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252 lines
6.3 KiB
C
252 lines
6.3 KiB
C
/*
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* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "internal/cryptlib.h"
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#include <openssl/hmac.h>
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#include <openssl/opensslconf.h>
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#include "hmac_local.h"
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int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
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const EVP_MD *md, ENGINE *impl)
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{
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int rv = 0, reset = 0;
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int i, j;
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unsigned char pad[HMAC_MAX_MD_CBLOCK_SIZE];
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unsigned int keytmp_length;
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unsigned char keytmp[HMAC_MAX_MD_CBLOCK_SIZE];
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/* If we are changing MD then we must have a key */
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if (md != NULL && md != ctx->md && (key == NULL || len < 0))
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return 0;
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if (md != NULL) {
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ctx->md = md;
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} else if (ctx->md) {
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md = ctx->md;
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} else {
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return 0;
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}
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/*
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* The HMAC construction is not allowed to be used with the
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* extendable-output functions (XOF) shake128 and shake256.
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*/
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if ((EVP_MD_meth_get_flags(md) & EVP_MD_FLAG_XOF) != 0)
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return 0;
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if (key != NULL) {
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reset = 1;
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j = EVP_MD_block_size(md);
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if (!ossl_assert(j <= (int)sizeof(keytmp)))
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return 0;
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if (j < len) {
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if (!EVP_DigestInit_ex(ctx->md_ctx, md, impl)
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|| !EVP_DigestUpdate(ctx->md_ctx, key, len)
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|| !EVP_DigestFinal_ex(ctx->md_ctx, keytmp,
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&keytmp_length))
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return 0;
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} else {
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if (len < 0 || len > (int)sizeof(keytmp))
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return 0;
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memcpy(keytmp, key, len);
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keytmp_length = len;
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}
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if (keytmp_length != HMAC_MAX_MD_CBLOCK_SIZE)
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memset(&keytmp[keytmp_length], 0,
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HMAC_MAX_MD_CBLOCK_SIZE - keytmp_length);
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for (i = 0; i < HMAC_MAX_MD_CBLOCK_SIZE; i++)
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pad[i] = 0x36 ^ keytmp[i];
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if (!EVP_DigestInit_ex(ctx->i_ctx, md, impl)
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|| !EVP_DigestUpdate(ctx->i_ctx, pad, EVP_MD_block_size(md)))
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goto err;
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for (i = 0; i < HMAC_MAX_MD_CBLOCK_SIZE; i++)
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pad[i] = 0x5c ^ keytmp[i];
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if (!EVP_DigestInit_ex(ctx->o_ctx, md, impl)
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|| !EVP_DigestUpdate(ctx->o_ctx, pad, EVP_MD_block_size(md)))
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goto err;
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}
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if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->i_ctx))
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goto err;
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rv = 1;
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err:
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if (reset) {
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OPENSSL_cleanse(keytmp, sizeof(keytmp));
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OPENSSL_cleanse(pad, sizeof(pad));
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}
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return rv;
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}
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#if OPENSSL_API_COMPAT < 0x10100000L
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int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
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{
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if (key && md)
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HMAC_CTX_reset(ctx);
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return HMAC_Init_ex(ctx, key, len, md, NULL);
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}
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#endif
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int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
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{
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if (!ctx->md)
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return 0;
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return EVP_DigestUpdate(ctx->md_ctx, data, len);
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}
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int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
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{
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unsigned int i;
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unsigned char buf[EVP_MAX_MD_SIZE];
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if (!ctx->md)
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goto err;
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if (!EVP_DigestFinal_ex(ctx->md_ctx, buf, &i))
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goto err;
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if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->o_ctx))
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goto err;
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if (!EVP_DigestUpdate(ctx->md_ctx, buf, i))
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goto err;
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if (!EVP_DigestFinal_ex(ctx->md_ctx, md, len))
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goto err;
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return 1;
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err:
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return 0;
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}
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size_t HMAC_size(const HMAC_CTX *ctx)
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{
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int size = EVP_MD_size((ctx)->md);
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return (size < 0) ? 0 : size;
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}
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HMAC_CTX *HMAC_CTX_new(void)
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{
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HMAC_CTX *ctx = OPENSSL_zalloc(sizeof(HMAC_CTX));
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if (ctx != NULL) {
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if (!HMAC_CTX_reset(ctx)) {
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HMAC_CTX_free(ctx);
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return NULL;
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}
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}
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return ctx;
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}
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static void hmac_ctx_cleanup(HMAC_CTX *ctx)
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{
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EVP_MD_CTX_reset(ctx->i_ctx);
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EVP_MD_CTX_reset(ctx->o_ctx);
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EVP_MD_CTX_reset(ctx->md_ctx);
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ctx->md = NULL;
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}
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void HMAC_CTX_free(HMAC_CTX *ctx)
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{
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if (ctx != NULL) {
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hmac_ctx_cleanup(ctx);
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EVP_MD_CTX_free(ctx->i_ctx);
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EVP_MD_CTX_free(ctx->o_ctx);
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EVP_MD_CTX_free(ctx->md_ctx);
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OPENSSL_free(ctx);
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}
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}
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static int hmac_ctx_alloc_mds(HMAC_CTX *ctx)
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{
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if (ctx->i_ctx == NULL)
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ctx->i_ctx = EVP_MD_CTX_new();
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if (ctx->i_ctx == NULL)
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return 0;
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if (ctx->o_ctx == NULL)
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ctx->o_ctx = EVP_MD_CTX_new();
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if (ctx->o_ctx == NULL)
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return 0;
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if (ctx->md_ctx == NULL)
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ctx->md_ctx = EVP_MD_CTX_new();
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if (ctx->md_ctx == NULL)
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return 0;
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return 1;
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}
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int HMAC_CTX_reset(HMAC_CTX *ctx)
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{
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hmac_ctx_cleanup(ctx);
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if (!hmac_ctx_alloc_mds(ctx)) {
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hmac_ctx_cleanup(ctx);
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return 0;
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}
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return 1;
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}
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int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
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{
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if (!hmac_ctx_alloc_mds(dctx))
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goto err;
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if (!EVP_MD_CTX_copy_ex(dctx->i_ctx, sctx->i_ctx))
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goto err;
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if (!EVP_MD_CTX_copy_ex(dctx->o_ctx, sctx->o_ctx))
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goto err;
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if (!EVP_MD_CTX_copy_ex(dctx->md_ctx, sctx->md_ctx))
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goto err;
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dctx->md = sctx->md;
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return 1;
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err:
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hmac_ctx_cleanup(dctx);
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return 0;
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}
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unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
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const unsigned char *d, size_t n, unsigned char *md,
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unsigned int *md_len)
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{
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HMAC_CTX *c = NULL;
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static unsigned char m[EVP_MAX_MD_SIZE];
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static const unsigned char dummy_key[1] = {'\0'};
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if (md == NULL)
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md = m;
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if ((c = HMAC_CTX_new()) == NULL)
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goto err;
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/* For HMAC_Init_ex, NULL key signals reuse. */
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if (key == NULL && key_len == 0) {
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key = dummy_key;
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}
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if (!HMAC_Init_ex(c, key, key_len, evp_md, NULL))
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goto err;
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if (!HMAC_Update(c, d, n))
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goto err;
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if (!HMAC_Final(c, md, md_len))
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goto err;
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HMAC_CTX_free(c);
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return md;
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err:
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HMAC_CTX_free(c);
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return NULL;
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}
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void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
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{
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EVP_MD_CTX_set_flags(ctx->i_ctx, flags);
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EVP_MD_CTX_set_flags(ctx->o_ctx, flags);
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EVP_MD_CTX_set_flags(ctx->md_ctx, flags);
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}
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const EVP_MD *HMAC_CTX_get_md(const HMAC_CTX *ctx)
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{
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return ctx->md;
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}
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