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Clarify the trailer field situation

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
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Manuel Pégourié-Gonnard 2022-02-10 13:07:22 +01:00
parent c7f3254379
commit c70013e4bc
1 changed files with 2 additions and 1 deletions
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docs/architecture/psa-migration/psa-limitations.md
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@ -83,7 +83,8 @@ the hash algorithm potentially used to hash the message being signed:
- a mask generation function - a mask generation function
- most commonly MGF1, which in turn is parametrized by a hash algorithm - most commonly MGF1, which in turn is parametrized by a hash algorithm
- a salt length - a salt length
- a trailer field - this is universally 0xBC as far as I've seen - a trailer field - the value is fixed to 0xBC by PKCS#1 v2.1, but was left
configurable in the original scheme; 0xBC is used everywhere in pratice.
Both the existing `mbedtls_` API and the PSA API support only MGF1 as the Both the existing `mbedtls_` API and the PSA API support only MGF1 as the
generation function (and only 0xBC as the trailer field), but there are generation function (and only 0xBC as the trailer field), but there are