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@@ -71,4 +71,26 @@ enum {
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int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
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int argc, char * const argv[]);
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+/**
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+ * hash_block() - Hash a block according to the requested algorithm
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+ *
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+ * The caller probably knows the hash length for the chosen algorithm, but
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+ * in order to provide a general interface, and output_size parameter is
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+ * provided.
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+ *
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+ * @algo_name: Hash algorithm to use
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+ * @data: Data to hash
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+ * @len: Lengh of data to hash in bytes
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+ * @output: Place to put hash value
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+ * @output_size: On entry, pointer to the number of bytes available in
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+ * output. On exit, pointer to the number of bytes used.
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+ * If NULL, then it is assumed that the caller has
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+ * allocated enough space for the hash. This is possible
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+ * since the caller is selecting the algorithm.
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+ * @return 0 if ok, -ve on error: -EPROTONOSUPPORT for an unknown algorithm,
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+ * -ENOSPC if the output buffer is not large enough.
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+ */
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+int hash_block(const char *algo_name, const void *data, unsigned int len,
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+ uint8_t *output, int *output_size);
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+
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#endif
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