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103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
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#include <stdint.h>
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#include <stdlib.h>
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#include <sodium/crypto_core_hchacha20.h>
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#include <sodium/private/common.h>
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#define QUARTERROUND(A, B, C, D) \
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do \
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{ \
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A += B; \
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D = ROTL32(D ^ A, 16); \
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C += D; \
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B = ROTL32(B ^ C, 12); \
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A += B; \
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D = ROTL32(D ^ A, 8); \
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C += D; \
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B = ROTL32(B ^ C, 7); \
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} while(0)
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int
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crypto_core_hchacha20(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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int i;
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uint32_t x0, x1, x2, x3, x4, x5, x6, x7;
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uint32_t x8, x9, x10, x11, x12, x13, x14, x15;
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if(c == NULL)
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{
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x0 = 0x61707865;
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x1 = 0x3320646e;
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x2 = 0x79622d32;
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x3 = 0x6b206574;
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}
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else
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{
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x0 = LOAD32_LE(c + 0);
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x1 = LOAD32_LE(c + 4);
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x2 = LOAD32_LE(c + 8);
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x3 = LOAD32_LE(c + 12);
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}
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x4 = LOAD32_LE(k + 0);
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x5 = LOAD32_LE(k + 4);
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x6 = LOAD32_LE(k + 8);
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x7 = LOAD32_LE(k + 12);
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x8 = LOAD32_LE(k + 16);
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x9 = LOAD32_LE(k + 20);
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x10 = LOAD32_LE(k + 24);
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x11 = LOAD32_LE(k + 28);
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x12 = LOAD32_LE(in + 0);
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x13 = LOAD32_LE(in + 4);
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x14 = LOAD32_LE(in + 8);
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x15 = LOAD32_LE(in + 12);
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for(i = 0; i < 10; i++)
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{
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QUARTERROUND(x0, x4, x8, x12);
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QUARTERROUND(x1, x5, x9, x13);
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QUARTERROUND(x2, x6, x10, x14);
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QUARTERROUND(x3, x7, x11, x15);
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QUARTERROUND(x0, x5, x10, x15);
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QUARTERROUND(x1, x6, x11, x12);
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QUARTERROUND(x2, x7, x8, x13);
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QUARTERROUND(x3, x4, x9, x14);
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}
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STORE32_LE(out + 0, x0);
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STORE32_LE(out + 4, x1);
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STORE32_LE(out + 8, x2);
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STORE32_LE(out + 12, x3);
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STORE32_LE(out + 16, x12);
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STORE32_LE(out + 20, x13);
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STORE32_LE(out + 24, x14);
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STORE32_LE(out + 28, x15);
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return 0;
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}
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size_t
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crypto_core_hchacha20_outputbytes(void)
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{
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return crypto_core_hchacha20_OUTPUTBYTES;
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}
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size_t
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crypto_core_hchacha20_inputbytes(void)
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{
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return crypto_core_hchacha20_INPUTBYTES;
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}
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size_t
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crypto_core_hchacha20_keybytes(void)
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{
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return crypto_core_hchacha20_KEYBYTES;
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}
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size_t
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crypto_core_hchacha20_constbytes(void)
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{
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return crypto_core_hchacha20_CONSTBYTES;
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}
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