|
- /* ====================================================================
- * 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 <openssl/modes.h>
-
- #include <assert.h>
- #include <string.h>
-
- #include <openssl/mem.h>
- #include <openssl/cpu.h>
-
- #include "internal.h"
- #include "../internal.h"
-
-
- #if !defined(OPENSSL_NO_ASM) && \
- (defined(OPENSSL_X86) || defined(OPENSSL_X86_64) || \
- defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64))
- #define GHASH_ASM
- #endif
-
- #if defined(BSWAP4) && STRICT_ALIGNMENT == 1
- /* redefine, because alignment is ensured */
- #undef GETU32
- #define GETU32(p) BSWAP4(*(const uint32_t *)(p))
- #undef PUTU32
- #define PUTU32(p, v) *(uint32_t *)(p) = BSWAP4(v)
- #endif
-
- #define PACK(s) ((size_t)(s) << (sizeof(size_t) * 8 - 16))
- #define REDUCE1BIT(V) \
- do { \
- if (sizeof(size_t) == 8) { \
- uint64_t T = OPENSSL_U64(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)
- /* ARM assembler expects specific dword order in Htable. */
- {
- int j;
- const union {
- long one;
- char little;
- } is_endian = {1};
-
- if (is_endian.little) {
- for (j = 0; j < 16; ++j) {
- V = Htable[j];
- Htable[j].hi = V.lo;
- Htable[j].lo = V.hi;
- }
- } else {
- for (j = 0; j < 16; ++j) {
- V = Htable[j];
- Htable[j].hi = V.lo << 32 | V.lo >> 32;
- Htable[j].lo = V.hi << 32 | V.hi >> 32;
- }
- }
- }
- #endif
- }
-
- #if !defined(GHASH_ASM) || defined(OPENSSL_AARCH64)
- 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;
- const union {
- long one;
- char little;
- } is_endian = {1};
-
- 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;
- }
-
- if (is_endian.little) {
- #ifdef BSWAP8
- Xi[0] = BSWAP8(Z.hi);
- Xi[1] = BSWAP8(Z.lo);
- #else
- uint8_t *p = (uint8_t *)Xi;
- uint32_t v;
- v = (uint32_t)(Z.hi >> 32);
- PUTU32(p, v);
- v = (uint32_t)(Z.hi);
- PUTU32(p + 4, v);
- v = (uint32_t)(Z.lo >> 32);
- PUTU32(p + 8, v);
- v = (uint32_t)(Z.lo);
- PUTU32(p + 12, v);
- #endif
- } else {
- Xi[0] = Z.hi;
- Xi[1] = 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;
- const union {
- long one;
- char little;
- } is_endian = {1};
-
- 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;
- }
-
- if (is_endian.little) {
- #ifdef BSWAP8
- Xi[0] = BSWAP8(Z.hi);
- Xi[1] = BSWAP8(Z.lo);
- #else
- uint8_t *p = (uint8_t *)Xi;
- uint32_t v;
- v = (uint32_t)(Z.hi >> 32);
- PUTU32(p, v);
- v = (uint32_t)(Z.hi);
- PUTU32(p + 4, v);
- v = (uint32_t)(Z.lo >> 32);
- PUTU32(p + 8, v);
- v = (uint32_t)(Z.lo);
- PUTU32(p + 12, v);
- #endif
- } else {
- Xi[0] = Z.hi;
- Xi[1] = 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 GHASH_ASM_X86_OR_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)
- #define gcm_init_avx gcm_init_clmul
- #define gcm_gmult_avx gcm_gmult_clmul
- #define gcm_ghash_avx gcm_ghash_clmul
- #else
- 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 *inp, size_t len);
- #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);
-
- void gcm_gmult_4bit_x86(uint64_t Xi[2], const u128 Htable[16]);
- void gcm_ghash_4bit_x86(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp,
- size_t len);
- #endif
- #elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
- #include "../arm_arch.h"
- #if __ARM_ARCH__ >= 7
- #define GHASH_ASM_ARM
- #define GCM_FUNCREF_4BIT
-
- static int pmull_capable() {
- return (OPENSSL_armcap_P & ARMV8_PMULL) != 0;
- }
-
- 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);
-
- #if defined(OPENSSL_ARM)
- /* 32-bit ARM also has support for doing GCM with NEON instructions. */
- static int neon_capable() {
- 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() {
- return 0;
- }
- void gcm_init_neon(u128 Htable[16], const uint64_t Xi[2]) {
- abort();
- }
- void gcm_gmult_neon(uint64_t Xi[2], const u128 Htable[16]) {
- abort();
- }
- void gcm_ghash_neon(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp,
- size_t len) {
- abort();
- }
- #endif
-
- #endif
- #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
-
- GCM128_CONTEXT *CRYPTO_gcm128_new(void *key, block128_f block) {
- GCM128_CONTEXT *ret;
-
- ret = (GCM128_CONTEXT *)OPENSSL_malloc(sizeof(GCM128_CONTEXT));
- if (ret != NULL) {
- CRYPTO_gcm128_init(ret, key, block);
- }
-
- return ret;
- }
-
- void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx, void *key, block128_f block) {
- const union {
- long one;
- char little;
- } is_endian = {1};
-
- memset(ctx, 0, sizeof(*ctx));
- ctx->block = block;
- ctx->key = key;
-
- (*block)(ctx->H.c, ctx->H.c, key);
-
- if (is_endian.little) {
- /* H is stored in host byte order */
- #ifdef BSWAP8
- ctx->H.u[0] = BSWAP8(ctx->H.u[0]);
- ctx->H.u[1] = BSWAP8(ctx->H.u[1]);
- #else
- uint8_t *p = ctx->H.c;
- uint64_t hi, lo;
- hi = (uint64_t)GETU32(p) << 32 | GETU32(p + 4);
- lo = (uint64_t)GETU32(p + 8) << 32 | GETU32(p + 12);
- ctx->H.u[0] = hi;
- ctx->H.u[1] = lo;
- #endif
- }
-
- #if defined(GHASH_ASM_X86_OR_64)
- if (crypto_gcm_clmul_enabled()) {
- if (((OPENSSL_ia32cap_P[1] >> 22) & 0x41) == 0x41) { /* AVX+MOVBE */
- gcm_init_avx(ctx->Htable, ctx->H.u);
- ctx->gmult = gcm_gmult_avx;
- ctx->ghash = gcm_ghash_avx;
- } else {
- gcm_init_clmul(ctx->Htable, ctx->H.u);
- ctx->gmult = gcm_gmult_clmul;
- ctx->ghash = gcm_ghash_clmul;
- }
- return;
- }
- gcm_init_4bit(ctx->Htable, ctx->H.u);
- #if defined(GHASH_ASM_X86) /* x86 only */
- if (OPENSSL_ia32cap_P[0] & (1 << 25)) { /* check SSE bit */
- ctx->gmult = gcm_gmult_4bit_mmx;
- ctx->ghash = gcm_ghash_4bit_mmx;
- } else {
- ctx->gmult = gcm_gmult_4bit_x86;
- ctx->ghash = gcm_ghash_4bit_x86;
- }
- #else
- ctx->gmult = gcm_gmult_4bit;
- ctx->ghash = gcm_ghash_4bit;
- #endif
- #elif defined(GHASH_ASM_ARM)
- if (pmull_capable()) {
- gcm_init_v8(ctx->Htable, ctx->H.u);
- ctx->gmult = gcm_gmult_v8;
- ctx->ghash = gcm_ghash_v8;
- } else if (neon_capable()) {
- gcm_init_neon(ctx->Htable,ctx->H.u);
- ctx->gmult = gcm_gmult_neon;
- ctx->ghash = gcm_ghash_neon;
- } else {
- gcm_init_4bit(ctx->Htable, ctx->H.u);
- ctx->gmult = gcm_gmult_4bit;
- ctx->ghash = gcm_ghash_4bit;
- }
- #else
- gcm_init_4bit(ctx->Htable, ctx->H.u);
- ctx->gmult = gcm_gmult_4bit;
- ctx->ghash = gcm_ghash_4bit;
- #endif
- }
-
- void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx, const uint8_t *iv, size_t len) {
- const union {
- long one;
- char little;
- } is_endian = {1};
- 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) {
- memcpy(ctx->Yi.c, iv, 12);
- ctx->Yi.c[15] = 1;
- ctr = 1;
- } else {
- size_t i;
- uint64_t len0 = len;
-
- while (len >= 16) {
- for (i = 0; i < 16; ++i) {
- ctx->Yi.c[i] ^= iv[i];
- }
- GCM_MUL(ctx, Yi);
- iv += 16;
- len -= 16;
- }
- if (len) {
- for (i = 0; i < len; ++i) {
- ctx->Yi.c[i] ^= iv[i];
- }
- GCM_MUL(ctx, Yi);
- }
- len0 <<= 3;
- if (is_endian.little) {
- #ifdef BSWAP8
- ctx->Yi.u[1] ^= BSWAP8(len0);
- #else
- ctx->Yi.c[8] ^= (uint8_t)(len0 >> 56);
- ctx->Yi.c[9] ^= (uint8_t)(len0 >> 48);
- ctx->Yi.c[10] ^= (uint8_t)(len0 >> 40);
- ctx->Yi.c[11] ^= (uint8_t)(len0 >> 32);
- ctx->Yi.c[12] ^= (uint8_t)(len0 >> 24);
- ctx->Yi.c[13] ^= (uint8_t)(len0 >> 16);
- ctx->Yi.c[14] ^= (uint8_t)(len0 >> 8);
- ctx->Yi.c[15] ^= (uint8_t)(len0);
- #endif
- } else {
- ctx->Yi.u[1] ^= len0;
- }
-
- GCM_MUL(ctx, Yi);
-
- if (is_endian.little) {
- ctr = GETU32(ctx->Yi.c + 12);
- } else {
- ctr = ctx->Yi.d[3];
- }
- }
-
- (*ctx->block)(ctx->Yi.c, ctx->EK0.c, ctx->key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- }
-
- int CRYPTO_gcm128_aad(GCM128_CONTEXT *ctx, const uint8_t *aad, size_t len) {
- size_t i;
- 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 > (OPENSSL_U64(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;
- }
- }
-
- #ifdef GHASH
- if ((i = (len & (size_t) - 16))) {
- GHASH(ctx, aad, i);
- aad += i;
- len -= i;
- }
- #else
- while (len >= 16) {
- for (i = 0; i < 16; ++i) {
- ctx->Xi.c[i] ^= aad[i];
- }
- GCM_MUL(ctx, Xi);
- aad += 16;
- len -= 16;
- }
- #endif
- if (len) {
- n = (unsigned int)len;
- for (i = 0; i < len; ++i) {
- ctx->Xi.c[i] ^= aad[i];
- }
- }
-
- ctx->ares = n;
- return 1;
- }
-
- int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx, const unsigned char *in,
- unsigned char *out, size_t len) {
- const union {
- long one;
- char little;
- } is_endian = {1};
- unsigned int n, ctr;
- size_t i;
- uint64_t mlen = ctx->len.u[1];
- block128_f block = ctx->block;
- void *key = ctx->key;
- #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 > ((OPENSSL_U64(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;
- }
-
- if (is_endian.little) {
- ctr = GETU32(ctx->Yi.c + 12);
- } else {
- ctr = 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 && ((size_t)in | (size_t)out) % sizeof(size_t) != 0) {
- for (i = 0; i < len; ++i) {
- if (n == 0) {
- (*block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = 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) {
- size_t *out_t = (size_t *)out;
- const size_t *in_t = (const size_t *)in;
-
- (*block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- for (i = 0; i < 16 / sizeof(size_t); ++i) {
- out_t[i] = in_t[i] ^ ctx->EKi.t[i];
- }
- out += 16;
- in += 16;
- j -= 16;
- }
- GHASH(ctx, out - GHASH_CHUNK, GHASH_CHUNK);
- len -= GHASH_CHUNK;
- }
- if ((i = (len & (size_t) - 16))) {
- size_t j = i;
-
- while (len >= 16) {
- size_t *out_t = (size_t *)out;
- const size_t *in_t = (const size_t *)in;
-
- (*block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- for (i = 0; i < 16 / sizeof(size_t); ++i) {
- out_t[i] = in_t[i] ^ ctx->EKi.t[i];
- }
- out += 16;
- in += 16;
- len -= 16;
- }
- GHASH(ctx, out - j, j);
- }
- #else
- while (len >= 16) {
- size_t *out_t = (size_t *)out;
- const size_t *in_t = (const size_t *)in;
-
- (*block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- for (i = 0; i < 16 / sizeof(size_t); ++i) {
- ctx->Xi.t[i] ^= out_t[i] = in_t[i] ^ ctx->EKi.t[i];
- }
- GCM_MUL(ctx, Xi);
- out += 16;
- in += 16;
- len -= 16;
- }
- #endif
- if (len) {
- (*block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = 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 unsigned char *in,
- unsigned char *out, size_t len) {
- const union {
- long one;
- char little;
- } is_endian = {1};
- unsigned int n, ctr;
- size_t i;
- uint64_t mlen = ctx->len.u[1];
- block128_f block = ctx->block;
- void *key = ctx->key;
- #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 > ((OPENSSL_U64(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;
- }
-
- if (is_endian.little) {
- ctr = GETU32(ctx->Yi.c + 12);
- } else {
- ctr = 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 && ((size_t)in | (size_t)out) % sizeof(size_t) != 0) {
- for (i = 0; i < len; ++i) {
- uint8_t c;
- if (n == 0) {
- (*block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = 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) {
- size_t *out_t = (size_t *)out;
- const size_t *in_t = (const size_t *)in;
-
- (*block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- for (i = 0; i < 16 / sizeof(size_t); ++i) {
- out_t[i] = in_t[i] ^ ctx->EKi.t[i];
- }
- out += 16;
- in += 16;
- j -= 16;
- }
- len -= GHASH_CHUNK;
- }
- if ((i = (len & (size_t) - 16))) {
- GHASH(ctx, in, i);
- while (len >= 16) {
- size_t *out_t = (size_t *)out;
- const size_t *in_t = (const size_t *)in;
-
- (*block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- for (i = 0; i < 16 / sizeof(size_t); ++i) {
- out_t[i] = in_t[i] ^ ctx->EKi.t[i];
- }
- out += 16;
- in += 16;
- len -= 16;
- }
- }
- #else
- while (len >= 16) {
- size_t *out_t = (size_t *)out;
- const size_t *in_t = (const size_t *)in;
-
- (*block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- for (i = 0; i < 16 / sizeof(size_t); ++i) {
- size_t c = in_t[i];
- out_t[i] = c ^ ctx->EKi.t[i];
- ctx->Xi.t[i] ^= c;
- }
- GCM_MUL(ctx, Xi);
- out += 16;
- in += 16;
- len -= 16;
- }
- #endif
- if (len) {
- (*block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = 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_encrypt_ctr32(GCM128_CONTEXT *ctx, const uint8_t *in,
- uint8_t *out, size_t len, ctr128_f stream) {
- const union {
- long one;
- char little;
- } is_endian = {1};
- unsigned int n, ctr;
- size_t i;
- uint64_t mlen = ctx->len.u[1];
- void *key = ctx->key;
- #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 > ((OPENSSL_U64(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;
- }
-
- if (is_endian.little) {
- ctr = GETU32(ctx->Yi.c + 12);
- } else {
- ctr = 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 defined(GHASH)
- while (len >= GHASH_CHUNK) {
- (*stream)(in, out, GHASH_CHUNK / 16, key, ctx->Yi.c);
- ctr += GHASH_CHUNK / 16;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- GHASH(ctx, out, GHASH_CHUNK);
- out += GHASH_CHUNK;
- in += GHASH_CHUNK;
- len -= GHASH_CHUNK;
- }
- #endif
- if ((i = (len & (size_t) - 16))) {
- size_t j = i / 16;
-
- (*stream)(in, out, j, key, ctx->Yi.c);
- ctr += (unsigned int)j;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- in += i;
- len -= i;
- #if defined(GHASH)
- GHASH(ctx, out, i);
- out += i;
- #else
- while (j--) {
- for (i = 0; i < 16; ++i) {
- ctx->Xi.c[i] ^= out[i];
- }
- GCM_MUL(ctx, Xi);
- out += 16;
- }
- #endif
- }
- if (len) {
- (*ctx->block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = 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_ctr32(GCM128_CONTEXT *ctx, const uint8_t *in,
- uint8_t *out, size_t len,
- ctr128_f stream) {
- const union {
- long one;
- char little;
- } is_endian = {1};
- unsigned int n, ctr;
- size_t i;
- uint64_t mlen = ctx->len.u[1];
- void *key = ctx->key;
- #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 > ((OPENSSL_U64(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;
- }
-
- if (is_endian.little) {
- ctr = GETU32(ctx->Yi.c + 12);
- } else {
- ctr = 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 defined(GHASH)
- while (len >= GHASH_CHUNK) {
- GHASH(ctx, in, GHASH_CHUNK);
- (*stream)(in, out, GHASH_CHUNK / 16, key, ctx->Yi.c);
- ctr += GHASH_CHUNK / 16;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- out += GHASH_CHUNK;
- in += GHASH_CHUNK;
- len -= GHASH_CHUNK;
- }
- #endif
- if ((i = (len & (size_t) - 16))) {
- size_t j = i / 16;
-
- #if defined(GHASH)
- GHASH(ctx, in, i);
- #else
- while (j--) {
- size_t k;
- for (k = 0; k < 16; ++k) {
- ctx->Xi.c[k] ^= in[k];
- }
- GCM_MUL(ctx, Xi);
- in += 16;
- }
- j = i / 16;
- in -= i;
- #endif
- (*stream)(in, out, j, key, ctx->Yi.c);
- ctr += (unsigned int)j;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = ctr;
- }
- out += i;
- in += i;
- len -= i;
- }
- if (len) {
- (*ctx->block)(ctx->Yi.c, ctx->EKi.c, key);
- ++ctr;
- if (is_endian.little) {
- PUTU32(ctx->Yi.c + 12, ctr);
- } else {
- ctx->Yi.d[3] = 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) {
- const union {
- long one;
- char little;
- } is_endian = {1};
- 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);
- }
-
- if (is_endian.little) {
- #ifdef BSWAP8
- alen = BSWAP8(alen);
- clen = BSWAP8(clen);
- #else
- uint8_t *p = ctx->len.c;
-
- ctx->len.u[0] = alen;
- ctx->len.u[1] = clen;
-
- alen = (uint64_t)GETU32(p) << 32 | GETU32(p + 4);
- clen = (uint64_t)GETU32(p + 8) << 32 | GETU32(p + 12);
- #endif
- }
-
- 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);
- memcpy(tag, ctx->Xi.c, len <= sizeof(ctx->Xi.c) ? len : sizeof(ctx->Xi.c));
- }
-
- void CRYPTO_gcm128_release(GCM128_CONTEXT *ctx) {
- if (ctx) {
- OPENSSL_cleanse(ctx, sizeof(*ctx));
- OPENSSL_free(ctx);
- }
- }
-
- #if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
- int crypto_gcm_clmul_enabled(void) {
- #ifdef GHASH_ASM
- return OPENSSL_ia32cap_P[0] & (1 << 24) && /* check FXSR bit */
- OPENSSL_ia32cap_P[1] & (1 << 1); /* check PCLMULQDQ bit */
- #else
- return 0;
- #endif
- }
- #endif
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