diff options
Diffstat (limited to 'node/Poly1305.cpp')
| -rw-r--r-- | node/Poly1305.cpp | 511 |
1 files changed, 507 insertions, 4 deletions
diff --git a/node/Poly1305.cpp b/node/Poly1305.cpp index 230b2eff..b78071f6 100644 --- a/node/Poly1305.cpp +++ b/node/Poly1305.cpp @@ -7,14 +7,21 @@ Public domain. #include "Constants.hpp" #include "Poly1305.hpp" +#include <stdio.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> + #ifdef __WINDOWS__ #pragma warning(disable: 4146) #endif namespace ZeroTier { -////////////////////////////////////////////////////////////////////////////// -////////////////////////////////////////////////////////////////////////////// +#if 0 + +// "Naive" implementation, which is slower... might still want this on some older +// or weird platforms if the later versions have issues. static inline void add(unsigned int h[17],const unsigned int c[17]) { @@ -113,13 +120,509 @@ static inline int crypto_onetimeauth(unsigned char *out,const unsigned char *in, return 0; } +void Poly1305::compute(void *auth,const void *data,unsigned int len,const void *key) + throw() +{ + crypto_onetimeauth((unsigned char *)auth,(const unsigned char *)data,len,(const unsigned char *)key); +} + +#endif + +namespace { + +typedef struct poly1305_context { + size_t aligner; + unsigned char opaque[136]; +} poly1305_context; + +#if (defined(_MSC_VER) || defined(__GNUC__)) && (defined(__amd64) || defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) || defined(__AMD64) || defined(__AMD64__)) + +////////////////////////////////////////////////////////////////////////////// +// 128-bit implementation for MSC and GCC from Poly1305-donna + +#if defined(_MSC_VER) + #include <intrin.h> + + typedef struct uint128_t { + unsigned long long lo; + unsigned long long hi; + } uint128_t; + + #define MUL(out, x, y) out.lo = _umul128((x), (y), &out.hi) + #define ADD(out, in) { unsigned long long t = out.lo; out.lo += in.lo; out.hi += (out.lo < t) + in.hi; } + #define ADDLO(out, in) { unsigned long long t = out.lo; out.lo += in; out.hi += (out.lo < t); } + #define SHR(in, shift) (__shiftright128(in.lo, in.hi, (shift))) + #define LO(in) (in.lo) + +// #define POLY1305_NOINLINE __declspec(noinline) +#elif defined(__GNUC__) + #if defined(__SIZEOF_INT128__) + typedef unsigned __int128 uint128_t; + #else + typedef unsigned uint128_t __attribute__((mode(TI))); + #endif + + #define MUL(out, x, y) out = ((uint128_t)x * y) + #define ADD(out, in) out += in + #define ADDLO(out, in) out += in + #define SHR(in, shift) (unsigned long long)(in >> (shift)) + #define LO(in) (unsigned long long)(in) + +// #define POLY1305_NOINLINE __attribute__((noinline)) +#endif + +#define poly1305_block_size 16 + +/* 17 + sizeof(size_t) + 8*sizeof(unsigned long long) */ +typedef struct poly1305_state_internal_t { + unsigned long long r[3]; + unsigned long long h[3]; + unsigned long long pad[2]; + size_t leftover; + unsigned char buffer[poly1305_block_size]; + unsigned char final; +} poly1305_state_internal_t; + +/* interpret eight 8 bit unsigned integers as a 64 bit unsigned integer in little endian */ +static inline unsigned long long +U8TO64(const unsigned char *p) { + return + (((unsigned long long)(p[0] & 0xff) ) | + ((unsigned long long)(p[1] & 0xff) << 8) | + ((unsigned long long)(p[2] & 0xff) << 16) | + ((unsigned long long)(p[3] & 0xff) << 24) | + ((unsigned long long)(p[4] & 0xff) << 32) | + ((unsigned long long)(p[5] & 0xff) << 40) | + ((unsigned long long)(p[6] & 0xff) << 48) | + ((unsigned long long)(p[7] & 0xff) << 56)); +} + +/* store a 64 bit unsigned integer as eight 8 bit unsigned integers in little endian */ +static inline void +U64TO8(unsigned char *p, unsigned long long v) { + p[0] = (v ) & 0xff; + p[1] = (v >> 8) & 0xff; + p[2] = (v >> 16) & 0xff; + p[3] = (v >> 24) & 0xff; + p[4] = (v >> 32) & 0xff; + p[5] = (v >> 40) & 0xff; + p[6] = (v >> 48) & 0xff; + p[7] = (v >> 56) & 0xff; +} + +static inline void +poly1305_init(poly1305_context *ctx, const unsigned char key[32]) { + poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx; + unsigned long long t0,t1; + + /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */ + t0 = U8TO64(&key[0]); + t1 = U8TO64(&key[8]); + + st->r[0] = ( t0 ) & 0xffc0fffffff; + st->r[1] = ((t0 >> 44) | (t1 << 20)) & 0xfffffc0ffff; + st->r[2] = ((t1 >> 24) ) & 0x00ffffffc0f; + + /* h = 0 */ + st->h[0] = 0; + st->h[1] = 0; + st->h[2] = 0; + + /* save pad for later */ + st->pad[0] = U8TO64(&key[16]); + st->pad[1] = U8TO64(&key[24]); + + st->leftover = 0; + st->final = 0; +} + +static inline void +poly1305_blocks(poly1305_state_internal_t *st, const unsigned char *m, size_t bytes) { + const unsigned long long hibit = (st->final) ? 0 : ((unsigned long long)1 << 40); /* 1 << 128 */ + unsigned long long r0,r1,r2; + unsigned long long s1,s2; + unsigned long long h0,h1,h2; + unsigned long long c; + uint128_t d0,d1,d2,d; + + r0 = st->r[0]; + r1 = st->r[1]; + r2 = st->r[2]; + + h0 = st->h[0]; + h1 = st->h[1]; + h2 = st->h[2]; + + s1 = r1 * (5 << 2); + s2 = r2 * (5 << 2); + + while (bytes >= poly1305_block_size) { + unsigned long long t0,t1; + + /* h += m[i] */ + t0 = U8TO64(&m[0]); + t1 = U8TO64(&m[8]); + + h0 += (( t0 ) & 0xfffffffffff); + h1 += (((t0 >> 44) | (t1 << 20)) & 0xfffffffffff); + h2 += (((t1 >> 24) ) & 0x3ffffffffff) | hibit; + + /* h *= r */ + MUL(d0, h0, r0); MUL(d, h1, s2); ADD(d0, d); MUL(d, h2, s1); ADD(d0, d); + MUL(d1, h0, r1); MUL(d, h1, r0); ADD(d1, d); MUL(d, h2, s2); ADD(d1, d); + MUL(d2, h0, r2); MUL(d, h1, r1); ADD(d2, d); MUL(d, h2, r0); ADD(d2, d); + + /* (partial) h %= p */ + c = SHR(d0, 44); h0 = LO(d0) & 0xfffffffffff; + ADDLO(d1, c); c = SHR(d1, 44); h1 = LO(d1) & 0xfffffffffff; + ADDLO(d2, c); c = SHR(d2, 42); h2 = LO(d2) & 0x3ffffffffff; + h0 += c * 5; c = (h0 >> 44); h0 = h0 & 0xfffffffffff; + h1 += c; + + m += poly1305_block_size; + bytes -= poly1305_block_size; + } + + st->h[0] = h0; + st->h[1] = h1; + st->h[2] = h2; +} + +static inline void +poly1305_finish(poly1305_context *ctx, unsigned char mac[16]) { + poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx; + unsigned long long h0,h1,h2,c; + unsigned long long g0,g1,g2; + unsigned long long t0,t1; + + /* process the remaining block */ + if (st->leftover) { + size_t i = st->leftover; + st->buffer[i] = 1; + for (i = i + 1; i < poly1305_block_size; i++) + st->buffer[i] = 0; + st->final = 1; + poly1305_blocks(st, st->buffer, poly1305_block_size); + } + + /* fully carry h */ + h0 = st->h[0]; + h1 = st->h[1]; + h2 = st->h[2]; + + c = (h1 >> 44); h1 &= 0xfffffffffff; + h2 += c; c = (h2 >> 42); h2 &= 0x3ffffffffff; + h0 += c * 5; c = (h0 >> 44); h0 &= 0xfffffffffff; + h1 += c; c = (h1 >> 44); h1 &= 0xfffffffffff; + h2 += c; c = (h2 >> 42); h2 &= 0x3ffffffffff; + h0 += c * 5; c = (h0 >> 44); h0 &= 0xfffffffffff; + h1 += c; + + /* compute h + -p */ + g0 = h0 + 5; c = (g0 >> 44); g0 &= 0xfffffffffff; + g1 = h1 + c; c = (g1 >> 44); g1 &= 0xfffffffffff; + g2 = h2 + c - ((unsigned long long)1 << 42); + + /* select h if h < p, or h + -p if h >= p */ + c = (g2 >> ((sizeof(unsigned long long) * 8) - 1)) - 1; + g0 &= c; + g1 &= c; + g2 &= c; + c = ~c; + h0 = (h0 & c) | g0; + h1 = (h1 & c) | g1; + h2 = (h2 & c) | g2; + + /* h = (h + pad) */ + t0 = st->pad[0]; + t1 = st->pad[1]; + + h0 += (( t0 ) & 0xfffffffffff) ; c = (h0 >> 44); h0 &= 0xfffffffffff; + h1 += (((t0 >> 44) | (t1 << 20)) & 0xfffffffffff) + c; c = (h1 >> 44); h1 &= 0xfffffffffff; + h2 += (((t1 >> 24) ) & 0x3ffffffffff) + c; h2 &= 0x3ffffffffff; + + /* mac = h % (2^128) */ + h0 = ((h0 ) | (h1 << 44)); + h1 = ((h1 >> 20) | (h2 << 24)); + + U64TO8(&mac[0], h0); + U64TO8(&mac[8], h1); + + /* zero out the state */ + st->h[0] = 0; + st->h[1] = 0; + st->h[2] = 0; + st->r[0] = 0; + st->r[1] = 0; + st->r[2] = 0; + st->pad[0] = 0; + st->pad[1] = 0; +} + ////////////////////////////////////////////////////////////////////////////// + +#else + ////////////////////////////////////////////////////////////////////////////// +// More portable 64-bit implementation + +#define poly1305_block_size 16 + +/* 17 + sizeof(size_t) + 14*sizeof(unsigned long) */ +typedef struct poly1305_state_internal_t { + unsigned long r[5]; + unsigned long h[5]; + unsigned long pad[4]; + size_t leftover; + unsigned char buffer[poly1305_block_size]; + unsigned char final; +} poly1305_state_internal_t; + +/* interpret four 8 bit unsigned integers as a 32 bit unsigned integer in little endian */ +static unsigned long +U8TO32(const unsigned char *p) { + return + (((unsigned long)(p[0] & 0xff) ) | + ((unsigned long)(p[1] & 0xff) << 8) | + ((unsigned long)(p[2] & 0xff) << 16) | + ((unsigned long)(p[3] & 0xff) << 24)); +} + +/* store a 32 bit unsigned integer as four 8 bit unsigned integers in little endian */ +static void +U32TO8(unsigned char *p, unsigned long v) { + p[0] = (v ) & 0xff; + p[1] = (v >> 8) & 0xff; + p[2] = (v >> 16) & 0xff; + p[3] = (v >> 24) & 0xff; +} + +static inline void +poly1305_init(poly1305_context *ctx, const unsigned char key[32]) { + poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx; + + /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */ + st->r[0] = (U8TO32(&key[ 0]) ) & 0x3ffffff; + st->r[1] = (U8TO32(&key[ 3]) >> 2) & 0x3ffff03; + st->r[2] = (U8TO32(&key[ 6]) >> 4) & 0x3ffc0ff; + st->r[3] = (U8TO32(&key[ 9]) >> 6) & 0x3f03fff; + st->r[4] = (U8TO32(&key[12]) >> 8) & 0x00fffff; + + /* h = 0 */ + st->h[0] = 0; + st->h[1] = 0; + st->h[2] = 0; + st->h[3] = 0; + st->h[4] = 0; + + /* save pad for later */ + st->pad[0] = U8TO32(&key[16]); + st->pad[1] = U8TO32(&key[20]); + st->pad[2] = U8TO32(&key[24]); + st->pad[3] = U8TO32(&key[28]); + + st->leftover = 0; + st->final = 0; +} + +static inline void +poly1305_blocks(poly1305_state_internal_t *st, const unsigned char *m, size_t bytes) { + const unsigned long hibit = (st->final) ? 0 : (1 << 24); /* 1 << 128 */ + unsigned long r0,r1,r2,r3,r4; + unsigned long s1,s2,s3,s4; + unsigned long h0,h1,h2,h3,h4; + unsigned long long d0,d1,d2,d3,d4; + unsigned long c; + + r0 = st->r[0]; + r1 = st->r[1]; + r2 = st->r[2]; + r3 = st->r[3]; + r4 = st->r[4]; + + s1 = r1 * 5; + s2 = r2 * 5; + s3 = r3 * 5; + s4 = r4 * 5; + + h0 = st->h[0]; + h1 = st->h[1]; + h2 = st->h[2]; + h3 = st->h[3]; + h4 = st->h[4]; + + while (bytes >= poly1305_block_size) { + /* h += m[i] */ + h0 += (U8TO32(m+ 0) ) & 0x3ffffff; + h1 += (U8TO32(m+ 3) >> 2) & 0x3ffffff; + h2 += (U8TO32(m+ 6) >> 4) & 0x3ffffff; + h3 += (U8TO32(m+ 9) >> 6) & 0x3ffffff; + h4 += (U8TO32(m+12) >> 8) | hibit; + + /* h *= r */ + d0 = ((unsigned long long)h0 * r0) + ((unsigned long long)h1 * s4) + ((unsigned long long)h2 * s3) + ((unsigned long long)h3 * s2) + ((unsigned long long)h4 * s1); + d1 = ((unsigned long long)h0 * r1) + ((unsigned long long)h1 * r0) + ((unsigned long long)h2 * s4) + ((unsigned long long)h3 * s3) + ((unsigned long long)h4 * s2); + d2 = ((unsigned long long)h0 * r2) + ((unsigned long long)h1 * r1) + ((unsigned long long)h2 * r0) + ((unsigned long long)h3 * s4) + ((unsigned long long)h4 * s3); + d3 = ((unsigned long long)h0 * r3) + ((unsigned long long)h1 * r2) + ((unsigned long long)h2 * r1) + ((unsigned long long)h3 * r0) + ((unsigned long long)h4 * s4); + d4 = ((unsigned long long)h0 * r4) + ((unsigned long long)h1 * r3) + ((unsigned long long)h2 * r2) + ((unsigned long long)h3 * r1) + ((unsigned long long)h4 * r0); + + /* (partial) h %= p */ + c = (unsigned long)(d0 >> 26); h0 = (unsigned long)d0 & 0x3ffffff; + d1 += c; c = (unsigned long)(d1 >> 26); h1 = (unsigned long)d1 & 0x3ffffff; + d2 += c; c = (unsigned long)(d2 >> 26); h2 = (unsigned long)d2 & 0x3ffffff; + d3 += c; c = (unsigned long)(d3 >> 26); h3 = (unsigned long)d3 & 0x3ffffff; + d4 += c; c = (unsigned long)(d4 >> 26); h4 = (unsigned long)d4 & 0x3ffffff; + h0 += c * 5; c = (h0 >> 26); h0 = h0 & 0x3ffffff; + h1 += c; + + m += poly1305_block_size; + bytes -= poly1305_block_size; + } + + st->h[0] = h0; + st->h[1] = h1; + st->h[2] = h2; + st->h[3] = h3; + st->h[4] = h4; +} + +static inline void +poly1305_finish(poly1305_context *ctx, unsigned char mac[16]) { + poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx; + unsigned long h0,h1,h2,h3,h4,c; + unsigned long g0,g1,g2,g3,g4; + unsigned long long f; + unsigned long mask; + + /* process the remaining block */ + if (st->leftover) { + size_t i = st->leftover; + st->buffer[i++] = 1; + for (; i < poly1305_block_size; i++) + st->buffer[i] = 0; + st->final = 1; + poly1305_blocks(st, st->buffer, poly1305_block_size); + } + + /* fully carry h */ + h0 = st->h[0]; + h1 = st->h[1]; + h2 = st->h[2]; + h3 = st->h[3]; + h4 = st->h[4]; + + c = h1 >> 26; h1 = h1 & 0x3ffffff; + h2 += c; c = h2 >> 26; h2 = h2 & 0x3ffffff; + h3 += c; c = h3 >> 26; h3 = h3 & 0x3ffffff; + h4 += c; c = h4 >> 26; h4 = h4 & 0x3ffffff; + h0 += c * 5; c = h0 >> 26; h0 = h0 & 0x3ffffff; + h1 += c; + + /* compute h + -p */ + g0 = h0 + 5; c = g0 >> 26; g0 &= 0x3ffffff; + g1 = h1 + c; c = g1 >> 26; g1 &= 0x3ffffff; + g2 = h2 + c; c = g2 >> 26; g2 &= 0x3ffffff; + g3 = h3 + c; c = g3 >> 26; g3 &= 0x3ffffff; + g4 = h4 + c - (1 << 26); + + /* select h if h < p, or h + -p if h >= p */ + mask = (g4 >> ((sizeof(unsigned long) * 8) - 1)) - 1; + g0 &= mask; + g1 &= mask; + g2 &= mask; + g3 &= mask; + g4 &= mask; + mask = ~mask; + h0 = (h0 & mask) | g0; + h1 = (h1 & mask) | g1; + h2 = (h2 & mask) | g2; + h3 = (h3 & mask) | g3; + h4 = (h4 & mask) | g4; + + /* h = h % (2^128) */ + h0 = ((h0 ) | (h1 << 26)) & 0xffffffff; + h1 = ((h1 >> 6) | (h2 << 20)) & 0xffffffff; + h2 = ((h2 >> 12) | (h3 << 14)) & 0xffffffff; + h3 = ((h3 >> 18) | (h4 << 8)) & 0xffffffff; + + /* mac = (h + pad) % (2^128) */ + f = (unsigned long long)h0 + st->pad[0] ; h0 = (unsigned long)f; + f = (unsigned long long)h1 + st->pad[1] + (f >> 32); h1 = (unsigned long)f; + f = (unsigned long long)h2 + st->pad[2] + (f >> 32); h2 = (unsigned long)f; + f = (unsigned long long)h3 + st->pad[3] + (f >> 32); h3 = (unsigned long)f; + + U32TO8(mac + 0, h0); + U32TO8(mac + 4, h1); + U32TO8(mac + 8, h2); + U32TO8(mac + 12, h3); + + /* zero out the state */ + st->h[0] = 0; + st->h[1] = 0; + st->h[2] = 0; + st->h[3] = 0; + st->h[4] = 0; + st->r[0] = 0; + st->r[1] = 0; + st->r[2] = 0; + st->r[3] = 0; + st->r[4] = 0; + st->pad[0] = 0; + st->pad[1] = 0; + st->pad[2] = 0; + st->pad[3] = 0; +} + +////////////////////////////////////////////////////////////////////////////// + +#endif // MSC/GCC or not + +static inline void +poly1305_update(poly1305_context *ctx, const unsigned char *m, size_t bytes) { + poly1305_state_internal_t *st = (poly1305_state_internal_t *)ctx; + size_t i; + + /* handle leftover */ + if (st->leftover) { + size_t want = (poly1305_block_size - st->leftover); + if (want > bytes) + want = bytes; + for (i = 0; i < want; i++) + st->buffer[st->leftover + i] = m[i]; + bytes -= want; + m += want; + st->leftover += want; + if (st->leftover < poly1305_block_size) + return; + poly1305_blocks(st, st->buffer, poly1305_block_size); + st->leftover = 0; + } + + /* process full blocks */ + if (bytes >= poly1305_block_size) { + size_t want = (bytes & ~(poly1305_block_size - 1)); + poly1305_blocks(st, m, want); + m += want; + bytes -= want; + } + + /* store leftover */ + if (bytes) { + for (i = 0; i < bytes; i++) + st->buffer[st->leftover + i] = m[i]; + st->leftover += bytes; + } +} + +} // anonymous namespace void Poly1305::compute(void *auth,const void *data,unsigned int len,const void *key) - throw() + throw() { - crypto_onetimeauth((unsigned char *)auth,(const unsigned char *)data,len,(const unsigned char *)key); + poly1305_context ctx; + poly1305_init(&ctx,reinterpret_cast<const unsigned char *>(key)); + poly1305_update(&ctx,reinterpret_cast<const unsigned char *>(data),(size_t)len); + poly1305_finish(&ctx,reinterpret_cast<unsigned char *>(auth)); } } // namespace ZeroTier |