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int MD5_init(void **shaState);
int MD5_destroy(void *shaState);
int MD5_update(void *hs,
const uint8_t *buf,
size_t len);
int MD5_digest(const void *shaState,
uint8_t digest[MD5_DIGEST_SIZE]);
int MD5_copy(const void *src, void *dst);
int MD5_pbkdf2_hmac_assist(const void *inner,
const void *outer,
const uint8_t first_digest[MD5_DIGEST_SIZE],
uint8_t final_digest[MD5_DIGEST_SIZE],
size_t iterations);
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input to the compression function
:vartype block_size: integer
:ivar digest_size: the size in bytes of the resulting hash
:vartype digest_size: integer
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