/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:4;tab-width:4;coding:utf-8 -*-│ │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│ ╞══════════════════════════════════════════════════════════════════════════════╡ │ Copyright The Mbed TLS Contributors │ │ │ │ Licensed under the Apache License, Version 2.0 (the "License"); │ │ you may not use this file except in compliance with the License. │ │ You may obtain a copy of the License at │ │ │ │ http://www.apache.org/licenses/LICENSE-2.0 │ │ │ │ Unless required by applicable law or agreed to in writing, software │ │ distributed under the License is distributed on an "AS IS" BASIS, │ │ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. │ │ See the License for the specific language governing permissions and │ │ limitations under the License. │ ╚─────────────────────────────────────────────────────────────────────────────*/ #include "libc/bits/bits.h" #include "libc/str/str.h" #include "third_party/mbedtls/aesni.h" #include "third_party/mbedtls/common.h" asm(".ident\t\"\\n\\n\ Mbed TLS (Apache 2.0)\\n\ Copyright ARM Limited\\n\ Copyright Mbed TLS Contributors\""); asm(".include \"libc/disclaimer.inc\""); /* clang-format off */ /* * [AES-WP] http://software.intel.com/en-us/articles/intel-advanced-encryption-standard-aes-instructions-set * [CLMUL-WP] http://software.intel.com/en-us/articles/intel-carry-less-multiplication-instruction-and-its-usage-for-computing-the-gcm-mode/ */ #if defined(MBEDTLS_AESNI_C) #if defined(MBEDTLS_HAVE_X86_64) /* * Binutils needs to be at least 2.19 to support AES-NI instructions. * Unfortunately, a lot of users have a lower version now (2014-04). * Emit bytecode directly in order to support "old" version of gas. * * Opcodes from the Intel architecture reference manual, vol. 3. * We always use registers, so we don't need prefixes for memory operands. * Operand macros are in gas order (src, dst) as opposed to Intel order * (dst, src) in order to blend better into the surrounding assembly code. */ #define AESDEC ".byte 0x66,0x0F,0x38,0xDE," #define AESDECLAST ".byte 0x66,0x0F,0x38,0xDF," #define AESENC ".byte 0x66,0x0F,0x38,0xDC," #define AESENCLAST ".byte 0x66,0x0F,0x38,0xDD," #define AESIMC ".byte 0x66,0x0F,0x38,0xDB," #define AESKEYGENA ".byte 0x66,0x0F,0x3A,0xDF," #define PCLMULQDQ ".byte 0x66,0x0F,0x3A,0x44," #define xmm0_xmm0 "0xC0" #define xmm0_xmm1 "0xC8" #define xmm0_xmm2 "0xD0" #define xmm0_xmm3 "0xD8" #define xmm0_xmm4 "0xE0" #define xmm1_xmm0 "0xC1" #define xmm1_xmm2 "0xD1" /** * \brief Internal AES-NI AES-ECB block encryption and decryption * * \note This function is only for internal use by other library * functions; you must not call it directly. * * \param ctx AES context * \param mode MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT * \param input 16-byte input block * \param output 16-byte output block * * \return 0 on success (cannot fail) */ int mbedtls_aesni_crypt_ecb( mbedtls_aes_context *ctx, int mode, const unsigned char input[16], unsigned char output[16] ) { asm( "movdqu (%3), %%xmm0 \n\t" // load input "movdqu (%1), %%xmm1 \n\t" // load round key 0 "pxor %%xmm1, %%xmm0 \n\t" // round 0 "add $16, %1 \n\t" // point to next round key "subl $1, %0 \n\t" // normal rounds = nr - 1 "test %2, %2 \n\t" // mode? "jz 2f \n\t" // 0 = decrypt "1: \n\t" // encryption loop "movdqu (%1), %%xmm1 \n\t" // load round key "aesenc %%xmm1, %%xmm0 \n\t" // do round "add $16, %1 \n\t" // point to next round key "subl $1, %0 \n\t" // loop "jnz 1b \n\t" "movdqu (%1), %%xmm1 \n\t" // load round key "aesenclast %%xmm1, %%xmm0 \n\t" // last round "jmp 3f \n\t" "2: \n\t" // decryption loop "movdqu (%1), %%xmm1 \n\t" "aesdec %%xmm1, %%xmm0 \n\t" // do round "add $16, %1 \n\t" "subl $1, %0 \n\t" "jnz 2b \n\t" "movdqu (%1), %%xmm1 \n\t" // load round key "aesdeclast %%xmm1,%%xmm0 \n\t" // last round "3: \n\t" "movdqu %%xmm0, (%4) \n\t" // export output : : "r" (ctx->nr), "r" (ctx->rk), "r" (mode), "r" (input), "r" (output) : "memory", "cc", "xmm0", "xmm1" ); return( 0 ); } /** * \brief Internal GCM multiplication: a = a * b in GF(2^128) * Based on [CLMUL-WP] algorithms 1 (with equation 27) and 5. * * \note This function is intended for internal use. * * \param a First operand (big endian) * \param b Second operand (host endian) * * \note Both operands and result are bit strings interpreted as * elements of GF(2^128) as per the GCM spec. */ void mbedtls_aesni_gcm_mult( unsigned char a[16], const uint64_t b[2] ) { size_t i; uint64_t aa _Vector_size(16) forcealign(16); uint64_t bb _Vector_size(16) forcealign(16); /* The inputs are in big-endian order, so byte-reverse them */ aa[0] = READ64BE(a+8); aa[1] = READ64BE(a+0); memcpy(&bb, b, 16); asm( /* * Caryless multiplication xmm2:xmm1 = xmm0 * xmm1 * using [CLMUL-WP] algorithm 1 (p. 13). */ "movdqa %1, %%xmm2 \n\t" // copy of b1:b0 "movdqa %1, %%xmm3 \n\t" // same "movdqa %1, %%xmm4 \n\t" // same "pclmullqlqdq %0,%1 \n\t" // a0*b0 = c1:c0 "pclmulhqhqdq %0,%%xmm2 \n\t" // a1*b1 = d1:d0 "pclmullqhqdq %0,%%xmm3 \n\t" // a0*b1 = e1:e0 "pclmulhqlqdq %0,%%xmm4 \n\t" // a1*b0 = f1:f0 "pxor %%xmm3, %%xmm4 \n\t" // e1+f1:e0+f0 "movdqa %%xmm4, %%xmm3 \n\t" // same "psrldq $8, %%xmm4 \n\t" // 0:e1+f1 "pslldq $8, %%xmm3 \n\t" // e0+f0:0 "pxor %%xmm4, %%xmm2 \n\t" // d1:d0+e1+f1 "pxor %%xmm3, %1 \n\t" // c1+e0+f1:c0 /* * Now shift the result one bit to the left, * taking advantage of [CLMUL-WP] eq 27 (p. 20) */ "movdqa %1, %%xmm3 \n\t" // r1:r0 "movdqa %%xmm2, %%xmm4 \n\t" // r3:r2 "psllq $1, %1 \n\t" // r1<<1:r0<<1 "psllq $1, %%xmm2 \n\t" // r3<<1:r2<<1 "psrlq $63, %%xmm3 \n\t" // r1>>63:r0>>63 "psrlq $63, %%xmm4 \n\t" // r3>>63:r2>>63 "movdqa %%xmm3, %%xmm5 \n\t" // r1>>63:r0>>63 "pslldq $8, %%xmm3 \n\t" // r0>>63:0 "pslldq $8, %%xmm4 \n\t" // r2>>63:0 "psrldq $8, %%xmm5 \n\t" // 0:r1>>63 "por %%xmm3, %1 \n\t" // r1<<1|r0>>63:r0<<1 "por %%xmm4, %%xmm2 \n\t" // r3<<1|r2>>62:r2<<1 "por %%xmm5, %%xmm2 \n\t" // r3<<1|r2>>62:r2<<1|r1>>63 /* * Now reduce modulo the GCM polynomial x^128 + x^7 + x^2 + x + 1 * using [CLMUL-WP] algorithm 5 (p. 20). * Currently xmm2:xmm1 holds x3:x2:x1:x0 (already shifted). */ /* Step 2 (1) */ "movdqa %1, %%xmm3 \n\t" // x1:x0 "movdqa %1, %%xmm4 \n\t" // same "movdqa %1, %%xmm5 \n\t" // same "psllq $63, %%xmm3 \n\t" // x1<<63:x0<<63 = stuff:a "psllq $62, %%xmm4 \n\t" // x1<<62:x0<<62 = stuff:b "psllq $57, %%xmm5 \n\t" // x1<<57:x0<<57 = stuff:c /* Step 2 (2) */ "pxor %%xmm4, %%xmm3 \n\t" // stuff:a+b "pxor %%xmm5, %%xmm3 \n\t" // stuff:a+b+c "pslldq $8, %%xmm3 \n\t" // a+b+c:0 "pxor %%xmm3, %1 \n\t" // x1+a+b+c:x0 = d:x0 /* Steps 3 and 4 */ "movdqa %1,%0 \n\t" // d:x0 "movdqa %1,%%xmm4 \n\t" // same "movdqa %1,%%xmm5 \n\t" // same "psrlq $1, %0 \n\t" // e1:x0>>1 = e1:e0' "psrlq $2, %%xmm4 \n\t" // f1:x0>>2 = f1:f0' "psrlq $7, %%xmm5 \n\t" // g1:x0>>7 = g1:g0' "pxor %%xmm4, %0 \n\t" // e1+f1:e0'+f0' "pxor %%xmm5, %0 \n\t" // e1+f1+g1:e0'+f0'+g0' // e0'+f0'+g0' is almost e0+f0+g0, ex\tcept for some missing // bits carried from d. Now get those\t bits back in. "movdqa %1,%%xmm3 \n\t" // d:x0 "movdqa %1,%%xmm4 \n\t" // same "movdqa %1,%%xmm5 \n\t" // same "psllq $63, %%xmm3 \n\t" // d<<63:stuff "psllq $62, %%xmm4 \n\t" // d<<62:stuff "psllq $57, %%xmm5 \n\t" // d<<57:stuff "pxor %%xmm4, %%xmm3 \n\t" // d<<63+d<<62:stuff "pxor %%xmm5, %%xmm3 \n\t" // missing bits of d:stuff "psrldq $8, %%xmm3 \n\t" // 0:missing bits of d "pxor %%xmm3, %0 \n\t" // e1+f1+g1:e0+f0+g0 "pxor %1, %0 \n\t" // h1:h0 "pxor %%xmm2, %0 \n\t" // x3+h1:x2+h0 : "+x" (aa) : "x" (bb) : "xmm2", "xmm3", "xmm4", "xmm5" ); /* Now byte-reverse the outputs */ WRITE64BE(a+0, aa[1]); WRITE64BE(a+8, aa[0]); } /** * \brief Internal round key inversion. This function computes * decryption round keys from the encryption round keys. * * \note This function is only for internal use by other library * functions; you must not call it directly. * * \param invkey Round keys for the equivalent inverse cipher * \param fwdkey Original round keys (for encryption) * \param nr Number of rounds (that is, number of round keys minus one) */ void mbedtls_aesni_inverse_key( unsigned char *invkey, const unsigned char *fwdkey, int nr ) { unsigned char *ik = invkey; const unsigned char *fk = fwdkey + 16 * nr; memcpy( ik, fk, 16 ); for( fk -= 16, ik += 16; fk > fwdkey; fk -= 16, ik += 16 ) asm( "movdqu (%0), %%xmm0 \n\t" AESIMC xmm0_xmm0 "\n\t" "movdqu %%xmm0, (%1) \n\t" : : "r" (fk), "r" (ik) : "memory", "xmm0" ); memcpy( ik, fk, 16 ); } /* * Key expansion, 128-bit case */ static void aesni_setkey_enc_128( unsigned char *rk, const unsigned char *key ) { asm( "movdqu (%1), %%xmm0 \n\t" // copy the original key "movdqu %%xmm0, (%0) \n\t" // as round key 0 "jmp 2f \n\t" // skip auxiliary routine /* * Finish generating the next round key. * * On entry xmm0 is r3:r2:r1:r0 and xmm1 is X:stuff:stuff:stuff * with X = rot( sub( r3 ) ) ^ RCON. * * On exit, xmm0 is r7:r6:r5:r4 * with r4 = X + r0, r5 = r4 + r1, r6 = r5 + r2, r7 = r6 + r3 * and those are written to the round key buffer. */ "1: \n\t" "pshufd $0xff, %%xmm1, %%xmm1 \n\t" // X:X:X:X "pxor %%xmm0, %%xmm1 \n\t" // X+r3:X+r2:X+r1:r4 "pslldq $4, %%xmm0 \n\t" // r2:r1:r0:0 "pxor %%xmm0, %%xmm1 \n\t" // X+r3+r2:X+r2+r1:r5:r4 "pslldq $4, %%xmm0 \n\t" // etc "pxor %%xmm0, %%xmm1 \n\t" "pslldq $4, %%xmm0 \n\t" "pxor %%xmm1, %%xmm0 \n\t" // update xmm0 for next time! "add $16, %0 \n\t" // point to next round key "movdqu %%xmm0, (%0) \n\t" // write it "ret \n\t" /* Main "loop" */ "2: \n\t" AESKEYGENA xmm0_xmm1 ",0x01 \n\tcall 1b \n\t" AESKEYGENA xmm0_xmm1 ",0x02 \n\tcall 1b \n\t" AESKEYGENA xmm0_xmm1 ",0x04 \n\tcall 1b \n\t" AESKEYGENA xmm0_xmm1 ",0x08 \n\tcall 1b \n\t" AESKEYGENA xmm0_xmm1 ",0x10 \n\tcall 1b \n\t" AESKEYGENA xmm0_xmm1 ",0x20 \n\tcall 1b \n\t" AESKEYGENA xmm0_xmm1 ",0x40 \n\tcall 1b \n\t" AESKEYGENA xmm0_xmm1 ",0x80 \n\tcall 1b \n\t" AESKEYGENA xmm0_xmm1 ",0x1B \n\tcall 1b \n\t" AESKEYGENA xmm0_xmm1 ",0x36 \n\tcall 1b \n\t" : : "r" (rk), "r" (key) : "memory", "cc", "0" ); } /* * Key expansion, 192-bit case */ static void aesni_setkey_enc_192( unsigned char *rk, const unsigned char *key ) { asm( "movdqu (%1), %%xmm0 \n\t" // copy original round key "movdqu %%xmm0, (%0) \n\t" "add $16, %0 \n\t" "movq 16(%1), %%xmm1 \n\t" "movq %%xmm1, (%0) \n\t" "add $8, %0 \n\t" "jmp 2f \n\t" // skip auxiliary routine /* * Finish generating the next 6 quarter-keys. * * On entry xmm0 is r3:r2:r1:r0, xmm1 is stuff:stuff:r5:r4 * and xmm2 is stuff:stuff:X:stuff with X = rot( sub( r3 ) ) ^ RCON. * * On exit, xmm0 is r9:r8:r7:r6 and xmm1 is stuff:stuff:r11:r10 * and those are written to the round key buffer. */ "1: \n\t" "pshufd $0x55, %%xmm2, %%xmm2 \n\t" // X:X:X:X "pxor %%xmm0, %%xmm2 \n\t" // X+r3:X+r2:X+r1:r4 "pslldq $4, %%xmm0 \n\t" // etc "pxor %%xmm0, %%xmm2 \n\t" "pslldq $4, %%xmm0 \n\t" "pxor %%xmm0, %%xmm2 \n\t" "pslldq $4, %%xmm0 \n\t" "pxor %%xmm2, %%xmm0 \n\t" // update xmm0 = r9:r8:r7:r6 "movdqu %%xmm0, (%0) \n\t" "add $16, %0 \n\t" "pshufd $0xff, %%xmm0, %%xmm2 \n\t" // r9:r9:r9:r9 "pxor %%xmm1, %%xmm2 \n\t" // stuff:stuff:r9+r5:r10 "pslldq $4, %%xmm1 \n\t" // r2:r1:r0:0 "pxor %%xmm2, %%xmm1 \n\t" // xmm1 = stuff:stuff:r11:r10 "movq %%xmm1, (%0) \n\t" "add $8, %0 \n\t" "ret \n\t" "2: \n\t" AESKEYGENA xmm1_xmm2 ",0x01 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x02 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x04 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x08 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x10 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x20 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x40 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x80 \n\tcall 1b \n\t" : : "r" (rk), "r" (key) : "memory", "cc", "0" ); } /* * Key expansion, 256-bit case */ static void aesni_setkey_enc_256( unsigned char *rk, const unsigned char *key ) { asm( "movdqu (%1), %%xmm0 \n\t" "movdqu %%xmm0, (%0) \n\t" "add $16, %0 \n\t" "movdqu 16(%1), %%xmm1 \n\t" "movdqu %%xmm1, (%0) \n\t" "jmp 2f \n\t" // skip auxiliary routine /* * Finish generating the next two round keys. * * On entry xmm0 is r3:r2:r1:r0, xmm1 is r7:r6:r5:r4 and * xmm2 is X:stuff:stuff:stuff with X = rot( sub( r7 )) ^ RCON * * On exit, xmm0 is r11:r10:r9:r8 and xmm1 is r15:r14:r13:r12 * and those have been written to the output buffer. */ "1: \n\t" "pshufd $0xff, %%xmm2, %%xmm2 \n\t" "pxor %%xmm0, %%xmm2 \n\t" "pslldq $4, %%xmm0 \n\t" "pxor %%xmm0, %%xmm2 \n\t" "pslldq $4, %%xmm0 \n\t" "pxor %%xmm0, %%xmm2 \n\t" "pslldq $4, %%xmm0 \n\t" "pxor %%xmm2, %%xmm0 \n\t" "add $16, %0 \n\t" "movdqu %%xmm0, (%0) \n\t" /* Set xmm2 to stuff:Y:stuff:stuff with Y = subword( r11 ) * and proceed to generate next round key from there */ AESKEYGENA xmm0_xmm2 ",0x00 \n\t" "pshufd $0xaa, %%xmm2, %%xmm2 \n\t" "pxor %%xmm1, %%xmm2 \n\t" "pslldq $4, %%xmm1 \n\t" "pxor %%xmm1, %%xmm2 \n\t" "pslldq $4, %%xmm1 \n\t" "pxor %%xmm1, %%xmm2 \n\t" "pslldq $4, %%xmm1 \n\t" "pxor %%xmm2, %%xmm1 \n\t" "add $16, %0 \n\t" "movdqu %%xmm1, (%0) \n\t" "ret \n\t" /* * Main "loop" - Generating one more key than necessary, * see definition of mbedtls_aes_context.buf */ "2: \n\t" AESKEYGENA xmm1_xmm2 ",0x01 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x02 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x04 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x08 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x10 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x20 \n\tcall 1b \n\t" AESKEYGENA xmm1_xmm2 ",0x40 \n\tcall 1b \n\t" : : "r" (rk), "r" (key) : "memory", "cc", "0" ); } /** * \brief Internal key expansion for encryption * * \note This function is only for internal use by other library * functions; you must not call it directly. * * \param rk Destination buffer where the round keys are written * \param key Encryption key * \param bits Key size in bits (must be 128, 192 or 256) * * \return 0 if successful, or MBEDTLS_ERR_AES_INVALID_KEY_LENGTH */ int mbedtls_aesni_setkey_enc( unsigned char *rk, const unsigned char *key, size_t bits ) { switch( bits ) { case 128: aesni_setkey_enc_128( rk, key ); break; case 192: aesni_setkey_enc_192( rk, key ); break; case 256: aesni_setkey_enc_256( rk, key ); break; default : return( MBEDTLS_ERR_AES_INVALID_KEY_LENGTH ); } return( 0 ); } #endif /* MBEDTLS_HAVE_X86_64 */ #endif /* MBEDTLS_AESNI_C */