cfedfdee95
Fixes the following security issues: Prevent over long nonces in ChaCha20-Poly1305 (CVE-2019-1543) ChaCha20-Poly1305 is an AEAD cipher, and requires a unique nonce input for every encryption operation. RFC 7539 specifies that the nonce value (IV) should be 96 bits (12 bytes). OpenSSL allows a variable nonce length and front pads the nonce with 0 bytes if it is less than 12 bytes. However it also incorrectly allows a nonce to be set of up to 16 bytes. In this case only the last 12 bytes are significant and any additional leading bytes are ignored. It is a requirement of using this cipher that nonce values are unique. Messages encrypted using a reused nonce value are susceptible to serious confidentiality and integrity attacks. If an application changes the default nonce length to be longer than 12 bytes and then makes a change to the leading bytes of the nonce expecting the new value to be a new unique nonce then such an application could inadvertently encrypt messages with a reused nonce. Additionally the ignored bytes in a long nonce are not covered by the integrity guarantee of this cipher. Any application that relies on the integrity of these ignored leading bytes of a long nonce may be further affected. Any OpenSSL internal use of this cipher, including in SSL/TLS, is safe because no such use sets such a long nonce value. However user applications that use this cipher directly and set a non-default nonce length to be longer than 12 bytes may be vulnerable. Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
6 lines
258 B
Plaintext
6 lines
258 B
Plaintext
# From https://www.openssl.org/source/openssl-1.1.1b.tar.gz.sha256
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sha256 f6fb3079ad15076154eda9413fed42877d668e7069d9b87396d0804fdb3f4c90 openssl-1.1.1c.tar.gz
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# License files
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sha256 c32913b33252e71190af2066f08115c69bc9fddadf3bf29296e20c835389841c LICENSE
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