59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* GraxRabble
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* example programs for libsodium.
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*/
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#include <sodium.h> /* library header */
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#include "utils.h" /* utility functions shared by examples */
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/*
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* Many applications and programming language implementations were
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* recently found to be vulnerable to denial-of-service attacks when
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* a hash function with weak security guarantees, such as Murmurhash
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* 3, was used to construct a hash table.
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*
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* In order to address this, Sodium provides the crypto_shorthash()
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* function, which outputs short but unpredictable (without knowing
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* the secret key) values suitable for picking a list in a hash table
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* for a given key.
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*
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* This function is optimized for short inputs.
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*
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* The output of this function is only 64 bits. Therefore, it should
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* not be considered collision-resistant.
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*
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* Use cases:
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*
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* - Hash tables
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* - Probabilistic data structures such as Bloom filters
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* - Integrity checking in interactive protocols
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*/
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void
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shorthash(void)
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{
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unsigned char key[crypto_shorthash_KEYBYTES];
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unsigned char hash[crypto_shorthash_BYTES];
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unsigned char message[MAX_INPUT_LEN];
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size_t message_len;
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puts("Example: crypto_shorthash\n");
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prompt_input("a key", (char*)key, sizeof key, 0);
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message_len = prompt_input("a message", (char*)message, sizeof message, 1);
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printf("Hashing the message with %s\n", crypto_shorthash_primitive());
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crypto_shorthash(hash, message, message_len, key);
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printf("Hash: ");
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print_hex(hash, sizeof hash);
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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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shorthash();
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return 0;
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}
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