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Consistently describe Ed25519 as a 255-bit curve
The coordinates are over $F_{2^{255}-19}$, so by the general definition of the bit size associated with the curve in the specification, the value for size attribute of keys is 255. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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@ -586,11 +586,11 @@
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/** The twisted Edwards curves Ed25519 and Ed448.
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*
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* These curves are suitable for EdDSA (#PSA_ALG_PURE_EDDSA for both curves,
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* #PSA_ALG_ED25519PH for the 256-bit curve,
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* #PSA_ALG_ED25519PH for the 255-bit curve,
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* #PSA_ALG_ED448PH for the 448-bit curve).
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*
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* This family comprises the following twisted Edwards curves:
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* - 256-bit: Edwards25519, the twisted Edwards curve birationally equivalent
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* - 255-bit: Edwards25519, the twisted Edwards curve birationally equivalent
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* to Curve25519.
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* Bernstein et al., _Twisted Edwards curves_, Africacrypt 2008.
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* - 448-bit: Edwards448, the twisted Edwards curve birationally equivalent
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@ -78,7 +78,7 @@ class KeyType:
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'PSA_ECC_FAMILY_SECT_R2': (163,),
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'PSA_ECC_FAMILY_BRAINPOOL_P_R1': (160, 192, 224, 256, 320, 384, 512),
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'PSA_ECC_FAMILY_MONTGOMERY': (255, 448),
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'PSA_ECC_FAMILY_TWISTED_EDWARDS': (256, 448),
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'PSA_ECC_FAMILY_TWISTED_EDWARDS': (255, 448),
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}
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KEY_TYPE_SIZES = {
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'PSA_KEY_TYPE_AES': (128, 192, 256), # exhaustive
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