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ANS X9.82 specifies several Approved derivation functions for use in distributing entropy throughout a buffer. One such derivation function is Hash_df, which can be implemented using the existing iPXE SHA-1 functionality. Signed-off-by: Michael Brown <mcb30@ipxe.org>
31 lines
683 B
C
31 lines
683 B
C
#ifndef _IPXE_HASH_DF_H
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#define _IPXE_HASH_DF_H
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/** @file
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*
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* Hash-based derivation function (Hash_df)
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdint.h>
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#include <ipxe/sha1.h>
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/** Use SHA-1 as the underlying hash algorithm
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*
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* Hash_df using SHA-1 is an Approved algorithm in ANS X9.82.
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*/
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#define hash_df_algorithm sha1_algorithm
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/** Underlying hash algorithm output length (in bytes) */
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#define HASH_DF_OUTLEN_BYTES SHA1_DIGEST_SIZE
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/** Underlying hash algorithm context size (in bytes) */
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#define HASH_DF_CTX_SIZE SHA1_CTX_SIZE
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extern void hash_df ( const void *input, size_t input_len, void *output,
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size_t output_len );
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#endif /* _IPXE_HASH_DF_H */
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