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Note that HMAC_FIPS_MIN_KEY is also salt len min for HKDF #9515

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Merged
douzzer merged 2 commits into from
Dec 11, 2025
Merged

Note that HMAC_FIPS_MIN_KEY is also salt len min for HKDF #9515

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008132c
Note that HMAC_FIPS_MIN_KEY is also salt len min for HKDF
anhu Dec 10, 2025
cd4f969
Better error message too.
anhu Dec 11, 2025
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2 changes: 1 addition & 1 deletion wolfcrypt/src/error.c
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Original file line number Diff line number Diff line change
Expand Up @@ -315,7 +315,7 @@ const char* wc_GetErrorString(int error)
return "Random Number Generator failed";

case HMAC_MIN_KEYLEN_E:
return "FIPS Mode HMAC Minimum Key Length error";
return "FIPS Mode HMAC Minimum Key or Salt Length error";

case RSA_PAD_E:
return "Rsa Padding error";
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5 changes: 3 additions & 2 deletions wolfssl/wolfcrypt/hmac.h
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Expand Up @@ -66,8 +66,9 @@
#define WC_HMAC_INNER_HASH_KEYED_DEV 2

enum {
HMAC_FIPS_MIN_KEY = 14, /* 112 bit key length minimum */

HMAC_FIPS_MIN_KEY = 14, /* 112 bit key length minimum. Note that this
* minimum also applies to the salt length for
* HKDF. */
IPAD = 0x36,
OPAD = 0x5C,

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