39 lines
764 B
C
39 lines
764 B
C
#include "crypto_sign.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 crypto_sign(
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unsigned char *sm,unsigned long long *smlen,
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const unsigned char *m,unsigned long long mlen,
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const unsigned char *sk
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)
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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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unsigned long long i;
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sha512(az,sk,32);
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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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*smlen = mlen + 64;
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for (i = 0;i < mlen;++i) sm[64 + i] = m[i];
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for (i = 0;i < 32;++i) sm[32 + i] = az[32 + i];
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sha512(r,sm + 32,mlen + 32);
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for (i = 0;i < 32;++i) sm[32 + i] = sk[32 + i];
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sc_reduce(r);
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ge_scalarmult_base(&R,r);
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ge_p3_tobytes(sm,&R);
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sha512(hram,sm,mlen + 64);
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sc_reduce(hram);
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sc_muladd(sm + 32,hram,az,r);
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return 0;
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}
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