318 lines
8.4 KiB
C
318 lines
8.4 KiB
C
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// Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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#include <assert.h>
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#include <openssl/digest.h>
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#include <openssl/err.h>
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#include "../../internal.h"
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#include "../evp/internal.h"
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#include "internal.h"
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void EVP_MD_unstable_sha3_enable(bool enable) { // no-op
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}
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bool EVP_MD_unstable_sha3_is_enabled(void) { return true; }
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int EVP_MD_type(const EVP_MD *md) { return md->type; }
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int EVP_MD_nid(const EVP_MD *md) { return EVP_MD_type(md); }
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uint32_t EVP_MD_flags(const EVP_MD *md) { return md->flags; }
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size_t EVP_MD_size(const EVP_MD *md) { return md->md_size; }
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size_t EVP_MD_block_size(const EVP_MD *md) { return md->block_size; }
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void EVP_MD_CTX_init(EVP_MD_CTX *ctx) {
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OPENSSL_memset(ctx, 0, sizeof(EVP_MD_CTX));
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}
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EVP_MD_CTX *EVP_MD_CTX_new(void) {
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EVP_MD_CTX *ctx = OPENSSL_zalloc(sizeof(EVP_MD_CTX));
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if (ctx) {
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// NO-OP: struct already zeroed
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//EVP_MD_CTX_init(ctx);
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}
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return ctx;
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}
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EVP_MD_CTX *EVP_MD_CTX_create(void) { return EVP_MD_CTX_new(); }
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int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) {
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if (ctx == NULL) {
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return 1;
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}
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OPENSSL_free(ctx->md_data);
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assert(ctx->pctx == NULL || ctx->pctx_ops != NULL);
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// |pctx| should be freed by the user of |EVP_MD_CTX| if
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// |EVP_MD_CTX_FLAG_KEEP_PKEY_CTX| is set. Everything other than the external |pctx| that |ctx->pctx| was pointing to is cleaned up when the flag is set.
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if (ctx->pctx_ops && !(ctx->flags & EVP_MD_CTX_FLAG_KEEP_PKEY_CTX)) {
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ctx->pctx_ops->free(ctx->pctx);
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}
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EVP_MD_CTX_init(ctx);
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return 1;
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}
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void EVP_MD_CTX_cleanse(EVP_MD_CTX *ctx) {
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if (ctx == NULL || ctx->md_data == NULL || ctx->digest == NULL) {
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return;
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}
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OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
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EVP_MD_CTX_cleanup(ctx);
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}
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void EVP_MD_CTX_free(EVP_MD_CTX *ctx) {
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if (!ctx) {
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return;
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}
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EVP_MD_CTX_cleanup(ctx);
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OPENSSL_free(ctx);
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}
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void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) { EVP_MD_CTX_free(ctx); }
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// EVP_DigestFinalXOF is a single-call XOF output generation function.
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// The |ctx->digest| check prevents calling EVP_DigestFinalXOF consecutively.
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// To catch single-call XOF EVP_DigestFinalXOF calls after |EVP_DigestSqueeze|,
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// the return |SHAKE_Final| value is used (the check is internally performed via
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// the |KECCAK1600_CTX *ctx| state flag).
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int EVP_DigestFinalXOF(EVP_MD_CTX *ctx, uint8_t *out, size_t len) {
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if (ctx->digest == NULL) {
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return 0;
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}
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if ((EVP_MD_flags(ctx->digest) & EVP_MD_FLAG_XOF) == 0) {
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OPENSSL_PUT_ERROR(DIGEST, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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return 0;
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}
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int ok = ctx->digest->finalXOF(ctx, out, len);
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EVP_MD_CTX_cleanse(ctx);
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return ok;
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}
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// EVP_DigestSqueeze is a streaming XOF output squeeze function
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// It can be called multiple times to generate an output of length
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// |len| bytes.
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int EVP_DigestSqueeze(EVP_MD_CTX *ctx, uint8_t *out, size_t len) {
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if (ctx->digest == NULL) {
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return 0;
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}
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if ((EVP_MD_flags(ctx->digest) & EVP_MD_FLAG_XOF) == 0) {
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OPENSSL_PUT_ERROR(DIGEST, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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return 0;
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}
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ctx->digest->squeezeXOF(ctx, out, len);
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return 1;
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}
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uint32_t EVP_MD_meth_get_flags(const EVP_MD *md) { return EVP_MD_flags(md); }
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void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, int flags) {}
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int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) {
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// |in->digest| may be NULL if this is a signing |EVP_MD_CTX| for, e.g.,
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// Ed25519 which does not hash with |EVP_MD_CTX|.
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if (in == NULL || (in->pctx == NULL && in->digest == NULL)) {
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OPENSSL_PUT_ERROR(DIGEST, DIGEST_R_INPUT_NOT_INITIALIZED);
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return 0;
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}
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EVP_PKEY_CTX *pctx = NULL;
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assert(in->pctx == NULL || in->pctx_ops != NULL);
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if (in->pctx) {
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pctx = in->pctx_ops->dup(in->pctx);
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if (!pctx) {
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return 0;
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}
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}
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uint8_t *tmp_buf = NULL;
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if (in->digest != NULL) {
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if (out->digest != in->digest) {
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assert(in->digest->ctx_size != 0);
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tmp_buf = OPENSSL_malloc(in->digest->ctx_size);
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if (tmp_buf == NULL) {
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if (pctx) {
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in->pctx_ops->free(pctx);
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}
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return 0;
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}
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} else {
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// |md_data| will be the correct size in this case. It's removed from
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// |out| so that |EVP_MD_CTX_cleanup| doesn't free it, and then it's
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// reused.
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tmp_buf = out->md_data;
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out->md_data = NULL;
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}
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}
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EVP_MD_CTX_cleanup(out);
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out->digest = in->digest;
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out->md_data = tmp_buf;
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if (in->digest != NULL && in->md_data != NULL) {
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OPENSSL_memcpy(out->md_data, in->md_data, in->digest->ctx_size);
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}
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out->update = in->update;
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out->flags = in->flags;
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// copied |EVP_MD_CTX| should free its newly allocated |EVP_PKEY_CTX|.
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out->flags &= ~EVP_MD_CTX_FLAG_KEEP_PKEY_CTX;
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out->pctx = pctx;
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out->pctx_ops = in->pctx_ops;
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assert(out->pctx == NULL || out->pctx_ops != NULL);
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return 1;
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}
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void EVP_MD_CTX_move(EVP_MD_CTX *out, EVP_MD_CTX *in) {
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EVP_MD_CTX_cleanup(out);
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// While not guaranteed, |EVP_MD_CTX| is currently safe to move with |memcpy|.
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OPENSSL_memcpy(out, in, sizeof(EVP_MD_CTX));
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EVP_MD_CTX_init(in);
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}
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int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) {
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EVP_MD_CTX_init(out);
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return EVP_MD_CTX_copy_ex(out, in);
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}
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int EVP_MD_CTX_reset(EVP_MD_CTX *ctx) {
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EVP_MD_CTX_cleanup(ctx);
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EVP_MD_CTX_init(ctx);
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return 1;
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}
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int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *engine) {
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if (ctx->digest != type) {
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ctx->digest = type;
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if (!used_for_hmac(ctx)) {
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assert(type->ctx_size != 0);
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ctx->update = type->update;
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uint8_t *md_data = OPENSSL_malloc(type->ctx_size);
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if (md_data == NULL) {
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return 0;
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}
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OPENSSL_free(ctx->md_data);
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ctx->md_data = md_data;
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}
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}
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assert(ctx->pctx == NULL || ctx->pctx_ops != NULL);
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if (used_for_hmac(ctx)) {
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// These configurations are specific to |EVP_PKEY_HMAC|. |HMAC_PKEY_CTX| is
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// newly allocated by |EVP_DigestSignInit| at this point. The actual key
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// data is stored in |ctx->pkey| as |HMAC_KEY|.
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if (ctx->pctx == NULL || ctx->pctx->data == NULL ||
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ctx->pctx->pkey == NULL || ctx->pctx->pkey->pkey.ptr == NULL) {
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return 0;
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}
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const HMAC_KEY *key = ctx->pctx->pkey->pkey.ptr;
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HMAC_PKEY_CTX *hmac_pctx = ctx->pctx->data;
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if (!HMAC_Init_ex(&hmac_pctx->ctx, key->key, key->key_len, hmac_pctx->md,
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ctx->pctx->engine)) {
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return 0;
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}
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return 1;
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}
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ctx->digest->init(ctx);
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return 1;
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}
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int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) {
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EVP_MD_CTX_init(ctx);
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return EVP_DigestInit_ex(ctx, type, NULL);
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}
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int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
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if (ctx->update == NULL) {
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return 0;
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}
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return ctx->update(ctx, data, len);
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}
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int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, uint8_t *md_out, unsigned int *size) {
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if (ctx->digest == NULL) {
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return 0;
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}
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if (EVP_MD_flags(ctx->digest) & EVP_MD_FLAG_XOF) {
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OPENSSL_PUT_ERROR(DIGEST, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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return 0;
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}
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assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
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ctx->digest->final(ctx, md_out);
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if (size != NULL) {
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*size = ctx->digest->md_size;
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}
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OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
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return 1;
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}
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int EVP_DigestFinal(EVP_MD_CTX *ctx, uint8_t *md, unsigned int *size) {
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int ok = EVP_DigestFinal_ex(ctx, md, size);
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EVP_MD_CTX_cleanup(ctx);
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return ok;
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}
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int EVP_Digest(const void *data, size_t count, uint8_t *out_md,
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unsigned int *out_size, const EVP_MD *type, ENGINE *impl) {
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EVP_MD_CTX ctx;
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int ret;
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if ((EVP_MD_flags(type) & EVP_MD_FLAG_XOF) && out_size == NULL) {
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OPENSSL_PUT_ERROR(DIGEST, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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EVP_MD_CTX_init(&ctx);
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ret = EVP_DigestInit_ex(&ctx, type, impl) &&
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EVP_DigestUpdate(&ctx, data, count);
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if (ret == 0) {
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EVP_MD_CTX_cleanup(&ctx);
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return 0;
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}
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if (EVP_MD_flags(type) & EVP_MD_FLAG_XOF) {
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ret &= EVP_DigestFinalXOF(&ctx, out_md, *out_size);
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} else {
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ret &= EVP_DigestFinal(&ctx, out_md, out_size);
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}
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return ret;
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}
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const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx) {
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if (ctx == NULL) {
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return NULL;
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}
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return ctx->digest;
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}
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size_t EVP_MD_CTX_size(const EVP_MD_CTX *ctx) {
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return EVP_MD_size(EVP_MD_CTX_md(ctx));
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}
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size_t EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx) {
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return EVP_MD_block_size(EVP_MD_CTX_md(ctx));
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}
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int EVP_MD_CTX_type(const EVP_MD_CTX *ctx) {
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return EVP_MD_type(EVP_MD_CTX_md(ctx));
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}
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int EVP_add_digest(const EVP_MD *digest) { return 1; }
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