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da9494eef0
curl-curl/lib/sha256.c
Viktor Szakats f4e23950c7
build: enable -Wcast-qual, fix or silence compiler warnings 
The issues found fell into these categories, with the applied fixes:

- const was accidentally stripped.
  Adjust code to not cast or cast with const.

- const/volatile missing from arguments, local variables.
  Constify arguments or variables, adjust/delete casts. Small code
  changes in a few places.

- const must be stripped because an API dependency requires it.
  Strip `const` with `CURL_UNCONST()` macro to silence the warning out
  of our control. These happen at API boundaries. Sometimes they depend
  on dependency version, which this patch handles as necessary. Also
  enable const support for the zlib API, using `ZLIB_CONST`. Supported
  by zlib 1.2.5.2 and newer.

- const must be stripped because a curl API requires it.
  Strip `const` with `CURL_UNCONST()` macro to silence the warning out
  of our immediate control. For example we promise to send a non-const
  argument to a callback, though the data is const internally.

- other cases where we may avoid const stripping by code changes.
  Also silenced with `CURL_UNCONST()`.

- there are 3 places where `CURL_UNCONST()` is cast again to const.
  To silence this type of warning:
  ```
  lib/vquic/curl_osslq.c:1015:29: error: to be safe all intermediate
    pointers in cast from 'unsigned char **' to 'const unsigned char **'
    must be 'const' qualified [-Werror=cast-qual]
  lib/cf-socket.c:734:32: error: to be safe all intermediate pointers in
    cast from 'char **' to 'const char **' must be 'const' qualified
    [-Werror=cast-qual]
  ```
  There may be a better solution, but I couldn't find it.

These cases are handled in separate subcommits, but without further
markup.

If you see a `-Wcast-qual` warning in curl, we appreciate your report
about it.

Closes #16142
2025-03-10 22:30:15 +01:00

516 lines
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Florin Petriuc, <petriuc.florin@gmail.com>
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#if !defined(CURL_DISABLE_AWS) || !defined(CURL_DISABLE_DIGEST_AUTH) \
|| defined(USE_LIBSSH2) || defined(USE_SSL)
#include "warnless.h"
#include "curl_sha256.h"
#include "curl_hmac.h"
#ifdef USE_OPENSSL
#include <openssl/evp.h>
#elif defined(USE_GNUTLS)
#include <nettle/sha.h>
#elif defined(USE_MBEDTLS)
#include <mbedtls/version.h>
#if(MBEDTLS_VERSION_NUMBER >= 0x02070000) && \
(MBEDTLS_VERSION_NUMBER < 0x03000000)
#define HAS_MBEDTLS_RESULT_CODE_BASED_FUNCTIONS
#endif
#include <mbedtls/sha256.h>
#elif (defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && \
(__MAC_OS_X_VERSION_MAX_ALLOWED >= 1040)) || \
(defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && \
(__IPHONE_OS_VERSION_MAX_ALLOWED >= 20000))
#include <CommonCrypto/CommonDigest.h>
#define AN_APPLE_OS
#elif defined(USE_WIN32_CRYPTO)
#include <wincrypt.h>
#endif
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
/* Please keep the SSL backend-specific #if branches in this order:
*
* 1. USE_OPENSSL
* 2. USE_GNUTLS
* 3. USE_MBEDTLS
* 4. USE_COMMON_CRYPTO
* 5. USE_WIN32_CRYPTO
*
* This ensures that the same SSL branch gets activated throughout this source
* file even if multiple backends are enabled at the same time.
*/
#ifdef USE_OPENSSL
struct ossl_sha256_ctx {
EVP_MD_CTX *openssl_ctx;
};
typedef struct ossl_sha256_ctx my_sha256_ctx;
static CURLcode my_sha256_init(void *in)
{
my_sha256_ctx *ctx = (my_sha256_ctx *)in;
ctx->openssl_ctx = EVP_MD_CTX_create();
if(!ctx->openssl_ctx)
return CURLE_OUT_OF_MEMORY;
if(!EVP_DigestInit_ex(ctx->openssl_ctx, EVP_sha256(), NULL)) {
EVP_MD_CTX_destroy(ctx->openssl_ctx);
return CURLE_FAILED_INIT;
}
return CURLE_OK;
}
static void my_sha256_update(void *in,
const unsigned char *data,
unsigned int length)
{
my_sha256_ctx *ctx = (my_sha256_ctx *)in;
EVP_DigestUpdate(ctx->openssl_ctx, data, length);
}
static void my_sha256_final(unsigned char *digest, void *in)
{
my_sha256_ctx *ctx = (my_sha256_ctx *)in;
EVP_DigestFinal_ex(ctx->openssl_ctx, digest, NULL);
EVP_MD_CTX_destroy(ctx->openssl_ctx);
}
#elif defined(USE_GNUTLS)
typedef struct sha256_ctx my_sha256_ctx;
static CURLcode my_sha256_init(void *ctx)
{
sha256_init(ctx);
return CURLE_OK;
}
static void my_sha256_update(void *ctx,
const unsigned char *data,
unsigned int length)
{
sha256_update(ctx, length, data);
}
static void my_sha256_final(unsigned char *digest, void *ctx)
{
sha256_digest(ctx, SHA256_DIGEST_SIZE, digest);
}
#elif defined(USE_MBEDTLS)
typedef mbedtls_sha256_context my_sha256_ctx;
static CURLcode my_sha256_init(void *ctx)
{
#if !defined(HAS_MBEDTLS_RESULT_CODE_BASED_FUNCTIONS)
(void) mbedtls_sha256_starts(ctx, 0);
#else
(void) mbedtls_sha256_starts_ret(ctx, 0);
#endif
return CURLE_OK;
}
static void my_sha256_update(void *ctx,
const unsigned char *data,
unsigned int length)
{
#if !defined(HAS_MBEDTLS_RESULT_CODE_BASED_FUNCTIONS)
(void) mbedtls_sha256_update(ctx, data, length);
#else
(void) mbedtls_sha256_update_ret(ctx, data, length);
#endif
}
static void my_sha256_final(unsigned char *digest, void *ctx)
{
#if !defined(HAS_MBEDTLS_RESULT_CODE_BASED_FUNCTIONS)
(void) mbedtls_sha256_finish(ctx, digest);
#else
(void) mbedtls_sha256_finish_ret(ctx, digest);
#endif
}
#elif defined(AN_APPLE_OS)
typedef CC_SHA256_CTX my_sha256_ctx;
static CURLcode my_sha256_init(void *ctx)
{
(void) CC_SHA256_Init(ctx);
return CURLE_OK;
}
static void my_sha256_update(void *ctx,
const unsigned char *data,
unsigned int length)
{
(void) CC_SHA256_Update(ctx, data, length);
}
static void my_sha256_final(unsigned char *digest, void *ctx)
{
(void) CC_SHA256_Final(digest, ctx);
}
#elif defined(USE_WIN32_CRYPTO)
struct sha256_ctx {
HCRYPTPROV hCryptProv;
HCRYPTHASH hHash;
};
typedef struct sha256_ctx my_sha256_ctx;
#if !defined(CALG_SHA_256)
#define CALG_SHA_256 0x0000800c
#endif
static CURLcode my_sha256_init(void *in)
{
my_sha256_ctx *ctx = (my_sha256_ctx *)in;
if(!CryptAcquireContext(&ctx->hCryptProv, NULL, NULL, PROV_RSA_AES,
CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
return CURLE_OUT_OF_MEMORY;
if(!CryptCreateHash(ctx->hCryptProv, CALG_SHA_256, 0, 0, &ctx->hHash)) {
CryptReleaseContext(ctx->hCryptProv, 0);
ctx->hCryptProv = 0;
return CURLE_FAILED_INIT;
}
return CURLE_OK;
}
static void my_sha256_update(void *in,
const unsigned char *data,
unsigned int length)
{
my_sha256_ctx *ctx = (my_sha256_ctx *)in;
#ifdef __MINGW32CE__
CryptHashData(ctx->hHash, (BYTE *)CURL_UNCONST(data), length, 0);
#else
CryptHashData(ctx->hHash, (const BYTE *)data, length, 0);
#endif
}
static void my_sha256_final(unsigned char *digest, void *in)
{
my_sha256_ctx *ctx = (my_sha256_ctx *)in;
unsigned long length = 0;
CryptGetHashParam(ctx->hHash, HP_HASHVAL, NULL, &length, 0);
if(length == CURL_SHA256_DIGEST_LENGTH)
CryptGetHashParam(ctx->hHash, HP_HASHVAL, digest, &length, 0);
if(ctx->hHash)
CryptDestroyHash(ctx->hHash);
if(ctx->hCryptProv)
CryptReleaseContext(ctx->hCryptProv, 0);
}
#else
/* When no other crypto library is available we use this code segment */
/* This is based on SHA256 implementation in LibTomCrypt that was released into
* public domain by Tom St Denis. */
#define WPA_GET_BE32(a) ((((unsigned long)(a)[0]) << 24) | \
(((unsigned long)(a)[1]) << 16) | \
(((unsigned long)(a)[2]) << 8) | \
((unsigned long)(a)[3]))
#define WPA_PUT_BE32(a, val) \
do { \
(a)[0] = (unsigned char)((((unsigned long) (val)) >> 24) & 0xff); \
(a)[1] = (unsigned char)((((unsigned long) (val)) >> 16) & 0xff); \
(a)[2] = (unsigned char)((((unsigned long) (val)) >> 8) & 0xff); \
(a)[3] = (unsigned char)(((unsigned long) (val)) & 0xff); \
} while(0)
#ifdef HAVE_LONGLONG
#define WPA_PUT_BE64(a, val) \
do { \
(a)[0] = (unsigned char)(((unsigned long long)(val)) >> 56); \
(a)[1] = (unsigned char)(((unsigned long long)(val)) >> 48); \
(a)[2] = (unsigned char)(((unsigned long long)(val)) >> 40); \
(a)[3] = (unsigned char)(((unsigned long long)(val)) >> 32); \
(a)[4] = (unsigned char)(((unsigned long long)(val)) >> 24); \
(a)[5] = (unsigned char)(((unsigned long long)(val)) >> 16); \
(a)[6] = (unsigned char)(((unsigned long long)(val)) >> 8); \
(a)[7] = (unsigned char)(((unsigned long long)(val)) & 0xff); \
} while(0)
#else
#define WPA_PUT_BE64(a, val) \
do { \
(a)[0] = (unsigned char)(((unsigned __int64)(val)) >> 56); \
(a)[1] = (unsigned char)(((unsigned __int64)(val)) >> 48); \
(a)[2] = (unsigned char)(((unsigned __int64)(val)) >> 40); \
(a)[3] = (unsigned char)(((unsigned __int64)(val)) >> 32); \
(a)[4] = (unsigned char)(((unsigned __int64)(val)) >> 24); \
(a)[5] = (unsigned char)(((unsigned __int64)(val)) >> 16); \
(a)[6] = (unsigned char)(((unsigned __int64)(val)) >> 8); \
(a)[7] = (unsigned char)(((unsigned __int64)(val)) & 0xff); \
} while(0)
#endif
struct sha256_state {
#ifdef HAVE_LONGLONG
unsigned long long length;
#else
unsigned __int64 length;
#endif
unsigned long state[8], curlen;
unsigned char buf[64];
};
typedef struct sha256_state my_sha256_ctx;
/* The K array */
static const unsigned long K[64] = {
0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL,
0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL,
0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL,
0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL,
0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL,
0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL,
0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL,
0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL,
0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL,
0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
};
/* Various logical functions */
#define RORc(x, y) \
(((((unsigned long)(x) & 0xFFFFFFFFUL) >> (unsigned long)((y) & 31)) | \
((unsigned long)(x) << (unsigned long)(32 - ((y) & 31)))) & 0xFFFFFFFFUL)
#define Sha256_Ch(x,y,z) (z ^ (x & (y ^ z)))
#define Sha256_Maj(x,y,z) (((x | y) & z) | (x & y))
#define Sha256_S(x, n) RORc((x), (n))
#define Sha256_R(x, n) (((x)&0xFFFFFFFFUL)>>(n))
#define Sigma0(x) (Sha256_S(x, 2) ^ Sha256_S(x, 13) ^ Sha256_S(x, 22))
#define Sigma1(x) (Sha256_S(x, 6) ^ Sha256_S(x, 11) ^ Sha256_S(x, 25))
#define Gamma0(x) (Sha256_S(x, 7) ^ Sha256_S(x, 18) ^ Sha256_R(x, 3))
#define Gamma1(x) (Sha256_S(x, 17) ^ Sha256_S(x, 19) ^ Sha256_R(x, 10))
/* Compress 512-bits */
static int sha256_compress(struct sha256_state *md,
const unsigned char *buf)
{
unsigned long S[8], W[64];
int i;
/* Copy state into S */
for(i = 0; i < 8; i++) {
S[i] = md->state[i];
}
/* copy the state into 512-bits into W[0..15] */
for(i = 0; i < 16; i++)
W[i] = WPA_GET_BE32(buf + (4 * i));
/* fill W[16..63] */
for(i = 16; i < 64; i++) {
W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) +
W[i - 16];
}
/* Compress */
#define RND(a,b,c,d,e,f,g,h,i) \
do { \
unsigned long t0 = h + Sigma1(e) + Sha256_Ch(e, f, g) + K[i] + W[i]; \
unsigned long t1 = Sigma0(a) + Sha256_Maj(a, b, c); \
d += t0; \
h = t0 + t1; \
} while(0)
for(i = 0; i < 64; ++i) {
unsigned long t;
RND(S[0], S[1], S[2], S[3], S[4], S[5], S[6], S[7], i);
t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4];
S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t;
}
/* Feedback */
for(i = 0; i < 8; i++) {
md->state[i] = md->state[i] + S[i];
}
return 0;
}
/* Initialize the hash state */
static CURLcode my_sha256_init(void *in)
{
struct sha256_state *md = (struct sha256_state *)in;
md->curlen = 0;
md->length = 0;
md->state[0] = 0x6A09E667UL;
md->state[1] = 0xBB67AE85UL;
md->state[2] = 0x3C6EF372UL;
md->state[3] = 0xA54FF53AUL;
md->state[4] = 0x510E527FUL;
md->state[5] = 0x9B05688CUL;
md->state[6] = 0x1F83D9ABUL;
md->state[7] = 0x5BE0CD19UL;
return CURLE_OK;
}
/*
Process a block of memory though the hash
@param md The hash state
@param in The data to hash
@param inlen The length of the data (octets)
*/
static void my_sha256_update(void *ctx,
const unsigned char *in,
unsigned int len)
{
unsigned long inlen = len;
unsigned long n;
struct sha256_state *md = (struct sha256_state *)ctx;
#define CURL_SHA256_BLOCK_SIZE 64
if(md->curlen > sizeof(md->buf))
return;
while(inlen > 0) {
if(md->curlen == 0 && inlen >= CURL_SHA256_BLOCK_SIZE) {
if(sha256_compress(md, in) < 0)
return;
md->length += CURL_SHA256_BLOCK_SIZE * 8;
in += CURL_SHA256_BLOCK_SIZE;
inlen -= CURL_SHA256_BLOCK_SIZE;
}
else {
n = CURLMIN(inlen, (CURL_SHA256_BLOCK_SIZE - md->curlen));
memcpy(md->buf + md->curlen, in, n);
md->curlen += n;
in += n;
inlen -= n;
if(md->curlen == CURL_SHA256_BLOCK_SIZE) {
if(sha256_compress(md, md->buf) < 0)
return;
md->length += 8 * CURL_SHA256_BLOCK_SIZE;
md->curlen = 0;
}
}
}
}
/*
Terminate the hash to get the digest
@param md The hash state
@param out [out] The destination of the hash (32 bytes)
@return 0 if successful
*/
static void my_sha256_final(unsigned char *out, void *ctx)
{
struct sha256_state *md = ctx;
int i;
if(md->curlen >= sizeof(md->buf))
return;
/* Increase the length of the message */
md->length += md->curlen * 8;
/* Append the '1' bit */
md->buf[md->curlen++] = (unsigned char)0x80;
/* If the length is currently above 56 bytes we append zeros
* then compress. Then we can fall back to padding zeros and length
* encoding like normal.
*/
if(md->curlen > 56) {
while(md->curlen < 64) {
md->buf[md->curlen++] = (unsigned char)0;
}
sha256_compress(md, md->buf);
md->curlen = 0;
}
/* Pad up to 56 bytes of zeroes */
while(md->curlen < 56) {
md->buf[md->curlen++] = (unsigned char)0;
}
/* Store length */
WPA_PUT_BE64(md->buf + 56, md->length);
sha256_compress(md, md->buf);
/* Copy output */
for(i = 0; i < 8; i++)
WPA_PUT_BE32(out + (4 * i), md->state[i]);
}
#endif /* CRYPTO LIBS */
/*
* Curl_sha256it()
*
* Generates a SHA256 hash for the given input data.
*
* Parameters:
*
* output [in/out] - The output buffer.
* input [in] - The input data.
* length [in] - The input length.
*
* Returns CURLE_OK on success.
*/
CURLcode Curl_sha256it(unsigned char *output, const unsigned char *input,
const size_t length)
{
CURLcode result;
my_sha256_ctx ctx;
result = my_sha256_init(&ctx);
if(!result) {
my_sha256_update(&ctx, input, curlx_uztoui(length));
my_sha256_final(output, &ctx);
}
return result;
}
const struct HMAC_params Curl_HMAC_SHA256 = {
my_sha256_init, /* Hash initialization function. */
my_sha256_update, /* Hash update function. */
my_sha256_final, /* Hash computation end function. */
sizeof(my_sha256_ctx), /* Size of hash context structure. */
64, /* Maximum key length. */
32 /* Result size. */
};
#endif /* AWS, DIGEST, or libssh2 */
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