liboqs/docs/algorithms/kem/ntruprime.md

NTRU-Prime

• Algorithm type: Key encapsulation mechanism.
• Main cryptographic assumption: NTRU.
• Principal submitters: Daniel J. Bernstein, Billy Bob Brumley, Ming-Shing Chen, Chitchanok Chuengsatiansup, Tanja Lange, Adrian Marotzke, Bo-Yuan Peng, Nicola Tuveri, Christine van Vredendaal, Bo-Yin Yang.
• Authors' website: https://ntruprime.cr.yp.to
• Specification version: supercop-20200826.
• Implementation source: 5b8ef3baea, which takes it from:
  • https://github.com/jschanck/package-pqclean/tree/4d9f08c3/ntruprime, which takes it from:
  • supercop-20210604
• Implementation license (SPDX-Identifier): Public domain.

Parameter set summary

Parameter set	Security model	Claimed NIST Level	Public key size (bytes)	Secret key size (bytes)	Ciphertext size (bytes)	Shared secret size (bytes)
ntrulpr653	IND-CCA2	1	897	1125	1025	32
ntrulpr761	IND-CCA2	2	1039	1294	1167	32
ntrulpr857	IND-CCA2	3	1184	1463	1312	32
ntrulpr1277	IND-CCA2	5	1847	2231	1975	32
sntrup653	IND-CCA2	1	994	1518	897	32
sntrup761	IND-CCA2	2	1158	1763	1039	32
sntrup857	IND-CCA2	3	1322	1999	1184	32
sntrup1277	IND-CCA2	5	2067	3059	1847	32

ntrulpr653 implementation characteristics

Identifier in upstream	Supported architecture(s)	Supported operating system(s)	CPU extension(s) used	No branching-on-secrets claimed?	No branching-on-secrets checked by valgrind?	Large stack usage?‡
clean	All	All	None	True	True	False
avx2	x86_64	Linux,Darwin	AVX2	False	True	False

Are implementations chosen based on runtime CPU feature detection? Yes.

‡For an explanation of what this denotes, consult the Explanation of Terms section at the end of this file.

ntrulpr761 implementation characteristics

Identifier in upstream	Supported architecture(s)	Supported operating system(s)	CPU extension(s) used	No branching-on-secrets claimed?	No branching-on-secrets checked by valgrind?	Large stack usage?
clean	All	All	None	True	True	False
avx2	x86_64	Linux,Darwin	AVX2	False	True	False

Are implementations chosen based on runtime CPU feature detection? Yes.

ntrulpr857 implementation characteristics

Identifier in upstream	Supported architecture(s)	Supported operating system(s)	CPU extension(s) used	No branching-on-secrets claimed?	No branching-on-secrets checked by valgrind?	Large stack usage?
clean	All	All	None	True	True	False
avx2	x86_64	Linux,Darwin	AVX2	False	True	False

Are implementations chosen based on runtime CPU feature detection? Yes.

ntrulpr1277 implementation characteristics

Identifier in upstream	Supported architecture(s)	Supported operating system(s)	CPU extension(s) used	No branching-on-secrets claimed?	No branching-on-secrets checked by valgrind?	Large stack usage?
clean	All	All	None	True	True	False
avx2	x86_64	Linux,Darwin	AVX2	False	True	False

Are implementations chosen based on runtime CPU feature detection? Yes.

sntrup653 implementation characteristics

Identifier in upstream	Supported architecture(s)	Supported operating system(s)	CPU extension(s) used	No branching-on-secrets claimed?	No branching-on-secrets checked by valgrind?	Large stack usage?
clean	All	All	None	True	True	False
avx2	x86_64	Linux,Darwin	AVX2	False	True	False

Are implementations chosen based on runtime CPU feature detection? Yes.

sntrup761 implementation characteristics

Identifier in upstream	Supported architecture(s)	Supported operating system(s)	CPU extension(s) used	No branching-on-secrets claimed?	No branching-on-secrets checked by valgrind?	Large stack usage?
clean	All	All	None	True	True	False
avx2	x86_64	Linux,Darwin	AVX2	False	True	False

Are implementations chosen based on runtime CPU feature detection? Yes.

sntrup857 implementation characteristics

Identifier in upstream	Supported architecture(s)	Supported operating system(s)	CPU extension(s) used	No branching-on-secrets claimed?	No branching-on-secrets checked by valgrind?	Large stack usage?
clean	All	All	None	True	True	False
avx2	x86_64	Linux,Darwin	AVX2	False	True	False

Are implementations chosen based on runtime CPU feature detection? Yes.

sntrup1277 implementation characteristics

Identifier in upstream	Supported architecture(s)	Supported operating system(s)	CPU extension(s) used	No branching-on-secrets claimed?	No branching-on-secrets checked by valgrind?	Large stack usage?
clean	All	All	None	True	True	False
avx2	x86_64	Linux,Darwin	AVX2	False	True	False

Are implementations chosen based on runtime CPU feature detection? Yes.

Explanation of Terms

• Large Stack Usage: Implementations identified as having such may cause failures when running in threads or in constrained environments.