// SPDX-License-Identifier: GPL-2.0 OR MIT /* * Copyright (C) 2020 Jason A. Donenfeld . All Rights Reserved. * Copyright (c) 2016-2020 INRIA, CMU and Microsoft Corporation */ #include #include #include #include #include #include #include #include #include static __always_inline u64 eq_mask(u64 a, u64 b) { u64 x = a ^ b; u64 minus_x = ~x + (u64)1U; u64 x_or_minus_x = x | minus_x; u64 xnx = x_or_minus_x >> (u32)63U; return xnx - (u64)1U; } static __always_inline u64 gte_mask(u64 a, u64 b) { u64 x = a; u64 y = b; u64 x_xor_y = x ^ y; u64 x_sub_y = x - y; u64 x_sub_y_xor_y = x_sub_y ^ y; u64 q = x_xor_y | x_sub_y_xor_y; u64 x_xor_q = x ^ q; u64 x_xor_q_ = x_xor_q >> (u32)63U; return x_xor_q_ - (u64)1U; } /* Computes the addition of four-element f1 with value in f2 * and returns the carry (if any) */ static inline u64 add_scalar(u64 *out, const u64 *f1, u64 f2) { u64 carry_r; asm volatile( /* Clear registers to propagate the carry bit */ " xor %%r8d, %%r8d;" " xor %%r9d, %%r9d;" " xor %%r10d, %%r10d;" " xor %%r11d, %%r11d;" " xor %k1, %k1;" /* Begin addition chain */ " addq 0(%3), %0;" " movq %0, 0(%2);" " adcxq 8(%3), %%r8;" " movq %%r8, 8(%2);" " adcxq 16(%3), %%r9;" " movq %%r9, 16(%2);" " adcxq 24(%3), %%r10;" " movq %%r10, 24(%2);" /* Return the carry bit in a register */ " adcx %%r11, %1;" : "+&r" (f2), "=&r" (carry_r) : "r" (out), "r" (f1) : "%r8", "%r9", "%r10", "%r11", "memory", "cc" ); return carry_r; } /* Computes the field addition of two field elements */ static inline void fadd(u64 *out, const u64 *f1, const u64 *f2) { asm volatile( /* Compute the raw addition of f1 + f2 */ " movq 0(%0), %%r8;" " addq 0(%2), %%r8;" " movq 8(%0), %%r9;" " adcxq 8(%2), %%r9;" " movq 16(%0), %%r10;" " adcxq 16(%2), %%r10;" " movq 24(%0), %%r11;" " adcxq 24(%2), %%r11;" /* Wrap the result back into the field */ /* Step 1: Compute carry*38 */ " mov $0, %%rax;" " mov $38, %0;" " cmovc %0, %%rax;" /* Step 2: Add carry*38 to the original sum */ " xor %%ecx, %%ecx;" " add %%rax, %%r8;" " adcx %%rcx, %%r9;" " movq %%r9, 8(%1);" " adcx %%rcx, %%r10;" " movq %%r10, 16(%1);" " adcx %%rcx, %%r11;" " movq %%r11, 24(%1);" /* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */ " mov $0, %%rax;" " cmovc %0, %%rax;" " add %%rax, %%r8;" " movq %%r8, 0(%1);" : "+&r" (f2) : "r" (out), "r" (f1) : "%rax", "%rcx", "%r8", "%r9", "%r10", "%r11", "memory", "cc" ); } /* Computes the field substraction of two field elements */ static inline void fsub(u64 *out, const u64 *f1, const u64 *f2) { asm volatile( /* Compute the raw substraction of f1-f2 */ " movq 0(%1), %%r8;" " subq 0(%2), %%r8;" " movq 8(%1), %%r9;" " sbbq 8(%2), %%r9;" " movq 16(%1), %%r10;" " sbbq 16(%2), %%r10;" " movq 24(%1), %%r11;" " sbbq 24(%2), %%r11;" /* Wrap the result back into the field */ /* Step 1: Compute carry*38 */ " mov $0, %%rax;" " mov $38, %%rcx;" " cmovc %%rcx, %%rax;" /* Step 2: Substract carry*38 from the original difference */ " sub %%rax, %%r8;" " sbb $0, %%r9;" " sbb $0, %%r10;" " sbb $0, %%r11;" /* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */ " mov $0, %%rax;" " cmovc %%rcx, %%rax;" " sub %%rax, %%r8;" /* Store the result */ " movq %%r8, 0(%0);" " movq %%r9, 8(%0);" " movq %%r10, 16(%0);" " movq %%r11, 24(%0);" : : "r" (out), "r" (f1), "r" (f2) : "%rax", "%rcx", "%r8", "%r9", "%r10", "%r11", "memory", "cc" ); } /* Computes a field multiplication: out <- f1 * f2 * Uses the 8-element buffer tmp for intermediate results */ static inline void fmul(u64 *out, const u64 *f1, const u64 *f2, u64 *tmp) { asm volatile( /* Compute the raw multiplication: tmp <- src1 * src2 */ /* Compute src1[0] * src2 */ " movq 0(%1), %%rdx;" " mulxq 0(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " movq %%r8, 0(%0);" " mulxq 8(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " movq %%r10, 8(%0);" " mulxq 16(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " mulxq 24(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " mov $0, %%rax;" " adox %%rdx, %%rax;" /* Compute src1[1] * src2 */ " movq 8(%1), %%rdx;" " mulxq 0(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " adcxq 8(%0), %%r8;" " movq %%r8, 8(%0);" " mulxq 8(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " adcx %%rbx, %%r10;" " movq %%r10, 16(%0);" " mulxq 16(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " adcx %%r14, %%rbx;" " mov $0, %%r8;" " mulxq 24(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " adcx %%rax, %%r14;" " mov $0, %%rax;" " adox %%rdx, %%rax;" " adcx %%r8, %%rax;" /* Compute src1[2] * src2 */ " movq 16(%1), %%rdx;" " mulxq 0(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " adcxq 16(%0), %%r8;" " movq %%r8, 16(%0);" " mulxq 8(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " adcx %%rbx, %%r10;" " movq %%r10, 24(%0);" " mulxq 16(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " adcx %%r14, %%rbx;" " mov $0, %%r8;" " mulxq 24(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " adcx %%rax, %%r14;" " mov $0, %%rax;" " adox %%rdx, %%rax;" " adcx %%r8, %%rax;" /* Compute src1[3] * src2 */ " movq 24(%1), %%rdx;" " mulxq 0(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " adcxq 24(%0), %%r8;" " movq %%r8, 24(%0);" " mulxq 8(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " adcx %%rbx, %%r10;" " movq %%r10, 32(%0);" " mulxq 16(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " adcx %%r14, %%rbx;" " movq %%rbx, 40(%0);" " mov $0, %%r8;" " mulxq 24(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " adcx %%rax, %%r14;" " movq %%r14, 48(%0);" " mov $0, %%rax;" " adox %%rdx, %%rax;" " adcx %%r8, %%rax;" " movq %%rax, 56(%0);" /* Line up pointers */ " mov %0, %1;" " mov %2, %0;" /* Wrap the result back into the field */ /* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */ " mov $38, %%rdx;" " mulxq 32(%1), %%r8, %%r13;" " xor %k3, %k3;" " adoxq 0(%1), %%r8;" " mulxq 40(%1), %%r9, %%rbx;" " adcx %%r13, %%r9;" " adoxq 8(%1), %%r9;" " mulxq 48(%1), %%r10, %%r13;" " adcx %%rbx, %%r10;" " adoxq 16(%1), %%r10;" " mulxq 56(%1), %%r11, %%rax;" " adcx %%r13, %%r11;" " adoxq 24(%1), %%r11;" " adcx %3, %%rax;" " adox %3, %%rax;" " imul %%rdx, %%rax;" /* Step 2: Fold the carry back into dst */ " add %%rax, %%r8;" " adcx %3, %%r9;" " movq %%r9, 8(%0);" " adcx %3, %%r10;" " movq %%r10, 16(%0);" " adcx %3, %%r11;" " movq %%r11, 24(%0);" /* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */ " mov $0, %%rax;" " cmovc %%rdx, %%rax;" " add %%rax, %%r8;" " movq %%r8, 0(%0);" : "+&r" (tmp), "+&r" (f1), "+&r" (out), "+&r" (f2) : : "%rax", "%rdx", "%r8", "%r9", "%r10", "%r11", "%rbx", "%r13", "%r14", "memory", "cc" ); } /* Computes two field multiplications: * out[0] <- f1[0] * f2[0] * out[1] <- f1[1] * f2[1] * Uses the 16-element buffer tmp for intermediate results. */ static inline void fmul2(u64 *out, const u64 *f1, const u64 *f2, u64 *tmp) { asm volatile( /* Compute the raw multiplication tmp[0] <- f1[0] * f2[0] */ /* Compute src1[0] * src2 */ " movq 0(%1), %%rdx;" " mulxq 0(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " movq %%r8, 0(%0);" " mulxq 8(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " movq %%r10, 8(%0);" " mulxq 16(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " mulxq 24(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " mov $0, %%rax;" " adox %%rdx, %%rax;" /* Compute src1[1] * src2 */ " movq 8(%1), %%rdx;" " mulxq 0(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " adcxq 8(%0), %%r8;" " movq %%r8, 8(%0);" " mulxq 8(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " adcx %%rbx, %%r10;" " movq %%r10, 16(%0);" " mulxq 16(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " adcx %%r14, %%rbx;" " mov $0, %%r8;" " mulxq 24(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " adcx %%rax, %%r14;" " mov $0, %%rax;" " adox %%rdx, %%rax;" " adcx %%r8, %%rax;" /* Compute src1[2] * src2 */ " movq 16(%1), %%rdx;" " mulxq 0(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " adcxq 16(%0), %%r8;" " movq %%r8, 16(%0);" " mulxq 8(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " adcx %%rbx, %%r10;" " movq %%r10, 24(%0);" " mulxq 16(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " adcx %%r14, %%rbx;" " mov $0, %%r8;" " mulxq 24(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " adcx %%rax, %%r14;" " mov $0, %%rax;" " adox %%rdx, %%rax;" " adcx %%r8, %%rax;" /* Compute src1[3] * src2 */ " movq 24(%1), %%rdx;" " mulxq 0(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " adcxq 24(%0), %%r8;" " movq %%r8, 24(%0);" " mulxq 8(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " adcx %%rbx, %%r10;" " movq %%r10, 32(%0);" " mulxq 16(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " adcx %%r14, %%rbx;" " movq %%rbx, 40(%0);" " mov $0, %%r8;" " mulxq 24(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " adcx %%rax, %%r14;" " movq %%r14, 48(%0);" " mov $0, %%rax;" " adox %%rdx, %%rax;" " adcx %%r8, %%rax;" " movq %%rax, 56(%0);" /* Compute the raw multiplication tmp[1] <- f1[1] * f2[1] */ /* Compute src1[0] * src2 */ " movq 32(%1), %%rdx;" " mulxq 32(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " movq %%r8, 64(%0);" " mulxq 40(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " movq %%r10, 72(%0);" " mulxq 48(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " mulxq 56(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " mov $0, %%rax;" " adox %%rdx, %%rax;" /* Compute src1[1] * src2 */ " movq 40(%1), %%rdx;" " mulxq 32(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " adcxq 72(%0), %%r8;" " movq %%r8, 72(%0);" " mulxq 40(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " adcx %%rbx, %%r10;" " movq %%r10, 80(%0);" " mulxq 48(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " adcx %%r14, %%rbx;" " mov $0, %%r8;" " mulxq 56(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " adcx %%rax, %%r14;" " mov $0, %%rax;" " adox %%rdx, %%rax;" " adcx %%r8, %%rax;" /* Compute src1[2] * src2 */ " movq 48(%1), %%rdx;" " mulxq 32(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " adcxq 80(%0), %%r8;" " movq %%r8, 80(%0);" " mulxq 40(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " adcx %%rbx, %%r10;" " movq %%r10, 88(%0);" " mulxq 48(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " adcx %%r14, %%rbx;" " mov $0, %%r8;" " mulxq 56(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " adcx %%rax, %%r14;" " mov $0, %%rax;" " adox %%rdx, %%rax;" " adcx %%r8, %%rax;" /* Compute src1[3] * src2 */ " movq 56(%1), %%rdx;" " mulxq 32(%3), %%r8, %%r9;" " xor %%r10d, %%r10d;" " adcxq 88(%0), %%r8;" " movq %%r8, 88(%0);" " mulxq 40(%3), %%r10, %%r11;" " adox %%r9, %%r10;" " adcx %%rbx, %%r10;" " movq %%r10, 96(%0);" " mulxq 48(%3), %%rbx, %%r13;" " adox %%r11, %%rbx;" " adcx %%r14, %%rbx;" " movq %%rbx, 104(%0);" " mov $0, %%r8;" " mulxq 56(%3), %%r14, %%rdx;" " adox %%r13, %%r14;" " adcx %%rax, %%r14;" " movq %%r14, 112(%0);" " mov $0, %%rax;" " adox %%rdx, %%rax;" " adcx %%r8, %%rax;" " movq %%rax, 120(%0);" /* Line up pointers */ " mov %0, %1;" " mov %2, %0;" /* Wrap the results back into the field */ /* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */ " mov $38, %%rdx;" " mulxq 32(%1), %%r8, %%r13;" " xor %k3, %k3;" " adoxq 0(%1), %%r8;" " mulxq 40(%1), %%r9, %%rbx;" " adcx %%r13, %%r9;" " adoxq 8(%1), %%r9;" " mulxq 48(%1), %%r10, %%r13;" " adcx %%rbx, %%r10;" " adoxq 16(%1), %%r10;" " mulxq 56(%1), %%r11, %%rax;" " adcx %%r13, %%r11;" " adoxq 24(%1), %%r11;" " adcx %3, %%rax;" " adox %3, %%rax;" " imul %%rdx, %%rax;" /* Step 2: Fold the carry back into dst */ " add %%rax, %%r8;" " adcx %3, %%r9;" " movq %%r9, 8(%0);" " adcx %3, %%r10;" " movq %%r10, 16(%0);" " adcx %3, %%r11;" " movq %%r11, 24(%0);" /* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */ " mov $0, %%rax;" " cmovc %%rdx, %%rax;" " add %%rax, %%r8;" " movq %%r8, 0(%0);" /* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */ " mov $38, %%rdx;" " mulxq 96(%1), %%r8, %%r13;" " xor %k3, %k3;" " adoxq 64(%1), %%r8;" " mulxq 104(%1), %%r9, %%rbx;" " adcx %%r13, %%r9;" " adoxq 72(%1), %%r9;" " mulxq 112(%1), %%r10, %%r13;" " adcx %%rbx, %%r10;" " adoxq 80(%1), %%r10;" " mulxq 120(%1), %%r11, %%rax;" " adcx %%r13, %%r11;" " adoxq 88(%1), %%r11;" " adcx %3, %%rax;" " adox %3, %%rax;" " imul %%rdx, %%rax;" /* Step 2: Fold the carry back into dst */ " add %%rax, %%r8;" " adcx %3, %%r9;" " movq %%r9, 40(%0);" " adcx %3, %%r10;" " movq %%r10, 48(%0);" " adcx %3, %%r11;" " movq %%r11, 56(%0);" /* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */ " mov $0, %%rax;" " cmovc %%rdx, %%rax;" " add %%rax, %%r8;" " movq %%r8, 32(%0);" : "+&r" (tmp), "+&r" (f1), "+&r" (out), "+&r" (f2) : : "%rax", "%rdx", "%r8", "%r9", "%r10", "%r11", "%rbx", "%r13", "%r14", "memory", "cc" ); } /* Computes the field multiplication of four-element f1 with value in f2 */ static inline void fmul_scalar(u64 *out, const u64 *f1, u64 f2) { register u64 f2_r asm("rdx") = f2; asm volatile( /* Compute the raw multiplication of f1*f2 */ " mulxq 0(%2), %%r8, %%rcx;" /* f1[0]*f2 */ " mulxq 8(%2), %%r9, %%rbx;" /* f1[1]*f2 */ " add %%rcx, %%r9;" " mov $0, %%rcx;" " mulxq 16(%2), %%r10, %%r13;" /* f1[2]*f2 */ " adcx %%rbx, %%r10;" " mulxq 24(%2), %%r11, %%rax;" /* f1[3]*f2 */ " adcx %%r13, %%r11;" " adcx %%rcx, %%rax;" /* Wrap the result back into the field */ /* Step 1: Compute carry*38 */ " mov $38, %%rdx;" " imul %%rdx, %%rax;" /* Step 2: Fold the carry back into dst */ " add %%rax, %%r8;" " adcx %%rcx, %%r9;" " movq %%r9, 8(%1);" " adcx %%rcx, %%r10;" " movq %%r10, 16(%1);" " adcx %%rcx, %%r11;" " movq %%r11, 24(%1);" /* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */ " mov $0, %%rax;" " cmovc %%rdx, %%rax;" " add %%rax, %%r8;" " movq %%r8, 0(%1);" : "+&r" (f2_r) : "r" (out), "r" (f1) : "%rax", "%rcx", "%r8", "%r9", "%r10", "%r11", "%rbx", "%r13", "memory", "cc" ); } /* Computes p1 <- bit ? p2 : p1 in constant time */ static inline void cswap2(u64 bit, const u64 *p1, const u64 *p2) { asm volatile( /* Invert the polarity of bit to match cmov expectations */ " add $18446744073709551615, %0;" /* cswap p1[0], p2[0] */ " movq 0(%1), %%r8;" " movq 0(%2), %%r9;" " mov %%r8, %%r10;" " cmovc %%r9, %%r8;" " cmovc %%r10, %%r9;" " movq %%r8, 0(%1);" " movq %%r9, 0(%2);" /* cswap p1[1], p2[1] */ " movq 8(%1), %%r8;" " movq 8(%2), %%r9;" " mov %%r8, %%r10;" " cmovc %%r9, %%r8;" " cmovc %%r10, %%r9;" " movq %%r8, 8(%1);" " movq %%r9, 8(%2);" /* cswap p1[2], p2[2] */ " movq 16(%1), %%r8;" " movq 16(%2), %%r9;" " mov %%r8, %%r10;" " cmovc %%r9, %%r8;" " cmovc %%r10, %%r9;" " movq %%r8, 16(%1);" " movq %%r9, 16(%2);" /* cswap p1[3], p2[3] */ " movq 24(%1), %%r8;" " movq 24(%2), %%r9;" " mov %%r8, %%r10;" " cmovc %%r9, %%r8;" " cmovc %%r10, %%r9;" " movq %%r8, 24(%1);" " movq %%r9, 24(%2);" /* cswap p1[4], p2[4] */ " movq 32(%1), %%r8;" " movq 32(%2), %%r9;" " mov %%r8, %%r10;" " cmovc %%r9, %%r8;" " cmovc %%r10, %%r9;" " movq %%r8, 32(%1);" " movq %%r9, 32(%2);" /* cswap p1[5], p2[5] */ " movq 40(%1), %%r8;" " movq 40(%2), %%r9;" " mov %%r8, %%r10;" " cmovc %%r9, %%r8;" " cmovc %%r10, %%r9;" " movq %%r8, 40(%1);" " movq %%r9, 40(%2);" /* cswap p1[6], p2[6] */ " movq 48(%1), %%r8;" " movq 48(%2), %%r9;" " mov %%r8, %%r10;" " cmovc %%r9, %%r8;" " cmovc %%r10, %%r9;" " movq %%r8, 48(%1);" " movq %%r9, 48(%2);" /* cswap p1[7], p2[7] */ " movq 56(%1), %%r8;" " movq 56(%2), %%r9;" " mov %%r8, %%r10;" " cmovc %%r9, %%r8;" " cmovc %%r10, %%r9;" " movq %%r8, 56(%1);" " movq %%r9, 56(%2);" : "+&r" (bit) : "r" (p1), "r" (p2) : "%r8", "%r9", "%r10", "memory", "cc" ); } /* Computes the square of a field element: out <- f * f * Uses the 8-element buffer tmp for intermediate results */ static inline void fsqr(u64 *out, const u64 *f, u64 *tmp) { asm volatile( /* Compute the raw multiplication: tmp <- f * f */ /* Step 1: Compute all partial products */ " movq 0(%1), %%rdx;" /* f[0] */ " mulxq 8(%1), %%r8, %%r14;" " xor %%r15d, %%r15d;" /* f[1]*f[0] */ " mulxq 16(%1), %%r9, %%r10;" " adcx %%r14, %%r9;" /* f[2]*f[0] */ " mulxq 24(%1), %%rax, %%rcx;" " adcx %%rax, %%r10;" /* f[3]*f[0] */ " movq 24(%1), %%rdx;" /* f[3] */ " mulxq 8(%1), %%r11, %%rbx;" " adcx %%rcx, %%r11;" /* f[1]*f[3] */ " mulxq 16(%1), %%rax, %%r13;" " adcx %%rax, %%rbx;" /* f[2]*f[3] */ " movq 8(%1), %%rdx;" " adcx %%r15, %%r13;" /* f1 */ " mulxq 16(%1), %%rax, %%rcx;" " mov $0, %%r14;" /* f[2]*f[1] */ /* Step 2: Compute two parallel carry chains */ " xor %%r15d, %%r15d;" " adox %%rax, %%r10;" " adcx %%r8, %%r8;" " adox %%rcx, %%r11;" " adcx %%r9, %%r9;" " adox %%r15, %%rbx;" " adcx %%r10, %%r10;" " adox %%r15, %%r13;" " adcx %%r11, %%r11;" " adox %%r15, %%r14;" " adcx %%rbx, %%rbx;" " adcx %%r13, %%r13;" " adcx %%r14, %%r14;" /* Step 3: Compute intermediate squares */ " movq 0(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[0]^2 */ " movq %%rax, 0(%0);" " add %%rcx, %%r8;" " movq %%r8, 8(%0);" " movq 8(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[1]^2 */ " adcx %%rax, %%r9;" " movq %%r9, 16(%0);" " adcx %%rcx, %%r10;" " movq %%r10, 24(%0);" " movq 16(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[2]^2 */ " adcx %%rax, %%r11;" " movq %%r11, 32(%0);" " adcx %%rcx, %%rbx;" " movq %%rbx, 40(%0);" " movq 24(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[3]^2 */ " adcx %%rax, %%r13;" " movq %%r13, 48(%0);" " adcx %%rcx, %%r14;" " movq %%r14, 56(%0);" /* Line up pointers */ " mov %0, %1;" " mov %2, %0;" /* Wrap the result back into the field */ /* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */ " mov $38, %%rdx;" " mulxq 32(%1), %%r8, %%r13;" " xor %%ecx, %%ecx;" " adoxq 0(%1), %%r8;" " mulxq 40(%1), %%r9, %%rbx;" " adcx %%r13, %%r9;" " adoxq 8(%1), %%r9;" " mulxq 48(%1), %%r10, %%r13;" " adcx %%rbx, %%r10;" " adoxq 16(%1), %%r10;" " mulxq 56(%1), %%r11, %%rax;" " adcx %%r13, %%r11;" " adoxq 24(%1), %%r11;" " adcx %%rcx, %%rax;" " adox %%rcx, %%rax;" " imul %%rdx, %%rax;" /* Step 2: Fold the carry back into dst */ " add %%rax, %%r8;" " adcx %%rcx, %%r9;" " movq %%r9, 8(%0);" " adcx %%rcx, %%r10;" " movq %%r10, 16(%0);" " adcx %%rcx, %%r11;" " movq %%r11, 24(%0);" /* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */ " mov $0, %%rax;" " cmovc %%rdx, %%rax;" " add %%rax, %%r8;" " movq %%r8, 0(%0);" : "+&r" (tmp), "+&r" (f), "+&r" (out) : : "%rax", "%rcx", "%rdx", "%r8", "%r9", "%r10", "%r11", "%rbx", "%r13", "%r14", "%r15", "memory", "cc" ); } /* Computes two field squarings: * out[0] <- f[0] * f[0] * out[1] <- f[1] * f[1] * Uses the 16-element buffer tmp for intermediate results */ static inline void fsqr2(u64 *out, const u64 *f, u64 *tmp) { asm volatile( /* Step 1: Compute all partial products */ " movq 0(%1), %%rdx;" /* f[0] */ " mulxq 8(%1), %%r8, %%r14;" " xor %%r15d, %%r15d;" /* f[1]*f[0] */ " mulxq 16(%1), %%r9, %%r10;" " adcx %%r14, %%r9;" /* f[2]*f[0] */ " mulxq 24(%1), %%rax, %%rcx;" " adcx %%rax, %%r10;" /* f[3]*f[0] */ " movq 24(%1), %%rdx;" /* f[3] */ " mulxq 8(%1), %%r11, %%rbx;" " adcx %%rcx, %%r11;" /* f[1]*f[3] */ " mulxq 16(%1), %%rax, %%r13;" " adcx %%rax, %%rbx;" /* f[2]*f[3] */ " movq 8(%1), %%rdx;" " adcx %%r15, %%r13;" /* f1 */ " mulxq 16(%1), %%rax, %%rcx;" " mov $0, %%r14;" /* f[2]*f[1] */ /* Step 2: Compute two parallel carry chains */ " xor %%r15d, %%r15d;" " adox %%rax, %%r10;" " adcx %%r8, %%r8;" " adox %%rcx, %%r11;" " adcx %%r9, %%r9;" " adox %%r15, %%rbx;" " adcx %%r10, %%r10;" " adox %%r15, %%r13;" " adcx %%r11, %%r11;" " adox %%r15, %%r14;" " adcx %%rbx, %%rbx;" " adcx %%r13, %%r13;" " adcx %%r14, %%r14;" /* Step 3: Compute intermediate squares */ " movq 0(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[0]^2 */ " movq %%rax, 0(%0);" " add %%rcx, %%r8;" " movq %%r8, 8(%0);" " movq 8(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[1]^2 */ " adcx %%rax, %%r9;" " movq %%r9, 16(%0);" " adcx %%rcx, %%r10;" " movq %%r10, 24(%0);" " movq 16(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[2]^2 */ " adcx %%rax, %%r11;" " movq %%r11, 32(%0);" " adcx %%rcx, %%rbx;" " movq %%rbx, 40(%0);" " movq 24(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[3]^2 */ " adcx %%rax, %%r13;" " movq %%r13, 48(%0);" " adcx %%rcx, %%r14;" " movq %%r14, 56(%0);" /* Step 1: Compute all partial products */ " movq 32(%1), %%rdx;" /* f[0] */ " mulxq 40(%1), %%r8, %%r14;" " xor %%r15d, %%r15d;" /* f[1]*f[0] */ " mulxq 48(%1), %%r9, %%r10;" " adcx %%r14, %%r9;" /* f[2]*f[0] */ " mulxq 56(%1), %%rax, %%rcx;" " adcx %%rax, %%r10;" /* f[3]*f[0] */ " movq 56(%1), %%rdx;" /* f[3] */ " mulxq 40(%1), %%r11, %%rbx;" " adcx %%rcx, %%r11;" /* f[1]*f[3] */ " mulxq 48(%1), %%rax, %%r13;" " adcx %%rax, %%rbx;" /* f[2]*f[3] */ " movq 40(%1), %%rdx;" " adcx %%r15, %%r13;" /* f1 */ " mulxq 48(%1), %%rax, %%rcx;" " mov $0, %%r14;" /* f[2]*f[1] */ /* Step 2: Compute two parallel carry chains */ " xor %%r15d, %%r15d;" " adox %%rax, %%r10;" " adcx %%r8, %%r8;" " adox %%rcx, %%r11;" " adcx %%r9, %%r9;" " adox %%r15, %%rbx;" " adcx %%r10, %%r10;" " adox %%r15, %%r13;" " adcx %%r11, %%r11;" " adox %%r15, %%r14;" " adcx %%rbx, %%rbx;" " adcx %%r13, %%r13;" " adcx %%r14, %%r14;" /* Step 3: Compute intermediate squares */ " movq 32(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[0]^2 */ " movq %%rax, 64(%0);" " add %%rcx, %%r8;" " movq %%r8, 72(%0);" " movq 40(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[1]^2 */ " adcx %%rax, %%r9;" " movq %%r9, 80(%0);" " adcx %%rcx, %%r10;" " movq %%r10, 88(%0);" " movq 48(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[2]^2 */ " adcx %%rax, %%r11;" " movq %%r11, 96(%0);" " adcx %%rcx, %%rbx;" " movq %%rbx, 104(%0);" " movq 56(%1), %%rdx;" " mulx %%rdx, %%rax, %%rcx;" /* f[3]^2 */ " adcx %%rax, %%r13;" " movq %%r13, 112(%0);" " adcx %%rcx, %%r14;" " movq %%r14, 120(%0);" /* Line up pointers */ " mov %0, %1;" " mov %2, %0;" /* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */ " mov $38, %%rdx;" " mulxq 32(%1), %%r8, %%r13;" " xor %%ecx, %%ecx;" " adoxq 0(%1), %%r8;" " mulxq 40(%1), %%r9, %%rbx;" " adcx %%r13, %%r9;" " adoxq 8(%1), %%r9;" " mulxq 48(%1), %%r10, %%r13;" " adcx %%rbx, %%r10;" " adoxq 16(%1), %%r10;" " mulxq 56(%1), %%r11, %%rax;" " adcx %%r13, %%r11;" " adoxq 24(%1), %%r11;" " adcx %%rcx, %%rax;" " adox %%rcx, %%rax;" " imul %%rdx, %%rax;" /* Step 2: Fold the carry back into dst */ " add %%rax, %%r8;" " adcx %%rcx, %%r9;" " movq %%r9, 8(%0);" " adcx %%rcx, %%r10;" " movq %%r10, 16(%0);" " adcx %%rcx, %%r11;" " movq %%r11, 24(%0);" /* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */ " mov $0, %%rax;" " cmovc %%rdx, %%rax;" " add %%rax, %%r8;" " movq %%r8, 0(%0);" /* Step 1: Compute dst + carry == tmp_hi * 38 + tmp_lo */ " mov $38, %%rdx;" " mulxq 96(%1), %%r8, %%r13;" " xor %%ecx, %%ecx;" " adoxq 64(%1), %%r8;" " mulxq 104(%1), %%r9, %%rbx;" " adcx %%r13, %%r9;" " adoxq 72(%1), %%r9;" " mulxq 112(%1), %%r10, %%r13;" " adcx %%rbx, %%r10;" " adoxq 80(%1), %%r10;" " mulxq 120(%1), %%r11, %%rax;" " adcx %%r13, %%r11;" " adoxq 88(%1), %%r11;" " adcx %%rcx, %%rax;" " adox %%rcx, %%rax;" " imul %%rdx, %%rax;" /* Step 2: Fold the carry back into dst */ " add %%rax, %%r8;" " adcx %%rcx, %%r9;" " movq %%r9, 40(%0);" " adcx %%rcx, %%r10;" " movq %%r10, 48(%0);" " adcx %%rcx, %%r11;" " movq %%r11, 56(%0);" /* Step 3: Fold the carry bit back in; guaranteed not to carry at this point */ " mov $0, %%rax;" " cmovc %%rdx, %%rax;" " add %%rax, %%r8;" " movq %%r8, 32(%0);" : "+&r" (tmp), "+&r" (f), "+&r" (out) : : "%rax", "%rcx", "%rdx", "%r8", "%r9", "%r10", "%r11", "%rbx", "%r13", "%r14", "%r15", "memory", "cc" ); } static void point_add_and_double(u64 *q, u64 *p01_tmp1, u64 *tmp2) { u64 *nq = p01_tmp1; u64 *nq_p1 = p01_tmp1 + (u32)8U; u64 *tmp1 = p01_tmp1 + (u32)16U; u64 *x1 = q; u64 *x2 = nq; u64 *z2 = nq + (u32)4U; u64 *z3 = nq_p1 + (u32)4U; u64 *a = tmp1; u64 *b = tmp1 + (u32)4U; u64 *ab = tmp1; u64 *dc = tmp1 + (u32)8U; u64 *x3; u64 *z31; u64 *d0; u64 *c0; u64 *a1; u64 *b1; u64 *d; u64 *c; u64 *ab1; u64 *dc1; fadd(a, x2, z2); fsub(b, x2, z2); x3 = nq_p1; z31 = nq_p1 + (u32)4U; d0 = dc; c0 = dc + (u32)4U; fadd(c0, x3, z31); fsub(d0, x3, z31); fmul2(dc, dc, ab, tmp2); fadd(x3, d0, c0); fsub(z31, d0, c0); a1 = tmp1; b1 = tmp1 + (u32)4U; d = tmp1 + (u32)8U; c = tmp1 + (u32)12U; ab1 = tmp1; dc1 = tmp1 + (u32)8U; fsqr2(dc1, ab1, tmp2); fsqr2(nq_p1, nq_p1, tmp2); a1[0U] = c[0U]; a1[1U] = c[1U]; a1[2U] = c[2U]; a1[3U] = c[3U]; fsub(c, d, c); fmul_scalar(b1, c, (u64)121665U); fadd(b1, b1, d); fmul2(nq, dc1, ab1, tmp2); fmul(z3, z3, x1, tmp2); } static void point_double(u64 *nq, u64 *tmp1, u64 *tmp2) { u64 *x2 = nq; u64 *z2 = nq + (u32)4U; u64 *a = tmp1; u64 *b = tmp1 + (u32)4U; u64 *d = tmp1 + (u32)8U; u64 *c = tmp1 + (u32)12U; u64 *ab = tmp1; u64 *dc = tmp1 + (u32)8U; fadd(a, x2, z2); fsub(b, x2, z2); fsqr2(dc, ab, tmp2); a[0U] = c[0U]; a[1U] = c[1U]; a[2U] = c[2U]; a[3U] = c[3U]; fsub(c, d, c); fmul_scalar(b, c, (u64)121665U); fadd(b, b, d); fmul2(nq, dc, ab, tmp2); } static void montgomery_ladder(u64 *out, const u8 *key, u64 *init1) { u64 tmp2[16U] = { 0U }; u64 p01_tmp1_swap[33U] = { 0U }; u64 *p0 = p01_tmp1_swap; u64 *p01 = p01_tmp1_swap; u64 *p03 = p01; u64 *p11 = p01 + (u32)8U; u64 *x0; u64 *z0; u64 *p01_tmp1; u64 *p01_tmp11; u64 *nq10; u64 *nq_p11; u64 *swap1; u64 sw0; u64 *nq1; u64 *tmp1; memcpy(p11, init1, (u32)8U * sizeof(init1[0U])); x0 = p03; z0 = p03 + (u32)4U; x0[0U] = (u64)1U; x0[1U] = (u64)0U; x0[2U] = (u64)0U; x0[3U] = (u64)0U; z0[0U] = (u64)0U; z0[1U] = (u64)0U; z0[2U] = (u64)0U; z0[3U] = (u64)0U; p01_tmp1 = p01_tmp1_swap; p01_tmp11 = p01_tmp1_swap; nq10 = p01_tmp1_swap; nq_p11 = p01_tmp1_swap + (u32)8U; swap1 = p01_tmp1_swap + (u32)32U; cswap2((u64)1U, nq10, nq_p11); point_add_and_double(init1, p01_tmp11, tmp2); swap1[0U] = (u64)1U; { u32 i; for (i = (u32)0U; i < (u32)251U; i = i + (u32)1U) { u64 *p01_tmp12 = p01_tmp1_swap; u64 *swap2 = p01_tmp1_swap + (u32)32U; u64 *nq2 = p01_tmp12; u64 *nq_p12 = p01_tmp12 + (u32)8U; u64 bit = (u64)(key[((u32)253U - i) / (u32)8U] >> ((u32)253U - i) % (u32)8U & (u8)1U); u64 sw = swap2[0U] ^ bit; cswap2(sw, nq2, nq_p12); point_add_and_double(init1, p01_tmp12, tmp2); swap2[0U] = bit; } } sw0 = swap1[0U]; cswap2(sw0, nq10, nq_p11); nq1 = p01_tmp1; tmp1 = p01_tmp1 + (u32)16U; point_double(nq1, tmp1, tmp2); point_double(nq1, tmp1, tmp2); point_double(nq1, tmp1, tmp2); memcpy(out, p0, (u32)8U * sizeof(p0[0U])); memzero_explicit(tmp2, sizeof(tmp2)); memzero_explicit(p01_tmp1_swap, sizeof(p01_tmp1_swap)); } static void fsquare_times(u64 *o, const u64 *inp, u64 *tmp, u32 n1) { u32 i; fsqr(o, inp, tmp); for (i = (u32)0U; i < n1 - (u32)1U; i = i + (u32)1U) fsqr(o, o, tmp); } static void finv(u64 *o, const u64 *i, u64 *tmp) { u64 t1[16U] = { 0U }; u64 *a0 = t1; u64 *b = t1 + (u32)4U; u64 *c = t1 + (u32)8U; u64 *t00 = t1 + (u32)12U; u64 *tmp1 = tmp; u64 *a; u64 *t0; fsquare_times(a0, i, tmp1, (u32)1U); fsquare_times(t00, a0, tmp1, (u32)2U); fmul(b, t00, i, tmp); fmul(a0, b, a0, tmp); fsquare_times(t00, a0, tmp1, (u32)1U); fmul(b, t00, b, tmp); fsquare_times(t00, b, tmp1, (u32)5U); fmul(b, t00, b, tmp); fsquare_times(t00, b, tmp1, (u32)10U); fmul(c, t00, b, tmp); fsquare_times(t00, c, tmp1, (u32)20U); fmul(t00, t00, c, tmp); fsquare_times(t00, t00, tmp1, (u32)10U); fmul(b, t00, b, tmp); fsquare_times(t00, b, tmp1, (u32)50U); fmul(c, t00, b, tmp); fsquare_times(t00, c, tmp1, (u32)100U); fmul(t00, t00, c, tmp); fsquare_times(t00, t00, tmp1, (u32)50U); fmul(t00, t00, b, tmp); fsquare_times(t00, t00, tmp1, (u32)5U); a = t1; t0 = t1 + (u32)12U; fmul(o, t0, a, tmp); } static void store_felem(u64 *b, u64 *f) { u64 f30 = f[3U]; u64 top_bit0 = f30 >> (u32)63U; u64 f31; u64 top_bit; u64 f0; u64 f1; u64 f2; u64 f3; u64 m0; u64 m1; u64 m2; u64 m3; u64 mask; u64 f0_; u64 f1_; u64 f2_; u64 f3_; u64 o0; u64 o1; u64 o2; u64 o3; f[3U] = f30 & (u64)0x7fffffffffffffffU; add_scalar(f, f, (u64)19U * top_bit0); f31 = f[3U]; top_bit = f31 >> (u32)63U; f[3U] = f31 & (u64)0x7fffffffffffffffU; add_scalar(f, f, (u64)19U * top_bit); f0 = f[0U]; f1 = f[1U]; f2 = f[2U]; f3 = f[3U]; m0 = gte_mask(f0, (u64)0xffffffffffffffedU); m1 = eq_mask(f1, (u64)0xffffffffffffffffU); m2 = eq_mask(f2, (u64)0xffffffffffffffffU); m3 = eq_mask(f3, (u64)0x7fffffffffffffffU); mask = ((m0 & m1) & m2) & m3; f0_ = f0 - (mask & (u64)0xffffffffffffffedU); f1_ = f1 - (mask & (u64)0xffffffffffffffffU); f2_ = f2 - (mask & (u64)0xffffffffffffffffU); f3_ = f3 - (mask & (u64)0x7fffffffffffffffU); o0 = f0_; o1 = f1_; o2 = f2_; o3 = f3_; b[0U] = o0; b[1U] = o1; b[2U] = o2; b[3U] = o3; } static void encode_point(u8 *o, const u64 *i) { const u64 *x = i; const u64 *z = i + (u32)4U; u64 tmp[4U] = { 0U }; u64 tmp_w[16U] = { 0U }; finv(tmp, z, tmp_w); fmul(tmp, tmp, x, tmp_w); store_felem((u64 *)o, tmp); } static void curve25519_ever64(u8 *out, const u8 *priv, const u8 *pub) { u64 init1[8U] = { 0U }; u64 tmp[4U] = { 0U }; u64 tmp3; u64 *x; u64 *z; { u32 i; for (i = (u32)0U; i < (u32)4U; i = i + (u32)1U) { u64 *os = tmp; const u8 *bj = pub + i * (u32)8U; u64 u = *(u64 *)bj; u64 r = u; u64 x0 = r; os[i] = x0; } } tmp3 = tmp[3U]; tmp[3U] = tmp3 & (u64)0x7fffffffffffffffU; x = init1; z = init1 + (u32)4U; z[0U] = (u64)1U; z[1U] = (u64)0U; z[2U] = (u64)0U; z[3U] = (u64)0U; x[0U] = tmp[0U]; x[1U] = tmp[1U]; x[2U] = tmp[2U]; x[3U] = tmp[3U]; montgomery_ladder(init1, priv, init1); encode_point(out, init1); } /* The below constants were generated using this sage script: * * #!/usr/bin/env sage * import sys * from sage.all import * * def limbs(n): * n = int(n) * l = ((n >> 0) % 2^64, (n >> 64) % 2^64, (n >> 128) % 2^64, (n >> 192) % 2^64) * return "0x%016xULL, 0x%016xULL, 0x%016xULL, 0x%016xULL" % l * ec = EllipticCurve(GF(2^255 - 19), [0, 486662, 0, 1, 0]) * p_minus_s = (ec.lift_x(9) - ec.lift_x(1))[0] * print("static const u64 p_minus_s[] = { %s };\n" % limbs(p_minus_s)) * print("static const u64 table_ladder[] = {") * p = ec.lift_x(9) * for i in range(252): * l = (p[0] + p[2]) / (p[0] - p[2]) * print(("\t%s" + ("," if i != 251 else "")) % limbs(l)) * p = p * 2 * print("};") * */ static const u64 p_minus_s[] = { 0x816b1e0137d48290ULL, 0x440f6a51eb4d1207ULL, 0x52385f46dca2b71dULL, 0x215132111d8354cbULL }; static const u64 table_ladder[] = { 0xfffffffffffffff3ULL, 0xffffffffffffffffULL, 0xffffffffffffffffULL, 0x5fffffffffffffffULL, 0x6b8220f416aafe96ULL, 0x82ebeb2b4f566a34ULL, 0xd5a9a5b075a5950fULL, 0x5142b2cf4b2488f4ULL, 0x6aaebc750069680cULL, 0x89cf7820a0f99c41ULL, 0x2a58d9183b56d0f4ULL, 0x4b5aca80e36011a4ULL, 0x329132348c29745dULL, 0xf4a2e616e1642fd7ULL, 0x1e45bb03ff67bc34ULL, 0x306912d0f42a9b4aULL, 0xff886507e6af7154ULL, 0x04f50e13dfeec82fULL, 0xaa512fe82abab5ceULL, 0x174e251a68d5f222ULL, 0xcf96700d82028898ULL, 0x1743e3370a2c02c5ULL, 0x379eec98b4e86eaaULL, 0x0c59888a51e0482eULL, 0xfbcbf1d699b5d189ULL, 0xacaef0d58e9fdc84ULL, 0xc1c20d06231f7614ULL, 0x2938218da274f972ULL, 0xf6af49beff1d7f18ULL, 0xcc541c22387ac9c2ULL, 0x96fcc9ef4015c56bULL, 0x69c1627c690913a9ULL, 0x7a86fd2f4733db0eULL, 0xfdb8c4f29e087de9ULL, 0x095e4b1a8ea2a229ULL, 0x1ad7a7c829b37a79ULL, 0x342d89cad17ea0c0ULL, 0x67bedda6cced2051ULL, 0x19ca31bf2bb42f74ULL, 0x3df7b4c84980acbbULL, 0xa8c6444dc80ad883ULL, 0xb91e440366e3ab85ULL, 0xc215cda00164f6d8ULL, 0x3d867c6ef247e668ULL, 0xc7dd582bcc3e658cULL, 0xfd2c4748ee0e5528ULL, 0xa0fd9b95cc9f4f71ULL, 0x7529d871b0675ddfULL, 0xb8f568b42d3cbd78ULL, 0x1233011b91f3da82ULL, 0x2dce6ccd4a7c3b62ULL, 0x75e7fc8e9e498603ULL, 0x2f4f13f1fcd0b6ecULL, 0xf1a8ca1f29ff7a45ULL, 0xc249c1a72981e29bULL, 0x6ebe0dbb8c83b56aULL, 0x7114fa8d170bb222ULL, 0x65a2dcd5bf93935fULL, 0xbdc41f68b59c979aULL, 0x2f0eef79a2ce9289ULL, 0x42ecbf0c083c37ceULL, 0x2930bc09ec496322ULL, 0xf294b0c19cfeac0dULL, 0x3780aa4bedfabb80ULL, 0x56c17d3e7cead929ULL, 0xe7cb4beb2e5722c5ULL, 0x0ce931732dbfe15aULL, 0x41b883c7621052f8ULL, 0xdbf75ca0c3d25350ULL, 0x2936be086eb1e351ULL, 0xc936e03cb4a9b212ULL, 0x1d45bf82322225aaULL, 0xe81ab1036a024cc5ULL, 0xe212201c304c9a72ULL, 0xc5d73fba6832b1fcULL, 0x20ffdb5a4d839581ULL, 0xa283d367be5d0fadULL, 0x6c2b25ca8b164475ULL, 0x9d4935467caaf22eULL, 0x5166408eee85ff49ULL, 0x3c67baa2fab4e361ULL, 0xb3e433c67ef35cefULL, 0x5259729241159b1cULL, 0x6a621892d5b0ab33ULL, 0x20b74a387555cdcbULL, 0x532aa10e1208923fULL, 0xeaa17b7762281dd1ULL, 0x61ab3443f05c44bfULL, 0x257a6c422324def8ULL, 0x131c6c1017e3cf7fULL, 0x23758739f630a257ULL, 0x295a407a01a78580ULL, 0xf8c443246d5da8d9ULL, 0x19d775450c52fa5dULL, 0x2afcfc92731bf83dULL, 0x7d10c8e81b2b4700ULL, 0xc8e0271f70baa20bULL, 0x993748867ca63957ULL, 0x5412efb3cb7ed4bbULL, 0x3196d36173e62975ULL, 0xde5bcad141c7dffcULL, 0x47cc8cd2b395c848ULL, 0xa34cd942e11af3cbULL, 0x0256dbf2d04ecec2ULL, 0x875ab7e94b0e667fULL, 0xcad4dd83c0850d10ULL, 0x47f12e8f4e72c79fULL, 0x5f1a87bb8c85b19bULL, 0x7ae9d0b6437f51b8ULL, 0x12c7ce5518879065ULL, 0x2ade09fe5cf77aeeULL, 0x23a05a2f7d2c5627ULL, 0x5908e128f17c169aULL, 0xf77498dd8ad0852dULL, 0x74b4c4ceab102f64ULL, 0x183abadd10139845ULL, 0xb165ba8daa92aaacULL, 0xd5c5ef9599386705ULL, 0xbe2f8f0cf8fc40d1ULL, 0x2701e635ee204514ULL, 0x629fa80020156514ULL, 0xf223868764a8c1ceULL, 0x5b894fff0b3f060eULL, 0x60d9944cf708a3faULL, 0xaeea001a1c7a201fULL, 0xebf16a633ee2ce63ULL, 0x6f7709594c7a07e1ULL, 0x79b958150d0208cbULL, 0x24b55e5301d410e7ULL, 0xe3a34edff3fdc84dULL, 0xd88768e4904032d8ULL, 0x131384427b3aaeecULL, 0x8405e51286234f14ULL, 0x14dc4739adb4c529ULL, 0xb8a2b5b250634ffdULL, 0x2fe2a94ad8a7ff93ULL, 0xec5c57efe843faddULL, 0x2843ce40f0bb9918ULL, 0xa4b561d6cf3d6305ULL, 0x743629bde8fb777eULL, 0x343edd46bbaf738fULL, 0xed981828b101a651ULL, 0xa401760b882c797aULL, 0x1fc223e28dc88730ULL, 0x48604e91fc0fba0eULL, 0xb637f78f052c6fa4ULL, 0x91ccac3d09e9239cULL, 0x23f7eed4437a687cULL, 0x5173b1118d9bd800ULL, 0x29d641b63189d4a7ULL, 0xfdbf177988bbc586ULL, 0x2959894fcad81df5ULL, 0xaebc8ef3b4bbc899ULL, 0x4148995ab26992b9ULL, 0x24e20b0134f92cfbULL, 0x40d158894a05dee8ULL, 0x46b00b1185af76f6ULL, 0x26bac77873187a79ULL, 0x3dc0bf95ab8fff5fULL, 0x2a608bd8945524d7ULL, 0x26449588bd446302ULL, 0x7c4bc21c0388439cULL, 0x8e98a4f383bd11b2ULL, 0x26218d7bc9d876b9ULL, 0xe3081542997c178aULL, 0x3c2d29a86fb6606fULL, 0x5c217736fa279374ULL, 0x7dde05734afeb1faULL, 0x3bf10e3906d42babULL, 0xe4f7803e1980649cULL, 0xe6053bf89595bf7aULL, 0x394faf38da245530ULL, 0x7a8efb58896928f4ULL, 0xfbc778e9cc6a113cULL, 0x72670ce330af596fULL, 0x48f222a81d3d6cf7ULL, 0xf01fce410d72caa7ULL, 0x5a20ecc7213b5595ULL, 0x7bc21165c1fa1483ULL, 0x07f89ae31da8a741ULL, 0x05d2c2b4c6830ff9ULL, 0xd43e330fc6316293ULL, 0xa5a5590a96d3a904ULL, 0x705edb91a65333b6ULL, 0x048ee15e0bb9a5f7ULL, 0x3240cfca9e0aaf5dULL, 0x8f4b71ceedc4a40bULL, 0x621c0da3de544a6dULL, 0x92872836a08c4091ULL, 0xce8375b010c91445ULL, 0x8a72eb524f276394ULL, 0x2667fcfa7ec83635ULL, 0x7f4c173345e8752aULL, 0x061b47feee7079a5ULL, 0x25dd9afa9f86ff34ULL, 0x3780cef5425dc89cULL, 0x1a46035a513bb4e9ULL, 0x3e1ef379ac575adaULL, 0xc78c5f1c5fa24b50ULL, 0x321a967634fd9f22ULL, 0x946707b8826e27faULL, 0x3dca84d64c506fd0ULL, 0xc189218075e91436ULL, 0x6d9284169b3b8484ULL, 0x3a67e840383f2ddfULL, 0x33eec9a30c4f9b75ULL, 0x3ec7c86fa783ef47ULL, 0x26ec449fbac9fbc4ULL, 0x5c0f38cba09b9e7dULL, 0x81168cc762a3478cULL, 0x3e23b0d306fc121cULL, 0x5a238aa0a5efdcddULL, 0x1ba26121c4ea43ffULL, 0x36f8c77f7c8832b5ULL, 0x88fbea0b0adcf99aULL, 0x5ca9938ec25bebf9ULL, 0xd5436a5e51fccda0ULL, 0x1dbc4797c2cd893bULL, 0x19346a65d3224a08ULL, 0x0f5034e49b9af466ULL, 0xf23c3967a1e0b96eULL, 0xe58b08fa867a4d88ULL, 0xfb2fabc6a7341679ULL, 0x2a75381eb6026946ULL, 0xc80a3be4c19420acULL, 0x66b1f6c681f2b6dcULL, 0x7cf7036761e93388ULL, 0x25abbbd8a660a4c4ULL, 0x91ea12ba14fd5198ULL, 0x684950fc4a3cffa9ULL, 0xf826842130f5ad28ULL, 0x3ea988f75301a441ULL, 0xc978109a695f8c6fULL, 0x1746eb4a0530c3f3ULL, 0x444d6d77b4459995ULL, 0x75952b8c054e5cc7ULL, 0xa3703f7915f4d6aaULL, 0x66c346202f2647d8ULL, 0xd01469df811d644bULL, 0x77fea47d81a5d71fULL, 0xc5e9529ef57ca381ULL, 0x6eeeb4b9ce2f881aULL, 0xb6e91a28e8009bd6ULL, 0x4b80be3e9afc3fecULL, 0x7e3773c526aed2c5ULL, 0x1b4afcb453c9a49dULL, 0xa920bdd7baffb24dULL, 0x7c54699f122d400eULL, 0xef46c8e14fa94bc8ULL, 0xe0b074ce2952ed5eULL, 0xbea450e1dbd885d5ULL, 0x61b68649320f712cULL, 0x8a485f7309ccbdd1ULL, 0xbd06320d7d4d1a2dULL, 0x25232973322dbef4ULL, 0x445dc4758c17f770ULL, 0xdb0434177cc8933cULL, 0xed6fe82175ea059fULL, 0x1efebefdc053db34ULL, 0x4adbe867c65daf99ULL, 0x3acd71a2a90609dfULL, 0xe5e991856dd04050ULL, 0x1ec69b688157c23cULL, 0x697427f6885cfe4dULL, 0xd7be7b9b65e1a851ULL, 0xa03d28d522c536ddULL, 0x28399d658fd2b645ULL, 0x49e5b7e17c2641e1ULL, 0x6f8c3a98700457a4ULL, 0x5078f0a25ebb6778ULL, 0xd13c3ccbc382960fULL, 0x2e003258a7df84b1ULL, 0x8ad1f39be6296a1cULL, 0xc1eeaa652a5fbfb2ULL, 0x33ee0673fd26f3cbULL, 0x59256173a69d2cccULL, 0x41ea07aa4e18fc41ULL, 0xd9fc19527c87a51eULL, 0xbdaacb805831ca6fULL, 0x445b652dc916694fULL, 0xce92a3a7f2172315ULL, 0x1edc282de11b9964ULL, 0xa1823aafe04c314aULL, 0x790a2d94437cf586ULL, 0x71c447fb93f6e009ULL, 0x8922a56722845276ULL, 0xbf70903b204f5169ULL, 0x2f7a89891ba319feULL, 0x02a08eb577e2140cULL, 0xed9a4ed4427bdcf4ULL, 0x5253ec44e4323cd1ULL, 0x3e88363c14e9355bULL, 0xaa66c14277110b8cULL, 0x1ae0391610a23390ULL, 0x2030bd12c93fc2a2ULL, 0x3ee141579555c7abULL, 0x9214de3a6d6e7d41ULL, 0x3ccdd88607f17efeULL, 0x674f1288f8e11217ULL, 0x5682250f329f93d0ULL, 0x6cf00b136d2e396eULL, 0x6e4cf86f1014debfULL, 0x5930b1b5bfcc4e83ULL, 0x047069b48aba16b6ULL, 0x0d4ce4ab69b20793ULL, 0xb24db91a97d0fb9eULL, 0xcdfa50f54e00d01dULL, 0x221b1085368bddb5ULL, 0xe7e59468b1e3d8d2ULL, 0x53c56563bd122f93ULL, 0xeee8a903e0663f09ULL, 0x61efa662cbbe3d42ULL, 0x2cf8ddddde6eab2aULL, 0x9bf80ad51435f231ULL, 0x5deadacec9f04973ULL, 0x29275b5d41d29b27ULL, 0xcfde0f0895ebf14fULL, 0xb9aab96b054905a7ULL, 0xcae80dd9a1c420fdULL, 0x0a63bf2f1673bbc7ULL, 0x092f6e11958fbc8cULL, 0x672a81e804822fadULL, 0xcac8351560d52517ULL, 0x6f3f7722c8f192f8ULL, 0xf8ba90ccc2e894b7ULL, 0x2c7557a438ff9f0dULL, 0x894d1d855ae52359ULL, 0x68e122157b743d69ULL, 0xd87e5570cfb919f3ULL, 0x3f2cdecd95798db9ULL, 0x2121154710c0a2ceULL, 0x3c66a115246dc5b2ULL, 0xcbedc562294ecb72ULL, 0xba7143c36a280b16ULL, 0x9610c2efd4078b67ULL, 0x6144735d946a4b1eULL, 0x536f111ed75b3350ULL, 0x0211db8c2041d81bULL, 0xf93cb1000e10413cULL, 0x149dfd3c039e8876ULL, 0xd479dde46b63155bULL, 0xb66e15e93c837976ULL, 0xdafde43b1f13e038ULL, 0x5fafda1a2e4b0b35ULL, 0x3600bbdf17197581ULL, 0x3972050bbe3cd2c2ULL, 0x5938906dbdd5be86ULL, 0x34fce5e43f9b860fULL, 0x75a8a4cd42d14d02ULL, 0x828dabc53441df65ULL, 0x33dcabedd2e131d3ULL, 0x3ebad76fb814d25fULL, 0xd4906f566f70e10fULL, 0x5d12f7aa51690f5aULL, 0x45adb16e76cefcf2ULL, 0x01f768aead232999ULL, 0x2b6cc77b6248febdULL, 0x3cd30628ec3aaffdULL, 0xce1c0b80d4ef486aULL, 0x4c3bff2ea6f66c23ULL, 0x3f2ec4094aeaeb5fULL, 0x61b19b286e372ca7ULL, 0x5eefa966de2a701dULL, 0x23b20565de55e3efULL, 0xe301ca5279d58557ULL, 0x07b2d4ce27c2874fULL, 0xa532cd8a9dcf1d67ULL, 0x2a52fee23f2bff56ULL, 0x8624efb37cd8663dULL, 0xbbc7ac20ffbd7594ULL, 0x57b85e9c82d37445ULL, 0x7b3052cb86a6ec66ULL, 0x3482f0ad2525e91eULL, 0x2cb68043d28edca0ULL, 0xaf4f6d052e1b003aULL, 0x185f8c2529781b0aULL, 0xaa41de5bd80ce0d6ULL, 0x9407b2416853e9d6ULL, 0x563ec36e357f4c3aULL, 0x4cc4b8dd0e297bceULL, 0xa2fc1a52ffb8730eULL, 0x1811f16e67058e37ULL, 0x10f9a366cddf4ee1ULL, 0x72f4a0c4a0b9f099ULL, 0x8c16c06f663f4ea7ULL, 0x693b3af74e970fbaULL, 0x2102e7f1d69ec345ULL, 0x0ba53cbc968a8089ULL, 0xca3d9dc7fea15537ULL, 0x4c6824bb51536493ULL, 0xb9886314844006b1ULL, 0x40d2a72ab454cc60ULL, 0x5936a1b712570975ULL, 0x91b9d648debda657ULL, 0x3344094bb64330eaULL, 0x006ba10d12ee51d0ULL, 0x19228468f5de5d58ULL, 0x0eb12f4c38cc05b0ULL, 0xa1039f9dd5601990ULL, 0x4502d4ce4fff0e0bULL, 0xeb2054106837c189ULL, 0xd0f6544c6dd3b93cULL, 0x40727064c416d74fULL, 0x6e15c6114b502ef0ULL, 0x4df2a398cfb1a76bULL, 0x11256c7419f2f6b1ULL, 0x4a497962066e6043ULL, 0x705b3aab41355b44ULL, 0x365ef536d797b1d8ULL, 0x00076bd622ddf0dbULL, 0x3bbf33b0e0575a88ULL, 0x3777aa05c8e4ca4dULL, 0x392745c85578db5fULL, 0x6fda4149dbae5ae2ULL, 0xb1f0b00b8adc9867ULL, 0x09963437d36f1da3ULL, 0x7e824e90a5dc3853ULL, 0xccb5f6641f135cbdULL, 0x6736d86c87ce8fccULL, 0x625f3ce26604249fULL, 0xaf8ac8059502f63fULL, 0x0c05e70a2e351469ULL, 0x35292e9c764b6305ULL, 0x1a394360c7e23ac3ULL, 0xd5c6d53251183264ULL, 0x62065abd43c2b74fULL, 0xb5fbf5d03b973f9bULL, 0x13a3da3661206e5eULL, 0xc6bd5837725d94e5ULL, 0x18e30912205016c5ULL, 0x2088ce1570033c68ULL, 0x7fba1f495c837987ULL, 0x5a8c7423f2f9079dULL, 0x1735157b34023fc5ULL, 0xe4f9b49ad2fab351ULL, 0x6691ff72c878e33cULL, 0x122c2adedc5eff3eULL, 0xf8dd4bf1d8956cf4ULL, 0xeb86205d9e9e5bdaULL, 0x049b92b9d975c743ULL, 0xa5379730b0f6c05aULL, 0x72a0ffacc6f3a553ULL, 0xb0032c34b20dcd6dULL, 0x470e9dbc88d5164aULL, 0xb19cf10ca237c047ULL, 0xb65466711f6c81a2ULL, 0xb3321bd16dd80b43ULL, 0x48c14f600c5fbe8eULL, 0x66451c264aa6c803ULL, 0xb66e3904a4fa7da6ULL, 0xd45f19b0b3128395ULL, 0x31602627c3c9bc10ULL, 0x3120dc4832e4e10dULL, 0xeb20c46756c717f7ULL, 0x00f52e3f67280294ULL, 0x566d4fc14730c509ULL, 0x7e3a5d40fd837206ULL, 0xc1e926dc7159547aULL, 0x216730fba68d6095ULL, 0x22e8c3843f69cea7ULL, 0x33d074e8930e4b2bULL, 0xb6e4350e84d15816ULL, 0x5534c26ad6ba2365ULL, 0x7773c12f89f1f3f3ULL, 0x8cba404da57962aaULL, 0x5b9897a81999ce56ULL, 0x508e862f121692fcULL, 0x3a81907fa093c291ULL, 0x0dded0ff4725a510ULL, 0x10d8cc10673fc503ULL, 0x5b9d151c9f1f4e89ULL, 0x32a5c1d5cb09a44cULL, 0x1e0aa442b90541fbULL, 0x5f85eb7cc1b485dbULL, 0xbee595ce8a9df2e5ULL, 0x25e496c722422236ULL, 0x5edf3c46cd0fe5b9ULL, 0x34e75a7ed2a43388ULL, 0xe488de11d761e352ULL, 0x0e878a01a085545cULL, 0xba493c77e021bb04ULL, 0x2b4d1843c7df899aULL, 0x9ea37a487ae80d67ULL, 0x67a9958011e41794ULL, 0x4b58051a6697b065ULL, 0x47e33f7d8d6ba6d4ULL, 0xbb4da8d483ca46c1ULL, 0x68becaa181c2db0dULL, 0x8d8980e90b989aa5ULL, 0xf95eb14a2c93c99bULL, 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0x980697f95e2937e3ULL, 0x02fbba1cd0126e8cULL }; static void curve25519_ever64_base(u8 *out, const u8 *priv) { u64 swap = 1; int i, j, k; u64 tmp[16 + 32 + 4]; u64 *x1 = &tmp[0]; u64 *z1 = &tmp[4]; u64 *x2 = &tmp[8]; u64 *z2 = &tmp[12]; u64 *xz1 = &tmp[0]; u64 *xz2 = &tmp[8]; u64 *a = &tmp[0 + 16]; u64 *b = &tmp[4 + 16]; u64 *c = &tmp[8 + 16]; u64 *ab = &tmp[0 + 16]; u64 *abcd = &tmp[0 + 16]; u64 *ef = &tmp[16 + 16]; u64 *efgh = &tmp[16 + 16]; u64 *key = &tmp[0 + 16 + 32]; memcpy(key, priv, 32); ((u8 *)key)[0] &= 248; ((u8 *)key)[31] = (((u8 *)key)[31] & 127) | 64; x1[0] = 1, x1[1] = x1[2] = x1[3] = 0; z1[0] = 1, z1[1] = z1[2] = z1[3] = 0; z2[0] = 1, z2[1] = z2[2] = z2[3] = 0; memcpy(x2, p_minus_s, sizeof(p_minus_s)); j = 3; for (i = 0; i < 4; ++i) { while (j < (const int[]){ 64, 64, 64, 63 }[i]) { u64 bit = (key[i] >> j) & 1; k = (64 * i + j - 3); swap = swap ^ bit; cswap2(swap, xz1, xz2); swap = bit; fsub(b, x1, z1); fadd(a, x1, z1); fmul(c, &table_ladder[4 * k], b, ef); fsub(b, a, c); fadd(a, a, c); fsqr2(ab, ab, efgh); fmul2(xz1, xz2, ab, efgh); ++j; } j = 0; } point_double(xz1, abcd, efgh); point_double(xz1, abcd, efgh); point_double(xz1, abcd, efgh); encode_point(out, xz1); memzero_explicit(tmp, sizeof(tmp)); } static __ro_after_init DEFINE_STATIC_KEY_FALSE(curve25519_use_bmi2_adx); void curve25519_arch(u8 mypublic[CURVE25519_KEY_SIZE], const u8 secret[CURVE25519_KEY_SIZE], const u8 basepoint[CURVE25519_KEY_SIZE]) { if (static_branch_likely(&curve25519_use_bmi2_adx)) curve25519_ever64(mypublic, secret, basepoint); else curve25519_generic(mypublic, secret, basepoint); } EXPORT_SYMBOL(curve25519_arch); void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE], const u8 secret[CURVE25519_KEY_SIZE]) { if (static_branch_likely(&curve25519_use_bmi2_adx)) curve25519_ever64_base(pub, secret); else curve25519_generic(pub, secret, curve25519_base_point); } EXPORT_SYMBOL(curve25519_base_arch); static int curve25519_set_secret(struct crypto_kpp *tfm, const void *buf, unsigned int len) { u8 *secret = kpp_tfm_ctx(tfm); if (!len) curve25519_generate_secret(secret); else if (len == CURVE25519_KEY_SIZE && crypto_memneq(buf, curve25519_null_point, CURVE25519_KEY_SIZE)) memcpy(secret, buf, CURVE25519_KEY_SIZE); else return -EINVAL; return 0; } static int curve25519_generate_public_key(struct kpp_request *req) { struct crypto_kpp *tfm = crypto_kpp_reqtfm(req); const u8 *secret = kpp_tfm_ctx(tfm); u8 buf[CURVE25519_KEY_SIZE]; int copied, nbytes; if (req->src) return -EINVAL; curve25519_base_arch(buf, secret); /* might want less than we've got */ nbytes = min_t(size_t, CURVE25519_KEY_SIZE, req->dst_len); copied = sg_copy_from_buffer(req->dst, sg_nents_for_len(req->dst, nbytes), buf, nbytes); if (copied != nbytes) return -EINVAL; return 0; } static int curve25519_compute_shared_secret(struct kpp_request *req) { struct crypto_kpp *tfm = crypto_kpp_reqtfm(req); const u8 *secret = kpp_tfm_ctx(tfm); u8 public_key[CURVE25519_KEY_SIZE]; u8 buf[CURVE25519_KEY_SIZE]; int copied, nbytes; if (!req->src) return -EINVAL; copied = sg_copy_to_buffer(req->src, sg_nents_for_len(req->src, CURVE25519_KEY_SIZE), public_key, CURVE25519_KEY_SIZE); if (copied != CURVE25519_KEY_SIZE) return -EINVAL; curve25519_arch(buf, secret, public_key); /* might want less than we've got */ nbytes = min_t(size_t, CURVE25519_KEY_SIZE, req->dst_len); copied = sg_copy_from_buffer(req->dst, sg_nents_for_len(req->dst, nbytes), buf, nbytes); if (copied != nbytes) return -EINVAL; return 0; } static unsigned int curve25519_max_size(struct crypto_kpp *tfm) { return CURVE25519_KEY_SIZE; } static struct kpp_alg curve25519_alg = { .base.cra_name = "curve25519", .base.cra_driver_name = "curve25519-x86", .base.cra_priority = 200, .base.cra_module = THIS_MODULE, .base.cra_ctxsize = CURVE25519_KEY_SIZE, .set_secret = curve25519_set_secret, .generate_public_key = curve25519_generate_public_key, .compute_shared_secret = curve25519_compute_shared_secret, .max_size = curve25519_max_size, }; static int __init curve25519_mod_init(void) { if (boot_cpu_has(X86_FEATURE_BMI2) && boot_cpu_has(X86_FEATURE_ADX)) static_branch_enable(&curve25519_use_bmi2_adx); else return 0; return IS_REACHABLE(CONFIG_CRYPTO_KPP) ? crypto_register_kpp(&curve25519_alg) : 0; } static void __exit curve25519_mod_exit(void) { if (IS_REACHABLE(CONFIG_CRYPTO_KPP) && static_branch_likely(&curve25519_use_bmi2_adx)) crypto_unregister_kpp(&curve25519_alg); } module_init(curve25519_mod_init); module_exit(curve25519_mod_exit); MODULE_ALIAS_CRYPTO("curve25519"); MODULE_ALIAS_CRYPTO("curve25519-x86"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Jason A. Donenfeld ");