61 lines
1.5 KiB
C
61 lines
1.5 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 "utils.h" /* utility functions shared by demos */
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/*
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* Streaming variant of generic hash. This has the ability to hash
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* data in chunks at a time and compute the same result as hashing
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* all of the data at once.
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*/
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void
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generichashstream(void)
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{
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unsigned char k[crypto_generichash_KEYBYTES_MAX]; /* key */
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unsigned char h[crypto_generichash_BYTES_MIN]; /* hash output */
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crypto_generichash_state state; /* hash stream */
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unsigned char m[MAX_INPUT_SIZE]; /* input buffer */
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size_t mlen; /* input length */
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puts("Example: crypto_generichashstream\n");
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prompt_input("a key", (char*)k, sizeof k, 0);
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putchar('\n');
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printf("Hashing message with %s\n", crypto_generichash_primitive());
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/* initialize the stream */
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crypto_generichash_init(&state, k, sizeof k, sizeof h);
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for(;;) {
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mlen = prompt_input("the next part of the message", (char*)m, sizeof m);
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if (mlen == 0)
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break;
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/* keep appending data */
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crypto_generichash_update(&state, m, mlen);
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}
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crypto_generichash_final(&state, h, sizeof h);
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putchar('\n');
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fputs("Hash: ", stdout);
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print_hex(h, sizeof h);
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putchar('\n');
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}
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int
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main(void)
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{
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init();
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generichashstream();
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return 0;
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}
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