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I2P: End-to-End encrypted and anonymous Internet
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368 lines
12 KiB
368 lines
12 KiB
#include "sc.h" |
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#include "crypto_int64.h" |
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#include "crypto_uint32.h" |
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#include "crypto_uint64.h" |
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static crypto_uint64 load_3(const unsigned char *in) |
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{ |
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crypto_uint64 result; |
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result = (crypto_uint64) in[0]; |
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result |= ((crypto_uint64) in[1]) << 8; |
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result |= ((crypto_uint64) in[2]) << 16; |
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return result; |
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} |
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static crypto_uint64 load_4(const unsigned char *in) |
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{ |
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crypto_uint64 result; |
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result = (crypto_uint64) in[0]; |
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result |= ((crypto_uint64) in[1]) << 8; |
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result |= ((crypto_uint64) in[2]) << 16; |
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result |= ((crypto_uint64) in[3]) << 24; |
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return result; |
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} |
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/* |
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Input: |
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a[0]+256*a[1]+...+256^31*a[31] = a |
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b[0]+256*b[1]+...+256^31*b[31] = b |
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c[0]+256*c[1]+...+256^31*c[31] = c |
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Output: |
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s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l |
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where l = 2^252 + 27742317777372353535851937790883648493. |
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*/ |
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void sc_muladd(unsigned char *s,const unsigned char *a,const unsigned char *b,const unsigned char *c) |
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{ |
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crypto_int64 a0 = 2097151 & load_3(a); |
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crypto_int64 a1 = 2097151 & (load_4(a + 2) >> 5); |
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crypto_int64 a2 = 2097151 & (load_3(a + 5) >> 2); |
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crypto_int64 a3 = 2097151 & (load_4(a + 7) >> 7); |
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crypto_int64 a4 = 2097151 & (load_4(a + 10) >> 4); |
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crypto_int64 a5 = 2097151 & (load_3(a + 13) >> 1); |
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crypto_int64 a6 = 2097151 & (load_4(a + 15) >> 6); |
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crypto_int64 a7 = 2097151 & (load_3(a + 18) >> 3); |
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crypto_int64 a8 = 2097151 & load_3(a + 21); |
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crypto_int64 a9 = 2097151 & (load_4(a + 23) >> 5); |
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crypto_int64 a10 = 2097151 & (load_3(a + 26) >> 2); |
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crypto_int64 a11 = (load_4(a + 28) >> 7); |
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crypto_int64 b0 = 2097151 & load_3(b); |
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crypto_int64 b1 = 2097151 & (load_4(b + 2) >> 5); |
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crypto_int64 b2 = 2097151 & (load_3(b + 5) >> 2); |
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crypto_int64 b3 = 2097151 & (load_4(b + 7) >> 7); |
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crypto_int64 b4 = 2097151 & (load_4(b + 10) >> 4); |
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crypto_int64 b5 = 2097151 & (load_3(b + 13) >> 1); |
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crypto_int64 b6 = 2097151 & (load_4(b + 15) >> 6); |
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crypto_int64 b7 = 2097151 & (load_3(b + 18) >> 3); |
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crypto_int64 b8 = 2097151 & load_3(b + 21); |
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crypto_int64 b9 = 2097151 & (load_4(b + 23) >> 5); |
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crypto_int64 b10 = 2097151 & (load_3(b + 26) >> 2); |
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crypto_int64 b11 = (load_4(b + 28) >> 7); |
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crypto_int64 c0 = 2097151 & load_3(c); |
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crypto_int64 c1 = 2097151 & (load_4(c + 2) >> 5); |
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crypto_int64 c2 = 2097151 & (load_3(c + 5) >> 2); |
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crypto_int64 c3 = 2097151 & (load_4(c + 7) >> 7); |
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crypto_int64 c4 = 2097151 & (load_4(c + 10) >> 4); |
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crypto_int64 c5 = 2097151 & (load_3(c + 13) >> 1); |
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crypto_int64 c6 = 2097151 & (load_4(c + 15) >> 6); |
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crypto_int64 c7 = 2097151 & (load_3(c + 18) >> 3); |
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crypto_int64 c8 = 2097151 & load_3(c + 21); |
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crypto_int64 c9 = 2097151 & (load_4(c + 23) >> 5); |
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crypto_int64 c10 = 2097151 & (load_3(c + 26) >> 2); |
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crypto_int64 c11 = (load_4(c + 28) >> 7); |
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crypto_int64 s0; |
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crypto_int64 s1; |
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crypto_int64 s2; |
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crypto_int64 s3; |
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crypto_int64 s4; |
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crypto_int64 s5; |
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crypto_int64 s6; |
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crypto_int64 s7; |
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crypto_int64 s8; |
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crypto_int64 s9; |
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crypto_int64 s10; |
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crypto_int64 s11; |
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crypto_int64 s12; |
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crypto_int64 s13; |
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crypto_int64 s14; |
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crypto_int64 s15; |
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crypto_int64 s16; |
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crypto_int64 s17; |
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crypto_int64 s18; |
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crypto_int64 s19; |
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crypto_int64 s20; |
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crypto_int64 s21; |
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crypto_int64 s22; |
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crypto_int64 s23; |
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crypto_int64 carry0; |
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crypto_int64 carry1; |
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crypto_int64 carry2; |
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crypto_int64 carry3; |
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crypto_int64 carry4; |
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crypto_int64 carry5; |
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crypto_int64 carry6; |
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crypto_int64 carry7; |
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crypto_int64 carry8; |
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crypto_int64 carry9; |
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crypto_int64 carry10; |
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crypto_int64 carry11; |
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crypto_int64 carry12; |
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crypto_int64 carry13; |
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crypto_int64 carry14; |
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crypto_int64 carry15; |
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crypto_int64 carry16; |
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crypto_int64 carry17; |
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crypto_int64 carry18; |
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crypto_int64 carry19; |
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crypto_int64 carry20; |
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crypto_int64 carry21; |
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crypto_int64 carry22; |
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s0 = c0 + a0*b0; |
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s1 = c1 + a0*b1 + a1*b0; |
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s2 = c2 + a0*b2 + a1*b1 + a2*b0; |
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s3 = c3 + a0*b3 + a1*b2 + a2*b1 + a3*b0; |
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s4 = c4 + a0*b4 + a1*b3 + a2*b2 + a3*b1 + a4*b0; |
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s5 = c5 + a0*b5 + a1*b4 + a2*b3 + a3*b2 + a4*b1 + a5*b0; |
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s6 = c6 + a0*b6 + a1*b5 + a2*b4 + a3*b3 + a4*b2 + a5*b1 + a6*b0; |
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s7 = c7 + a0*b7 + a1*b6 + a2*b5 + a3*b4 + a4*b3 + a5*b2 + a6*b1 + a7*b0; |
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s8 = c8 + a0*b8 + a1*b7 + a2*b6 + a3*b5 + a4*b4 + a5*b3 + a6*b2 + a7*b1 + a8*b0; |
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s9 = c9 + a0*b9 + a1*b8 + a2*b7 + a3*b6 + a4*b5 + a5*b4 + a6*b3 + a7*b2 + a8*b1 + a9*b0; |
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s10 = c10 + a0*b10 + a1*b9 + a2*b8 + a3*b7 + a4*b6 + a5*b5 + a6*b4 + a7*b3 + a8*b2 + a9*b1 + a10*b0; |
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s11 = c11 + a0*b11 + a1*b10 + a2*b9 + a3*b8 + a4*b7 + a5*b6 + a6*b5 + a7*b4 + a8*b3 + a9*b2 + a10*b1 + a11*b0; |
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s12 = a1*b11 + a2*b10 + a3*b9 + a4*b8 + a5*b7 + a6*b6 + a7*b5 + a8*b4 + a9*b3 + a10*b2 + a11*b1; |
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s13 = a2*b11 + a3*b10 + a4*b9 + a5*b8 + a6*b7 + a7*b6 + a8*b5 + a9*b4 + a10*b3 + a11*b2; |
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s14 = a3*b11 + a4*b10 + a5*b9 + a6*b8 + a7*b7 + a8*b6 + a9*b5 + a10*b4 + a11*b3; |
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s15 = a4*b11 + a5*b10 + a6*b9 + a7*b8 + a8*b7 + a9*b6 + a10*b5 + a11*b4; |
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s16 = a5*b11 + a6*b10 + a7*b9 + a8*b8 + a9*b7 + a10*b6 + a11*b5; |
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s17 = a6*b11 + a7*b10 + a8*b9 + a9*b8 + a10*b7 + a11*b6; |
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s18 = a7*b11 + a8*b10 + a9*b9 + a10*b8 + a11*b7; |
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s19 = a8*b11 + a9*b10 + a10*b9 + a11*b8; |
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s20 = a9*b11 + a10*b10 + a11*b9; |
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s21 = a10*b11 + a11*b10; |
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s22 = a11*b11; |
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s23 = 0; |
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carry0 = (s0 + (1<<20)) >> 21; s1 += carry0; s0 -= carry0 << 21; |
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carry2 = (s2 + (1<<20)) >> 21; s3 += carry2; s2 -= carry2 << 21; |
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carry4 = (s4 + (1<<20)) >> 21; s5 += carry4; s4 -= carry4 << 21; |
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carry6 = (s6 + (1<<20)) >> 21; s7 += carry6; s6 -= carry6 << 21; |
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carry8 = (s8 + (1<<20)) >> 21; s9 += carry8; s8 -= carry8 << 21; |
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carry10 = (s10 + (1<<20)) >> 21; s11 += carry10; s10 -= carry10 << 21; |
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carry12 = (s12 + (1<<20)) >> 21; s13 += carry12; s12 -= carry12 << 21; |
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carry14 = (s14 + (1<<20)) >> 21; s15 += carry14; s14 -= carry14 << 21; |
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carry16 = (s16 + (1<<20)) >> 21; s17 += carry16; s16 -= carry16 << 21; |
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carry18 = (s18 + (1<<20)) >> 21; s19 += carry18; s18 -= carry18 << 21; |
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carry20 = (s20 + (1<<20)) >> 21; s21 += carry20; s20 -= carry20 << 21; |
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carry22 = (s22 + (1<<20)) >> 21; s23 += carry22; s22 -= carry22 << 21; |
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carry1 = (s1 + (1<<20)) >> 21; s2 += carry1; s1 -= carry1 << 21; |
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carry3 = (s3 + (1<<20)) >> 21; s4 += carry3; s3 -= carry3 << 21; |
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carry5 = (s5 + (1<<20)) >> 21; s6 += carry5; s5 -= carry5 << 21; |
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carry7 = (s7 + (1<<20)) >> 21; s8 += carry7; s7 -= carry7 << 21; |
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carry9 = (s9 + (1<<20)) >> 21; s10 += carry9; s9 -= carry9 << 21; |
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carry11 = (s11 + (1<<20)) >> 21; s12 += carry11; s11 -= carry11 << 21; |
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carry13 = (s13 + (1<<20)) >> 21; s14 += carry13; s13 -= carry13 << 21; |
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carry15 = (s15 + (1<<20)) >> 21; s16 += carry15; s15 -= carry15 << 21; |
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carry17 = (s17 + (1<<20)) >> 21; s18 += carry17; s17 -= carry17 << 21; |
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carry19 = (s19 + (1<<20)) >> 21; s20 += carry19; s19 -= carry19 << 21; |
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carry21 = (s21 + (1<<20)) >> 21; s22 += carry21; s21 -= carry21 << 21; |
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s11 += s23 * 666643; |
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s12 += s23 * 470296; |
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s13 += s23 * 654183; |
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s14 -= s23 * 997805; |
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s15 += s23 * 136657; |
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s16 -= s23 * 683901; |
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s23 = 0; |
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s10 += s22 * 666643; |
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s11 += s22 * 470296; |
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s12 += s22 * 654183; |
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s13 -= s22 * 997805; |
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s14 += s22 * 136657; |
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s15 -= s22 * 683901; |
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s22 = 0; |
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s9 += s21 * 666643; |
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s10 += s21 * 470296; |
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s11 += s21 * 654183; |
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s12 -= s21 * 997805; |
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s13 += s21 * 136657; |
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s14 -= s21 * 683901; |
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s21 = 0; |
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s8 += s20 * 666643; |
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s9 += s20 * 470296; |
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s10 += s20 * 654183; |
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s11 -= s20 * 997805; |
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s12 += s20 * 136657; |
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s13 -= s20 * 683901; |
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s20 = 0; |
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s7 += s19 * 666643; |
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s8 += s19 * 470296; |
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s9 += s19 * 654183; |
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s10 -= s19 * 997805; |
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s11 += s19 * 136657; |
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s12 -= s19 * 683901; |
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s19 = 0; |
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s6 += s18 * 666643; |
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s7 += s18 * 470296; |
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s8 += s18 * 654183; |
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s9 -= s18 * 997805; |
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s10 += s18 * 136657; |
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s11 -= s18 * 683901; |
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s18 = 0; |
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carry6 = (s6 + (1<<20)) >> 21; s7 += carry6; s6 -= carry6 << 21; |
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carry8 = (s8 + (1<<20)) >> 21; s9 += carry8; s8 -= carry8 << 21; |
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carry10 = (s10 + (1<<20)) >> 21; s11 += carry10; s10 -= carry10 << 21; |
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carry12 = (s12 + (1<<20)) >> 21; s13 += carry12; s12 -= carry12 << 21; |
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carry14 = (s14 + (1<<20)) >> 21; s15 += carry14; s14 -= carry14 << 21; |
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carry16 = (s16 + (1<<20)) >> 21; s17 += carry16; s16 -= carry16 << 21; |
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carry7 = (s7 + (1<<20)) >> 21; s8 += carry7; s7 -= carry7 << 21; |
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carry9 = (s9 + (1<<20)) >> 21; s10 += carry9; s9 -= carry9 << 21; |
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carry11 = (s11 + (1<<20)) >> 21; s12 += carry11; s11 -= carry11 << 21; |
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carry13 = (s13 + (1<<20)) >> 21; s14 += carry13; s13 -= carry13 << 21; |
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carry15 = (s15 + (1<<20)) >> 21; s16 += carry15; s15 -= carry15 << 21; |
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s5 += s17 * 666643; |
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s6 += s17 * 470296; |
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s7 += s17 * 654183; |
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s8 -= s17 * 997805; |
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s9 += s17 * 136657; |
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s10 -= s17 * 683901; |
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s17 = 0; |
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s4 += s16 * 666643; |
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s5 += s16 * 470296; |
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s6 += s16 * 654183; |
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s7 -= s16 * 997805; |
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s8 += s16 * 136657; |
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s9 -= s16 * 683901; |
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s16 = 0; |
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s3 += s15 * 666643; |
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s4 += s15 * 470296; |
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s5 += s15 * 654183; |
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s6 -= s15 * 997805; |
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s7 += s15 * 136657; |
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s8 -= s15 * 683901; |
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s15 = 0; |
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s2 += s14 * 666643; |
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s3 += s14 * 470296; |
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s4 += s14 * 654183; |
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s5 -= s14 * 997805; |
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s6 += s14 * 136657; |
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s7 -= s14 * 683901; |
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s14 = 0; |
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s1 += s13 * 666643; |
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s2 += s13 * 470296; |
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s3 += s13 * 654183; |
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s4 -= s13 * 997805; |
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s5 += s13 * 136657; |
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s6 -= s13 * 683901; |
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s13 = 0; |
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s0 += s12 * 666643; |
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s1 += s12 * 470296; |
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s2 += s12 * 654183; |
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s3 -= s12 * 997805; |
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s4 += s12 * 136657; |
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s5 -= s12 * 683901; |
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s12 = 0; |
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carry0 = (s0 + (1<<20)) >> 21; s1 += carry0; s0 -= carry0 << 21; |
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carry2 = (s2 + (1<<20)) >> 21; s3 += carry2; s2 -= carry2 << 21; |
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carry4 = (s4 + (1<<20)) >> 21; s5 += carry4; s4 -= carry4 << 21; |
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carry6 = (s6 + (1<<20)) >> 21; s7 += carry6; s6 -= carry6 << 21; |
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carry8 = (s8 + (1<<20)) >> 21; s9 += carry8; s8 -= carry8 << 21; |
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carry10 = (s10 + (1<<20)) >> 21; s11 += carry10; s10 -= carry10 << 21; |
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carry1 = (s1 + (1<<20)) >> 21; s2 += carry1; s1 -= carry1 << 21; |
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carry3 = (s3 + (1<<20)) >> 21; s4 += carry3; s3 -= carry3 << 21; |
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carry5 = (s5 + (1<<20)) >> 21; s6 += carry5; s5 -= carry5 << 21; |
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carry7 = (s7 + (1<<20)) >> 21; s8 += carry7; s7 -= carry7 << 21; |
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carry9 = (s9 + (1<<20)) >> 21; s10 += carry9; s9 -= carry9 << 21; |
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carry11 = (s11 + (1<<20)) >> 21; s12 += carry11; s11 -= carry11 << 21; |
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s0 += s12 * 666643; |
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s1 += s12 * 470296; |
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s2 += s12 * 654183; |
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s3 -= s12 * 997805; |
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s4 += s12 * 136657; |
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s5 -= s12 * 683901; |
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s12 = 0; |
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carry0 = s0 >> 21; s1 += carry0; s0 -= carry0 << 21; |
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carry1 = s1 >> 21; s2 += carry1; s1 -= carry1 << 21; |
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carry2 = s2 >> 21; s3 += carry2; s2 -= carry2 << 21; |
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carry3 = s3 >> 21; s4 += carry3; s3 -= carry3 << 21; |
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carry4 = s4 >> 21; s5 += carry4; s4 -= carry4 << 21; |
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carry5 = s5 >> 21; s6 += carry5; s5 -= carry5 << 21; |
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carry6 = s6 >> 21; s7 += carry6; s6 -= carry6 << 21; |
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carry7 = s7 >> 21; s8 += carry7; s7 -= carry7 << 21; |
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carry8 = s8 >> 21; s9 += carry8; s8 -= carry8 << 21; |
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carry9 = s9 >> 21; s10 += carry9; s9 -= carry9 << 21; |
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carry10 = s10 >> 21; s11 += carry10; s10 -= carry10 << 21; |
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carry11 = s11 >> 21; s12 += carry11; s11 -= carry11 << 21; |
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s0 += s12 * 666643; |
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s1 += s12 * 470296; |
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s2 += s12 * 654183; |
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s3 -= s12 * 997805; |
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s4 += s12 * 136657; |
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s5 -= s12 * 683901; |
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s12 = 0; |
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carry0 = s0 >> 21; s1 += carry0; s0 -= carry0 << 21; |
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carry1 = s1 >> 21; s2 += carry1; s1 -= carry1 << 21; |
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carry2 = s2 >> 21; s3 += carry2; s2 -= carry2 << 21; |
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carry3 = s3 >> 21; s4 += carry3; s3 -= carry3 << 21; |
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carry4 = s4 >> 21; s5 += carry4; s4 -= carry4 << 21; |
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carry5 = s5 >> 21; s6 += carry5; s5 -= carry5 << 21; |
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carry6 = s6 >> 21; s7 += carry6; s6 -= carry6 << 21; |
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carry7 = s7 >> 21; s8 += carry7; s7 -= carry7 << 21; |
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carry8 = s8 >> 21; s9 += carry8; s8 -= carry8 << 21; |
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carry9 = s9 >> 21; s10 += carry9; s9 -= carry9 << 21; |
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carry10 = s10 >> 21; s11 += carry10; s10 -= carry10 << 21; |
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s[0] = s0 >> 0; |
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s[1] = s0 >> 8; |
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s[2] = (s0 >> 16) | (s1 << 5); |
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s[3] = s1 >> 3; |
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s[4] = s1 >> 11; |
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s[5] = (s1 >> 19) | (s2 << 2); |
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s[6] = s2 >> 6; |
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s[7] = (s2 >> 14) | (s3 << 7); |
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s[8] = s3 >> 1; |
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s[9] = s3 >> 9; |
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s[10] = (s3 >> 17) | (s4 << 4); |
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s[11] = s4 >> 4; |
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s[12] = s4 >> 12; |
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s[13] = (s4 >> 20) | (s5 << 1); |
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s[14] = s5 >> 7; |
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s[15] = (s5 >> 15) | (s6 << 6); |
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s[16] = s6 >> 2; |
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s[17] = s6 >> 10; |
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s[18] = (s6 >> 18) | (s7 << 3); |
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s[19] = s7 >> 5; |
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s[20] = s7 >> 13; |
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s[21] = s8 >> 0; |
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s[22] = s8 >> 8; |
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s[23] = (s8 >> 16) | (s9 << 5); |
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s[24] = s9 >> 3; |
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s[25] = s9 >> 11; |
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s[26] = (s9 >> 19) | (s10 << 2); |
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s[27] = s10 >> 6; |
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s[28] = (s10 >> 14) | (s11 << 7); |
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s[29] = s11 >> 1; |
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s[30] = s11 >> 9; |
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s[31] = s11 >> 17; |
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}
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