Esch

Esch Algorithms More...

Typedefs
typedef hasher< detail::esch_provider< 512, false > >	digestpp::esch
	Esch hash function.
typedef hasher< detail::esch_provider< 384, true > >	digestpp::esch256_xof
	XOEsch256 (Esch-256 in XOF mode)
typedef hasher< detail::esch_provider< 512, true > >	digestpp::esch384_xof
	XOEsch384 (Esch-384 in XOF mode)
template<size_t N>
using	digestpp::static_size::esch = hasher<detail::esch_provider<512, false, N>>
	Esch hash function (static-size version)

Detailed Description

Esch Algorithms

Typedef Documentation

esch [1/2]

typedef hasher<detail::esch_provider<512, false> > digestpp::esch

Esch hash function.

Hash function based on the Sparkle permutation family. A finalist in the NIST Lightweight Cryptography competition.

Designed by Christof Beierle, Alex Biryukov, Luan Cardoso dos Santos, Johann Großschädl, Léo Perrin, Aleksei Udovenko, Vesselin Velichkov, and Qingju Wang.

Esch uses the ARX (Addition-Rotation-XOR) design philosophy and is optimized for software implementations on resource-constrained devices. The algorithm provides good performance on both 8-bit microcontrollers and 32-bit/64-bit platforms.

Type:

Cryptographic hash function.

Output size:

256 / 384 bits

Default size:

none (must be specified)

Exceptions

std::runtime_error

if the requested digest size is not supported

Example:

 // Output a 256-bit Esch digest of a string
digestpp::esch hasher(256);
hasher.absorb("The quick brown fox jumps over the lazy dog");
std::cout << hasher.hexdigest() << '\n';

Example output:

d43f87a0fe60fc5925064880c6116c136b6d94fa24a93dffcb35d178c3af932c

See also

hasher, esch256_xof, digestpp::static_size::esch

esch [2/2]

template<size_t N>

using digestpp::static_size::esch = hasher<detail::esch_provider<512, false, N>>

Esch hash function (static-size version)

Variant of Esch with output size specified as template parameter.

Type:

Cryptographic hash function.

Output size:

256 / 384 bits

Template Parameters

N	Digest size in bits (256 or 384).

Example:

 // Output a 256-bit Esch digest of a string
digestpp::static_size::esch<256> hasher;
hasher.absorb("The quick brown fox jumps over the lazy dog");
std::cout << hasher.hexdigest() << '\n';

Example output:

d43f87a0fe60fc5925064880c6116c136b6d94fa24a93dffcb35d178c3af932c

See also

hasher, digestpp::esch

esch256_xof

typedef hasher<detail::esch_provider<384, true> > digestpp::esch256_xof

XOEsch256 (Esch-256 in XOF mode)

Extendable output function based on Esch-256/Sparkle384.

XOEsch allows squeezing arbitrary amounts of data, making it suitable for key derivation and other applications in lightweight cryptography.

Lightweight alternative to SHAKE for constrained environments based on Sparkle384 permutation.

Type:

Extendable output function (XOF).

Example:

 // Absorb a string and squeeze 32 bytes of output
digestpp::esch_xof hasher;
hasher.absorb("The quick brown fox jumps over the lazy dog");
std::cout << hasher.hexsqueeze(32) << '\n';

Example output:

8f2e2748fb97b99ad18aed8f9f72cad036fb00b1a21147bb0273551d07bf9d80

See also

hasher, esch, esch384_xof

esch384_xof

typedef hasher<detail::esch_provider<512, true> > digestpp::esch384_xof

XOEsch384 (Esch-384 in XOF mode)

Extendable output function based on Esch-384/Sparkle512. Higher security variant providing 192-bit security level.

Type:

Extendable output function (XOF).

Example:

 // Absorb a string and squeeze 32 bytes of output
digestpp::esch_xof hasher;
hasher.absorb("The quick brown fox jumps over the lazy dog");
std::cout << hasher.hexsqueeze(32) << '\n';

Example output:

355b7d373fdbbdbc9332586714e676087847a71d529a818930db17a268fd021f

See also

hasher, esch, esch256_xof