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      1 
      2 #define TEST_NAME "ed25519_convert"
      3 #include "cmptest.h"
      4 
      5 static const unsigned char keypair_seed[crypto_sign_ed25519_SEEDBYTES] = {
      6     0x42, 0x11, 0x51, 0xa4, 0x59, 0xfa, 0xea, 0xde, 0x3d, 0x24, 0x71,
      7     0x15, 0xf9, 0x4a, 0xed, 0xae, 0x42, 0x31, 0x81, 0x24, 0x09, 0x5a,
      8     0xfa, 0xbe, 0x4d, 0x14, 0x51, 0xa5, 0x59, 0xfa, 0xed, 0xee
      9 };
     10 
     11 int
     12 main(void)
     13 {
     14     unsigned char ed25519_pk[crypto_sign_ed25519_PUBLICKEYBYTES];
     15     unsigned char ed25519_skpk[crypto_sign_ed25519_SECRETKEYBYTES];
     16     unsigned char curve25519_pk[crypto_scalarmult_curve25519_BYTES];
     17     unsigned char curve25519_pk2[crypto_scalarmult_curve25519_BYTES];
     18     unsigned char curve25519_sk[crypto_scalarmult_curve25519_BYTES];
     19     char          curve25519_pk_hex[crypto_scalarmult_curve25519_BYTES * 2 + 1];
     20     char          curve25519_sk_hex[crypto_scalarmult_curve25519_BYTES * 2 + 1];
     21     unsigned char hseed[crypto_hash_sha512_BYTES];
     22     unsigned int  i;
     23 
     24     assert(crypto_sign_ed25519_SEEDBYTES <= crypto_hash_sha512_BYTES);
     25 #ifdef ED25519_NONDETERMINISTIC
     26     crypto_hash_sha512(hseed, keypair_seed, crypto_sign_ed25519_SEEDBYTES);
     27 #else
     28     memcpy(hseed, keypair_seed, crypto_sign_ed25519_SEEDBYTES);
     29 #endif
     30     crypto_sign_ed25519_seed_keypair(ed25519_pk, ed25519_skpk, hseed);
     31 
     32     if (crypto_sign_ed25519_pk_to_curve25519(curve25519_pk, ed25519_pk) != 0) {
     33         printf("conversion failed\n");
     34     }
     35     crypto_sign_ed25519_sk_to_curve25519(curve25519_sk, ed25519_skpk);
     36     sodium_bin2hex(curve25519_pk_hex, sizeof curve25519_pk_hex, curve25519_pk,
     37                    sizeof curve25519_pk);
     38     sodium_bin2hex(curve25519_sk_hex, sizeof curve25519_sk_hex, curve25519_sk,
     39                    sizeof curve25519_sk);
     40 
     41     printf("curve25519 pk: [%s]\n", curve25519_pk_hex);
     42     printf("curve25519 sk: [%s]\n", curve25519_sk_hex);
     43 
     44     for (i = 0U; i < 500U; i++) {
     45         crypto_sign_ed25519_keypair(ed25519_pk, ed25519_skpk);
     46         if (crypto_sign_ed25519_pk_to_curve25519(curve25519_pk, ed25519_pk) !=
     47             0) {
     48             printf("conversion failed\n");
     49         }
     50         crypto_sign_ed25519_sk_to_curve25519(curve25519_sk, ed25519_skpk);
     51         crypto_scalarmult_curve25519_base(curve25519_pk2, curve25519_sk);
     52         if (memcmp(curve25519_pk, curve25519_pk2, sizeof curve25519_pk) != 0) {
     53             printf("conversion failed\n");
     54         }
     55     }
     56 
     57     sodium_hex2bin(ed25519_pk, crypto_sign_ed25519_PUBLICKEYBYTES,
     58                    "0000000000000000000000000000000000000000000000000000000000000000"
     59                    "0000000000000000000000000000000000000000000000000000000000000000",
     60                    64, NULL, NULL, NULL);
     61     assert(crypto_sign_ed25519_pk_to_curve25519(curve25519_pk, ed25519_pk) == -1);
     62     sodium_hex2bin(ed25519_pk, crypto_sign_ed25519_PUBLICKEYBYTES,
     63                    "0200000000000000000000000000000000000000000000000000000000000000"
     64                    "0000000000000000000000000000000000000000000000000000000000000000",
     65                    64, NULL, NULL, NULL);
     66     assert(crypto_sign_ed25519_pk_to_curve25519(curve25519_pk, ed25519_pk) == -1);
     67     sodium_hex2bin(ed25519_pk, crypto_sign_ed25519_PUBLICKEYBYTES,
     68                    "0500000000000000000000000000000000000000000000000000000000000000"
     69                    "0000000000000000000000000000000000000000000000000000000000000000",
     70                    64, NULL, NULL, NULL);
     71     assert(crypto_sign_ed25519_pk_to_curve25519(curve25519_pk, ed25519_pk) == -1);
     72 
     73     printf("ok\n");
     74 
     75     return 0;
     76 }
     77