Add ChaCha20-Poly1305 ciphers for TLS1.2#106435
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jerome-pouiller wants to merge 1 commit intozephyrproject-rtos:mainfrom
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Add ChaCha20-Poly1305 ciphers for TLS1.2#106435jerome-pouiller wants to merge 1 commit intozephyrproject-rtos:mainfrom
jerome-pouiller wants to merge 1 commit intozephyrproject-rtos:mainfrom
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Pull request overview
Adds TLS 1.2 ChaCha20-Poly1305 ciphersuite Kconfig options to better support targets without hardware AES acceleration.
Changes:
- Introduce
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256Kconfig option with the required TLS/X.509, ECDHE-ECDSA, and PSA crypto selects. - Introduce
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256Kconfig option with the required TLS/X.509, ECDHE-RSA, and PSA crypto selects.
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jerome-pouiller
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ChaCha20-Poly1305 is the preferred cipher on platforms lacking hardware AES acceleration, which is common on embedded targets. Adding this ciphersuite allows Zephyr devices to negotiate it when connecting to servers that support it (e.g. nginx, OpenSSL), avoiding a fallback to AES-based suites. Assisted-by: GitHub Copilot:claude-sonnet-4.6 Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
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valeriosetti and
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d3zd3z
approved these changes
Mar 27, 2026
valeriosetti
approved these changes
Mar 27, 2026
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ChaCha20-Poly1305 is already declared for TLS 1.3. Since it is the preferred cipher on platforms lacking hardware AES acceleration (which is common on embedded targets), I believe it also make sense to declare this cipher for TLS 1.2.