
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const unsigned char *in, size_t inl)
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{
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PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
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size_t nextblocks = fillblock(ctx->buf, &ctx->bufsz, AES_BLOCK_SIZE, &in,
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&inl);
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size_t outlint = 0;
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/*
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* If we're decrypting and we end an update on a block boundary we hold
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* the last block back in case this is the last update call and the last
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* block is padded.
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*/
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if (ctx->bufsz == AES_BLOCK_SIZE
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&& (ctx->enc || inl > 0 || !ctx->pad)) {
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if (!ctx->ciph->cipher(ctx, out, ctx->buf, AES_BLOCK_SIZE))
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return 0;
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ctx->bufsz = 0;
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outlint = AES_BLOCK_SIZE;
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out += AES_BLOCK_SIZE;
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}
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if (nextblocks > 0) {
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if (!ctx->enc && ctx->pad && nextblocks == inl) {
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if (!ossl_assert(inl >= AES_BLOCK_SIZE))
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return 0;
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nextblocks -= AES_BLOCK_SIZE;
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}
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if (!ctx->ciph->cipher(ctx, out, in, nextblocks))
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return 0;
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in += nextblocks;
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inl -= nextblocks;
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outlint += nextblocks;
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}
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if (!trailingdata(ctx->buf, &ctx->bufsz, AES_BLOCK_SIZE, &in, &inl))
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return 0;
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*outl = outlint;
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return inl == 0;
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}
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static int aes_final(void *vctx, unsigned char *out, size_t *outl)
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{
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PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
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if (ctx->enc) {
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if (ctx->pad) {
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padblock(ctx->buf, &ctx->bufsz, AES_BLOCK_SIZE);
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} else if (ctx->bufsz == 0) {
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*outl = 0;
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return 1;
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} else if (ctx->bufsz != AES_BLOCK_SIZE) {
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/* TODO(3.0): What is the correct error code here? */
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return 0;
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}
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if (!ctx->ciph->cipher(ctx, out, ctx->buf, AES_BLOCK_SIZE))
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return 0;
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ctx->bufsz = 0;
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*outl = AES_BLOCK_SIZE;
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return 1;
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}
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/* Decrypting */
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/* TODO(3.0): What's the correct error here */
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if (ctx->bufsz != AES_BLOCK_SIZE) {
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if (ctx->bufsz == 0 && !ctx->pad) {
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*outl = 0;
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return 1;
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}
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return 0;
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}
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if (!ctx->ciph->cipher(ctx, ctx->buf, ctx->buf, AES_BLOCK_SIZE))
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return 0;
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/* TODO(3.0): What is the correct error here */
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if (ctx->pad && !unpadblock(ctx->buf, &ctx->bufsz, AES_BLOCK_SIZE))
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return 0;
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memcpy(out, ctx->buf, ctx->bufsz);
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*outl = ctx->bufsz;
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ctx->bufsz = 0;
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return 1;
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}
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static void *aes_256_ecb_newctx(void)
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{
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PROV_AES_KEY *ctx = OPENSSL_zalloc(sizeof(*ctx));
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ctx->pad = 1;
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ctx->keylen = 256 / 8;
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ctx->ciph = PROV_AES_CIPHER_ecb();
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ctx->mode = EVP_CIPH_ECB_MODE;
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return ctx;
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}
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static void aes_freectx(void *vctx)
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{
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PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
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OPENSSL_clear_free(ctx, sizeof(*ctx));
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}
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static void *aes_dupctx(void *ctx)
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{
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PROV_AES_KEY *in = (PROV_AES_KEY *)ctx;
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PROV_AES_KEY *ret = OPENSSL_malloc(sizeof(*ret));
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*ret = *in;
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return ret;
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}
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static size_t key_length_256(void)
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{
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return 256 / 8;
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}
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static int aes_get_params(void *vctx, const OSSL_PARAM params[])
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{
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PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
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const OSSL_PARAM *p;
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_PADDING);
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if (p != NULL && !OSSL_PARAM_set_uint(p, ctx->pad))
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return 0;
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return 1;
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}
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static int aes_set_params(void *vctx, const OSSL_PARAM params[])
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{
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PROV_AES_KEY *ctx = (PROV_AES_KEY *)vctx;
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const OSSL_PARAM *p;
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p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_PADDING);
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if (p != NULL) {
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int pad;
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if (!OSSL_PARAM_get_int(p, &pad))
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return 0;
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ctx->pad = pad ? 1 : 0;
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}
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return 1;
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}
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const OSSL_DISPATCH aes256ecb_functions[] = {
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{ OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))aes_256_ecb_newctx },
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{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_einit },
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{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_dinit },
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{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_update },
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{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_final },
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{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_freectx },
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{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))aes_dupctx },
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{ OSSL_FUNC_CIPHER_KEY_LENGTH, (void (*)(void))key_length_256 },
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{ OSSL_FUNC_CIPHER_GET_PARAMS, (void (*)(void))aes_get_params },
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{ OSSL_FUNC_CIPHER_SET_PARAMS, (void (*)(void))aes_set_params },
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{ 0, NULL }
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};
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