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The ChaCha family of stream ciphers
The ChaCha family of stream ciphers D. J. Bernstein
Hash functions and ciphers The ChaCha family of stream ciphers The ChaCha family of stream ciphers, also known as Snuffle 2008, is a variant of the Salsa20 family of stream ciphers. The following paper introduces ChaCha and compares it to Salsa20:
- [chacha] 6pp. (PDF) D. J. Bernstein. ChaCha, a variant of Salsa20. Document ID: 4027b5256e17b9796842e6d0f68b0b5e. URL: https://cr.yp.to/papers.html#chacha. Date: 2008.01.28. Supersedes: (PDF) 2008.01.20.
The Salsa20 directory in version 2008.01.20 of the eSTREAM benchmarking suite includes several implementations of ChaCha8 (and ChaCha12 and ChaCha20):
- ref, a reference implementation: chacha.c, Makefile, ecrypt-sync.h.
- regs: chacha.c, Makefile, ecrypt-sync.h. Similar to ref but uses separate temporary variables instead of a temporary array.
- merged: chacha.c, Makefile, ecrypt-sync.h. Similar to regs but inlines the ChaCha core.
- x86-1, specific to the Pentium, Athlon, and other x86 chips: chacha.q, chacha.s, Makefile, ecrypt-sync.h.
- x86-mmx, specific to the Pentium Pro and other CPUs with MMX registers: chacha.q, chacha.s, Makefile, ecrypt-sync.h. Uses some MMX registers as substitutes for stack positions.
- x86-xmm, specific to the Pentium 4 and other CPUs with SSE2 instructions: chacha.q, chacha.s, Makefile, ecrypt-sync.h.
- x86-xmm2, specific to the Pentium 4 and other CPUs with SSE2 instructions: chacha.q, chacha.s, Makefile, ecrypt-sync.h. Selects different SSE2 instructions.
- x86-xmm5, specific to the Pentium 4 and other CPUs with SSE2 instructions: chacha.q, chacha.s, Makefile, ecrypt-sync.h. Handles four blocks in parallel. Based on analogous Salsa20 code by Wei Dai.
- amd64-3, specific to the Athlon 64, Core 2 Duo, and other AMD64 chips: chacha.q, chacha.s, Makefile, ecrypt-sync.h.
- amd64-xmm6, specific to the Athlon 64, Core 2 Duo, and other AMD64 chips: chacha.q, chacha.s, Makefile, ecrypt-sync.h. Translation of x86-xmm5, with some additional instruction scheduling.
- ppc-altivec, specific to the PowerPC G4 and other CPUs with AltiVec instructions: chacha.c, Makefile, ecrypt-sync.h. Based on analogous Salsa20 code by Matthijs van Duin.
- sparc, specific to the UltraSPARC and other 64-bit SPARC chips: chacha.q, chacha.s, Makefile, ecrypt-sync.h.
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