+/* ====================================================================
+ * Copyright (c) 2015 The OpenSSL Project. All rights reserved.
+ *
+ * Rights for redistribution and usage in source and binary
+ * forms are granted according to the OpenSSL license.
+ */
+
+/*
+ * This module is meant to be used as template for non-x87 floating-
+ * point assembly modules. The template itself is x86_64-specific
+ * though, as it was debugged on x86_64. So that implementor would
+ * have to recognize platform-specific parts, UxTOy and inline asm,
+ * and act accordingly.
+ *
+ * Huh? x86_64-specific code as template for non-x87? Note seven, which
+ * is not a typo, but reference to 80-bit precision. This module on the
+ * other hand relies on 64-bit precision operations, which are default
+ * for x86_64 code. And since we are at it, just for sense of it,
+ * large-block performance in cycles per processed byte for *this* code
+ * is:
+ * gcc-4.8 icc-15.0 clang-3.4(*)
+ *
+ * Westmere 4.96 5.09 4.37
+ * Sandy Bridge 4.95 4.90 4.17
+ * Haswell 4.92 4.87 3.78
+ * Bulldozer 4.67 4.49 4.68
+ * VIA Nano 7.07 7.05 5.98
+ * Silvermont 10.6 9.61 12.6
+ *
+ * (*) clang managed to discover parallelism and deployed SIMD;
+ *
+ * And for range of other platforms with unspecified gcc versions:
+ *
+ * Freescale e300 12.5
+ * PPC74x0 10.8
+ * POWER6 4.92
+ * POWER7 4.50
+ * POWER8 4.10
+ *
+ * z10 11.2
+ * z196+ 7.30
+ *
+ * UltraSPARC III 16.0
+ * SPARC T4 16.1
+ */
+
+#if !(defined(__GNUC__) && __GNUC__>=2)
+# error "this is gcc-specific template"
+#endif
+
+#include <stdlib.h>
+
+typedef unsigned char u8;
+typedef unsigned int u32;
+typedef unsigned long long u64;
+typedef union { double d; u64 u; } elem64;
+
+#define TWO(p) ((double)(1ULL<<(p)))
+#define TWO0 TWO(0)
+#define TWO32 TWO(32)
+#define TWO64 (TWO32*TWO(32))
+#define TWO96 (TWO64*TWO(32))
+#define TWO130 (TWO96*TWO(34))
+
+#define EXP(p) ((1023ULL+(p))<<52)
+
+#if defined(__x86_64__) || (defined(__PPC__) && defined(__LITTLE_ENDIAN__))
+# define U8TOU32(p) (*(const u32 *)(p))
+# define U32TO8(p,v) (*(u32 *)(p) = (v))
+#elif defined(__PPC__)
+# define U8TOU32(p) ({u32 ret; asm ("lwbrx %0,0,%1":"=r"(ret):"b"(p)); ret; })
+# define U32TO8(p,v) asm ("stwbrx %0,0,%1"::"r"(v),"b"(p):"memory")
+#elif defined(__s390x__)
+# define U8TOU32(p) ({u32 ret; asm ("lrv %0,%1":"=d"(ret):"m"(*(u32 *)(p))); ret; })
+# define U32TO8(p,v) asm ("strv %1,%0":"=m"(*(u32 *)(p)):"d"(v))
+#endif
+
+#ifndef U8TOU32
+# define U8TOU32(p) ((u32)(p)[0] | (u32)(p)[1]<<8 | \
+ (u32)(p)[2]<<16 | (u32)(p)[3]<<24 )
+#endif
+#ifndef U32TO8
+# define U32TO8(p,v) ((p)[0] = (u8)(v), (p)[1] = (u8)((v)>>8), \
+ (p)[2] = (u8)((v)>>16), (p)[3] = (u8)((v)>>24) )
+#endif
+
+typedef struct {
+ elem64 h[4];
+ double r[8];
+ double s[6];
+} poly1305_internal;
+
+/* "round toward zero (truncate), mask all exceptions" */
+#if defined(__x86_64__)
+static const u32 mxcsr = 0x7f80;
+#elif defined(__PPC__)
+static const u64 one = 1;
+#elif defined(__s390x__)
+static const u32 fpc = 1;
+#elif defined(__sparc__)
+static const u64 fsr = 1ULL<<30;
+#else
+#error "unrecognized platform"
+#endif
+
+int poly1305_init(void *ctx, const unsigned char key[16])
+{
+ poly1305_internal *st = (poly1305_internal *) ctx;
+ elem64 r0, r1, r2, r3;
+
+ /* h = 0, biased */
+#if 0
+ st->h[0].d = TWO(52)*TWO0;
+ st->h[1].d = TWO(52)*TWO32;
+ st->h[2].d = TWO(52)*TWO64;
+ st->h[3].d = TWO(52)*TWO96;
+#else
+ st->h[0].u = EXP(52+0);
+ st->h[1].u = EXP(52+32);
+ st->h[2].u = EXP(52+64);
+ st->h[3].u = EXP(52+96);
+#endif
+
+ if (key) {
+ /*
+ * set "truncate" rounding mode
+ */
+#if defined(__x86_64__)
+ u32 mxcsr_orig;
+
+ asm volatile ("stmxcsr %0":"=m"(mxcsr_orig));
+ asm volatile ("ldmxcsr %0"::"m"(mxcsr));
+#elif defined(__PPC__)
+ double fpscr_orig, fpscr = *(double *)&one;
+
+ asm volatile ("mffs %0":"=f"(fpscr_orig));
+ asm volatile ("mtfsf 255,%0"::"f"(fpscr));
+#elif defined(__s390x__)
+ u32 fpc_orig;
+
+ asm volatile ("stfpc %0":"=m"(fpc_orig));
+ asm volatile ("lfpc %0"::"m"(fpc));
+#elif defined(__sparc__)
+ u64 fsr_orig;
+
+ asm volatile ("stx %%fsr,%0":"=m"(fsr_orig));
+ asm volatile ("ldx %0,%%fsr"::"m"(fsr));
+#endif
+
+ /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
+ r0.u = EXP(52+0) | (U8TOU32(&key[0]) & 0x0fffffff);
+ r1.u = EXP(52+32) | (U8TOU32(&key[4]) & 0x0ffffffc);
+ r2.u = EXP(52+64) | (U8TOU32(&key[8]) & 0x0ffffffc);
+ r3.u = EXP(52+96) | (U8TOU32(&key[12]) & 0x0ffffffc);
+
+ st->r[0] = r0.d - TWO(52)*TWO0;
+ st->r[2] = r1.d - TWO(52)*TWO32;
+ st->r[4] = r2.d - TWO(52)*TWO64;
+ st->r[6] = r3.d - TWO(52)*TWO96;
+
+ st->s[0] = st->r[2] * (5.0/TWO130);
+ st->s[2] = st->r[4] * (5.0/TWO130);
+ st->s[4] = st->r[6] * (5.0/TWO130);
+
+ /*
+ * base 2^32 -> base 2^16
+ */
+ st->r[1] = (st->r[0] + TWO(52)*TWO(16)*TWO0) -
+ TWO(52)*TWO(16)*TWO0;
+ st->r[0] -= st->r[1];
+
+ st->r[3] = (st->r[2] + TWO(52)*TWO(16)*TWO32) -
+ TWO(52)*TWO(16)*TWO32;
+ st->r[2] -= st->r[3];
+
+ st->r[5] = (st->r[4] + TWO(52)*TWO(16)*TWO64) -
+ TWO(52)*TWO(16)*TWO64;
+ st->r[4] -= st->r[5];
+
+ st->r[7] = (st->r[6] + TWO(52)*TWO(16)*TWO96) -
+ TWO(52)*TWO(16)*TWO96;
+ st->r[6] -= st->r[7];
+
+ st->s[1] = (st->s[0] + TWO(52)*TWO(16)*TWO0/TWO96) -
+ TWO(52)*TWO(16)*TWO0/TWO96;
+ st->s[0] -= st->s[1];
+
+ st->s[3] = (st->s[2] + TWO(52)*TWO(16)*TWO32/TWO96) -
+ TWO(52)*TWO(16)*TWO32/TWO96;
+ st->s[2] -= st->s[3];
+
+ st->s[5] = (st->s[4] + TWO(52)*TWO(16)*TWO64/TWO96) -
+ TWO(52)*TWO(16)*TWO64/TWO96;
+ st->s[4] -= st->s[5];
+
+ /*
+ * restore original FPU control register
+ */
+#if defined(__x86_64__)
+ asm volatile ("ldmxcsr %0"::"m"(mxcsr_orig));
+#elif defined(__PPC__)
+ asm volatile ("mtfsf 255,%0"::"f"(fpscr_orig));
+#elif defined(__s390x__)
+ asm volatile ("lfpc %0"::"m"(fpc_orig));
+#elif defined(__sparc__)
+ asm volatile ("ldx %0,%%fsr"::"m"(fsr_orig));
+#endif
+ }
+
+ return 0;
+}
+
+void poly1305_blocks(void *ctx, const unsigned char *inp, size_t len,
+ int padbit)
+{
+ poly1305_internal *st = (poly1305_internal *)ctx;
+ elem64 in0, in1, in2, in3;
+ u64 pad = (u64)padbit<<32;
+
+ double x0, x1, x2, x3;
+ double h0lo, h0hi, h1lo, h1hi, h2lo, h2hi, h3lo, h3hi;
+ double c0lo, c0hi, c1lo, c1hi, c2lo, c2hi, c3lo, c3hi;
+
+ const double r0lo = st->r[0];
+ const double r0hi = st->r[1];
+ const double r1lo = st->r[2];
+ const double r1hi = st->r[3];
+ const double r2lo = st->r[4];
+ const double r2hi = st->r[5];
+ const double r3lo = st->r[6];
+ const double r3hi = st->r[7];
+
+ const double s1lo = st->s[0];
+ const double s1hi = st->s[1];
+ const double s2lo = st->s[2];
+ const double s2hi = st->s[3];
+ const double s3lo = st->s[4];
+ const double s3hi = st->s[5];
+
+ /*
+ * set "truncate" rounding mode
+ */
+#if defined(__x86_64__)
+ u32 mxcsr_orig;
+
+ asm volatile ("stmxcsr %0":"=m"(mxcsr_orig));
+ asm volatile ("ldmxcsr %0"::"m"(mxcsr));
+#elif defined(__PPC__)
+ double fpscr_orig, fpscr = *(double *)&one;
+
+ asm volatile ("mffs %0":"=f"(fpscr_orig));
+ asm volatile ("mtfsf 255,%0"::"f"(fpscr));
+#elif defined(__s390x__)
+ u32 fpc_orig;
+
+ asm volatile ("stfpc %0":"=m"(fpc_orig));
+ asm volatile ("lfpc %0"::"m"(fpc));
+#elif defined(__sparc__)
+ u64 fsr_orig;
+
+ asm volatile ("stx %%fsr,%0":"=m"(fsr_orig));
+ asm volatile ("ldx %0,%%fsr"::"m"(fsr));
+#endif
+
+ /*
+ * load base 2^32 and de-bias
+ */
+ h0lo = st->h[0].d - TWO(52)*TWO0;
+ h1lo = st->h[1].d - TWO(52)*TWO32;
+ h2lo = st->h[2].d - TWO(52)*TWO64;
+ h3lo = st->h[3].d - TWO(52)*TWO96;
+
+#ifdef __clang__
+ h0hi = 0;
+ h1hi = 0;
+ h2hi = 0;
+ h3hi = 0;
+#else
+ in0.u = EXP(52+0) | U8TOU32(&inp[0]);
+ in1.u = EXP(52+32) | U8TOU32(&inp[4]);
+ in2.u = EXP(52+64) | U8TOU32(&inp[8]);
+ in3.u = EXP(52+96) | U8TOU32(&inp[12]) | pad;
+
+ x0 = in0.d - TWO(52)*TWO0;
+ x1 = in1.d - TWO(52)*TWO32;
+ x2 = in2.d - TWO(52)*TWO64;
+ x3 = in3.d - TWO(52)*TWO96;
+
+ x0 += h0lo;
+ x1 += h1lo;
+ x2 += h2lo;
+ x3 += h3lo;
+
+ goto fast_entry;
+#endif
+
+ do {
+ in0.u = EXP(52+0) | U8TOU32(&inp[0]);
+ in1.u = EXP(52+32) | U8TOU32(&inp[4]);
+ in2.u = EXP(52+64) | U8TOU32(&inp[8]);
+ in3.u = EXP(52+96) | U8TOU32(&inp[12]) | pad;
+
+ x0 = in0.d - TWO(52)*TWO0;
+ x1 = in1.d - TWO(52)*TWO32;
+ x2 = in2.d - TWO(52)*TWO64;
+ x3 = in3.d - TWO(52)*TWO96;
+
+ /*
+ * note that there are multiple ways to accumulate input, e.g.
+ * one can as well accumulate to h0lo-h1lo-h1hi-h2hi...
+ */
+ h0lo += x0;
+ h0hi += x1;
+ h2lo += x2;
+ h2hi += x3;
+
+ /*
+ * carries that cross 32n-bit (and 130-bit) boundaries
+ */
+ c0lo = (h0lo + TWO(52)*TWO32) - TWO(52)*TWO32;
+ c1lo = (h1lo + TWO(52)*TWO64) - TWO(52)*TWO64;
+ c2lo = (h2lo + TWO(52)*TWO96) - TWO(52)*TWO96;
+ c3lo = (h3lo + TWO(52)*TWO130) - TWO(52)*TWO130;
+
+ c0hi = (h0hi + TWO(52)*TWO32) - TWO(52)*TWO32;
+ c1hi = (h1hi + TWO(52)*TWO64) - TWO(52)*TWO64;
+ c2hi = (h2hi + TWO(52)*TWO96) - TWO(52)*TWO96;
+ c3hi = (h3hi + TWO(52)*TWO130) - TWO(52)*TWO130;
+
+ /*
+ * base 2^48 -> base 2^32 with last reduction step
+ */
+ x1 = (h1lo - c1lo) + c0lo;
+ x2 = (h2lo - c2lo) + c1lo;
+ x3 = (h3lo - c3lo) + c2lo;
+ x0 = (h0lo - c0lo) + c3lo * (5.0/TWO130);
+
+ x1 += (h1hi - c1hi) + c0hi;
+ x2 += (h2hi - c2hi) + c1hi;
+ x3 += (h3hi - c3hi) + c2hi;
+ x0 += (h0hi - c0hi) + c3hi * (5.0/TWO130);
+
+#ifndef __clang__
+ fast_entry:
+#endif
+ /*
+ * base 2^32 * base 2^16 = base 2^48
+ */
+ h0lo = s3lo * x1 + s2lo * x2 + s1lo * x3 + r0lo * x0;
+ h1lo = r0lo * x1 + s3lo * x2 + s2lo * x3 + r1lo * x0;
+ h2lo = r1lo * x1 + r0lo * x2 + s3lo * x3 + r2lo * x0;
+ h3lo = r2lo * x1 + r1lo * x2 + r0lo * x3 + r3lo * x0;
+
+ h0hi = s3hi * x1 + s2hi * x2 + s1hi * x3 + r0hi * x0;
+ h1hi = r0hi * x1 + s3hi * x2 + s2hi * x3 + r1hi * x0;
+ h2hi = r1hi * x1 + r0hi * x2 + s3hi * x3 + r2hi * x0;
+ h3hi = r2hi * x1 + r1hi * x2 + r0hi * x3 + r3hi * x0;
+
+ inp += 16;
+ len -= 16;
+
+ } while (len >= 16);
+
+ /*
+ * carries that cross 32n-bit (and 130-bit) boundaries
+ */
+ c0lo = (h0lo + TWO(52)*TWO32) - TWO(52)*TWO32;
+ c1lo = (h1lo + TWO(52)*TWO64) - TWO(52)*TWO64;
+ c2lo = (h2lo + TWO(52)*TWO96) - TWO(52)*TWO96;
+ c3lo = (h3lo + TWO(52)*TWO130) - TWO(52)*TWO130;
+
+ c0hi = (h0hi + TWO(52)*TWO32) - TWO(52)*TWO32;
+ c1hi = (h1hi + TWO(52)*TWO64) - TWO(52)*TWO64;
+ c2hi = (h2hi + TWO(52)*TWO96) - TWO(52)*TWO96;
+ c3hi = (h3hi + TWO(52)*TWO130) - TWO(52)*TWO130;
+
+ /*
+ * base 2^48 -> base 2^32 with last reduction step
+ */
+ x1 = (h1lo - c1lo) + c0lo;
+ x2 = (h2lo - c2lo) + c1lo;
+ x3 = (h3lo - c3lo) + c2lo;
+ x0 = (h0lo - c0lo) + c3lo * (5.0/TWO130);
+
+ x1 += (h1hi - c1hi) + c0hi;
+ x2 += (h2hi - c2hi) + c1hi;
+ x3 += (h3hi - c3hi) + c2hi;
+ x0 += (h0hi - c0hi) + c3hi * (5.0/TWO130);
+
+ /*
+ * store base 2^32, with bias
+ */
+ st->h[1].d = x1 + TWO(52)*TWO32;
+ st->h[2].d = x2 + TWO(52)*TWO64;
+ st->h[3].d = x3 + TWO(52)*TWO96;
+ st->h[0].d = x0 + TWO(52)*TWO0;
+
+ /*
+ * restore original FPU control register
+ */
+#if defined(__x86_64__)
+ asm volatile ("ldmxcsr %0"::"m"(mxcsr_orig));
+#elif defined(__PPC__)
+ asm volatile ("mtfsf 255,%0"::"f"(fpscr_orig));
+#elif defined(__s390x__)
+ asm volatile ("lfpc %0"::"m"(fpc_orig));
+#elif defined(__sparc__)
+ asm volatile ("ldx %0,%%fsr"::"m"(fsr_orig));
+#endif
+}
+
+void poly1305_emit(void *ctx, unsigned char mac[16], const u32 nonce[4])
+{
+ poly1305_internal *st = (poly1305_internal *) ctx;
+ u64 h0, h1, h2, h3, h4;
+ u32 g0, g1, g2, g3, g4;
+ u64 t;
+ u32 mask;
+
+ /*
+ * thanks to bias masking exponent gives integer result
+ */
+ h0 = st->h[0].u & 0x000fffffffffffffULL;
+ h1 = st->h[1].u & 0x000fffffffffffffULL;
+ h2 = st->h[2].u & 0x000fffffffffffffULL;
+ h3 = st->h[3].u & 0x000fffffffffffffULL;
+
+ /*
+ * can be partially reduced, so reduce...
+ */
+ h4 = h3>>32; h3 &= 0xffffffffU;
+ g4 = h4&-4;
+ h4 &= 3;
+ g4 += g4>>2;
+
+ h0 += g4;
+ h1 += h0>>32; h0 &= 0xffffffffU;
+ h2 += h1>>32; h1 &= 0xffffffffU;
+ h3 += h2>>32; h2 &= 0xffffffffU;
+
+ /* compute h + -p */
+ g0 = (u32)(t = h0 + 5);
+ g1 = (u32)(t = h1 + (t >> 32));
+ g2 = (u32)(t = h2 + (t >> 32));
+ g3 = (u32)(t = h3 + (t >> 32));
+ g4 = h4 + (u32)(t >> 32);
+
+ /* if there was carry, select g0-g3 */
+ mask = 0 - (g4 >> 2);
+ g0 &= mask;
+ g1 &= mask;
+ g2 &= mask;
+ g3 &= mask;
+ mask = ~mask;
+ g0 |= (h0 & mask);
+ g1 |= (h1 & mask);
+ g2 |= (h2 & mask);
+ g3 |= (h3 & mask);
+
+ /* mac = (h + nonce) % (2^128) */
+ g0 = (u32)(t = (u64)g0 + nonce[0]);
+ g1 = (u32)(t = (u64)g1 + (t >> 32) + nonce[1]);
+ g2 = (u32)(t = (u64)g2 + (t >> 32) + nonce[2]);
+ g3 = (u32)(t = (u64)g3 + (t >> 32) + nonce[3]);
+
+ U32TO8(mac + 0, g0);
+ U32TO8(mac + 4, g1);
+ U32TO8(mac + 8, g2);
+ U32TO8(mac + 12, g3);
+}
projects / openssl.git / commitdiff