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   #undef SHA512_SHORT_BLOCK_LENGTH
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   #undef SHA512_SHORT_BLOCK_LENGTH
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   return;
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   return;
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}
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}
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uint8_t *SHA512 (void *data, size_t data_len, uint8_t *digest_or_NULL)
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const char *SHA512 (void *data, size_t data_len, uint8_t *digest_or_NULL)
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{
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{
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   // computes the SHA-512 hash of a block of data in one pass and write it to digest, or to a static buffer if NULL
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   // computes the SHA-512 hash of a block of data in one pass and write it to digest, or to a static buffer if NULL
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   // returns the STRING REPRESENTATION of digest in a statically-allocated string
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   // returns the STRING REPRESENTATION of digest in a statically-allocated string
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   static thread_local uint8_t static_digest[SHA512_DIGEST_LENGTH] = "";
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   static thread_local uint8_t static_digest[SHA512_DIGEST_LENGTH] = "";