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mbedtls_mpi_gcd(A, 0) returns 0 instead of A #4642

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gilles-peskine-arm opened this issue Jun 10, 2021 · 0 comments · Fixed by #4703
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mbedtls_mpi_gcd(A, 0) returns 0 instead of A #4642

gilles-peskine-arm opened this issue Jun 10, 2021 · 0 comments · Fixed by #4703
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bug component-crypto Crypto primitives and low-level interfaces size-s Estimated task size: small (~2d)

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@gilles-peskine-arm
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mbedtls_mpi_gcd(G, A, B) correctly sets G to the same value as B when A is zero, but sets G to zero when B is zero.

This has no impact on the crypto code in the library, but can impact applications that call mbedtls_mpi_gcd directly.
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bug component-crypto Crypto primitives and low-level interfaces size-s Estimated task size: small (~2d)
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Fix several bugs with the value 0 in bignum gilles-peskine-arm/mbedtls
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