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