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37 #include <openssl/rand.h>
40 #include <tr_rand_id.h>
42 static char *bytes_to_hex(TALLOC_CTX *mem_ctx, const unsigned char *bytes, size_t len)
44 char *hex = talloc_size(mem_ctx, 1 + len * 2 * sizeof(char));
50 p += sprintf(p, "%02x", *(bytes++));
58 * Generate n random bytes of data
60 * @param dst destination buffer, at least n bytes long
61 * @param n number of bytes to generate
64 static int random_bytes(unsigned char *dst, size_t n)
66 return RAND_pseudo_bytes(dst, n);
71 * Generate a random ID
73 * @param mem_ctx talloc context for the result
74 * @return random string of hex characters or null if it is unable to generate them
76 char *tr_random_id(TALLOC_CTX *mem_ctx)
78 unsigned char bytes[ID_LENGTH];
81 if (random_bytes(bytes, ID_LENGTH) >= 0)
82 hex = bytes_to_hex(mem_ctx, bytes, ID_LENGTH);