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126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
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#include <stdint.h>
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#include <stdlib.h>
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#include <sodium/crypto_core_salsa20.h>
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#include <sodium/private/common.h>
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static void
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crypto_core_salsa(unsigned char *out, const unsigned char *in,
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const unsigned char *k, const unsigned char *c,
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const int rounds)
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{
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uint32_t x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
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uint32_t j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
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int i;
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j0 = x0 = 0x61707865;
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j5 = x5 = 0x3320646e;
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j10 = x10 = 0x79622d32;
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j15 = x15 = 0x6b206574;
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if(c != NULL)
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{
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j0 = x0 = LOAD32_LE(c + 0);
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j5 = x5 = LOAD32_LE(c + 4);
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j10 = x10 = LOAD32_LE(c + 8);
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j15 = x15 = LOAD32_LE(c + 12);
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}
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j1 = x1 = LOAD32_LE(k + 0);
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j2 = x2 = LOAD32_LE(k + 4);
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j3 = x3 = LOAD32_LE(k + 8);
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j4 = x4 = LOAD32_LE(k + 12);
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j11 = x11 = LOAD32_LE(k + 16);
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j12 = x12 = LOAD32_LE(k + 20);
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j13 = x13 = LOAD32_LE(k + 24);
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j14 = x14 = LOAD32_LE(k + 28);
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j6 = x6 = LOAD32_LE(in + 0);
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j7 = x7 = LOAD32_LE(in + 4);
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j8 = x8 = LOAD32_LE(in + 8);
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j9 = x9 = LOAD32_LE(in + 12);
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for(i = 0; i < rounds; i += 2)
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{
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x4 ^= ROTL32(x0 + x12, 7);
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x8 ^= ROTL32(x4 + x0, 9);
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x12 ^= ROTL32(x8 + x4, 13);
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x0 ^= ROTL32(x12 + x8, 18);
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x9 ^= ROTL32(x5 + x1, 7);
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x13 ^= ROTL32(x9 + x5, 9);
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x1 ^= ROTL32(x13 + x9, 13);
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x5 ^= ROTL32(x1 + x13, 18);
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x14 ^= ROTL32(x10 + x6, 7);
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x2 ^= ROTL32(x14 + x10, 9);
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x6 ^= ROTL32(x2 + x14, 13);
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x10 ^= ROTL32(x6 + x2, 18);
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x3 ^= ROTL32(x15 + x11, 7);
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x7 ^= ROTL32(x3 + x15, 9);
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x11 ^= ROTL32(x7 + x3, 13);
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x15 ^= ROTL32(x11 + x7, 18);
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x1 ^= ROTL32(x0 + x3, 7);
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x2 ^= ROTL32(x1 + x0, 9);
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x3 ^= ROTL32(x2 + x1, 13);
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x0 ^= ROTL32(x3 + x2, 18);
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x6 ^= ROTL32(x5 + x4, 7);
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x7 ^= ROTL32(x6 + x5, 9);
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x4 ^= ROTL32(x7 + x6, 13);
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x5 ^= ROTL32(x4 + x7, 18);
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x11 ^= ROTL32(x10 + x9, 7);
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x8 ^= ROTL32(x11 + x10, 9);
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x9 ^= ROTL32(x8 + x11, 13);
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x10 ^= ROTL32(x9 + x8, 18);
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x12 ^= ROTL32(x15 + x14, 7);
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x13 ^= ROTL32(x12 + x15, 9);
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x14 ^= ROTL32(x13 + x12, 13);
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x15 ^= ROTL32(x14 + x13, 18);
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}
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STORE32_LE(out + 0, x0 + j0);
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STORE32_LE(out + 4, x1 + j1);
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STORE32_LE(out + 8, x2 + j2);
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STORE32_LE(out + 12, x3 + j3);
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STORE32_LE(out + 16, x4 + j4);
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STORE32_LE(out + 20, x5 + j5);
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STORE32_LE(out + 24, x6 + j6);
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STORE32_LE(out + 28, x7 + j7);
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STORE32_LE(out + 32, x8 + j8);
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STORE32_LE(out + 36, x9 + j9);
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STORE32_LE(out + 40, x10 + j10);
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STORE32_LE(out + 44, x11 + j11);
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STORE32_LE(out + 48, x12 + j12);
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STORE32_LE(out + 52, x13 + j13);
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STORE32_LE(out + 56, x14 + j14);
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STORE32_LE(out + 60, x15 + j15);
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}
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int
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crypto_core_salsa20(unsigned char *out, const unsigned char *in,
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const unsigned char *k, const unsigned char *c)
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{
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crypto_core_salsa(out, in, k, c, 20);
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return 0;
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}
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size_t
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crypto_core_salsa20_outputbytes(void)
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{
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return crypto_core_salsa20_OUTPUTBYTES;
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}
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size_t
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crypto_core_salsa20_inputbytes(void)
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{
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return crypto_core_salsa20_INPUTBYTES;
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}
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size_t
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crypto_core_salsa20_keybytes(void)
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{
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return crypto_core_salsa20_KEYBYTES;
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}
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size_t
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crypto_core_salsa20_constbytes(void)
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{
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return crypto_core_salsa20_CONSTBYTES;
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}
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