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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2016, Florin Petriuc, <petriuc.florin@gmail.com>
+ *
+ * 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.haxx.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.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#ifndef CURL_DISABLE_CRYPTO_AUTH
+
+#include "warnless.h"
+#include "curl_sha256.h"
+
+#if defined(USE_OPENSSL)
+
+/* When OpenSSL is available we use the SHA256-function from OpenSSL */
+#include <openssl/sha.h>
+
+#else
+
+/* When no other crypto library is available we use this code segment */
+
+/* ===== start - public domain SHA256 implementation ===== */
+/* 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
+
+typedef struct sha256_state {
+#ifdef HAVE_LONGLONG
+ unsigned long long length;
+#else
+ unsigned __int64 length;
+#endif
+ unsigned long state[8], curlen;
+ unsigned char buf[64];
+} 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 Ch(x,y,z) (z ^ (x & (y ^ z)))
+#define Maj(x,y,z) (((x | y) & z) | (x & y))
+#define S(x, n) RORc((x), (n))
+#define R(x, n) (((x)&0xFFFFFFFFUL)>>(n))
+#define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22))
+#define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25))
+#define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3))
+#define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10))
+#ifndef MIN
+#define MIN(x, y) (((x) < (y)) ? (x) : (y))
+#endif
+/* compress 512-bits */
+static int sha256_compress(struct sha256_state *md,
+ unsigned char *buf)
+{
+ unsigned long S[8], W[64], t0, t1;
+ unsigned long t;
+ 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) \
+ t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
+ t1 = Sigma0(a) + Maj(a, b, c); \
+ d += t0; \
+ h = t0 + t1;
+ for(i = 0; i < 64; ++i) {
+ 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 void SHA256_Init(struct sha256_state *md)
+{
+ 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;
+}
+/**
+ 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)
+ @return CRYPT_OK if successful
+*/
+static int SHA256_Update(struct sha256_state *md,
+ const unsigned char *in,
+ unsigned long inlen)
+{
+ unsigned long n;
+#define block_size 64
+ if(md->curlen > sizeof(md->buf))
+ return -1;
+ while(inlen > 0) {
+ if(md->curlen == 0 && inlen >= block_size) {
+ if(sha256_compress(md, (unsigned char *)in) < 0)
+ return -1;
+ md->length += block_size * 8;
+ in += block_size;
+ inlen -= block_size;
+ }
+ else {
+ n = MIN(inlen, (block_size - md->curlen));
+ memcpy(md->buf + md->curlen, in, n);
+ md->curlen += n;
+ in += n;
+ inlen -= n;
+ if(md->curlen == block_size) {
+ if(sha256_compress(md, md->buf) < 0)
+ return -1;
+ md->length += 8 * block_size;
+ md->curlen = 0;
+ }
+ }
+ }
+ return 0;
+}
+/**
+ Terminate the hash to get the digest
+ @param md The hash state
+ @param out [out] The destination of the hash (32 bytes)
+ @return CRYPT_OK if successful
+*/
+static int SHA256_Final(unsigned char *out,
+ struct sha256_state *md)
+{
+ int i;
+ if(md->curlen >= sizeof(md->buf))
+ return -1;
+ /* 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 upto 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]);
+ return 0;
+}
+/* ===== end - public domain SHA256 implementation ===== */
+
+#endif
+
+void Curl_sha256it(unsigned char *outbuffer, /* 32 unsigned chars */
+ const unsigned char *input)
+{
+ SHA256_CTX ctx;
+ SHA256_Init(&ctx);
+ SHA256_Update(&ctx, input, curlx_uztoui(strlen((char *)input)));
+ SHA256_Final(outbuffer, &ctx);
+}
+
+#endif /* CURL_DISABLE_CRYPTO_AUTH */
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