33 lines
1.1 KiB
C
33 lines
1.1 KiB
C
#include "../include/ed25519.h"
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#include "../include/sha512.h"
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#include "../include/ge.h"
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#include "../include/sc.h"
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void ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *public_key, const unsigned char *private_key) {
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sha512_context hash;
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unsigned char hram[64];
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unsigned char r[64];
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ge_p3 R;
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_ed_sha512_validate();
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_ed_sha512_functions._ed_sha512_init(&hash);
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_ed_sha512_functions._ed_sha512_update(&hash, private_key + 32, 32);
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_ed_sha512_functions._ed_sha512_update(&hash, message, message_len);
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_ed_sha512_functions._ed_sha512_final(&hash, r);
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sc_reduce(r);
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ge_scalarmult_base(&R, r);
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ge_p3_tobytes(signature, &R);
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_ed_sha512_functions._ed_sha512_init(&hash);
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_ed_sha512_functions._ed_sha512_update(&hash, signature, 32);
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_ed_sha512_functions._ed_sha512_update(&hash, public_key, 32);
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_ed_sha512_functions._ed_sha512_update(&hash, message, message_len);
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_ed_sha512_functions._ed_sha512_final(&hash, hram);
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sc_reduce(hram);
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sc_muladd(signature + 32, hram, private_key, r);
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}
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