/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifdef FREEBL_NO_DEPEND #include "stubs.h" #endif #include "blapii.h" #include "blapit.h" #include "gcm.h" #include "secerr.h" #include "prtypes.h" #if defined(IS_LITTLE_ENDIAN) #include PRBool platform_ghash_support() { return arm_neon_support(); } SECStatus gcm_HashWrite_hw(gcmHashContext *ghash, unsigned char *outbuf) { vst1_u8(outbuf, vrev64_u8(vcreate_u8(ghash->x_high))); vst1_u8(outbuf + 8, vrev64_u8(vcreate_u8(ghash->x_low))); return SECSuccess; } /* Carry-less multiplication. a * b = ret. */ static inline uint8x16_t clmul(const uint8x8_t a, const uint8x8_t b) { uint8x16_t d, e, f, g, h, i, j, k, l, m, n; uint8x8_t t_high, t_low; uint8x16_t t0, t1, t2, t3; const uint8x8_t k16 = vcreate_u8(0xffff); const uint8x8_t k32 = vcreate_u8(0xffffffff); const uint8x8_t k48 = vcreate_u8(0xffffffffffff); // D = A * B d = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(a), vreinterpret_p8_u8(b))); // E = A * B1 e = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(a), vreinterpret_p8_u8(vext_u8(b, b, 1)))); // F = A1 * B f = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(vext_u8(a, a, 1)), vreinterpret_p8_u8(b))); // G = A * B2 g = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(a), vreinterpret_p8_u8(vext_u8(b, b, 2)))); // H = A2 * B h = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(vext_u8(a, a, 2)), vreinterpret_p8_u8(b))); // I = A * B3 i = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(a), vreinterpret_p8_u8(vext_u8(b, b, 3)))); // J = A3 * B j = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(vext_u8(a, a, 3)), vreinterpret_p8_u8(b))); // K = A * B4 k = vreinterpretq_u8_p16(vmull_p8(vreinterpret_p8_u8(a), vreinterpret_p8_u8(vext_u8(b, b, 4)))); // L = E + F l = veorq_u8(e, f); // M = G + H m = veorq_u8(g, h); // N = I + J n = veorq_u8(i, j); // t0 = (L) (P0 + P1) << 8 t_high = vget_high_u8(l); t_low = vget_low_u8(l); t_low = veor_u8(t_low, t_high); t_high = vand_u8(t_high, k48); t_low = veor_u8(t_low, t_high); t0 = vcombine_u8(t_low, t_high); t0 = vextq_u8(t0, t0, 15); // t1 = (M) (P2 + P3) << 16 t_high = vget_high_u8(m); t_low = vget_low_u8(m); t_low = veor_u8(t_low, t_high); t_high = vand_u8(t_high, k32); t_low = veor_u8(t_low, t_high); t1 = vcombine_u8(t_low, t_high); t1 = vextq_u8(t1, t1, 14); // t2 = (N) (P4 + P5) << 24 t_high = vget_high_u8(n); t_low = vget_low_u8(n); t_low = veor_u8(t_low, t_high); t_high = vand_u8(t_high, k16); t_low = veor_u8(t_low, t_high); t2 = vcombine_u8(t_low, t_high); t2 = vextq_u8(t2, t2, 13); // t3 = (K) (P6 + P7) << 32 t_high = vget_high_u8(k); t_low = vget_low_u8(k); t_low = veor_u8(t_low, t_high); t_high = vdup_n_u8(0); t3 = vcombine_u8(t_low, t_high); t3 = vextq_u8(t3, t3, 12); t0 = veorq_u8(t0, t1); t2 = veorq_u8(t2, t3); return veorq_u8(veorq_u8(d, t0), t2); } SECStatus gcm_HashMult_hw(gcmHashContext *ghash, const unsigned char *buf, unsigned int count) { const uint8x8_t h_low = vcreate_u8(ghash->h_low); const uint8x8_t h_high = vcreate_u8(ghash->h_high); uint8x16_t ci; uint8x8_t ci_low; uint8x8_t ci_high; uint8x16_t z0, z2, z1a; uint8x16_t z_high, z_low; uint8x16_t t; int64x2_t t1, t2, t3; uint64x2_t z_low_l, z_low_r, z_high_l, z_high_r; size_t i; ci = vcombine_u8(vcreate_u8(ghash->x_low), vcreate_u8(ghash->x_high)); for (i = 0; i < count; i++, buf += 16) { ci = veorq_u8(ci, vcombine_u8(vrev64_u8(vld1_u8(buf + 8)), vrev64_u8(vld1_u8(buf)))); ci_high = vget_high_u8(ci); ci_low = vget_low_u8(ci); /* Do binary mult ghash->X = C * ghash->H (Karatsuba). */ z0 = clmul(ci_low, h_low); z2 = clmul(ci_high, h_high); z1a = clmul(veor_u8(ci_high, ci_low), veor_u8(h_high, h_low)); z1a = veorq_u8(z0, z1a); z1a = veorq_u8(z2, z1a); z_high = vcombine_u8(veor_u8(vget_low_u8(z2), vget_high_u8(z1a)), vget_high_u8(z2)); z_low = vcombine_u8(vget_low_u8(z0), veor_u8(vget_high_u8(z0), vget_low_u8(z1a))); /* Shift one (multiply by x) as gcm spec is stupid. */ z_low_l = vshlq_n_u64(vreinterpretq_u64_u8(z_low), 1); z_low_r = vshrq_n_u64(vreinterpretq_u64_u8(z_low), 63); z_high_l = vshlq_n_u64(vreinterpretq_u64_u8(z_high), 1); z_high_r = vshrq_n_u64(vreinterpretq_u64_u8(z_high), 63); z_low = vreinterpretq_u8_u64( vcombine_u64(vget_low_u64(z_low_l), vorr_u64(vget_high_u64(z_low_l), vget_low_u64(z_low_r)))); z_high = vreinterpretq_u8_u64( vcombine_u64(vorr_u64(vget_low_u64(z_high_l), vget_high_u64(z_low_r)), vorr_u64(vget_high_u64(z_high_l), vget_low_u64(z_high_r)))); /* Reduce */ t1 = vshlq_n_s64(vreinterpretq_s64_u8(z_low), 57); t2 = vshlq_n_s64(vreinterpretq_s64_u8(z_low), 62); t3 = vshlq_n_s64(vreinterpretq_s64_u8(z_low), 63); t = vreinterpretq_u8_s64(veorq_s64(t1, veorq_s64(t2, t3))); z_low = vcombine_u8(vget_low_u8(z_low), veor_u8(vget_high_u8(z_low), vget_low_u8(t))); z_high = vcombine_u8(veor_u8(vget_low_u8(z_high), vget_high_u8(t)), vget_high_u8(z_high)); t = vreinterpretq_u8_u64(vshrq_n_u64(vreinterpretq_u64_u8(z_low), 1)); z_high = veorq_u8(z_high, z_low); z_low = veorq_u8(z_low, t); t = vreinterpretq_u8_u64(vshrq_n_u64(vreinterpretq_u64_u8(t), 6)); z_low = vreinterpretq_u8_u64( vshrq_n_u64(vreinterpretq_u64_u8(z_low), 1)); z_low = veorq_u8(z_low, z_high); ci = veorq_u8(z_low, t); } vst1_u8((uint8_t *)&ghash->x_high, vget_high_u8(ci)); vst1_u8((uint8_t *)&ghash->x_low, vget_low_u8(ci)); return SECSuccess; } SECStatus gcm_HashInit_hw(gcmHashContext *ghash) { ghash->ghash_mul = gcm_HashMult_hw; ghash->x_low = 0; ghash->x_high = 0; ghash->hw = PR_TRUE; return SECSuccess; } SECStatus gcm_HashZeroX_hw(gcmHashContext *ghash) { ghash->x_low = 0; ghash->x_high = 0; return SECSuccess; } #endif /* IS_LITTLE_ENDIAN */