/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) Florin Petriuc, * Copyright (C) Daniel Stenberg, , 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) #include "warnless.h" #include "curl_sha256.h" #include "curl_hmac.h" #ifdef USE_WOLFSSL #include #endif #if defined(USE_OPENSSL) #include #if (OPENSSL_VERSION_NUMBER >= 0x0090800fL) #define USE_OPENSSL_SHA256 #endif #endif /* USE_OPENSSL */ #ifdef USE_MBEDTLS #include #if(MBEDTLS_VERSION_NUMBER >= 0x02070000) && \ (MBEDTLS_VERSION_NUMBER < 0x03000000) #define HAS_MBEDTLS_RESULT_CODE_BASED_FUNCTIONS #endif #endif /* USE_MBEDTLS */ #if defined(USE_OPENSSL_SHA256) /* When OpenSSL or wolfSSL is available we use their SHA256-functions. */ #if defined(USE_OPENSSL) #include #elif defined(USE_WOLFSSL) #include #endif #elif defined(USE_GNUTLS) #include #elif defined(USE_MBEDTLS) #include #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 #define AN_APPLE_OS #elif defined(USE_WIN32_CRYPTO) #include #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. */ #if defined(USE_OPENSSL_SHA256) 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; CryptHashData(ctx->hHash, (unsigned char *) 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 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, 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, (unsigned char *)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 */