40 lines
854 B
C
40 lines
854 B
C
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#include "ed25519.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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int ed25519_sign(unsigned char *signature, const unsigned char *message, unsigned int message_len, const unsigned char *sign_key)
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{
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unsigned char az[64];
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unsigned char r[64];
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unsigned char hram[64];
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ge_p3 R;
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sha512_ctx hash;
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sha512(sign_key, 32, az);
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az[0] &= 248;
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az[31] &= 63;
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az[31] |= 64;
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sha512_init(&hash);
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sha512_update(&hash, az + 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, sign_key + 32, 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, az, r);
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return 0;
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}
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