diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/evp/digest.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/evp/digest.c | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/evp/digest.c b/openssl-1.1.0h/crypto/evp/digest.c new file mode 100644 index 0000000..65eff7c --- /dev/null +++ b/openssl-1.1.0h/crypto/evp/digest.c @@ -0,0 +1,269 @@ +/* + * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (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 <stdio.h> +#include "internal/cryptlib.h" +#include <openssl/objects.h> +#include <openssl/evp.h> +#include <openssl/engine.h> +#include "internal/evp_int.h" +#include "evp_locl.h" + +/* This call frees resources associated with the context */ +int EVP_MD_CTX_reset(EVP_MD_CTX *ctx) +{ + if (ctx == NULL) + return 1; + + /* + * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because + * sometimes only copies of the context are ever finalised. + */ + if (ctx->digest && ctx->digest->cleanup + && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED)) + ctx->digest->cleanup(ctx); + if (ctx->digest && ctx->digest->ctx_size && ctx->md_data + && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) { + OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size); + } + EVP_PKEY_CTX_free(ctx->pctx); +#ifndef OPENSSL_NO_ENGINE + ENGINE_finish(ctx->engine); +#endif + OPENSSL_cleanse(ctx, sizeof(*ctx)); + + return 1; +} + +EVP_MD_CTX *EVP_MD_CTX_new(void) +{ + return OPENSSL_zalloc(sizeof(EVP_MD_CTX)); +} + +void EVP_MD_CTX_free(EVP_MD_CTX *ctx) +{ + EVP_MD_CTX_reset(ctx); + OPENSSL_free(ctx); +} + +int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) +{ + EVP_MD_CTX_reset(ctx); + return EVP_DigestInit_ex(ctx, type, NULL); +} + +int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) +{ + EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); +#ifndef OPENSSL_NO_ENGINE + /* + * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so + * this context may already have an ENGINE! Try to avoid releasing the + * previous handle, re-querying for an ENGINE, and having a + * reinitialisation, when it may all be unnecessary. + */ + if (ctx->engine && ctx->digest && + (type == NULL || (type->type == ctx->digest->type))) + goto skip_to_init; + if (type) { + /* + * Ensure an ENGINE left lying around from last time is cleared (the + * previous check attempted to avoid this if the same ENGINE and + * EVP_MD could be used). + */ + ENGINE_finish(ctx->engine); + if (impl != NULL) { + if (!ENGINE_init(impl)) { + EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR); + return 0; + } + } else { + /* Ask if an ENGINE is reserved for this job */ + impl = ENGINE_get_digest_engine(type->type); + } + if (impl != NULL) { + /* There's an ENGINE for this job ... (apparently) */ + const EVP_MD *d = ENGINE_get_digest(impl, type->type); + + if (d == NULL) { + EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR); + ENGINE_finish(impl); + return 0; + } + /* We'll use the ENGINE's private digest definition */ + type = d; + /* + * Store the ENGINE functional reference so we know 'type' came + * from an ENGINE and we need to release it when done. + */ + ctx->engine = impl; + } else + ctx->engine = NULL; + } else { + if (!ctx->digest) { + EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET); + return 0; + } + type = ctx->digest; + } +#endif + if (ctx->digest != type) { + if (ctx->digest && ctx->digest->ctx_size) { + OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size); + ctx->md_data = NULL; + } + ctx->digest = type; + if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { + ctx->update = type->update; + ctx->md_data = OPENSSL_zalloc(type->ctx_size); + if (ctx->md_data == NULL) { + EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE); + return 0; + } + } + } +#ifndef OPENSSL_NO_ENGINE + skip_to_init: +#endif + if (ctx->pctx) { + int r; + r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, + EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); + if (r <= 0 && (r != -2)) + return 0; + } + if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) + return 1; + return ctx->digest->init(ctx); +} + +int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) +{ + return ctx->update(ctx, data, count); +} + +/* The caller can assume that this removes any secret data from the context */ +int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) +{ + int ret; + ret = EVP_DigestFinal_ex(ctx, md, size); + EVP_MD_CTX_reset(ctx); + return ret; +} + +/* The caller can assume that this removes any secret data from the context */ +int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) +{ + int ret; + + OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE); + ret = ctx->digest->final(ctx, md); + if (size != NULL) + *size = ctx->digest->md_size; + if (ctx->digest->cleanup) { + ctx->digest->cleanup(ctx); + EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); + } + OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size); + return ret; +} + +int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) +{ + EVP_MD_CTX_reset(out); + return EVP_MD_CTX_copy_ex(out, in); +} + +int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) +{ + unsigned char *tmp_buf; + if ((in == NULL) || (in->digest == NULL)) { + EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED); + return 0; + } +#ifndef OPENSSL_NO_ENGINE + /* Make sure it's safe to copy a digest context using an ENGINE */ + if (in->engine && !ENGINE_init(in->engine)) { + EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB); + return 0; + } +#endif + + if (out->digest == in->digest) { + tmp_buf = out->md_data; + EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE); + } else + tmp_buf = NULL; + EVP_MD_CTX_reset(out); + memcpy(out, in, sizeof(*out)); + + /* Null these variables, since they are getting fixed up + * properly below. Anything else may cause a memleak and/or + * double free if any of the memory allocations below fail + */ + out->md_data = NULL; + out->pctx = NULL; + + if (in->md_data && out->digest->ctx_size) { + if (tmp_buf) + out->md_data = tmp_buf; + else { + out->md_data = OPENSSL_malloc(out->digest->ctx_size); + if (out->md_data == NULL) { + EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE); + return 0; + } + } + memcpy(out->md_data, in->md_data, out->digest->ctx_size); + } + + out->update = in->update; + + if (in->pctx) { + out->pctx = EVP_PKEY_CTX_dup(in->pctx); + if (!out->pctx) { + EVP_MD_CTX_reset(out); + return 0; + } + } + + if (out->digest->copy) + return out->digest->copy(out, in); + + return 1; +} + +int EVP_Digest(const void *data, size_t count, + unsigned char *md, unsigned int *size, const EVP_MD *type, + ENGINE *impl) +{ + EVP_MD_CTX *ctx = EVP_MD_CTX_new(); + int ret; + + if (ctx == NULL) + return 0; + EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT); + ret = EVP_DigestInit_ex(ctx, type, impl) + && EVP_DigestUpdate(ctx, data, count) + && EVP_DigestFinal_ex(ctx, md, size); + EVP_MD_CTX_free(ctx); + + return ret; +} + +int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2) +{ + if (ctx->digest && ctx->digest->md_ctrl) { + int ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2); + if (ret <= 0) + return 0; + return 1; + } + return 0; +} |