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Diffstat (limited to 'src/crypto/modes/gcm.c')
| -rw-r--r-- | src/crypto/modes/gcm.c | 1245 |
1 files changed, 1245 insertions, 0 deletions
diff --git a/src/crypto/modes/gcm.c b/src/crypto/modes/gcm.c new file mode 100644 index 0000000..eeaeeff --- /dev/null +++ b/src/crypto/modes/gcm.c @@ -0,0 +1,1245 @@ +/* ==================================================================== + * 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 |