65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
#include "ed_25519.h"
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#include "lib/config.h"
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#include "sha512.h"
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#include "ge.h"
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#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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sha512_init(&hash);
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sha512_update(&hash, private_key + 32, 32);
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sha512_update(&hash, message, message_len);
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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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sha512_init(&hash);
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sha512_update(&hash, signature, 32);
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sha512_update(&hash, public_key, 32);
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sha512_update(&hash, message, message_len);
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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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void ed25519_sign_ad(FrameStruct *frame) {
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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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unsigned char *signature = &(frame->payload[36]);
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sha512_init(&hash);
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sha512_update(&hash, persistent.privkey + 32, 32);
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sha512_update(&hash, frame->payload, 32);
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sha512_update(&hash, frame->payload, 36); // pubkey and timestamp combined (32 bytes pubkey, 4 bytes timestamp)
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sha512_update(&hash, &(frame->payload[100]), frame->payloadLen - 100);
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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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sha512_init(&hash);
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sha512_update(&hash, signature, 32);
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sha512_update(&hash, frame->payload, 32);
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sha512_update(&hash, frame->payload, 36); // pubkey and timestamp combined (32 bytes pubkey, 4 bytes timestamp)
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sha512_update(&hash, &(frame->payload[100]), frame->payloadLen - 100);
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sha512_final(&hash, hram);
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sc_reduce(hram);
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sc_muladd(signature + 32, hram, persistent.privkey, r);
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}
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