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Implement SHA-512/224 and SHA-512/256 functions #47

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hauleth opened this issue Oct 28, 2015 · 0 comments · Fixed by #55
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Implement SHA-512/224 and SHA-512/256 functions #47

hauleth opened this issue Oct 28, 2015 · 0 comments · Fixed by #55
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hauleth commented Oct 28, 2015

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@silmeth silmeth self-assigned this Nov 5, 2015
@silmeth silmeth mentioned this issue Nov 6, 2015
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@homu homu closed this as completed in #55 Nov 15, 2015
homu added a commit that referenced this issue Nov 15, 2015
@homu
Auto merge of #55 - libOctavo:sha-512-224-and-256, r=hauleth
6767b05 
Add SHA-512/224 and SHA-512/256 hash functions

SHA2-512/224 and SHA-512/256 implemented, using existing macros for sha2 functions. However, SHA2-512/224 has 224 bits, and that is not a multiple of 64. Thus, `write_u64()` used for writing state to resulting `out` slice cannot be used directly (as it would copy 4 bytes to few to out, or 4 to many).

Because of that a *proxy* struct `_Sha512_224` which outputs 256 bits is created, and its methods are simply called by proper `Sha512_224` struct. In the `result()` method a new vec, `res` is created, result is written to it, and then 28 first bytes are copied to `out` using a simple for loop.

SHA2-512/256 is implemented with just `impl_sha!(high Sha512_256, SHA512_256_INIT, 256)`.

It closes #47.
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Add SHA-512/224 and SHA-512/256 hash functions libOctavo/octavo
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