Offers interface to calculate sha1 hash value of data of arbitrary size in bytes.
| SHA-1-Hashcode | Offers interface to calculate sha1 hash value of data of arbitrary size in bytes. |
| Copyright | This program is free software. |
| Files | |
| C-kern/ | Header file SHA-1-Hashcode. |
| C-kern/ | Implementation file SHA-1-Hashcode impl. |
| Types | |
| struct sha1_hash_t | Export sha1_hash_t into global namespace. |
| sha1_hashvalue_t | Defines sha1_hashvalue_t as 160 bit value. |
| Functions | |
| test | |
| unittest_math_hash_sha1 | Test sha1_hash_t. |
| sha1_hash_t | Stores the data needed to calculate SHA1 hash from binary data. |
| datalen | Stores the number of bytes process so far. |
| h | Current hash value. |
| block | Collects data until size is 64 bytes. |
| lifetime | |
| init_sha1hash | Inits internal fields to start values. |
| calculate | |
| calculate_sha1hash | Udpates internal fields with content from buffer[buffer_size]. |
| query | |
| value_sha1hash | Udpates internal fields the last time and returns hash value. |
This program is free software. You can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
© 2011 Jörg Seebohn
Header file SHA-1-Hashcode.
Implementation file SHA-1-Hashcode impl.
typedef struct sha1_hash_t sha1_hash_t
Export sha1_hash_t into global namespace.
typedef uint8_t sha1_hashvalue_t[20]
Defines sha1_hashvalue_t as 160 bit value.
int unittest_math_hash_sha1( void )
Test sha1_hash_t.
struct sha1_hash_t
Stores the data needed to calculate SHA1 hash from binary data. Call init_sha1hash and the calculate_sha1hash for your data. You can call it more than once if your data can not be processed as one single large data chunk. Use value_sha1hash to return the hash value. value_sha1hash does itself some processing before the value in h is returned.
The length in bits is added automatically to the input before value_sha1hash returns the computed hash. This makes the computed SHA-1 mores resistent to length extension attacks.
| datalen | Stores the number of bytes process so far. |
| h | Current hash value. |
| block | Collects data until size is 64 bytes. |
| lifetime | |
| init_sha1hash | Inits internal fields to start values. |
| calculate | |
| calculate_sha1hash | Udpates internal fields with content from buffer[buffer_size]. |
| query | |
| value_sha1hash | Udpates internal fields the last time and returns hash value. |
uint64_t datalen
Stores the number of bytes process so far. This value is needed to calculate the hash value in value_sha1hash.
The special value (uint64_t)-1 indicates that value_sha1hash was called and the hash value in h is valid. Calling value_sha1hash a second time only returns a pointer to h.
int calculate_sha1hash( sha1_hash_t * sha1, size_t buffer_size, const uint8_t buffer[buffer_size] )
Udpates internal fields with content from buffer[buffer_size]. You can call this function more than once if the data is not in one linear memory block. To start a new calculation either call value_sha1hash or init_sha1hash before calling this function.
sha1_hashvalue_t * value_sha1hash( sha1_hash_t * sha1 )
Udpates internal fields the last time and returns hash value. Calling this function more than once always returns the same value. The returned pointer is valid as long as you do not call any other function than value_sha1hash.
Export sha1_hash_t into global namespace.
typedef struct sha1_hash_t sha1_hash_t
Stores the data needed to calculate SHA1 hash from binary data.
struct sha1_hash_t
Defines sha1_hashvalue_t as 160 bit value.
typedef uint8_t sha1_hashvalue_t[20]
Test sha1_hash_t.
int unittest_math_hash_sha1( void )
Stores the number of bytes process so far.
uint64_t datalen
Current hash value.
uint32_t h[5]
Collects data until size is 64 bytes.
uint8_t block[64]
Inits internal fields to start values.
void init_sha1hash( /*out*/sha1_hash_t * sha1 )
Udpates internal fields with content from buffer[buffer_size].
int calculate_sha1hash( sha1_hash_t * sha1, size_t buffer_size, const uint8_t buffer[buffer_size] )
Udpates internal fields the last time and returns hash value.
sha1_hashvalue_t * value_sha1hash( sha1_hash_t * sha1 )