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Diffstat (limited to 'third_party/boringssl/common/aes-gcm.c')
-rw-r--r-- | third_party/boringssl/common/aes-gcm.c | 882 |
1 files changed, 0 insertions, 882 deletions
diff --git a/third_party/boringssl/common/aes-gcm.c b/third_party/boringssl/common/aes-gcm.c deleted file mode 100644 index 8fe5f75307..0000000000 --- a/third_party/boringssl/common/aes-gcm.c +++ /dev/null @@ -1,882 +0,0 @@ -/* ==================================================================== - * Copyright (c) 2008 The OpenSSL Project. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - * 3. All advertising materials mentioning features or use of this - * software must display the following acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" - * - * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to - * endorse or promote products derived from this software without - * prior written permission. For written permission, please contact - * openssl-core@openssl.org. - * - * 5. Products derived from this software may not be called "OpenSSL" - * nor may "OpenSSL" appear in their names without prior written - * permission of the OpenSSL Project. - * - * 6. Redistributions of any form whatsoever must retain the following - * acknowledgment: - * "This product includes software developed by the OpenSSL Project - * for use in the OpenSSL Toolkit (http://www.openssl.org/)" - * - * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY - * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR - * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; - * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, - * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED - * OF THE POSSIBILITY OF SUCH DAMAGE. - * ==================================================================== */ - -#include "aes-gcm.h" -#include "common.h" -#include "util.h" - -#define STRICT_ALIGNMENT 1 - -#define OPENSSL_memcpy memcpy -#define OPENSSL_memset memset -#define CRYPTO_memcmp safe_memcmp - -#ifdef CORE_CORTEX_M -#define GHASH_ASM -#define OPENSSL_ARM -#define __ARM_ARCH__ 7 -#endif - -static inline uint32_t CRYPTO_bswap4(uint32_t x) { - return __builtin_bswap32(x); -} - -static inline uint64_t CRYPTO_bswap8(uint64_t x) { - return __builtin_bswap64(x); -} - -static inline size_t load_word_le(const void *in) { - size_t v; - OPENSSL_memcpy(&v, in, sizeof(v)); - return v; -} - -static inline void store_word_le(void *out, size_t v) { - OPENSSL_memcpy(out, &v, sizeof(v)); -} - -#define PACK(s) ((size_t)(s) << (sizeof(size_t) * 8 - 16)) -#define REDUCE1BIT(V) \ - do { \ - if (sizeof(size_t) == 8) { \ - uint64_t T = UINT64_C(0xe100000000000000) & (0 - ((V).lo & 1)); \ - (V).lo = ((V).hi << 63) | ((V).lo >> 1); \ - (V).hi = ((V).hi >> 1) ^ T; \ - } else { \ - uint32_t T = 0xe1000000U & (0 - (uint32_t)((V).lo & 1)); \ - (V).lo = ((V).hi << 63) | ((V).lo >> 1); \ - (V).hi = ((V).hi >> 1) ^ ((uint64_t)T << 32); \ - } \ - } while (0) - -static void gcm_init_4bit(u128 Htable[16], uint64_t H[2]) { - u128 V; - - Htable[0].hi = 0; - Htable[0].lo = 0; - V.hi = H[0]; - V.lo = H[1]; - - Htable[8] = V; - REDUCE1BIT(V); - Htable[4] = V; - REDUCE1BIT(V); - Htable[2] = V; - REDUCE1BIT(V); - Htable[1] = V; - Htable[3].hi = V.hi ^ Htable[2].hi, Htable[3].lo = V.lo ^ Htable[2].lo; - V = Htable[4]; - Htable[5].hi = V.hi ^ Htable[1].hi, Htable[5].lo = V.lo ^ Htable[1].lo; - Htable[6].hi = V.hi ^ Htable[2].hi, Htable[6].lo = V.lo ^ Htable[2].lo; - Htable[7].hi = V.hi ^ Htable[3].hi, Htable[7].lo = V.lo ^ Htable[3].lo; - V = Htable[8]; - Htable[9].hi = V.hi ^ Htable[1].hi, Htable[9].lo = V.lo ^ Htable[1].lo; - Htable[10].hi = V.hi ^ Htable[2].hi, Htable[10].lo = V.lo ^ Htable[2].lo; - Htable[11].hi = V.hi ^ Htable[3].hi, Htable[11].lo = V.lo ^ Htable[3].lo; - Htable[12].hi = V.hi ^ Htable[4].hi, Htable[12].lo = V.lo ^ Htable[4].lo; - Htable[13].hi = V.hi ^ Htable[5].hi, Htable[13].lo = V.lo ^ Htable[5].lo; - Htable[14].hi = V.hi ^ Htable[6].hi, Htable[14].lo = V.lo ^ Htable[6].lo; - Htable[15].hi = V.hi ^ Htable[7].hi, Htable[15].lo = V.lo ^ Htable[7].lo; - -#if defined(GHASH_ASM) && defined(OPENSSL_ARM) - for (int j = 0; j < 16; ++j) { - V = Htable[j]; - Htable[j].hi = V.lo; - Htable[j].lo = V.hi; - } -#endif -} - -#if !defined(GHASH_ASM) || defined(OPENSSL_AARCH64) || defined(OPENSSL_PPC64LE) -static const size_t rem_4bit[16] = { - PACK(0x0000), PACK(0x1C20), PACK(0x3840), PACK(0x2460), - PACK(0x7080), PACK(0x6CA0), PACK(0x48C0), PACK(0x54E0), - PACK(0xE100), PACK(0xFD20), PACK(0xD940), PACK(0xC560), - PACK(0x9180), PACK(0x8DA0), PACK(0xA9C0), PACK(0xB5E0)}; - -static void gcm_gmult_4bit(uint64_t Xi[2], const u128 Htable[16]) { - u128 Z; - int cnt = 15; - size_t rem, nlo, nhi; - - nlo = ((const uint8_t *)Xi)[15]; - nhi = nlo >> 4; - nlo &= 0xf; - - Z.hi = Htable[nlo].hi; - Z.lo = Htable[nlo].lo; - - while (1) { - rem = (size_t)Z.lo & 0xf; - Z.lo = (Z.hi << 60) | (Z.lo >> 4); - Z.hi = (Z.hi >> 4); - if (sizeof(size_t) == 8) { - Z.hi ^= rem_4bit[rem]; - } else { - Z.hi ^= (uint64_t)rem_4bit[rem] << 32; - } - - Z.hi ^= Htable[nhi].hi; - Z.lo ^= Htable[nhi].lo; - - if (--cnt < 0) { - break; - } - - nlo = ((const uint8_t *)Xi)[cnt]; - nhi = nlo >> 4; - nlo &= 0xf; - - rem = (size_t)Z.lo & 0xf; - Z.lo = (Z.hi << 60) | (Z.lo >> 4); - Z.hi = (Z.hi >> 4); - if (sizeof(size_t) == 8) { - Z.hi ^= rem_4bit[rem]; - } else { - Z.hi ^= (uint64_t)rem_4bit[rem] << 32; - } - - Z.hi ^= Htable[nlo].hi; - Z.lo ^= Htable[nlo].lo; - } - - Xi[0] = CRYPTO_bswap8(Z.hi); - Xi[1] = CRYPTO_bswap8(Z.lo); -} - -// Streamed gcm_mult_4bit, see CRYPTO_gcm128_[en|de]crypt for -// details... Compiler-generated code doesn't seem to give any -// performance improvement, at least not on x86[_64]. It's here -// mostly as reference and a placeholder for possible future -// non-trivial optimization[s]... -static void gcm_ghash_4bit(uint64_t Xi[2], const u128 Htable[16], - const uint8_t *inp, size_t len) { - u128 Z; - int cnt; - size_t rem, nlo, nhi; - - do { - cnt = 15; - nlo = ((const uint8_t *)Xi)[15]; - nlo ^= inp[15]; - nhi = nlo >> 4; - nlo &= 0xf; - - Z.hi = Htable[nlo].hi; - Z.lo = Htable[nlo].lo; - - while (1) { - rem = (size_t)Z.lo & 0xf; - Z.lo = (Z.hi << 60) | (Z.lo >> 4); - Z.hi = (Z.hi >> 4); - if (sizeof(size_t) == 8) { - Z.hi ^= rem_4bit[rem]; - } else { - Z.hi ^= (uint64_t)rem_4bit[rem] << 32; - } - - Z.hi ^= Htable[nhi].hi; - Z.lo ^= Htable[nhi].lo; - - if (--cnt < 0) { - break; - } - - nlo = ((const uint8_t *)Xi)[cnt]; - nlo ^= inp[cnt]; - nhi = nlo >> 4; - nlo &= 0xf; - - rem = (size_t)Z.lo & 0xf; - Z.lo = (Z.hi << 60) | (Z.lo >> 4); - Z.hi = (Z.hi >> 4); - if (sizeof(size_t) == 8) { - Z.hi ^= rem_4bit[rem]; - } else { - Z.hi ^= (uint64_t)rem_4bit[rem] << 32; - } - - Z.hi ^= Htable[nlo].hi; - Z.lo ^= Htable[nlo].lo; - } - - Xi[0] = CRYPTO_bswap8(Z.hi); - Xi[1] = CRYPTO_bswap8(Z.lo); - } while (inp += 16, len -= 16); -} -#else // GHASH_ASM -void gcm_gmult_4bit(uint64_t Xi[2], const u128 Htable[16]); -void gcm_ghash_4bit(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp, - size_t len); -#endif - -#define GCM_MUL(ctx, Xi) gcm_gmult_4bit((ctx)->Xi.u, (ctx)->Htable) -#if defined(GHASH_ASM) -#define GHASH(ctx, in, len) gcm_ghash_4bit((ctx)->Xi.u, (ctx)->Htable, in, len) -// GHASH_CHUNK is "stride parameter" missioned to mitigate cache -// trashing effect. In other words idea is to hash data while it's -// still in L1 cache after encryption pass... -#define GHASH_CHUNK (3 * 1024) -#endif - - -#if defined(GHASH_ASM) - -#if defined(OPENSSL_X86) || defined(OPENSSL_X86_64) -#define GCM_FUNCREF_4BIT -void gcm_init_clmul(u128 Htable[16], const uint64_t Xi[2]); -void gcm_gmult_clmul(uint64_t Xi[2], const u128 Htable[16]); -void gcm_ghash_clmul(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp, - size_t len); - -#if defined(OPENSSL_X86_64) -#define GHASH_ASM_X86_64 -void gcm_init_avx(u128 Htable[16], const uint64_t Xi[2]); -void gcm_gmult_avx(uint64_t Xi[2], const u128 Htable[16]); -void gcm_ghash_avx(uint64_t Xi[2], const u128 Htable[16], const uint8_t *in, - size_t len); -#define AESNI_GCM -size_t aesni_gcm_encrypt(const uint8_t *in, uint8_t *out, size_t len, - const void *key, uint8_t ivec[16], uint64_t *Xi); -size_t aesni_gcm_decrypt(const uint8_t *in, uint8_t *out, size_t len, - const void *key, uint8_t ivec[16], uint64_t *Xi); -#endif - -#if defined(OPENSSL_X86) -#define GHASH_ASM_X86 -void gcm_gmult_4bit_mmx(uint64_t Xi[2], const u128 Htable[16]); -void gcm_ghash_4bit_mmx(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp, - size_t len); -#endif - -#elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64) -#if __ARM_ARCH__ >= 7 -#define GHASH_ASM_ARM -#define GCM_FUNCREF_4BIT - -#if defined(OPENSSL_ARM_PMULL) -static int pmull_capable(void) { - return CRYPTO_is_ARMv8_PMULL_capable(); -} - -void gcm_init_v8(u128 Htable[16], const uint64_t Xi[2]); -void gcm_gmult_v8(uint64_t Xi[2], const u128 Htable[16]); -void gcm_ghash_v8(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp, - size_t len); -#else -static int pmull_capable(void) { - return 0; -} -static void gcm_init_v8(u128 Htable[16], const uint64_t Xi[2]) { - -} -static void gcm_gmult_v8(uint64_t Xi[2], const u128 Htable[16]) { - -} -static void gcm_ghash_v8(uint64_t Xi[2], const u128 Htable[16], - const uint8_t *inp, size_t len) { - -} -#endif - -#if defined(OPENSSL_ARM_NEON) -// 32-bit ARM also has support for doing GCM with NEON instructions. -static int neon_capable(void) { - return CRYPTO_is_NEON_capable(); -} - -void gcm_init_neon(u128 Htable[16], const uint64_t Xi[2]); -void gcm_gmult_neon(uint64_t Xi[2], const u128 Htable[16]); -void gcm_ghash_neon(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp, - size_t len); -#else -// AArch64 only has the ARMv8 versions of functions. -static int neon_capable(void) { - return 0; -} -static void gcm_init_neon(u128 Htable[16], const uint64_t Xi[2]) { - -} -static void gcm_gmult_neon(uint64_t Xi[2], const u128 Htable[16]) { - -} -static void gcm_ghash_neon(uint64_t Xi[2], const u128 Htable[16], - const uint8_t *inp, size_t len) { - -} -#endif - -#endif -#elif defined(OPENSSL_PPC64LE) -#define GHASH_ASM_PPC64LE -#define GCM_FUNCREF_4BIT -void gcm_init_p8(u128 Htable[16], const uint64_t Xi[2]); -void gcm_gmult_p8(uint64_t Xi[2], const u128 Htable[16]); -void gcm_ghash_p8(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp, - size_t len); -#endif -#endif - -#ifdef GCM_FUNCREF_4BIT -#undef GCM_MUL -#define GCM_MUL(ctx, Xi) (*gcm_gmult_p)((ctx)->Xi.u, (ctx)->Htable) -#ifdef GHASH -#undef GHASH -#define GHASH(ctx, in, len) (*gcm_ghash_p)((ctx)->Xi.u, (ctx)->Htable, in, len) -#endif -#endif - -#ifdef GHASH -// kSizeTWithoutLower4Bits is a mask that can be used to zero the lower four -// bits of a |size_t|. -static const size_t kSizeTWithoutLower4Bits = (size_t) -16; -#endif - -static void CRYPTO_ghash_init(gmult_func *out_mult, ghash_func *out_hash, - u128 *out_key, u128 out_table[16], - const uint8_t *gcm_key) { - - union { - uint64_t u[2]; - uint8_t c[16]; - } H; - - OPENSSL_memcpy(H.c, gcm_key, 16); - - // H is stored in host byte order - H.u[0] = CRYPTO_bswap8(H.u[0]); - H.u[1] = CRYPTO_bswap8(H.u[1]); - - OPENSSL_memcpy(out_key, H.c, 16); - -#if defined(GHASH_ASM_X86_64) - if (crypto_gcm_clmul_enabled()) { - if (((OPENSSL_ia32cap_get()[1] >> 22) & 0x41) == 0x41) { // AVX+MOVBE - gcm_init_avx(out_table, H.u); - *out_mult = gcm_gmult_avx; - *out_hash = gcm_ghash_avx; - *out_is_avx = 1; - return; - } - gcm_init_clmul(out_table, H.u); - *out_mult = gcm_gmult_clmul; - *out_hash = gcm_ghash_clmul; - return; - } -#elif defined(GHASH_ASM_X86) - if (crypto_gcm_clmul_enabled()) { - gcm_init_clmul(out_table, H.u); - *out_mult = gcm_gmult_clmul; - *out_hash = gcm_ghash_clmul; - return; - } -#elif defined(GHASH_ASM_ARM) - if (pmull_capable()) { - gcm_init_v8(out_table, H.u); - *out_mult = gcm_gmult_v8; - *out_hash = gcm_ghash_v8; - return; - } - - if (neon_capable()) { - gcm_init_neon(out_table, H.u); - *out_mult = gcm_gmult_neon; - *out_hash = gcm_ghash_neon; - return; - } -#elif defined(GHASH_ASM_PPC64LE) - if (CRYPTO_is_PPC64LE_vcrypto_capable()) { - gcm_init_p8(out_table, H.u); - *out_mult = gcm_gmult_p8; - *out_hash = gcm_ghash_p8; - return; - } -#endif - - gcm_init_4bit(out_table, H.u); -#if defined(GHASH_ASM_X86) - *out_mult = gcm_gmult_4bit_mmx; - *out_hash = gcm_ghash_4bit_mmx; -#else - *out_mult = gcm_gmult_4bit; - *out_hash = gcm_ghash_4bit; -#endif -} - -void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx, const void *aes_key, - block128_f block, int block_is_hwaes) { - OPENSSL_memset(ctx, 0, sizeof(*ctx)); - ctx->block = block; - - uint8_t gcm_key[16]; - OPENSSL_memset(gcm_key, 0, sizeof(gcm_key)); - (*block)(gcm_key, gcm_key, aes_key); - - CRYPTO_ghash_init(&ctx->gmult, &ctx->ghash, &ctx->H, ctx->Htable, - gcm_key); -} - -void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx, const void *key, - const uint8_t *iv, size_t len) { - unsigned int ctr; -#ifdef GCM_FUNCREF_4BIT - void (*gcm_gmult_p)(uint64_t Xi[2], const u128 Htable[16]) = ctx->gmult; -#endif - - ctx->Yi.u[0] = 0; - ctx->Yi.u[1] = 0; - ctx->Xi.u[0] = 0; - ctx->Xi.u[1] = 0; - ctx->len.u[0] = 0; // AAD length - ctx->len.u[1] = 0; // message length - ctx->ares = 0; - ctx->mres = 0; - - if (len == 12) { - OPENSSL_memcpy(ctx->Yi.c, iv, 12); - ctx->Yi.c[15] = 1; - ctr = 1; - } else { - uint64_t len0 = len; - - while (len >= 16) { - for (size_t i = 0; i < 16; ++i) { - ctx->Yi.c[i] ^= iv[i]; - } - GCM_MUL(ctx, Yi); - iv += 16; - len -= 16; - } - if (len) { - for (size_t i = 0; i < len; ++i) { - ctx->Yi.c[i] ^= iv[i]; - } - GCM_MUL(ctx, Yi); - } - len0 <<= 3; - ctx->Yi.u[1] ^= CRYPTO_bswap8(len0); - - GCM_MUL(ctx, Yi); - ctr = CRYPTO_bswap4(ctx->Yi.d[3]); - } - - (*ctx->block)(ctx->Yi.c, ctx->EK0.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); -} - -int CRYPTO_gcm128_aad(GCM128_CONTEXT *ctx, const uint8_t *aad, size_t len) { - unsigned int n; - uint64_t alen = ctx->len.u[0]; -#ifdef GCM_FUNCREF_4BIT - void (*gcm_gmult_p)(uint64_t Xi[2], const u128 Htable[16]) = ctx->gmult; -#ifdef GHASH - void (*gcm_ghash_p)(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp, - size_t len) = ctx->ghash; -#endif -#endif - - if (ctx->len.u[1]) { - return 0; - } - - alen += len; - if (alen > (UINT64_C(1) << 61) || (sizeof(len) == 8 && alen < len)) { - return 0; - } - ctx->len.u[0] = alen; - - n = ctx->ares; - if (n) { - while (n && len) { - ctx->Xi.c[n] ^= *(aad++); - --len; - n = (n + 1) % 16; - } - if (n == 0) { - GCM_MUL(ctx, Xi); - } else { - ctx->ares = n; - return 1; - } - } - - // Process a whole number of blocks. -#ifdef GHASH - size_t len_blocks = len & kSizeTWithoutLower4Bits; - if (len_blocks != 0) { - GHASH(ctx, aad, len_blocks); - aad += len_blocks; - len -= len_blocks; - } -#else - while (len >= 16) { - for (size_t i = 0; i < 16; ++i) { - ctx->Xi.c[i] ^= aad[i]; - } - GCM_MUL(ctx, Xi); - aad += 16; - len -= 16; - } -#endif - - // Process the remainder. - if (len != 0) { - n = (unsigned int)len; - for (size_t i = 0; i < len; ++i) { - ctx->Xi.c[i] ^= aad[i]; - } - } - - ctx->ares = n; - return 1; -} - -int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx, const void *key, - const uint8_t *in, uint8_t *out, size_t len) { - unsigned int n, ctr; - uint64_t mlen = ctx->len.u[1]; - block128_f block = ctx->block; -#ifdef GCM_FUNCREF_4BIT - void (*gcm_gmult_p)(uint64_t Xi[2], const u128 Htable[16]) = ctx->gmult; -#ifdef GHASH - void (*gcm_ghash_p)(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp, - size_t len) = ctx->ghash; -#endif -#endif - - mlen += len; - if (mlen > ((UINT64_C(1) << 36) - 32) || - (sizeof(len) == 8 && mlen < len)) { - return 0; - } - ctx->len.u[1] = mlen; - - if (ctx->ares) { - // First call to encrypt finalizes GHASH(AAD) - GCM_MUL(ctx, Xi); - ctx->ares = 0; - } - - ctr = CRYPTO_bswap4(ctx->Yi.d[3]); - - n = ctx->mres; - if (n) { - while (n && len) { - ctx->Xi.c[n] ^= *(out++) = *(in++) ^ ctx->EKi.c[n]; - --len; - n = (n + 1) % 16; - } - if (n == 0) { - GCM_MUL(ctx, Xi); - } else { - ctx->mres = n; - return 1; - } - } - if (STRICT_ALIGNMENT && - ((uintptr_t)in | (uintptr_t)out) % sizeof(size_t) != 0) { - for (size_t i = 0; i < len; ++i) { - if (n == 0) { - (*block)(ctx->Yi.c, ctx->EKi.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); - } - ctx->Xi.c[n] ^= out[i] = in[i] ^ ctx->EKi.c[n]; - n = (n + 1) % 16; - if (n == 0) { - GCM_MUL(ctx, Xi); - } - } - - ctx->mres = n; - return 1; - } -#if defined(GHASH) && defined(GHASH_CHUNK) - while (len >= GHASH_CHUNK) { - size_t j = GHASH_CHUNK; - - while (j) { - (*block)(ctx->Yi.c, ctx->EKi.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); - for (size_t i = 0; i < 16; i += sizeof(size_t)) { - store_word_le(out + i, - load_word_le(in + i) ^ ctx->EKi.t[i / sizeof(size_t)]); - } - out += 16; - in += 16; - j -= 16; - } - GHASH(ctx, out - GHASH_CHUNK, GHASH_CHUNK); - len -= GHASH_CHUNK; - } - size_t len_blocks = len & kSizeTWithoutLower4Bits; - if (len_blocks != 0) { - while (len >= 16) { - (*block)(ctx->Yi.c, ctx->EKi.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); - for (size_t i = 0; i < 16; i += sizeof(size_t)) { - store_word_le(out + i, - load_word_le(in + i) ^ ctx->EKi.t[i / sizeof(size_t)]); - } - out += 16; - in += 16; - len -= 16; - } - GHASH(ctx, out - len_blocks, len_blocks); - } -#else - while (len >= 16) { - (*block)(ctx->Yi.c, ctx->EKi.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); - for (size_t i = 0; i < 16; i += sizeof(size_t)) { - size_t tmp = load_word_le(in + i) ^ ctx->EKi.t[i / sizeof(size_t)]; - store_word_le(out + i, tmp); - ctx->Xi.t[i / sizeof(size_t)] ^= tmp; - } - GCM_MUL(ctx, Xi); - out += 16; - in += 16; - len -= 16; - } -#endif - if (len) { - (*block)(ctx->Yi.c, ctx->EKi.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); - while (len--) { - ctx->Xi.c[n] ^= out[n] = in[n] ^ ctx->EKi.c[n]; - ++n; - } - } - - ctx->mres = n; - return 1; -} - -int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx, const void *key, - const unsigned char *in, unsigned char *out, - size_t len) { - unsigned int n, ctr; - uint64_t mlen = ctx->len.u[1]; - block128_f block = ctx->block; -#ifdef GCM_FUNCREF_4BIT - void (*gcm_gmult_p)(uint64_t Xi[2], const u128 Htable[16]) = ctx->gmult; -#ifdef GHASH - void (*gcm_ghash_p)(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp, - size_t len) = ctx->ghash; -#endif -#endif - - mlen += len; - if (mlen > ((UINT64_C(1) << 36) - 32) || - (sizeof(len) == 8 && mlen < len)) { - return 0; - } - ctx->len.u[1] = mlen; - - if (ctx->ares) { - // First call to decrypt finalizes GHASH(AAD) - GCM_MUL(ctx, Xi); - ctx->ares = 0; - } - - ctr = CRYPTO_bswap4(ctx->Yi.d[3]); - - n = ctx->mres; - if (n) { - while (n && len) { - uint8_t c = *(in++); - *(out++) = c ^ ctx->EKi.c[n]; - ctx->Xi.c[n] ^= c; - --len; - n = (n + 1) % 16; - } - if (n == 0) { - GCM_MUL(ctx, Xi); - } else { - ctx->mres = n; - return 1; - } - } - if (STRICT_ALIGNMENT && - ((uintptr_t)in | (uintptr_t)out) % sizeof(size_t) != 0) { - for (size_t i = 0; i < len; ++i) { - uint8_t c; - if (n == 0) { - (*block)(ctx->Yi.c, ctx->EKi.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); - } - c = in[i]; - out[i] = c ^ ctx->EKi.c[n]; - ctx->Xi.c[n] ^= c; - n = (n + 1) % 16; - if (n == 0) { - GCM_MUL(ctx, Xi); - } - } - - ctx->mres = n; - return 1; - } -#if defined(GHASH) && defined(GHASH_CHUNK) - while (len >= GHASH_CHUNK) { - size_t j = GHASH_CHUNK; - - GHASH(ctx, in, GHASH_CHUNK); - while (j) { - (*block)(ctx->Yi.c, ctx->EKi.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); - for (size_t i = 0; i < 16; i += sizeof(size_t)) { - store_word_le(out + i, - load_word_le(in + i) ^ ctx->EKi.t[i / sizeof(size_t)]); - } - out += 16; - in += 16; - j -= 16; - } - len -= GHASH_CHUNK; - } - size_t len_blocks = len & kSizeTWithoutLower4Bits; - if (len_blocks != 0) { - GHASH(ctx, in, len_blocks); - while (len >= 16) { - (*block)(ctx->Yi.c, ctx->EKi.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); - for (size_t i = 0; i < 16; i += sizeof(size_t)) { - store_word_le(out + i, - load_word_le(in + i) ^ ctx->EKi.t[i / sizeof(size_t)]); - } - out += 16; - in += 16; - len -= 16; - } - } -#else - while (len >= 16) { - (*block)(ctx->Yi.c, ctx->EKi.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); - for (size_t i = 0; i < 16; i += sizeof(size_t)) { - size_t c = load_word_le(in + i); - store_word_le(out + i, c ^ ctx->EKi.t[i / sizeof(size_t)]); - ctx->Xi.t[i / sizeof(size_t)] ^= c; - } - GCM_MUL(ctx, Xi); - out += 16; - in += 16; - len -= 16; - } -#endif - if (len) { - (*block)(ctx->Yi.c, ctx->EKi.c, key); - ++ctr; - ctx->Yi.d[3] = CRYPTO_bswap4(ctr); - while (len--) { - uint8_t c = in[n]; - ctx->Xi.c[n] ^= c; - out[n] = c ^ ctx->EKi.c[n]; - ++n; - } - } - - ctx->mres = n; - return 1; -} - -int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx, const uint8_t *tag, size_t len) { - uint64_t alen = ctx->len.u[0] << 3; - uint64_t clen = ctx->len.u[1] << 3; -#ifdef GCM_FUNCREF_4BIT - void (*gcm_gmult_p)(uint64_t Xi[2], const u128 Htable[16]) = ctx->gmult; -#endif - - if (ctx->mres || ctx->ares) { - GCM_MUL(ctx, Xi); - } - - alen = CRYPTO_bswap8(alen); - clen = CRYPTO_bswap8(clen); - - ctx->Xi.u[0] ^= alen; - ctx->Xi.u[1] ^= clen; - GCM_MUL(ctx, Xi); - - ctx->Xi.u[0] ^= ctx->EK0.u[0]; - ctx->Xi.u[1] ^= ctx->EK0.u[1]; - - if (tag && len <= sizeof(ctx->Xi)) { - return CRYPTO_memcmp(ctx->Xi.c, tag, len) == 0; - } else { - return 0; - } -} - -void CRYPTO_gcm128_tag(GCM128_CONTEXT *ctx, unsigned char *tag, size_t len) { - CRYPTO_gcm128_finish(ctx, NULL, 0); - OPENSSL_memcpy(tag, ctx->Xi.c, - len <= sizeof(ctx->Xi.c) ? len : sizeof(ctx->Xi.c)); -} - -#if defined(OPENSSL_X86) || defined(OPENSSL_X86_64) -int crypto_gcm_clmul_enabled(void) { -#ifdef GHASH_ASM - const uint32_t *ia32cap = OPENSSL_ia32cap_get(); - return (ia32cap[0] & (1 << 24)) && // check FXSR bit - (ia32cap[1] & (1 << 1)); // check PCLMULQDQ bit -#else - return 0; -#endif -} -#endif |