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98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
#ifndef BCRYPT_H_
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#define BCRYPT_H_
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/*
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* bcrypt wrapper library
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*
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* Written in 2011, 2013, 2014, 2015 by Ricardo Garcia <r@rg3.name>
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*
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* To the extent possible under law, the author(s) have dedicated all copyright
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* and related and neighboring rights to this software to the public domain
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* worldwide. This software is distributed without any warranty.
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*
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* You should have received a copy of the CC0 Public Domain Dedication along
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* with this software. If not, see
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* <http://creativecommons.org/publicdomain/zero/1.0/>.
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*/
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#define BCRYPT_HASHSIZE (64)
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* This function expects a work factor between 4 and 31 and a char array to
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* store the resulting generated salt. The char array should typically have
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* BCRYPT_HASHSIZE bytes at least. If the provided work factor is not in the
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* previous range, it will default to 12.
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*
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* The return value is zero if the salt could be correctly generated and
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* nonzero otherwise.
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*
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*/
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int bcrypt_gensalt(int workfactor, char salt[BCRYPT_HASHSIZE]);
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/*
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* This function expects a password to be hashed, a salt to hash the password
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* with and a char array to leave the result. Both the salt and the hash
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* parameters should have room for BCRYPT_HASHSIZE characters at least.
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*
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* It can also be used to verify a hashed password. In that case, provide the
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* expected hash in the salt parameter and verify the output hash is the same
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* as the input hash. However, to avoid timing attacks, it's better to use
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* bcrypt_checkpw when verifying a password.
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*
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* The return value is zero if the password could be hashed and nonzero
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* otherwise.
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*/
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int bcrypt_hashpw(const char *passwd, const char salt[BCRYPT_HASHSIZE],
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char hash[BCRYPT_HASHSIZE]);
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/*
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* This function expects a password and a hash to verify the password against.
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* The internal implementation is tuned to avoid timing attacks.
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*
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* The return value will be -1 in case of errors, zero if the provided password
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* matches the given hash and greater than zero if no errors are found and the
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* passwords don't match.
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*
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*/
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int bcrypt_checkpw(const char *passwd, const char hash[BCRYPT_HASHSIZE]);
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/*
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* Brief Example
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* -------------
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*
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* Hashing a password:
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*
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* char salt[BCRYPT_HASHSIZE];
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* char hash[BCRYPT_HASHSIZE];
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* int ret;
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*
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* ret = bcrypt_gensalt(12, salt);
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* assert(ret == 0);
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* ret = bcrypt_hashpw("thepassword", salt, hash);
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* assert(ret == 0);
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*
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*
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* Verifying a password:
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*
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* int ret;
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*
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* ret = bcrypt_checkpw("thepassword", "expectedhash");
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* assert(ret != -1);
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*
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* if (ret == 0) {
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* printf("The password matches\n");
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* } else {
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* printf("The password does NOT match\n");
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* }
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*
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif
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