72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
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/*
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* GraxRabble
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* 05 May 2014
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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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* This method is only effective for a single use per key. The benefit is
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* the algorithm is quicker and output is half the size of auth. It is easy
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* to see how weak the algorithm is when you use a one letter key.
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*
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* Note that the same key must not be used more than once.
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*/
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static int
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onetimeauth(void)
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{
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unsigned char k[crypto_onetimeauth_KEYBYTES];/* key */
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unsigned char a[crypto_onetimeauth_BYTES]; /* authentication */
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unsigned char m[BUFFER_SIZE]; /* message */
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size_t mlen; /* message length */
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int r;
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sodium_memzero(k, sizeof k); /* must zero the key */
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puts("Example: crypto_onetimeauth\n");
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prompt_input("Input your key > ", (char*) k, sizeof k);
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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",
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crypto_onetimeauth_primitive());
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crypto_onetimeauth(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_onetimeauth_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(int argc, char **argv)
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{
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int r;
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sodium_init();
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printf("Using LibSodium %s\n", sodium_version_string());
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r = (0 == onetimeauth() ? EXIT_SUCCESS : EXIT_FAILURE);
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exit(r);
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}
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