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101 lines
2.5 KiB
Plaintext
101 lines
2.5 KiB
Plaintext
NAME
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sha - old Secure Hash Algorithm (SHS FIPS Pub 180)
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SYNOPSIS
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sha([arg1 [, val ...]])
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TYPES
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arg1 any
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val any
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return HASH or number
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DESCRIPTION
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The sha() builtin implements the old Secure Hash Algorithm
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(SHA). The SHA is sometimes referenced as SHS. The SHA
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is a 160 bit hash.
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With no args, sha() returns the default initial SHA-1 HASH state.
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If arg1 is a HASH state and no other val args are given, then the
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HASH state is finalized and the numeric value of the hash is given.
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If arg1 is a HASH state and one or more val args are given,
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then the val args are used to modify the arg1 HASH state.
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The new arg1 HASH state is returned.
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If arg1 is not a a HASH state, then the initial HASH is
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used and modifed by arg1 and any val args supplied. The
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return value is the new HASH state.
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The following table gives a summary of actions and return values.
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Here, assume that 'h' is a HASH state:
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sha() HASH returns initial HASH state
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sha(h) number h is put into final form and the
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numeric value of the hash state
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sha(x) HASH modify the initial state by hashing 'x'
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sha(sha(), x) HASH the same as sha(x)
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sha(x, y) HASH the same as sha(sha(x), y)
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sha(h, x, y) HASH modify state 'h' by 'x' and then 'y'
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sha(sha(h,x,y)) number numeric value of the above call
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EXAMPLE
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> base(16)
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0xa
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> sha()
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sha hash state
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> sha(sha())
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0xf96cea198ad1dd5617ac084a3d92c6107708c0ef
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> sha("x", "y", "z") == sha("xyz")
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1
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> sha("x", "y", "z") == sha("xy")
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0
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> sha(sha("this is", 7^19-8, "a composit", 3i+4.5, "hash"))
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0x21e42319a26787046c2b28b7ae70f1b54bf0ba2a
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> x = sha(list(1,2,3), "curds and whey", 2^21701-1, pi())
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> x
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sha hash state
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> sha(x)
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0xc9e155522ea4a38d85340e6f1c2e36636950ea7e
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> y = sha()
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> y = sha(y, list(1,2,3), "curds and whey")
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> y = sha(y, 2^21701-1)
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> y = sha(y, pi())
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> y
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sha hash state
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> sha(y)
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0xc9e155522ea4a38d85340e6f1c2e36636950ea7e
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LIMITS
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none
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LIBRARY
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HASH* hash_init(int, HASH*);
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void hash_free(HASH*);
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HASH* hash_copy(HASH*);
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int hash_cmp(HASH*, HASH*);
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void hash_print(HASH*);
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ZVALUE hash_final(HASH*);
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HASH* hash_long(int, long, HASH*);
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HASH* hash_zvalue(int, ZVALUE, HASH*);
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HASH* hash_number(int, void*, HASH*);
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HASH* hash_complex(int, void*, HASH*);
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HASH* hash_str(int, char*, HASH*);
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HASH* hash_usb8(int, USB8*, int, HASH*);
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HASH* hash_value(int, void*, HASH*);
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SEE ALSO
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ishash, sha1
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