71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/*
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* GraxRabble
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* Demo programs for libsodium.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sodium.h> /* library header */
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#include "demo_utils.h" /* utility functions shared by demos */
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/*
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* Full featured authentication which is used to verify that the message
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* comes from the expected person. It should be safe to keep the same key
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* for multiple messages.
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*/
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static int
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auth(void)
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{
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unsigned char k[crypto_auth_KEYBYTES]; /* key */
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unsigned char a[crypto_auth_BYTES]; /* authentication token */
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unsigned char m[MAX_INPUT_SIZE]; /* message */
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size_t mlen; /* message length */
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int r;
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puts("Example: crypto_auth\n");
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/*
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* Keys are entered as ascii values. The key is zeroed to
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* maintain consistency. Input is read through a special
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* function which reads exactly n bytes into a buffer to
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* prevent buffer overflows.
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*/
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sodium_memzero(k, sizeof k);
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prompt_input("Input your key > ", (char*)k, sizeof k);
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puts("Your key that you entered");
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print_hex(k, sizeof k);
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putchar('\n');
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mlen = prompt_input("Input your message > ", (char*)m, sizeof m);
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putchar('\n');
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printf("Generating %s authentication...\n", crypto_auth_primitive());
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crypto_auth(a, m, mlen, k);
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puts("Format: authentication token::message");
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print_hex(a, sizeof a);
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fputs("::", stdout);
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puts((const char*)m);
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putchar('\n');
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puts("Verifying authentication...");
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r = crypto_auth_verify(a, m, mlen, k);
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print_verification(r);
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sodium_memzero(k, sizeof k); /* wipe sensitive data */
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sodium_memzero(a, sizeof a);
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sodium_memzero(m, sizeof m);
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return r;
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}
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int
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main(void)
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{
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sodium_init();
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printf("Using LibSodium %s\n", sodium_version_string());
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return auth() != 0;
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}
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