Botan 2.19.1
Crypto and TLS for C&
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#include <pwdhash.h>
Public Member Functions | |
virtual void | derive_key (uint8_t out[], size_t out_len, const char *password, size_t password_len, const uint8_t salt[], size_t salt_len) const =0 |
virtual size_t | iterations () const =0 |
virtual size_t | memory_param () const |
virtual size_t | parallelism () const |
virtual std::string | to_string () const =0 |
virtual size_t | total_memory_usage () const |
virtual | ~PasswordHash ()=default |
Base class for password based key derivation functions.
Converts a password into a key using a salt and iterated hashing to make brute force attacks harder.
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virtualdefault |
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pure virtual |
Derive a key from a password
out | buffer to store the derived key, must be of out_len bytes |
out_len | the desired length of the key to produce |
password | the password to derive the key from |
password_len | the length of password in bytes |
salt | a randomly chosen salt |
salt_len | length of salt in bytes |
This function is const, but is not thread safe. Different threads should either use unique objects, or serialize all access.
Implemented in Botan::Argon2, Botan::Bcrypt_PBKDF, Botan::PBKDF2, Botan::RFC4880_S2K, and Botan::Scrypt.
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pure virtual |
Most password hashes have some notion of iterations.
Implemented in Botan::Argon2, Botan::Bcrypt_PBKDF, Botan::PBKDF2, Botan::RFC4880_S2K, and Botan::Scrypt.
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inlinevirtual |
Some password hashing algorithms have a parameter which controls how much memory is used. If not supported by some algorithm, returns 0.
Reimplemented in Botan::Argon2, Botan::Bcrypt_PBKDF, and Botan::Scrypt.
Definition at line 40 of file pwdhash.h.
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inlinevirtual |
Some password hashing algorithms have a parallelism parameter. If the algorithm does not support this notion, then the function returns zero. This allows distinguishing between a password hash which just does not support parallel operation, vs one that does support parallel operation but which has been configured to use a single lane.
Reimplemented in Botan::Argon2, Botan::Bcrypt_PBKDF, and Botan::Scrypt.
Definition at line 50 of file pwdhash.h.
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pure virtual |
Implemented in Botan::Argon2, Botan::Bcrypt_PBKDF, Botan::PBKDF2, Botan::RFC4880_S2K, and Botan::Scrypt.
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inlinevirtual |
Returns an estimate of the total memory usage required to perform this key derivation.
If this algorithm uses a small and constant amount of memory, with no effort made towards being memory hard, this function returns 0.
Reimplemented in Botan::Argon2, Botan::Bcrypt_PBKDF, and Botan::Scrypt.
Definition at line 59 of file pwdhash.h.