crypto: drbg - HMAC-SHA1 DRBG has crypto strength of 128 bits

The patch corrects the security strength of the HMAC-SHA1 DRBG to 128
bits. This strength defines the size of the seed required for the DRBG.
Thus, the patch lowers the seeding requirement from 256 bits to 128 bits
for HMAC-SHA1.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/drbg.c b/crypto/drbg.c
index a76b3cb03cf4e55074a9db229584d2a66a701cc4..84478cb8d02a721b231ddc9544ef1f27d9dba52b 100644 (file)
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -184,7 +184,7 @@ static const struct drbg_core drbg_cores[] = {
 #endif /* CONFIG_CRYPTO_DRBG_HASH */
 #ifdef CONFIG_CRYPTO_DRBG_HMAC
        {
-               .flags = DRBG_HMAC | DRBG_STRENGTH256,
+               .flags = DRBG_HMAC | DRBG_STRENGTH128,
                .statelen = 20, /* block length of cipher */
                .max_addtllen = 35,
                .max_bits = 19,