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| author | Andy Polyakov <appro@openssl.org> | 2017-04-03 23:41:19 +0200 |
|---|---|---|
| committer | Andy Polyakov <appro@openssl.org> | 2017-04-04 23:16:03 +0200 |
| commit | 1bc563caa144a568fc505f210568f5ac5b66315e (patch) | |
| tree | 8be3916e7d01656df5153ddb98b9eaf23e392135 /Configurations | |
| parent | b7438b430bf0787165ad36105913b342c3974607 (diff) | |
| download | openssl-1bc563caa144a568fc505f210568f5ac5b66315e.tar.gz | |
Configurations/README: reword bn_ops description.
Fixes GH#3116.
Reviewed-by: Richard Levitte <levitte@openssl.org>
Diffstat (limited to 'Configurations')
| -rw-r--r-- | Configurations/README | 52 |
1 files changed, 28 insertions, 24 deletions
diff --git a/Configurations/README b/Configurations/README index 2958461393..92ff1ace7f 100644 --- a/Configurations/README +++ b/Configurations/README @@ -136,34 +136,38 @@ In each table entry, the following keys are significant: to have the different variants in different directories. - bn_ops => Building options (was just bignum options - in the earlier history of this option, - hence the name). This a string of words - that describe properties on the designated - target platform, such as the type of - integers used to build up the bitnum, - different ways to implement certain ciphers - and so on. To fully comprehend the + bn_ops => Building options (was just bignum options in + the earlier history of this option, hence the + name). This is a string of words that describe + algorithms' implementation parameters that + are optimal for the designated target platform, + such as the type of integers used to build up + the bignum, different ways to implement certain + ciphers and so on. To fully comprehend the meaning, the best is to read the affected source. The valid words are: - BN_LLONG use 'unsigned long long' in - some bignum calculations. - This has no value when - SIXTY_FOUR_BIT or - SIXTY_FOUR_BIT_LONG is given. - RC4_CHAR makes the basic RC4 unit of - calculation an unsigned char. - SIXTY_FOUR_BIT processor registers - are 64 bits, long is - 32 bits, long long is - 64 bits. - SIXTY_FOUR_BIT_LONG processor registers - are 64 bits, long is - 64 bits. - THIRTY_TWO_BIT processor registers - are 32 bits. + THIRTY_TWO_BIT bignum limbs are 32 bits, + this is default if no + option is specified, it + works on any supported + system [unless "wider" + limb size is implied in + assembly code]; + BN_LLONG bignum limbs are 32 bits, + but 64-bit 'unsigned long + long' is used internally + in calculations; + SIXTY_FOUR_BIT_LONG bignum limbs are 64 bits + and sizeof(long) is 8; + SIXTY_FOUR_BIT bignums limbs are 64 bits, + but execution environment + is ILP32; + RC4_CHAR RC4 key schedule is made + up of 'unsigned char's; + RC4_INT RC4 key schedule is made + up of 'unsigned int's; EXPORT_VAR_AS_FN for shared libraries, export vars as accessor functions. |