/* * Copyright (c) 2017 Thomas Pornin * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #define BR_POWER_ASM_MACROS 1 #include "inner.h" #if BR_POWER8 /* see bearssl_block.h */ void br_aes_pwr8_cbcdec_init(br_aes_pwr8_cbcdec_keys *ctx, const void *key, size_t len) { ctx->vtable = &br_aes_pwr8_cbcdec_vtable; ctx->num_rounds = br_aes_pwr8_keysched(ctx->skey.skni, key, len); } static void cbcdec_128(const unsigned char *sk, const unsigned char *iv, unsigned char *buf, size_t num_blocks) { long cc0, cc1, cc2, cc3; #if BR_POWER8_LE static const uint32_t idx2be[] = { 0x03020100, 0x07060504, 0x0B0A0908, 0x0F0E0D0C }; #endif cc0 = 0; cc1 = 16; cc2 = 32; cc3 = 48; asm volatile ( /* * Load subkeys into v0..v10 */ lxvw4x(32, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(33, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(34, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(35, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(36, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(37, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(38, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(39, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(40, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(41, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(42, %[cc0], %[sk]) li(%[cc0], 0) #if BR_POWER8_LE /* * v15 = constant for byteswapping words */ lxvw4x(47, 0, %[idx2be]) #endif /* * Load IV into v24. */ lxvw4x(56, 0, %[iv]) #if BR_POWER8_LE vperm(24, 24, 24, 15) #endif mtctr(%[num_blocks]) label(loop) /* * Load next ciphertext words in v16..v19. Also save them * in v20..v23. */ lxvw4x(48, %[cc0], %[buf]) lxvw4x(49, %[cc1], %[buf]) lxvw4x(50, %[cc2], %[buf]) lxvw4x(51, %[cc3], %[buf]) #if BR_POWER8_LE vperm(16, 16, 16, 15) vperm(17, 17, 17, 15) vperm(18, 18, 18, 15) vperm(19, 19, 19, 15) #endif vand(20, 16, 16) vand(21, 17, 17) vand(22, 18, 18) vand(23, 19, 19) /* * Decrypt the blocks. */ vxor(16, 16, 10) vxor(17, 17, 10) vxor(18, 18, 10) vxor(19, 19, 10) vncipher(16, 16, 9) vncipher(17, 17, 9) vncipher(18, 18, 9) vncipher(19, 19, 9) vncipher(16, 16, 8) vncipher(17, 17, 8) vncipher(18, 18, 8) vncipher(19, 19, 8) vncipher(16, 16, 7) vncipher(17, 17, 7) vncipher(18, 18, 7) vncipher(19, 19, 7) vncipher(16, 16, 6) vncipher(17, 17, 6) vncipher(18, 18, 6) vncipher(19, 19, 6) vncipher(16, 16, 5) vncipher(17, 17, 5) vncipher(18, 18, 5) vncipher(19, 19, 5) vncipher(16, 16, 4) vncipher(17, 17, 4) vncipher(18, 18, 4) vncipher(19, 19, 4) vncipher(16, 16, 3) vncipher(17, 17, 3) vncipher(18, 18, 3) vncipher(19, 19, 3) vncipher(16, 16, 2) vncipher(17, 17, 2) vncipher(18, 18, 2) vncipher(19, 19, 2) vncipher(16, 16, 1) vncipher(17, 17, 1) vncipher(18, 18, 1) vncipher(19, 19, 1) vncipherlast(16, 16, 0) vncipherlast(17, 17, 0) vncipherlast(18, 18, 0) vncipherlast(19, 19, 0) /* * XOR decrypted blocks with IV / previous block. */ vxor(16, 16, 24) vxor(17, 17, 20) vxor(18, 18, 21) vxor(19, 19, 22) /* * Store back result (with byteswap) */ #if BR_POWER8_LE vperm(16, 16, 16, 15) vperm(17, 17, 17, 15) vperm(18, 18, 18, 15) vperm(19, 19, 19, 15) #endif stxvw4x(48, %[cc0], %[buf]) stxvw4x(49, %[cc1], %[buf]) stxvw4x(50, %[cc2], %[buf]) stxvw4x(51, %[cc3], %[buf]) /* * Fourth encrypted block is IV for next run. */ vand(24, 23, 23) addi(%[buf], %[buf], 64) bdnz(loop) : [cc0] "+b" (cc0), [cc1] "+b" (cc1), [cc2] "+b" (cc2), [cc3] "+b" (cc3), [buf] "+b" (buf) : [sk] "b" (sk), [iv] "b" (iv), [num_blocks] "b" (num_blocks >> 2) #if BR_POWER8_LE , [idx2be] "b" (idx2be) #endif : "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", "ctr", "memory" ); } static void cbcdec_192(const unsigned char *sk, const unsigned char *iv, unsigned char *buf, size_t num_blocks) { long cc0, cc1, cc2, cc3; #if BR_POWER8_LE static const uint32_t idx2be[] = { 0x03020100, 0x07060504, 0x0B0A0908, 0x0F0E0D0C }; #endif cc0 = 0; cc1 = 16; cc2 = 32; cc3 = 48; asm volatile ( /* * Load subkeys into v0..v12 */ lxvw4x(32, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(33, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(34, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(35, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(36, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(37, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(38, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(39, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(40, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(41, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(42, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(43, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(44, %[cc0], %[sk]) li(%[cc0], 0) #if BR_POWER8_LE /* * v15 = constant for byteswapping words */ lxvw4x(47, 0, %[idx2be]) #endif /* * Load IV into v24. */ lxvw4x(56, 0, %[iv]) #if BR_POWER8_LE vperm(24, 24, 24, 15) #endif mtctr(%[num_blocks]) label(loop) /* * Load next ciphertext words in v16..v19. Also save them * in v20..v23. */ lxvw4x(48, %[cc0], %[buf]) lxvw4x(49, %[cc1], %[buf]) lxvw4x(50, %[cc2], %[buf]) lxvw4x(51, %[cc3], %[buf]) #if BR_POWER8_LE vperm(16, 16, 16, 15) vperm(17, 17, 17, 15) vperm(18, 18, 18, 15) vperm(19, 19, 19, 15) #endif vand(20, 16, 16) vand(21, 17, 17) vand(22, 18, 18) vand(23, 19, 19) /* * Decrypt the blocks. */ vxor(16, 16, 12) vxor(17, 17, 12) vxor(18, 18, 12) vxor(19, 19, 12) vncipher(16, 16, 11) vncipher(17, 17, 11) vncipher(18, 18, 11) vncipher(19, 19, 11) vncipher(16, 16, 10) vncipher(17, 17, 10) vncipher(18, 18, 10) vncipher(19, 19, 10) vncipher(16, 16, 9) vncipher(17, 17, 9) vncipher(18, 18, 9) vncipher(19, 19, 9) vncipher(16, 16, 8) vncipher(17, 17, 8) vncipher(18, 18, 8) vncipher(19, 19, 8) vncipher(16, 16, 7) vncipher(17, 17, 7) vncipher(18, 18, 7) vncipher(19, 19, 7) vncipher(16, 16, 6) vncipher(17, 17, 6) vncipher(18, 18, 6) vncipher(19, 19, 6) vncipher(16, 16, 5) vncipher(17, 17, 5) vncipher(18, 18, 5) vncipher(19, 19, 5) vncipher(16, 16, 4) vncipher(17, 17, 4) vncipher(18, 18, 4) vncipher(19, 19, 4) vncipher(16, 16, 3) vncipher(17, 17, 3) vncipher(18, 18, 3) vncipher(19, 19, 3) vncipher(16, 16, 2) vncipher(17, 17, 2) vncipher(18, 18, 2) vncipher(19, 19, 2) vncipher(16, 16, 1) vncipher(17, 17, 1) vncipher(18, 18, 1) vncipher(19, 19, 1) vncipherlast(16, 16, 0) vncipherlast(17, 17, 0) vncipherlast(18, 18, 0) vncipherlast(19, 19, 0) /* * XOR decrypted blocks with IV / previous block. */ vxor(16, 16, 24) vxor(17, 17, 20) vxor(18, 18, 21) vxor(19, 19, 22) /* * Store back result (with byteswap) */ #if BR_POWER8_LE vperm(16, 16, 16, 15) vperm(17, 17, 17, 15) vperm(18, 18, 18, 15) vperm(19, 19, 19, 15) #endif stxvw4x(48, %[cc0], %[buf]) stxvw4x(49, %[cc1], %[buf]) stxvw4x(50, %[cc2], %[buf]) stxvw4x(51, %[cc3], %[buf]) /* * Fourth encrypted block is IV for next run. */ vand(24, 23, 23) addi(%[buf], %[buf], 64) bdnz(loop) : [cc0] "+b" (cc0), [cc1] "+b" (cc1), [cc2] "+b" (cc2), [cc3] "+b" (cc3), [buf] "+b" (buf) : [sk] "b" (sk), [iv] "b" (iv), [num_blocks] "b" (num_blocks >> 2) #if BR_POWER8_LE , [idx2be] "b" (idx2be) #endif : "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", "ctr", "memory" ); } static void cbcdec_256(const unsigned char *sk, const unsigned char *iv, unsigned char *buf, size_t num_blocks) { long cc0, cc1, cc2, cc3; #if BR_POWER8_LE static const uint32_t idx2be[] = { 0x03020100, 0x07060504, 0x0B0A0908, 0x0F0E0D0C }; #endif cc0 = 0; cc1 = 16; cc2 = 32; cc3 = 48; asm volatile ( /* * Load subkeys into v0..v14 */ lxvw4x(32, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(33, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(34, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(35, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(36, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(37, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(38, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(39, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(40, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(41, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(42, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(43, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(44, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(45, %[cc0], %[sk]) addi(%[cc0], %[cc0], 16) lxvw4x(46, %[cc0], %[sk]) li(%[cc0], 0) #if BR_POWER8_LE /* * v15 = constant for byteswapping words */ lxvw4x(47, 0, %[idx2be]) #endif /* * Load IV into v24. */ lxvw4x(56, 0, %[iv]) #if BR_POWER8_LE vperm(24, 24, 24, 15) #endif mtctr(%[num_blocks]) label(loop) /* * Load next ciphertext words in v16..v19. Also save them * in v20..v23. */ lxvw4x(48, %[cc0], %[buf]) lxvw4x(49, %[cc1], %[buf]) lxvw4x(50, %[cc2], %[buf]) lxvw4x(51, %[cc3], %[buf]) #if BR_POWER8_LE vperm(16, 16, 16, 15) vperm(17, 17, 17, 15) vperm(18, 18, 18, 15) vperm(19, 19, 19, 15) #endif vand(20, 16, 16) vand(21, 17, 17) vand(22, 18, 18) vand(23, 19, 19) /* * Decrypt the blocks. */ vxor(16, 16, 14) vxor(17, 17, 14) vxor(18, 18, 14) vxor(19, 19, 14) vncipher(16, 16, 13) vncipher(17, 17, 13) vncipher(18, 18, 13) vncipher(19, 19, 13) vncipher(16, 16, 12) vncipher(17, 17, 12) vncipher(18, 18, 12) vncipher(19, 19, 12) vncipher(16, 16, 11) vncipher(17, 17, 11) vncipher(18, 18, 11) vncipher(19, 19, 11) vncipher(16, 16, 10) vncipher(17, 17, 10) vncipher(18, 18, 10) vncipher(19, 19, 10) vncipher(16, 16, 9) vncipher(17, 17, 9) vncipher(18, 18, 9) vncipher(19, 19, 9) vncipher(16, 16, 8) vncipher(17, 17, 8) vncipher(18, 18, 8) vncipher(19, 19, 8) vncipher(16, 16, 7) vncipher(17, 17, 7) vncipher(18, 18, 7) vncipher(19, 19, 7) vncipher(16, 16, 6) vncipher(17, 17, 6) vncipher(18, 18, 6) vncipher(19, 19, 6) vncipher(16, 16, 5) vncipher(17, 17, 5) vncipher(18, 18, 5) vncipher(19, 19, 5) vncipher(16, 16, 4) vncipher(17, 17, 4) vncipher(18, 18, 4) vncipher(19, 19, 4) vncipher(16, 16, 3) vncipher(17, 17, 3) vncipher(18, 18, 3) vncipher(19, 19, 3) vncipher(16, 16, 2) vncipher(17, 17, 2) vncipher(18, 18, 2) vncipher(19, 19, 2) vncipher(16, 16, 1) vncipher(17, 17, 1) vncipher(18, 18, 1) vncipher(19, 19, 1) vncipherlast(16, 16, 0) vncipherlast(17, 17, 0) vncipherlast(18, 18, 0) vncipherlast(19, 19, 0) /* * XOR decrypted blocks with IV / previous block. */ vxor(16, 16, 24) vxor(17, 17, 20) vxor(18, 18, 21) vxor(19, 19, 22) /* * Store back result (with byteswap) */ #if BR_POWER8_LE vperm(16, 16, 16, 15) vperm(17, 17, 17, 15) vperm(18, 18, 18, 15) vperm(19, 19, 19, 15) #endif stxvw4x(48, %[cc0], %[buf]) stxvw4x(49, %[cc1], %[buf]) stxvw4x(50, %[cc2], %[buf]) stxvw4x(51, %[cc3], %[buf]) /* * Fourth encrypted block is IV for next run. */ vand(24, 23, 23) addi(%[buf], %[buf], 64) bdnz(loop) : [cc0] "+b" (cc0), [cc1] "+b" (cc1), [cc2] "+b" (cc2), [cc3] "+b" (cc3), [buf] "+b" (buf) : [sk] "b" (sk), [iv] "b" (iv), [num_blocks] "b" (num_blocks >> 2) #if BR_POWER8_LE , [idx2be] "b" (idx2be) #endif : "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", "ctr", "memory" ); } /* see bearssl_block.h */ void br_aes_pwr8_cbcdec_run(const br_aes_pwr8_cbcdec_keys *ctx, void *iv, void *data, size_t len) { unsigned char nextiv[16]; unsigned char *buf; if (len == 0) { return; } buf = data; memcpy(nextiv, buf + len - 16, 16); if (len >= 64) { size_t num_blocks; unsigned char tmp[16]; num_blocks = (len >> 4) & ~(size_t)3; memcpy(tmp, buf + (num_blocks << 4) - 16, 16); switch (ctx->num_rounds) { case 10: cbcdec_128(ctx->skey.skni, iv, buf, num_blocks); break; case 12: cbcdec_192(ctx->skey.skni, iv, buf, num_blocks); break; default: cbcdec_256(ctx->skey.skni, iv, buf, num_blocks); break; } buf += num_blocks << 4; len &= 63; memcpy(iv, tmp, 16); } if (len > 0) { unsigned char tmp[64]; memcpy(tmp, buf, len); memset(tmp + len, 0, (sizeof tmp) - len); switch (ctx->num_rounds) { case 10: cbcdec_128(ctx->skey.skni, iv, tmp, 4); break; case 12: cbcdec_192(ctx->skey.skni, iv, tmp, 4); break; default: cbcdec_256(ctx->skey.skni, iv, tmp, 4); break; } memcpy(buf, tmp, len); } memcpy(iv, nextiv, 16); } /* see bearssl_block.h */ const br_block_cbcdec_class br_aes_pwr8_cbcdec_vtable = { sizeof(br_aes_pwr8_cbcdec_keys), 16, 4, (void (*)(const br_block_cbcdec_class **, const void *, size_t)) &br_aes_pwr8_cbcdec_init, (void (*)(const br_block_cbcdec_class *const *, void *, void *, size_t)) &br_aes_pwr8_cbcdec_run }; /* see bearssl_block.h */ const br_block_cbcdec_class * br_aes_pwr8_cbcdec_get_vtable(void) { return br_aes_pwr8_supported() ? &br_aes_pwr8_cbcdec_vtable : NULL; } #else /* see bearssl_block.h */ const br_block_cbcdec_class * br_aes_pwr8_cbcdec_get_vtable(void) { return NULL; } #endif