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libsodium/test/default/auth5.c

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#define TEST_NAME "auth5"
#include "cmptest.h"
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static unsigned char key[32];
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static unsigned char c[1000];
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static unsigned char a[32];
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int
main(void)
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{
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size_t clen;
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for (clen = 0; clen < 1000; ++clen) {
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crypto_auth_keygen(key);
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randombytes_buf(c, clen);
crypto_auth(a, c, clen, key);
if (crypto_auth_verify(a, c, clen, key) != 0) {
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printf("fail %u\n", (unsigned int) clen);
return 100;
}
if (clen > 0) {
c[rand() % clen] += 1 + (rand() % 255);
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if (crypto_auth_verify(a, c, clen, key) == 0) {
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printf("forgery %u\n", (unsigned int) clen);
return 100;
}
a[rand() % sizeof a] += 1 + (rand() % 255);
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if (crypto_auth_verify(a, c, clen, key) == 0) {
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printf("forgery %u\n", (unsigned int) clen);
return 100;
}
}
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}
return 0;
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}