/src/CMake/Utilities/cmcurl/lib/sha256.c

Source
/***************************************************************************
 *                                  _   _ ____  _
 *  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 "curl_sha256.h"

#ifdef USE_MBEDTLS
#include <mbedtls/version.h>
#if MBEDTLS_VERSION_NUMBER < 0x03020000
#error "mbedTLS 3.2.0 or later required"
#endif
#include <psa/crypto_config.h>
#endif

/* Please keep the SSL backend-specific #if branches in this order:
 *
 * 1. USE_OPENSSL
 * 2. USE_WOLFSSL
 * 3. USE_GNUTLS
 * 4. USE_MBEDTLS
 * 5. USE_COMMON_CRYPTO
 * 6. 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
#include <openssl/evp.h>

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_WOLFSSL)
#include <wolfssl/options.h>
#include <wolfssl/wolfcrypt/sha256.h>

typedef struct wc_Sha256 my_sha256_ctx;

static CURLcode my_sha256_init(void *in)
{
  if(wc_InitSha256(in))
    return CURLE_FAILED_INIT;
  return CURLE_OK;
}

static void my_sha256_update(void *in,
                             const unsigned char *data,
                             unsigned int length)
{
  (void)wc_Sha256Update(in, data, (word32)length);
}

static void my_sha256_final(unsigned char *digest, void *in)
{
  (void)wc_Sha256Final(in, digest);
}

#elif defined(USE_GNUTLS)
#include <nettle/sha.h>

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) && \
  defined(PSA_WANT_ALG_SHA_256) && PSA_WANT_ALG_SHA_256  /* mbedTLS 4+ */
#include <psa/crypto.h>

typedef psa_hash_operation_t my_sha256_ctx;

static CURLcode my_sha256_init(void *ctx)
{
  memset(ctx, 0, sizeof(my_sha256_ctx));
  if(psa_hash_setup(ctx, PSA_ALG_SHA_256) != PSA_SUCCESS)
    return CURLE_OUT_OF_MEMORY;
  return CURLE_OK;
}

static void my_sha256_update(void *ctx,
                             const unsigned char *data,
                             unsigned int length)
{
  (void)psa_hash_update(ctx, data, length);
}

static void my_sha256_final(unsigned char *digest, void *ctx)
{
  size_t actual_length;
  (void)psa_hash_finish(ctx, digest, CURL_SHA256_DIGEST_LENGTH,
                        &actual_length);
}

#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>

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)
#include <wincrypt.h>

struct sha256_ctx {
  HCRYPTPROV hCryptProv;
  HCRYPTHASH hHash;
};
typedef struct sha256_ctx my_sha256_ctx;

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;
  CryptHashData(ctx->hHash, (const BYTE *)data, length, 0);
}

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 the SHA256 implementation in LibTomCrypt that was released
 * into public domain. */

#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)

#define WPA_PUT_BE64(a, val)                            \
  do {                                                  \
    (a)[0] = (unsigned char)(((uint64_t)(val)) >> 56);  \
    (a)[1] = (unsigned char)(((uint64_t)(val)) >> 48);  \
    (a)[2] = (unsigned char)(((uint64_t)(val)) >> 40);  \
    (a)[3] = (unsigned char)(((uint64_t)(val)) >> 32);  \
    (a)[4] = (unsigned char)(((uint64_t)(val)) >> 24);  \
    (a)[5] = (unsigned char)(((uint64_t)(val)) >> 16);  \
    (a)[6] = (unsigned char)(((uint64_t)(val)) >>  8);  \
    (a)[7] = (unsigned char)(((uint64_t)(val)) & 0xff); \
  } while(0)

struct sha256_state {
  uint64_t length;
  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++] = 0;
    }
    sha256_compress(md, md->buf);
    md->curlen = 0;
  }

  /* Pad up to 56 bytes of zeroes */
  while(md->curlen < 56) {
    md->buf[md->curlen++] = 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,
                       size_t len)
{
  CURLcode result;
  my_sha256_ctx ctx;

  result = my_sha256_init(&ctx);
  if(!result) {
    do {
      unsigned int ilen = (unsigned int)CURLMIN(len, UINT_MAX);
      my_sha256_update(&ctx, input, ilen);
      len -= ilen;
      input += ilen;
    } while(len);
    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 */

Coverage Report

Created: 2026-06-15 07:03

Line	Count	Source
1		/***************************************************************************
2		* _ _ ____ _
3		* Project ___\| \| \| \| _ \\| \|
4		* / __\| \| \| \| \|_) \| \|
5		* \| (__\| \|_\| \| _ <\| \|___
6		* \___\|\___/\|_\| \_\_____\|
7		*
8		* Copyright (C) Florin Petriuc, <petriuc.florin@gmail.com>
9		* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
10		*
11		* This software is licensed as described in the file COPYING, which
12		* you should have received as part of this distribution. The terms
13		* are also available at https://curl.se/docs/copyright.html.
14		*
15		* You may opt to use, copy, modify, merge, publish, distribute and/or sell
16		* copies of the Software, and permit persons to whom the Software is
17		* furnished to do so, under the terms of the COPYING file.
18		*
19		* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
20		* KIND, either express or implied.
21		*
22		* SPDX-License-Identifier: curl
23		*
24		***************************************************************************/
25		#include "curl_setup.h"
26
27		#if !defined(CURL_DISABLE_AWS) \|\| !defined(CURL_DISABLE_DIGEST_AUTH) \|\| \
28		defined(USE_LIBSSH2) \|\| defined(USE_SSL)
29
30		#include "curl_sha256.h"
31
32		#ifdef USE_MBEDTLS
33		#include <mbedtls/version.h>
34		#if MBEDTLS_VERSION_NUMBER < 0x03020000
35		#error "mbedTLS 3.2.0 or later required"
36		#endif
37		#include <psa/crypto_config.h>
38		#endif
39
40		/* Please keep the SSL backend-specific #if branches in this order:
41		*
42		* 1. USE_OPENSSL
43		* 2. USE_WOLFSSL
44		* 3. USE_GNUTLS
45		* 4. USE_MBEDTLS
46		* 5. USE_COMMON_CRYPTO
47		* 6. USE_WIN32_CRYPTO
48		*
49		* This ensures that the same SSL branch gets activated throughout this source
50		* file even if multiple backends are enabled at the same time.
51		*/
52
53		#ifdef USE_OPENSSL
54		#include <openssl/evp.h>
55
56		struct ossl_sha256_ctx {
57		EVP_MD_CTX *openssl_ctx;
58		};
59		typedef struct ossl_sha256_ctx my_sha256_ctx;
60
61		static CURLcode my_sha256_init(void *in)
62		{
63		my_sha256_ctx ctx = (my_sha256_ctx )in;
64		ctx->openssl_ctx = EVP_MD_CTX_create();
65		if(!ctx->openssl_ctx)
66		return CURLE_OUT_OF_MEMORY;
67
68		if(!EVP_DigestInit_ex(ctx->openssl_ctx, EVP_sha256(), NULL)) {
69		EVP_MD_CTX_destroy(ctx->openssl_ctx);
70		return CURLE_FAILED_INIT;
71		}
72		return CURLE_OK;
73		}
74
75		static void my_sha256_update(void *in,
76		const unsigned char *data,
77		unsigned int length)
78		{
79		my_sha256_ctx ctx = (my_sha256_ctx )in;
80		EVP_DigestUpdate(ctx->openssl_ctx, data, length);
81		}
82
83		static void my_sha256_final(unsigned char digest, void in)
84		{
85		my_sha256_ctx ctx = (my_sha256_ctx )in;
86		EVP_DigestFinal_ex(ctx->openssl_ctx, digest, NULL);
87		EVP_MD_CTX_destroy(ctx->openssl_ctx);
88		}
89
90		#elif defined(USE_WOLFSSL)
91		#include <wolfssl/options.h>
92		#include <wolfssl/wolfcrypt/sha256.h>
93
94		typedef struct wc_Sha256 my_sha256_ctx;
95
96		static CURLcode my_sha256_init(void *in)
97		{
98		if(wc_InitSha256(in))
99		return CURLE_FAILED_INIT;
100		return CURLE_OK;
101		}
102
103		static void my_sha256_update(void *in,
104		const unsigned char *data,
105		unsigned int length)
106		{
107		(void)wc_Sha256Update(in, data, (word32)length);
108		}
109
110		static void my_sha256_final(unsigned char digest, void in)
111		{
112		(void)wc_Sha256Final(in, digest);
113		}
114
115		#elif defined(USE_GNUTLS)
116		#include <nettle/sha.h>
117
118		typedef struct sha256_ctx my_sha256_ctx;
119
120		static CURLcode my_sha256_init(void *ctx)
121		{
122		sha256_init(ctx);
123		return CURLE_OK;
124		}
125
126		static void my_sha256_update(void *ctx,
127		const unsigned char *data,
128		unsigned int length)
129		{
130		sha256_update(ctx, length, data);
131		}
132
133		static void my_sha256_final(unsigned char digest, void ctx)
134		{
135		sha256_digest(ctx, SHA256_DIGEST_SIZE, digest);
136		}
137
138		#elif defined(USE_MBEDTLS) && \
139		defined(PSA_WANT_ALG_SHA_256) && PSA_WANT_ALG_SHA_256 /* mbedTLS 4+ */
140		#include <psa/crypto.h>
141
142		typedef psa_hash_operation_t my_sha256_ctx;
143
144		static CURLcode my_sha256_init(void *ctx)
145		{
146		memset(ctx, 0, sizeof(my_sha256_ctx));
147		if(psa_hash_setup(ctx, PSA_ALG_SHA_256) != PSA_SUCCESS)
148		return CURLE_OUT_OF_MEMORY;
149		return CURLE_OK;
150		}
151
152		static void my_sha256_update(void *ctx,
153		const unsigned char *data,
154		unsigned int length)
155		{
156		(void)psa_hash_update(ctx, data, length);
157		}
158
159		static void my_sha256_final(unsigned char digest, void ctx)
160		{
161		size_t actual_length;
162		(void)psa_hash_finish(ctx, digest, CURL_SHA256_DIGEST_LENGTH,
163		&actual_length);
164		}
165
166		#elif (defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && \
167		(__MAC_OS_X_VERSION_MAX_ALLOWED >= 1040)) \|\| \
168		(defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && \
169		(__IPHONE_OS_VERSION_MAX_ALLOWED >= 20000))
170		#include <CommonCrypto/CommonDigest.h>
171
172		typedef CC_SHA256_CTX my_sha256_ctx;
173
174		static CURLcode my_sha256_init(void *ctx)
175		{
176		(void)CC_SHA256_Init(ctx);
177		return CURLE_OK;
178		}
179
180		static void my_sha256_update(void *ctx,
181		const unsigned char *data,
182		unsigned int length)
183		{
184		(void)CC_SHA256_Update(ctx, data, length);
185		}
186
187		static void my_sha256_final(unsigned char digest, void ctx)
188		{
189		(void)CC_SHA256_Final(digest, ctx);
190		}
191
192		#elif defined(USE_WIN32_CRYPTO)
193		#include <wincrypt.h>
194
195		struct sha256_ctx {
196		HCRYPTPROV hCryptProv;
197		HCRYPTHASH hHash;
198		};
199		typedef struct sha256_ctx my_sha256_ctx;
200
201		static CURLcode my_sha256_init(void *in)
202		{
203		my_sha256_ctx ctx = (my_sha256_ctx )in;
204		if(!CryptAcquireContext(&ctx->hCryptProv, NULL, NULL, PROV_RSA_AES,
205		CRYPT_VERIFYCONTEXT \| CRYPT_SILENT))
206		return CURLE_OUT_OF_MEMORY;
207
208		if(!CryptCreateHash(ctx->hCryptProv, CALG_SHA_256, 0, 0, &ctx->hHash)) {
209		CryptReleaseContext(ctx->hCryptProv, 0);
210		ctx->hCryptProv = 0;
211		return CURLE_FAILED_INIT;
212		}
213
214		return CURLE_OK;
215		}
216
217		static void my_sha256_update(void *in,
218		const unsigned char *data,
219		unsigned int length)
220		{
221		my_sha256_ctx ctx = (my_sha256_ctx )in;
222		CryptHashData(ctx->hHash, (const BYTE *)data, length, 0);
223		}
224
225		static void my_sha256_final(unsigned char digest, void in)
226		{
227		my_sha256_ctx ctx = (my_sha256_ctx )in;
228		unsigned long length = 0;
229
230		CryptGetHashParam(ctx->hHash, HP_HASHVAL, NULL, &length, 0);
231		if(length == CURL_SHA256_DIGEST_LENGTH)
232		CryptGetHashParam(ctx->hHash, HP_HASHVAL, digest, &length, 0);
233
234		if(ctx->hHash)
235		CryptDestroyHash(ctx->hHash);
236
237		if(ctx->hCryptProv)
238		CryptReleaseContext(ctx->hCryptProv, 0);
239		}
240
241		#else
242
243		/* When no other crypto library is available we use this code segment */
244
245		/* This is based on the SHA256 implementation in LibTomCrypt that was released
246		* into public domain. */
247
248		#define WPA_GET_BE32(a) \
249	0	((((unsigned long)(a)[0]) << 24) \| \
250	0	(((unsigned long)(a)[1]) << 16) \| \
251	0	(((unsigned long)(a)[2]) << 8) \| \
252	0	((unsigned long)(a)[3]))
253		#define WPA_PUT_BE32(a, val) \
254	0	do { \
255	0	(a)[0] = (unsigned char)((((unsigned long)(val)) >> 24) & 0xff); \
256	0	(a)[1] = (unsigned char)((((unsigned long)(val)) >> 16) & 0xff); \
257	0	(a)[2] = (unsigned char)((((unsigned long)(val)) >> 8) & 0xff); \
258	0	(a)[3] = (unsigned char)(((unsigned long)(val)) & 0xff); \
259	0	} while(0)
260
261		#define WPA_PUT_BE64(a, val) \
262	0	do { \
263	0	(a)[0] = (unsigned char)(((uint64_t)(val)) >> 56); \
264	0	(a)[1] = (unsigned char)(((uint64_t)(val)) >> 48); \
265	0	(a)[2] = (unsigned char)(((uint64_t)(val)) >> 40); \
266	0	(a)[3] = (unsigned char)(((uint64_t)(val)) >> 32); \
267	0	(a)[4] = (unsigned char)(((uint64_t)(val)) >> 24); \
268	0	(a)[5] = (unsigned char)(((uint64_t)(val)) >> 16); \
269	0	(a)[6] = (unsigned char)(((uint64_t)(val)) >> 8); \
270	0	(a)[7] = (unsigned char)(((uint64_t)(val)) & 0xff); \
271	0	} while(0)
272
273		struct sha256_state {
274		uint64_t length;
275		unsigned long state[8], curlen;
276		unsigned char buf[64];
277		};
278		typedef struct sha256_state my_sha256_ctx;
279
280		/* The K array */
281		static const unsigned long K[64] = {
282		0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL,
283		0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL,
284		0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL,
285		0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
286		0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL,
287		0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL,
288		0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL,
289		0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
290		0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL,
291		0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL,
292		0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL,
293		0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
294		0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
295		};
296
297		/* Various logical functions */
298		#define RORc(x, y) \
299	0	(((((unsigned long)(x) & 0xFFFFFFFFUL) >> (unsigned long)((y) & 31)) \| \
300	0	((unsigned long)(x) << (unsigned long)(32 - ((y) & 31)))) & 0xFFFFFFFFUL)
301
302	0	#define Sha256_Ch(x, y, z) (z ^ (x & (y ^ z)))
303	0	#define Sha256_Maj(x, y, z) (((x \| y) & z) \| (x & y))
304	0	#define Sha256_S(x, n) RORc(x, n)
305	0	#define Sha256_R(x, n) (((x) & 0xFFFFFFFFUL) >> (n))
306
307	0	#define Sigma0(x) (Sha256_S(x, 2) ^ Sha256_S(x, 13) ^ Sha256_S(x, 22))
308	0	#define Sigma1(x) (Sha256_S(x, 6) ^ Sha256_S(x, 11) ^ Sha256_S(x, 25))
309	0	#define Gamma0(x) (Sha256_S(x, 7) ^ Sha256_S(x, 18) ^ Sha256_R(x, 3))
310	0	#define Gamma1(x) (Sha256_S(x, 17) ^ Sha256_S(x, 19) ^ Sha256_R(x, 10))
311
312		/* Compress 512 bits */
313		static int sha256_compress(struct sha256_state md, const unsigned char buf)
314	0	{
315	0	unsigned long S[8], W[64];
316	0	int i;
317
318		/* Copy state into S */
319	0	for(i = 0; i < 8; i++) {
320	0	S[i] = md->state[i];
321	0	}
322		/* copy the state into 512 bits into W[0..15] */
323	0	for(i = 0; i < 16; i++)
324	0	W[i] = WPA_GET_BE32(buf + (4 * i));
325		/* fill W[16..63] */
326	0	for(i = 16; i < 64; i++) {
327	0	W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
328	0	}
329
330		/* Compress */
331	0	#define RND(a, b, c, d, e, f, g, h, i) \
332	0	do { \
333	0	unsigned long t0 = h + Sigma1(e) + Sha256_Ch(e, f, g) + K[i] + W[i]; \
334	0	unsigned long t1 = Sigma0(a) + Sha256_Maj(a, b, c); \
335	0	d += t0; \
336	0	h = t0 + t1; \
337	0	} while(0)
338
339	0	for(i = 0; i < 64; ++i) {
340	0	unsigned long t;
341	0	RND(S[0], S[1], S[2], S[3], S[4], S[5], S[6], S[7], i);
342	0	t = S[7];
343	0	S[7] = S[6];
344	0	S[6] = S[5];
345	0	S[5] = S[4];
346	0	S[4] = S[3];
347	0	S[3] = S[2];
348	0	S[2] = S[1];
349	0	S[1] = S[0];
350	0	S[0] = t;
351	0	}
352
353		/* Feedback */
354	0	for(i = 0; i < 8; i++) {
355	0	md->state[i] = md->state[i] + S[i];
356	0	}
357
358	0	return 0;
359	0	}
360
361		/* Initialize the hash state */
362		static CURLcode my_sha256_init(void *in)
363	0	{
364	0	struct sha256_state md = (struct sha256_state )in;
365	0	md->curlen = 0;
366	0	md->length = 0;
367	0	md->state[0] = 0x6A09E667UL;
368	0	md->state[1] = 0xBB67AE85UL;
369	0	md->state[2] = 0x3C6EF372UL;
370	0	md->state[3] = 0xA54FF53AUL;
371	0	md->state[4] = 0x510E527FUL;
372	0	md->state[5] = 0x9B05688CUL;
373	0	md->state[6] = 0x1F83D9ABUL;
374	0	md->state[7] = 0x5BE0CD19UL;
375
376	0	return CURLE_OK;
377	0	}
378
379		/*
380		Process a block of memory though the hash
381		@param md The hash state
382		@param in The data to hash
383		@param inlen The length of the data (octets)
384		*/
385		static void my_sha256_update(void *ctx,
386		const unsigned char *in,
387		unsigned int len)
388	0	{
389	0	unsigned long inlen = len;
390	0	unsigned long n;
391	0	struct sha256_state md = (struct sha256_state )ctx;
392	0	#define CURL_SHA256_BLOCK_SIZE 64
393	0	if(md->curlen > sizeof(md->buf))
394	0	return;
395	0	while(inlen > 0) {
396	0	if(md->curlen == 0 && inlen >= CURL_SHA256_BLOCK_SIZE) {
397	0	if(sha256_compress(md, in) < 0)
398	0	return;
399	0	md->length += CURL_SHA256_BLOCK_SIZE * 8;
400	0	in += CURL_SHA256_BLOCK_SIZE;
401	0	inlen -= CURL_SHA256_BLOCK_SIZE;
402	0	}
403	0	else {
404	0	n = CURLMIN(inlen, (CURL_SHA256_BLOCK_SIZE - md->curlen));
405	0	memcpy(md->buf + md->curlen, in, n);
406	0	md->curlen += n;
407	0	in += n;
408	0	inlen -= n;
409	0	if(md->curlen == CURL_SHA256_BLOCK_SIZE) {
410	0	if(sha256_compress(md, md->buf) < 0)
411	0	return;
412	0	md->length += 8 * CURL_SHA256_BLOCK_SIZE;
413	0	md->curlen = 0;
414	0	}
415	0	}
416	0	}
417	0	}
418
419		/*
420		Terminate the hash to get the digest
421		@param md The hash state
422		@param out [out] The destination of the hash (32 bytes)
423		@return 0 if successful
424		*/
425		static void my_sha256_final(unsigned char out, void ctx)
426	0	{
427	0	struct sha256_state *md = ctx;
428	0	int i;
429
430	0	if(md->curlen >= sizeof(md->buf))
431	0	return;
432
433		/* Increase the length of the message */
434	0	md->length += md->curlen * 8;
435
436		/* Append the '1' bit */
437	0	md->buf[md->curlen++] = (unsigned char)0x80;
438
439		/* If the length is currently above 56 bytes we append zeros
440		* then compress. Then we can fall back to padding zeros and length
441		* encoding like normal.
442		*/
443	0	if(md->curlen > 56) {
444	0	while(md->curlen < 64) {
445	0	md->buf[md->curlen++] = 0;
446	0	}
447	0	sha256_compress(md, md->buf);
448	0	md->curlen = 0;
449	0	}
450
451		/* Pad up to 56 bytes of zeroes */
452	0	while(md->curlen < 56) {
453	0	md->buf[md->curlen++] = 0;
454	0	}
455
456		/* Store length */
457	0	WPA_PUT_BE64(md->buf + 56, md->length);
458	0	sha256_compress(md, md->buf);
459
460		/* Copy output */
461	0	for(i = 0; i < 8; i++)
462	0	WPA_PUT_BE32(out + (4 * i), md->state[i]);
463	0	}
464
465		#endif /* CRYPTO LIBS */
466
467		/*
468		* Curl_sha256it()
469		*
470		* Generates a SHA256 hash for the given input data.
471		*
472		* Parameters:
473		*
474		* output [in/out] - The output buffer.
475		* input [in] - The input data.
476		* length [in] - The input length.
477		*
478		* Returns CURLE_OK on success.
479		*/
480		CURLcode Curl_sha256it(unsigned char output, const unsigned char input,
481		size_t len)
482	0	{
483	0	CURLcode result;
484	0	my_sha256_ctx ctx;
485
486	0	result = my_sha256_init(&ctx);
487	0	if(!result) {
488	0	do {
489	0	unsigned int ilen = (unsigned int)CURLMIN(len, UINT_MAX);
490	0	my_sha256_update(&ctx, input, ilen);
491	0	len -= ilen;
492	0	input += ilen;
493	0	} while(len);
494	0	my_sha256_final(output, &ctx);
495	0	}
496	0	return result;
497	0	}
498
499		const struct HMAC_params Curl_HMAC_SHA256 = {
500		my_sha256_init, /* Hash initialization function. */
501		my_sha256_update, /* Hash update function. */
502		my_sha256_final, /* Hash computation end function. */
503		sizeof(my_sha256_ctx), /* Size of hash context structure. */
504		64, /* Maximum key length. */
505		32 /* Result size. */
506		};
507
508		#endif /* AWS, DIGEST, or libssh2 */