-rw-r--r-- 623 lib25519-20240928/crypto_mGnP/ed25519/ref10/mGnP.c raw
#include <string.h> #include "ge.h" #include "sc.h" #include "crypto_verify_32.h" #include "crypto_mGnP.h" void crypto_mGnP( unsigned char *Q, const unsigned char *m, const unsigned char *n, const unsigned char *P ) { unsigned char mcopy[64]; unsigned char ncopy[64]; ge_p3 P_internal; ge_p2 R; int ok; ok = ge_frombytes_negate_vartime(&P_internal,P); memcpy(mcopy,m,32); memset(mcopy+32,0,32); sc_reduce(mcopy); if (crypto_verify_32(mcopy,m)) ok = 0; memcpy(ncopy,n,64); sc_reduce(ncopy); ge_double_scalarmult_vartime(&R,ncopy,&P_internal,mcopy); ge_tobytes(Q,&R); Q[32] = ok; }