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Fix the PSA_ALG_RSA_PSS salt length documentation #4949

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Fix the PSA_ALG_RSA_PSS salt length documentation #4949

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13 changes: 9 additions & 4 deletions include/psa/crypto_values.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1345,10 +1345,15 @@
*
* This is the signature scheme defined by RFC 8017
* (PKCS#1: RSA Cryptography Specifications) under the name
* RSASSA-PSS, with the message generation function MGF1, and with
* a salt length equal to the length of the hash. The specified
* hash algorithm is used to hash the input message, to create the
* salted hash, and for the mask generation.
* RSASSA-PSS, with the message generation function MGF1.
* The specified hash algorithm is used to hash the input message, to create
* the salted hash, and for the mask generation.
*
* When creating a signature, the salt length is equal to the length of
* the hash, or the largest possible salt length for the algorithm and key
* size if that is smaller than the hash length.
* When verifying a signature, any salt length permitted by the RSASSA-PSS
* signature algorithm is accepted.
*
* \param hash_alg A hash algorithm (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_HASH(\p hash_alg) is true).
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