diff options
Diffstat (limited to 'crypto/libressl/crypto/modes/gcm128.c')
-rw-r--r-- | crypto/libressl/crypto/modes/gcm128.c | 1566 |
1 files changed, 1566 insertions, 0 deletions
diff --git a/crypto/libressl/crypto/modes/gcm128.c b/crypto/libressl/crypto/modes/gcm128.c new file mode 100644 index 0000000..d6c1bbe --- /dev/null +++ b/crypto/libressl/crypto/modes/gcm128.c @@ -0,0 +1,1566 @@ +/* $OpenBSD: gcm128.c,v 1.22 2018/01/24 23:03:37 kettenis Exp $ */ +/* ==================================================================== + * Copyright (c) 2010 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. + * ==================================================================== + */ + +#define OPENSSL_FIPSAPI + +#include <openssl/crypto.h> +#include "modes_lcl.h" +#include <string.h> + +#ifndef MODES_DEBUG +# ifndef NDEBUG +# define NDEBUG +# endif +#endif + +#if defined(BSWAP4) && defined(__STRICT_ALIGNMENT) +/* redefine, because alignment is ensured */ +#undef GETU32 +#define GETU32(p) BSWAP4(*(const u32 *)(p)) +#undef PUTU32 +#define PUTU32(p,v) *(u32 *)(p) = BSWAP4(v) +#endif + +#define PACK(s) ((size_t)(s)<<(sizeof(size_t)*8-16)) +#define REDUCE1BIT(V) \ + do { \ + if (sizeof(size_t)==8) { \ + u64 T = U64(0xe100000000000000) & (0-(V.lo&1)); \ + V.lo = (V.hi<<63)|(V.lo>>1); \ + V.hi = (V.hi>>1 )^T; \ + } else { \ + u32 T = 0xe1000000U & (0-(u32)(V.lo&1)); \ + V.lo = (V.hi<<63)|(V.lo>>1); \ + V.hi = (V.hi>>1 )^((u64)T<<32); \ + } \ + } while(0) + +/* + * Even though permitted values for TABLE_BITS are 8, 4 and 1, it should + * never be set to 8. 8 is effectively reserved for testing purposes. + * TABLE_BITS>1 are lookup-table-driven implementations referred to as + * "Shoup's" in GCM specification. In other words OpenSSL does not cover + * whole spectrum of possible table driven implementations. Why? In + * non-"Shoup's" case memory access pattern is segmented in such manner, + * that it's trivial to see that cache timing information can reveal + * fair portion of intermediate hash value. Given that ciphertext is + * always available to attacker, it's possible for him to attempt to + * deduce secret parameter H and if successful, tamper with messages + * [which is nothing but trivial in CTR mode]. In "Shoup's" case it's + * not as trivial, but there is no reason to believe that it's resistant + * to cache-timing attack. And the thing about "8-bit" implementation is + * that it consumes 16 (sixteen) times more memory, 4KB per individual + * key + 1KB shared. Well, on pros side it should be twice as fast as + * "4-bit" version. And for gcc-generated x86[_64] code, "8-bit" version + * was observed to run ~75% faster, closer to 100% for commercial + * compilers... Yet "4-bit" procedure is preferred, because it's + * believed to provide better security-performance balance and adequate + * all-round performance. "All-round" refers to things like: + * + * - shorter setup time effectively improves overall timing for + * handling short messages; + * - larger table allocation can become unbearable because of VM + * subsystem penalties (for example on Windows large enough free + * results in VM working set trimming, meaning that consequent + * malloc would immediately incur working set expansion); + * - larger table has larger cache footprint, which can affect + * performance of other code paths (not necessarily even from same + * thread in Hyper-Threading world); + * + * Value of 1 is not appropriate for performance reasons. + */ +#if TABLE_BITS==8 + +static void gcm_init_8bit(u128 Htable[256], u64 H[2]) +{ + int i, j; + u128 V; + + Htable[0].hi = 0; + Htable[0].lo = 0; + V.hi = H[0]; + V.lo = H[1]; + + for (Htable[128]=V, i=64; i>0; i>>=1) { + REDUCE1BIT(V); + Htable[i] = V; + } + + for (i=2; i<256; i<<=1) { + u128 *Hi = Htable+i, H0 = *Hi; + for (j=1; j<i; ++j) { + Hi[j].hi = H0.hi^Htable[j].hi; + Hi[j].lo = H0.lo^Htable[j].lo; + } + } +} + +static void gcm_gmult_8bit(u64 Xi[2], const u128 Htable[256]) +{ + u128 Z = { 0, 0}; + const u8 *xi = (const u8 *)Xi+15; + size_t rem, n = *xi; + static const size_t rem_8bit[256] = { + PACK(0x0000), PACK(0x01C2), PACK(0x0384), PACK(0x0246), + PACK(0x0708), PACK(0x06CA), PACK(0x048C), PACK(0x054E), + PACK(0x0E10), PACK(0x0FD2), PACK(0x0D94), PACK(0x0C56), + PACK(0x0918), PACK(0x08DA), PACK(0x0A9C), PACK(0x0B5E), + PACK(0x1C20), PACK(0x1DE2), PACK(0x1FA4), PACK(0x1E66), + PACK(0x1B28), PACK(0x1AEA), PACK(0x18AC), PACK(0x196E), + PACK(0x1230), PACK(0x13F2), PACK(0x11B4), PACK(0x1076), + PACK(0x1538), PACK(0x14FA), PACK(0x16BC), PACK(0x177E), + PACK(0x3840), PACK(0x3982), PACK(0x3BC4), PACK(0x3A06), + PACK(0x3F48), PACK(0x3E8A), PACK(0x3CCC), PACK(0x3D0E), + PACK(0x3650), PACK(0x3792), PACK(0x35D4), PACK(0x3416), + PACK(0x3158), PACK(0x309A), PACK(0x32DC), PACK(0x331E), + PACK(0x2460), PACK(0x25A2), PACK(0x27E4), PACK(0x2626), + PACK(0x2368), PACK(0x22AA), PACK(0x20EC), PACK(0x212E), + PACK(0x2A70), PACK(0x2BB2), PACK(0x29F4), PACK(0x2836), + PACK(0x2D78), PACK(0x2CBA), PACK(0x2EFC), PACK(0x2F3E), + PACK(0x7080), PACK(0x7142), PACK(0x7304), PACK(0x72C6), + PACK(0x7788), PACK(0x764A), PACK(0x740C), PACK(0x75CE), + PACK(0x7E90), PACK(0x7F52), PACK(0x7D14), PACK(0x7CD6), + PACK(0x7998), PACK(0x785A), PACK(0x7A1C), PACK(0x7BDE), + PACK(0x6CA0), PACK(0x6D62), PACK(0x6F24), PACK(0x6EE6), + PACK(0x6BA8), PACK(0x6A6A), PACK(0x682C), PACK(0x69EE), + PACK(0x62B0), PACK(0x6372), PACK(0x6134), PACK(0x60F6), + PACK(0x65B8), PACK(0x647A), PACK(0x663C), PACK(0x67FE), + PACK(0x48C0), PACK(0x4902), PACK(0x4B44), PACK(0x4A86), + PACK(0x4FC8), PACK(0x4E0A), PACK(0x4C4C), PACK(0x4D8E), + PACK(0x46D0), PACK(0x4712), PACK(0x4554), PACK(0x4496), + PACK(0x41D8), PACK(0x401A), PACK(0x425C), PACK(0x439E), + PACK(0x54E0), PACK(0x5522), PACK(0x5764), PACK(0x56A6), + PACK(0x53E8), PACK(0x522A), PACK(0x506C), PACK(0x51AE), + PACK(0x5AF0), PACK(0x5B32), PACK(0x5974), PACK(0x58B6), + PACK(0x5DF8), PACK(0x5C3A), PACK(0x5E7C), PACK(0x5FBE), + PACK(0xE100), PACK(0xE0C2), PACK(0xE284), PACK(0xE346), + PACK(0xE608), PACK(0xE7CA), PACK(0xE58C), PACK(0xE44E), + PACK(0xEF10), PACK(0xEED2), PACK(0xEC94), PACK(0xED56), + PACK(0xE818), PACK(0xE9DA), PACK(0xEB9C), PACK(0xEA5E), + PACK(0xFD20), PACK(0xFCE2), PACK(0xFEA4), PACK(0xFF66), + PACK(0xFA28), PACK(0xFBEA), PACK(0xF9AC), PACK(0xF86E), + PACK(0xF330), PACK(0xF2F2), PACK(0xF0B4), PACK(0xF176), + PACK(0xF438), PACK(0xF5FA), PACK(0xF7BC), PACK(0xF67E), + PACK(0xD940), PACK(0xD882), PACK(0xDAC4), PACK(0xDB06), + PACK(0xDE48), PACK(0xDF8A), PACK(0xDDCC), PACK(0xDC0E), + PACK(0xD750), PACK(0xD692), PACK(0xD4D4), PACK(0xD516), + PACK(0xD058), PACK(0xD19A), PACK(0xD3DC), PACK(0xD21E), + PACK(0xC560), PACK(0xC4A2), PACK(0xC6E4), PACK(0xC726), + PACK(0xC268), PACK(0xC3AA), PACK(0xC1EC), PACK(0xC02E), + PACK(0xCB70), PACK(0xCAB2), PACK(0xC8F4), PACK(0xC936), + PACK(0xCC78), PACK(0xCDBA), PACK(0xCFFC), PACK(0xCE3E), + PACK(0x9180), PACK(0x9042), PACK(0x9204), PACK(0x93C6), + PACK(0x9688), PACK(0x974A), PACK(0x950C), PACK(0x94CE), + PACK(0x9F90), PACK(0x9E52), PACK(0x9C14), PACK(0x9DD6), + PACK(0x9898), PACK(0x995A), PACK(0x9B1C), PACK(0x9ADE), + PACK(0x8DA0), PACK(0x8C62), PACK(0x8E24), PACK(0x8FE6), + PACK(0x8AA8), PACK(0x8B6A), PACK(0x892C), PACK(0x88EE), + PACK(0x83B0), PACK(0x8272), PACK(0x8034), PACK(0x81F6), + PACK(0x84B8), PACK(0x857A), PACK(0x873C), PACK(0x86FE), + PACK(0xA9C0), PACK(0xA802), PACK(0xAA44), PACK(0xAB86), + PACK(0xAEC8), PACK(0xAF0A), PACK(0xAD4C), PACK(0xAC8E), + PACK(0xA7D0), PACK(0xA612), PACK(0xA454), PACK(0xA596), + PACK(0xA0D8), PACK(0xA11A), PACK(0xA35C), PACK(0xA29E), + PACK(0xB5E0), PACK(0xB422), PACK(0xB664), PACK(0xB7A6), + PACK(0xB2E8), PACK(0xB32A), PACK(0xB16C), PACK(0xB0AE), + PACK(0xBBF0), PACK(0xBA32), PACK(0xB874), PACK(0xB9B6), + PACK(0xBCF8), PACK(0xBD3A), PACK(0xBF7C), PACK(0xBEBE) }; + + while (1) { + Z.hi ^= Htable[n].hi; + Z.lo ^= Htable[n].lo; + + if ((u8 *)Xi==xi) break; + + n = *(--xi); + + rem = (size_t)Z.lo&0xff; + Z.lo = (Z.hi<<56)|(Z.lo>>8); + Z.hi = (Z.hi>>8); +#if SIZE_MAX == 0xffffffffffffffff + Z.hi ^= rem_8bit[rem]; +#else + Z.hi ^= (u64)rem_8bit[rem]<<32; +#endif + } + +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP8 + Xi[0] = BSWAP8(Z.hi); + Xi[1] = BSWAP8(Z.lo); +#else + u8 *p = (u8 *)Xi; + u32 v; + v = (u32)(Z.hi>>32); PUTU32(p,v); + v = (u32)(Z.hi); PUTU32(p+4,v); + v = (u32)(Z.lo>>32); PUTU32(p+8,v); + v = (u32)(Z.lo); PUTU32(p+12,v); +#endif +#else /* BIG_ENDIAN */ + Xi[0] = Z.hi; + Xi[1] = Z.lo; +#endif +} +#define GCM_MUL(ctx,Xi) gcm_gmult_8bit(ctx->Xi.u,ctx->Htable) + +#elif TABLE_BITS==4 + +static void gcm_init_4bit(u128 Htable[16], u64 H[2]) +{ + u128 V; +#if defined(OPENSSL_SMALL_FOOTPRINT) + int i; +#endif + + Htable[0].hi = 0; + Htable[0].lo = 0; + V.hi = H[0]; + V.lo = H[1]; + +#if defined(OPENSSL_SMALL_FOOTPRINT) + for (Htable[8]=V, i=4; i>0; i>>=1) { + REDUCE1BIT(V); + Htable[i] = V; + } + + for (i=2; i<16; i<<=1) { + u128 *Hi = Htable+i; + int j; + for (V=*Hi, j=1; j<i; ++j) { + Hi[j].hi = V.hi^Htable[j].hi; + Hi[j].lo = V.lo^Htable[j].lo; + } + } +#else + 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; +#endif +#if defined(GHASH_ASM) && (defined(__arm__) || defined(__arm)) + /* + * ARM assembler expects specific dword order in Htable. + */ + { + int j; +#if BYTE_ORDER == LITTLE_ENDIAN + for (j=0;j<16;++j) { + V = Htable[j]; + Htable[j].hi = V.lo; + Htable[j].lo = V.hi; + } +#else /* BIG_ENDIAN */ + 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 + } +#endif +} + +#ifndef GHASH_ASM +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(u64 Xi[2], const u128 Htable[16]) +{ + u128 Z; + int cnt = 15; + size_t rem, nlo, nhi; + + nlo = ((const u8 *)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 SIZE_MAX == 0xffffffffffffffff + Z.hi ^= rem_4bit[rem]; +#else + Z.hi ^= (u64)rem_4bit[rem]<<32; +#endif + Z.hi ^= Htable[nhi].hi; + Z.lo ^= Htable[nhi].lo; + + if (--cnt<0) break; + + nlo = ((const u8 *)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 SIZE_MAX == 0xffffffffffffffff + Z.hi ^= rem_4bit[rem]; +#else + Z.hi ^= (u64)rem_4bit[rem]<<32; +#endif + Z.hi ^= Htable[nlo].hi; + Z.lo ^= Htable[nlo].lo; + } + +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP8 + Xi[0] = BSWAP8(Z.hi); + Xi[1] = BSWAP8(Z.lo); +#else + u8 *p = (u8 *)Xi; + u32 v; + v = (u32)(Z.hi>>32); PUTU32(p,v); + v = (u32)(Z.hi); PUTU32(p+4,v); + v = (u32)(Z.lo>>32); PUTU32(p+8,v); + v = (u32)(Z.lo); PUTU32(p+12,v); +#endif +#else /* BIG_ENDIAN */ + Xi[0] = Z.hi; + Xi[1] = Z.lo; +#endif +} + +#if !defined(OPENSSL_SMALL_FOOTPRINT) +/* + * 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(u64 Xi[2],const u128 Htable[16], + const u8 *inp,size_t len) +{ + u128 Z; + int cnt; + size_t rem, nlo, nhi; + +#if 1 + do { + cnt = 15; + nlo = ((const u8 *)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 SIZE_MAX == 0xffffffffffffffff + Z.hi ^= rem_4bit[rem]; +#else + Z.hi ^= (u64)rem_4bit[rem]<<32; +#endif + Z.hi ^= Htable[nhi].hi; + Z.lo ^= Htable[nhi].lo; + + if (--cnt<0) break; + + nlo = ((const u8 *)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 SIZE_MAX == 0xffffffffffffffff + Z.hi ^= rem_4bit[rem]; +#else + Z.hi ^= (u64)rem_4bit[rem]<<32; +#endif + Z.hi ^= Htable[nlo].hi; + Z.lo ^= Htable[nlo].lo; + } +#else + /* + * Extra 256+16 bytes per-key plus 512 bytes shared tables + * [should] give ~50% improvement... One could have PACK()-ed + * the rem_8bit even here, but the priority is to minimize + * cache footprint... + */ + u128 Hshr4[16]; /* Htable shifted right by 4 bits */ + u8 Hshl4[16]; /* Htable shifted left by 4 bits */ + static const unsigned short rem_8bit[256] = { + 0x0000, 0x01C2, 0x0384, 0x0246, 0x0708, 0x06CA, 0x048C, 0x054E, + 0x0E10, 0x0FD2, 0x0D94, 0x0C56, 0x0918, 0x08DA, 0x0A9C, 0x0B5E, + 0x1C20, 0x1DE2, 0x1FA4, 0x1E66, 0x1B28, 0x1AEA, 0x18AC, 0x196E, + 0x1230, 0x13F2, 0x11B4, 0x1076, 0x1538, 0x14FA, 0x16BC, 0x177E, + 0x3840, 0x3982, 0x3BC4, 0x3A06, 0x3F48, 0x3E8A, 0x3CCC, 0x3D0E, + 0x3650, 0x3792, 0x35D4, 0x3416, 0x3158, 0x309A, 0x32DC, 0x331E, + 0x2460, 0x25A2, 0x27E4, 0x2626, 0x2368, 0x22AA, 0x20EC, 0x212E, + 0x2A70, 0x2BB2, 0x29F4, 0x2836, 0x2D78, 0x2CBA, 0x2EFC, 0x2F3E, + 0x7080, 0x7142, 0x7304, 0x72C6, 0x7788, 0x764A, 0x740C, 0x75CE, + 0x7E90, 0x7F52, 0x7D14, 0x7CD6, 0x7998, 0x785A, 0x7A1C, 0x7BDE, + 0x6CA0, 0x6D62, 0x6F24, 0x6EE6, 0x6BA8, 0x6A6A, 0x682C, 0x69EE, + 0x62B0, 0x6372, 0x6134, 0x60F6, 0x65B8, 0x647A, 0x663C, 0x67FE, + 0x48C0, 0x4902, 0x4B44, 0x4A86, 0x4FC8, 0x4E0A, 0x4C4C, 0x4D8E, + 0x46D0, 0x4712, 0x4554, 0x4496, 0x41D8, 0x401A, 0x425C, 0x439E, + 0x54E0, 0x5522, 0x5764, 0x56A6, 0x53E8, 0x522A, 0x506C, 0x51AE, + 0x5AF0, 0x5B32, 0x5974, 0x58B6, 0x5DF8, 0x5C3A, 0x5E7C, 0x5FBE, + 0xE100, 0xE0C2, 0xE284, 0xE346, 0xE608, 0xE7CA, 0xE58C, 0xE44E, + 0xEF10, 0xEED2, 0xEC94, 0xED56, 0xE818, 0xE9DA, 0xEB9C, 0xEA5E, + 0xFD20, 0xFCE2, 0xFEA4, 0xFF66, 0xFA28, 0xFBEA, 0xF9AC, 0xF86E, + 0xF330, 0xF2F2, 0xF0B4, 0xF176, 0xF438, 0xF5FA, 0xF7BC, 0xF67E, + 0xD940, 0xD882, 0xDAC4, 0xDB06, 0xDE48, 0xDF8A, 0xDDCC, 0xDC0E, + 0xD750, 0xD692, 0xD4D4, 0xD516, 0xD058, 0xD19A, 0xD3DC, 0xD21E, + 0xC560, 0xC4A2, 0xC6E4, 0xC726, 0xC268, 0xC3AA, 0xC1EC, 0xC02E, + 0xCB70, 0xCAB2, 0xC8F4, 0xC936, 0xCC78, 0xCDBA, 0xCFFC, 0xCE3E, + 0x9180, 0x9042, 0x9204, 0x93C6, 0x9688, 0x974A, 0x950C, 0x94CE, + 0x9F90, 0x9E52, 0x9C14, 0x9DD6, 0x9898, 0x995A, 0x9B1C, 0x9ADE, + 0x8DA0, 0x8C62, 0x8E24, 0x8FE6, 0x8AA8, 0x8B6A, 0x892C, 0x88EE, + 0x83B0, 0x8272, 0x8034, 0x81F6, 0x84B8, 0x857A, 0x873C, 0x86FE, + 0xA9C0, 0xA802, 0xAA44, 0xAB86, 0xAEC8, 0xAF0A, 0xAD4C, 0xAC8E, + 0xA7D0, 0xA612, 0xA454, 0xA596, 0xA0D8, 0xA11A, 0xA35C, 0xA29E, + 0xB5E0, 0xB422, 0xB664, 0xB7A6, 0xB2E8, 0xB32A, 0xB16C, 0xB0AE, + 0xBBF0, 0xBA32, 0xB874, 0xB9B6, 0xBCF8, 0xBD3A, 0xBF7C, 0xBEBE }; + /* + * This pre-processing phase slows down procedure by approximately + * same time as it makes each loop spin faster. In other words + * single block performance is approximately same as straightforward + * "4-bit" implementation, and then it goes only faster... + */ + for (cnt=0; cnt<16; ++cnt) { + Z.hi = Htable[cnt].hi; + Z.lo = Htable[cnt].lo; + Hshr4[cnt].lo = (Z.hi<<60)|(Z.lo>>4); + Hshr4[cnt].hi = (Z.hi>>4); + Hshl4[cnt] = (u8)(Z.lo<<4); + } + + do { + for (Z.lo=0, Z.hi=0, cnt=15; cnt; --cnt) { + nlo = ((const u8 *)Xi)[cnt]; + nlo ^= inp[cnt]; + nhi = nlo>>4; + nlo &= 0xf; + + Z.hi ^= Htable[nlo].hi; + Z.lo ^= Htable[nlo].lo; + + rem = (size_t)Z.lo&0xff; + + Z.lo = (Z.hi<<56)|(Z.lo>>8); + Z.hi = (Z.hi>>8); + + Z.hi ^= Hshr4[nhi].hi; + Z.lo ^= Hshr4[nhi].lo; + Z.hi ^= (u64)rem_8bit[rem^Hshl4[nhi]]<<48; + } + + nlo = ((const u8 *)Xi)[0]; + nlo ^= inp[0]; + nhi = nlo>>4; + nlo &= 0xf; + + Z.hi ^= Htable[nlo].hi; + Z.lo ^= Htable[nlo].lo; + + rem = (size_t)Z.lo&0xf; + + Z.lo = (Z.hi<<60)|(Z.lo>>4); + Z.hi = (Z.hi>>4); + + Z.hi ^= Htable[nhi].hi; + Z.lo ^= Htable[nhi].lo; + Z.hi ^= ((u64)rem_8bit[rem<<4])<<48; +#endif + +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP8 + Xi[0] = BSWAP8(Z.hi); + Xi[1] = BSWAP8(Z.lo); +#else + u8 *p = (u8 *)Xi; + u32 v; + v = (u32)(Z.hi>>32); PUTU32(p,v); + v = (u32)(Z.hi); PUTU32(p+4,v); + v = (u32)(Z.lo>>32); PUTU32(p+8,v); + v = (u32)(Z.lo); PUTU32(p+12,v); +#endif +#else /* BIG_ENDIAN */ + Xi[0] = Z.hi; + Xi[1] = Z.lo; +#endif + } while (inp+=16, len-=16); +} +#endif +#else +void gcm_gmult_4bit(u64 Xi[2],const u128 Htable[16]); +void gcm_ghash_4bit(u64 Xi[2],const u128 Htable[16],const u8 *inp,size_t len); +#endif + +#define GCM_MUL(ctx,Xi) gcm_gmult_4bit(ctx->Xi.u,ctx->Htable) +#if defined(GHASH_ASM) || !defined(OPENSSL_SMALL_FOOTPRINT) +#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 + +#else /* TABLE_BITS */ + +static void gcm_gmult_1bit(u64 Xi[2],const u64 H[2]) +{ + u128 V,Z = { 0,0 }; + long X; + int i,j; + const long *xi = (const long *)Xi; + + V.hi = H[0]; /* H is in host byte order, no byte swapping */ + V.lo = H[1]; + + for (j=0; j<16/sizeof(long); ++j) { +#if BYTE_ORDER == LITTLE_ENDIAN +#if SIZE_MAX == 0xffffffffffffffff +#ifdef BSWAP8 + X = (long)(BSWAP8(xi[j])); +#else + const u8 *p = (const u8 *)(xi+j); + X = (long)((u64)GETU32(p)<<32|GETU32(p+4)); +#endif +#else + const u8 *p = (const u8 *)(xi+j); + X = (long)GETU32(p); +#endif +#else /* BIG_ENDIAN */ + X = xi[j]; +#endif + + for (i=0; i<8*sizeof(long); ++i, X<<=1) { + u64 M = (u64)(X>>(8*sizeof(long)-1)); + Z.hi ^= V.hi&M; + Z.lo ^= V.lo&M; + + REDUCE1BIT(V); + } + } + +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP8 + Xi[0] = BSWAP8(Z.hi); + Xi[1] = BSWAP8(Z.lo); +#else + u8 *p = (u8 *)Xi; + u32 v; + v = (u32)(Z.hi>>32); PUTU32(p,v); + v = (u32)(Z.hi); PUTU32(p+4,v); + v = (u32)(Z.lo>>32); PUTU32(p+8,v); + v = (u32)(Z.lo); PUTU32(p+12,v); +#endif +#else /* BIG_ENDIAN */ + Xi[0] = Z.hi; + Xi[1] = Z.lo; +#endif +} +#define GCM_MUL(ctx,Xi) gcm_gmult_1bit(ctx->Xi.u,ctx->H.u) + +#endif + +#if defined(GHASH_ASM) && \ + (defined(__i386) || defined(__i386__) || \ + defined(__x86_64) || defined(__x86_64__) || \ + defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64)) +#include "x86_arch.h" +#endif + +#if TABLE_BITS==4 && defined(GHASH_ASM) +# if (defined(__i386) || defined(__i386__) || \ + defined(__x86_64) || defined(__x86_64__) || \ + defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64)) +# define GHASH_ASM_X86_OR_64 +# define GCM_FUNCREF_4BIT + +void gcm_init_clmul(u128 Htable[16],const u64 Xi[2]); +void gcm_gmult_clmul(u64 Xi[2],const u128 Htable[16]); +void gcm_ghash_clmul(u64 Xi[2],const u128 Htable[16],const u8 *inp,size_t len); + +# if defined(__i386) || defined(__i386__) || defined(_M_IX86) +# define GHASH_ASM_X86 +void gcm_gmult_4bit_mmx(u64 Xi[2],const u128 Htable[16]); +void gcm_ghash_4bit_mmx(u64 Xi[2],const u128 Htable[16],const u8 *inp,size_t len); + +void gcm_gmult_4bit_x86(u64 Xi[2],const u128 Htable[16]); +void gcm_ghash_4bit_x86(u64 Xi[2],const u128 Htable[16],const u8 *inp,size_t len); +# endif +# elif defined(__arm__) || defined(__arm) +# include "arm_arch.h" +# if __ARM_ARCH__>=7 && !defined(__STRICT_ALIGNMENT) +# define GHASH_ASM_ARM +# define GCM_FUNCREF_4BIT +void gcm_gmult_neon(u64 Xi[2],const u128 Htable[16]); +void gcm_ghash_neon(u64 Xi[2],const u128 Htable[16],const u8 *inp,size_t len); +# 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 + +void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx,void *key,block128_f block) +{ + memset(ctx,0,sizeof(*ctx)); + ctx->block = block; + ctx->key = key; + + (*block)(ctx->H.c,ctx->H.c,key); + +#if BYTE_ORDER == LITTLE_ENDIAN + /* 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 + u8 *p = ctx->H.c; + u64 hi,lo; + hi = (u64)GETU32(p) <<32|GETU32(p+4); + lo = (u64)GETU32(p+8)<<32|GETU32(p+12); + ctx->H.u[0] = hi; + ctx->H.u[1] = lo; +#endif +#endif + +#if TABLE_BITS==8 + gcm_init_8bit(ctx->Htable,ctx->H.u); +#elif TABLE_BITS==4 +# if defined(GHASH_ASM_X86_OR_64) +# if !defined(GHASH_ASM_X86) || defined(OPENSSL_IA32_SSE2) + /* check FXSR and PCLMULQDQ bits */ + if ((OPENSSL_cpu_caps() & (CPUCAP_MASK_FXSR | CPUCAP_MASK_PCLMUL)) == + (CPUCAP_MASK_FXSR | CPUCAP_MASK_PCLMUL)) { + gcm_init_clmul(ctx->Htable,ctx->H.u); + ctx->gmult = gcm_gmult_clmul; + ctx->ghash = gcm_ghash_clmul; + return; + } +# endif + gcm_init_4bit(ctx->Htable,ctx->H.u); +# if defined(GHASH_ASM_X86) /* x86 only */ +# if defined(OPENSSL_IA32_SSE2) + if (OPENSSL_cpu_caps() & CPUCAP_MASK_SSE) { /* check SSE bit */ +# else + if (OPENSSL_cpu_caps() & CPUCAP_MASK_MMX) { /* check MMX bit */ +# endif + 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 (OPENSSL_armcap_P & ARMV7_NEON) { + 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); +# endif +#endif +} + +void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx,const unsigned char *iv,size_t len) +{ + unsigned int ctr; +#ifdef GCM_FUNCREF_4BIT + void (*gcm_gmult_p)(u64 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; + u64 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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP8 + ctx->Yi.u[1] ^= BSWAP8(len0); +#else + ctx->Yi.c[8] ^= (u8)(len0>>56); + ctx->Yi.c[9] ^= (u8)(len0>>48); + ctx->Yi.c[10] ^= (u8)(len0>>40); + ctx->Yi.c[11] ^= (u8)(len0>>32); + ctx->Yi.c[12] ^= (u8)(len0>>24); + ctx->Yi.c[13] ^= (u8)(len0>>16); + ctx->Yi.c[14] ^= (u8)(len0>>8); + ctx->Yi.c[15] ^= (u8)(len0); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.u[1] ^= len0; +#endif + + GCM_MUL(ctx,Yi); + +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctr = BSWAP4(ctx->Yi.d[3]); +#else + ctr = GETU32(ctx->Yi.c+12); +#endif +#else /* BIG_ENDIAN */ + ctr = ctx->Yi.d[3]; +#endif + } + + (*ctx->block)(ctx->Yi.c,ctx->EK0.c,ctx->key); + ++ctr; +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif +} + +int CRYPTO_gcm128_aad(GCM128_CONTEXT *ctx,const unsigned char *aad,size_t len) +{ + size_t i; + unsigned int n; + u64 alen = ctx->len.u[0]; +#ifdef GCM_FUNCREF_4BIT + void (*gcm_gmult_p)(u64 Xi[2],const u128 Htable[16]) = ctx->gmult; +# ifdef GHASH + void (*gcm_ghash_p)(u64 Xi[2],const u128 Htable[16], + const u8 *inp,size_t len) = ctx->ghash; +# endif +#endif + + if (ctx->len.u[1]) return -2; + + alen += len; + if (alen>(U64(1)<<61) || (sizeof(len)==8 && alen<len)) + return -1; + 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 0; + } + } + +#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 0; +} + +int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx, + const unsigned char *in, unsigned char *out, + size_t len) +{ + unsigned int n, ctr; + size_t i; + u64 mlen = ctx->len.u[1]; + block128_f block = ctx->block; + void *key = ctx->key; +#ifdef GCM_FUNCREF_4BIT + void (*gcm_gmult_p)(u64 Xi[2],const u128 Htable[16]) = ctx->gmult; +# ifdef GHASH + void (*gcm_ghash_p)(u64 Xi[2],const u128 Htable[16], + const u8 *inp,size_t len) = ctx->ghash; +# endif +#endif + + mlen += len; + if (mlen>((U64(1)<<36)-32) || (sizeof(len)==8 && mlen<len)) + return -1; + ctx->len.u[1] = mlen; + + if (ctx->ares) { + /* First call to encrypt finalizes GHASH(AAD) */ + GCM_MUL(ctx,Xi); + ctx->ares = 0; + } + +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctr = BSWAP4(ctx->Yi.d[3]); +#else + ctr = GETU32(ctx->Yi.c+12); +#endif +#else /* BIG_ENDIAN */ + ctr = ctx->Yi.d[3]; +#endif + + n = ctx->mres; +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (16%sizeof(size_t) == 0) do { /* always true actually */ + 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 0; + } + } +#ifdef __STRICT_ALIGNMENT + if (((size_t)in|(size_t)out)%sizeof(size_t) != 0) + break; +#endif +#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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + 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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + 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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + 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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + while (len--) { + ctx->Xi.c[n] ^= out[n] = in[n]^ctx->EKi.c[n]; + ++n; + } + } + + ctx->mres = n; + return 0; + } while(0); +#endif + for (i=0;i<len;++i) { + if (n==0) { + (*block)(ctx->Yi.c,ctx->EKi.c,key); + ++ctr; +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + } + 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 0; +} + +int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx, + const unsigned char *in, unsigned char *out, + size_t len) +{ + unsigned int n, ctr; + size_t i; + u64 mlen = ctx->len.u[1]; + block128_f block = ctx->block; + void *key = ctx->key; +#ifdef GCM_FUNCREF_4BIT + void (*gcm_gmult_p)(u64 Xi[2],const u128 Htable[16]) = ctx->gmult; +# ifdef GHASH + void (*gcm_ghash_p)(u64 Xi[2],const u128 Htable[16], + const u8 *inp,size_t len) = ctx->ghash; +# endif +#endif + + mlen += len; + if (mlen>((U64(1)<<36)-32) || (sizeof(len)==8 && mlen<len)) + return -1; + ctx->len.u[1] = mlen; + + if (ctx->ares) { + /* First call to decrypt finalizes GHASH(AAD) */ + GCM_MUL(ctx,Xi); + ctx->ares = 0; + } + +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctr = BSWAP4(ctx->Yi.d[3]); +#else + ctr = GETU32(ctx->Yi.c+12); +#endif +#else /* BIG_ENDIAN */ + ctr = ctx->Yi.d[3]; +#endif + + n = ctx->mres; +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (16%sizeof(size_t) == 0) do { /* always true actually */ + if (n) { + while (n && len) { + u8 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 0; + } + } +#ifdef __STRICT_ALIGNMENT + if (((size_t)in|(size_t)out)%sizeof(size_t) != 0) + break; +#endif +#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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + 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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + 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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + for (i=0; i<16/sizeof(size_t); ++i) { + size_t c = in[i]; + out[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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + while (len--) { + u8 c = in[n]; + ctx->Xi.c[n] ^= c; + out[n] = c^ctx->EKi.c[n]; + ++n; + } + } + + ctx->mres = n; + return 0; + } while(0); +#endif + for (i=0;i<len;++i) { + u8 c; + if (n==0) { + (*block)(ctx->Yi.c,ctx->EKi.c,key); + ++ctr; +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + } + 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 0; +} + +int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx, + const unsigned char *in, unsigned char *out, + size_t len, ctr128_f stream) +{ + unsigned int n, ctr; + size_t i; + u64 mlen = ctx->len.u[1]; + void *key = ctx->key; +#ifdef GCM_FUNCREF_4BIT + void (*gcm_gmult_p)(u64 Xi[2],const u128 Htable[16]) = ctx->gmult; +# ifdef GHASH + void (*gcm_ghash_p)(u64 Xi[2],const u128 Htable[16], + const u8 *inp,size_t len) = ctx->ghash; +# endif +#endif + + mlen += len; + if (mlen>((U64(1)<<36)-32) || (sizeof(len)==8 && mlen<len)) + return -1; + ctx->len.u[1] = mlen; + + if (ctx->ares) { + /* First call to encrypt finalizes GHASH(AAD) */ + GCM_MUL(ctx,Xi); + ctx->ares = 0; + } + +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctr = BSWAP4(ctx->Yi.d[3]); +#else + ctr = GETU32(ctx->Yi.c+12); +#endif +#else /* BIG_ENDIAN */ + ctr = ctx->Yi.d[3]; +#endif + + 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 0; + } + } +#if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT) + while (len>=GHASH_CHUNK) { + (*stream)(in,out,GHASH_CHUNK/16,key,ctx->Yi.c); + ctr += GHASH_CHUNK/16; +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + 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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + 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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + while (len--) { + ctx->Xi.c[n] ^= out[n] = in[n]^ctx->EKi.c[n]; + ++n; + } + } + + ctx->mres = n; + return 0; +} + +int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx, + const unsigned char *in, unsigned char *out, + size_t len,ctr128_f stream) +{ + unsigned int n, ctr; + size_t i; + u64 mlen = ctx->len.u[1]; + void *key = ctx->key; +#ifdef GCM_FUNCREF_4BIT + void (*gcm_gmult_p)(u64 Xi[2],const u128 Htable[16]) = ctx->gmult; +# ifdef GHASH + void (*gcm_ghash_p)(u64 Xi[2],const u128 Htable[16], + const u8 *inp,size_t len) = ctx->ghash; +# endif +#endif + + mlen += len; + if (mlen>((U64(1)<<36)-32) || (sizeof(len)==8 && mlen<len)) + return -1; + ctx->len.u[1] = mlen; + + if (ctx->ares) { + /* First call to decrypt finalizes GHASH(AAD) */ + GCM_MUL(ctx,Xi); + ctx->ares = 0; + } + +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctr = BSWAP4(ctx->Yi.d[3]); +#else + ctr = GETU32(ctx->Yi.c+12); +#endif +#else /* BIG_ENDIAN */ + ctr = ctx->Yi.d[3]; +#endif + + n = ctx->mres; + if (n) { + while (n && len) { + u8 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 0; + } + } +#if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT) + while (len>=GHASH_CHUNK) { + GHASH(ctx,in,GHASH_CHUNK); + (*stream)(in,out,GHASH_CHUNK/16,key,ctx->Yi.c); + ctr += GHASH_CHUNK/16; +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + 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 BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + out += i; + in += i; + len -= i; + } + if (len) { + (*ctx->block)(ctx->Yi.c,ctx->EKi.c,key); + ++ctr; +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP4 + ctx->Yi.d[3] = BSWAP4(ctr); +#else + PUTU32(ctx->Yi.c+12,ctr); +#endif +#else /* BIG_ENDIAN */ + ctx->Yi.d[3] = ctr; +#endif + while (len--) { + u8 c = in[n]; + ctx->Xi.c[n] ^= c; + out[n] = c^ctx->EKi.c[n]; + ++n; + } + } + + ctx->mres = n; + return 0; +} + +int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx,const unsigned char *tag, + size_t len) +{ + u64 alen = ctx->len.u[0]<<3; + u64 clen = ctx->len.u[1]<<3; +#ifdef GCM_FUNCREF_4BIT + void (*gcm_gmult_p)(u64 Xi[2],const u128 Htable[16]) = ctx->gmult; +#endif + + if (ctx->mres || ctx->ares) + GCM_MUL(ctx,Xi); + +#if BYTE_ORDER == LITTLE_ENDIAN +#ifdef BSWAP8 + alen = BSWAP8(alen); + clen = BSWAP8(clen); +#else + { + u8 *p = ctx->len.c; + + ctx->len.u[0] = alen; + ctx->len.u[1] = clen; + + alen = (u64)GETU32(p) <<32|GETU32(p+4); + clen = (u64)GETU32(p+8)<<32|GETU32(p+12); + } +#endif +#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 memcmp(ctx->Xi.c,tag,len); + else + return -1; +} + +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)); +} + +#if 0 + +GCM128_CONTEXT *CRYPTO_gcm128_new(void *key, block128_f block) +{ + GCM128_CONTEXT *ret; + + if ((ret = malloc(sizeof(GCM128_CONTEXT)))) + CRYPTO_gcm128_init(ret,key,block); + + return ret; +} + +void CRYPTO_gcm128_release(GCM128_CONTEXT *ctx) +{ + freezero(ctx, sizeof(*ctx)); +} + +#endif |