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Implementation for a simple order-preserving encryption scheme.

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This is meant for use when encrypting the current time within the
period in order to get a monotonically increasing revision counter
without actually revealing our view of the time.

This scheme is far from the most state-of-the-art: don't use it for
anything else without careful analysis by somebody much smarter than
I am.

See ticket #25552 for some rationale for this logic.
This commit is contained in:
Nick Mathewson
2018-05-10 08:46:36 -04:00
parent 860b9a9918
commit 3a45f6ffe9
8 changed files with 407 additions and 0 deletions
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src/lib/crypt_ops/include.am
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@@ -14,6 +14,7 @@ src_lib_libtor_crypt_ops_a_SOURCES = \
src/lib/crypt_ops/crypto_ed25519.c \
src/lib/crypt_ops/crypto_format.c \
src/lib/crypt_ops/crypto_hkdf.c \
src/lib/crypt_ops/crypto_ope.c \
src/lib/crypt_ops/crypto_openssl_mgt.c \
src/lib/crypt_ops/crypto_pwbox.c \
src/lib/crypt_ops/crypto_rand.c \
@@ -37,6 +38,7 @@ noinst_HEADERS += \
src/lib/crypt_ops/crypto.h \
src/lib/crypt_ops/crypto_hkdf.h \
src/lib/crypt_ops/crypto_openssl_mgt.h \
src/lib/crypt_ops/crypto_ope.h \
src/lib/crypt_ops/crypto_pwbox.h \
src/lib/crypt_ops/crypto_rand.h \
src/lib/crypt_ops/crypto_rsa.h \