object

hash_common_32

Auxiliary predicates for the hashes library 32-bit algorithms.

Availability:
logtalk_load(hashes(loader))
Author: Paulo Moura
Version: 1:4:0
Date: 2026-08-04
Compilation flags:
static, context_switching_calls
Uses:
byte_order
list
Remarks:
(none)
Inherited public predicates:
(none)

Public predicates

word32_hex/2

Converts a 32-bit word into an 8-digit lowercase hexadecimal atom.

Compilation flags:
static
Template:
word32_hex(Word,Hex)
Mode and number of proofs:
word32_hex(+integer,-atom) - one

bytes_hex/2

Converts a list of bytes into a lowercase hexadecimal atom.

Compilation flags:
static
Template:
bytes_hex(Bytes,Hex)
Mode and number of proofs:
bytes_hex(+list(integer),-atom) - one

mask32/1

Returns the 32-bit mask value.

Compilation flags:
static
Template:
mask32(Mask)
Mode and number of proofs:
mask32(-integer) - one

add32/3

Adds two integers modulo 2^32.

Compilation flags:
static
Template:
add32(A,B,Sum)
Mode and number of proofs:
add32(+integer,+integer,-integer) - one

add32/4

Adds three integers modulo 2^32.

Compilation flags:
static
Template:
add32(A,B,C,Sum)
Mode and number of proofs:
add32(+integer,+integer,+integer,-integer) - one

add32/5

Adds four integers modulo 2^32.

Compilation flags:
static
Template:
add32(A,B,C,D,Sum)
Mode and number of proofs:
add32(+integer,+integer,+integer,+integer,-integer) - one

mul32/3

Multiplies two integers modulo 2^32. Computed via 16-bit limb decomposition so that no intermediate result exceeds about 2**49, avoiding integer overflow errors on backends with bounded integer arithmetic.

Compilation flags:
static
Template:
mul32(A,B,Product)
Mode and number of proofs:
mul32(+integer,+integer,-integer) - one

rol32/3

Rotates a 32-bit word left by the given number of bits.

Compilation flags:
static
Template:
rol32(Value,Shift,Rotated)
Mode and number of proofs:
rol32(+integer,+integer,-integer) - one

ror32/3

Rotates a 32-bit word right by the given number of bits.

Compilation flags:
static
Template:
ror32(Value,Shift,Rotated)
Mode and number of proofs:
ror32(+integer,+integer,-integer) - one

pad_md/4

Pads a message using MD-style padding with a little-endian or big-endian length field.

Compilation flags:
static
Template:
pad_md(Endian,Bytes,LengthFieldBytes,PaddedBytes)
Mode and number of proofs:
pad_md(+little_big,+list(integer),+integer,-list(integer)) - one

pad_md_tail/5

Pads the final, less-than-one-block tail of a message using MD-style padding given the total message length in bytes. For use when the message has already been consumed block by block during segmented/incremental hashing, so that only the unconsumed tail, and not the whole message, needs to be available.

Compilation flags:
static
Template:
pad_md_tail(Endian,TailBytes,TotalLength,LengthFieldBytes,PaddedBytes)
Mode and number of proofs:
pad_md_tail(+little_big,+list(integer),+integer,+integer,-list(integer)) - one

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)