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* chksum.c (sha256_ctx_s, md5_ctx_s): New symbol variables.
(sha256_ops, md5_ops): New static structs.
(sha256_begin, sha256_hash, sha256_end, md5_begin, md5_hash,
md5_end): New functions.
(chksum_init): New symbol variables initialized; sha256-begin,
sha256-hash, sha256-end, md5-begin, md5-hash, md5-end
intrinsics registered.
* chksum.h (sha256_begin, sha256_hash, sha256_end, md5_begin,
md5_hash, md5_end): Declared.
* txr.1: Documented.
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* Makefile (OBJS): New object file, chksums/md5.o.
* chksum.c (sha256_ensure_buf): Renamed to chksum_ensure_buf
and made generic so MD5 code can borrow it.
(sha256_stream, sha256): Call chksum_ensure_buf instead of
sha256_ensure_buf, passing in new length and hash name
parameters.
(md5_stream_impl, md5_buf, md5_str): New static functions.
(md5_stream, md5): New functions.
(chksum_init): Register md5-stream and md5 intrinsics.
* chksum.h (md5_stream, md5): Declared.
* chksums/md5.c, chksums/md5.h: New files.
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* chksum.c (sha256_stream_impl): New static function, formed
out of bulk of sha256_stream. Takes a pointer to a buffer
where the digest is stored.
(sha256_ensure_buf): New static function.
(sha256_stream): Take buf argument; use sha256_ensure_buf to
allocate a buffer if necessary, and to obtain the low-level
buffer pointer. Implementation moved into sha256_stream_impl.
(sha256_buf, sha256_str): Take pointer to digest buffer; don't
allocate a buf object, don't return anything.
(sha256): Take buf argument; use sha256_ensure_buf to
allocate a buffer if necessary, and to obtain the low-level
buffer pointer, which is passed to sha256_buf and sha256_str.
(chksum_init): Update registrations of intrinsics with new
optional parameters.
* chksum.h (sha256_stream, sha256): Declarations updated.
* txr.1: Updated.
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* chksum.c, chksum.h, chksums/sha256.c, chksums/sha256.h: New files.
* lib.c (init): Call chksum_init.
* txr.1: Documented.
* LICENSE: Add SHA-256 copyright notice.
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