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| author | Sebastian Andrzej Siewior <sebastian@breakpoint.cc> | 2017-10-18 13:30:23 +0200 |
|---|---|---|
| committer | Richard Levitte <levitte@openssl.org> | 2017-12-11 12:53:07 +0100 |
| commit | cac19d19e7d6f252ff9aea60d85e0c0fd71a117f (patch) | |
| tree | c99c44c5a70e11d5662f4e187e1fa34bf67f923d /crypto/rsa | |
| parent | a8ea8018fa187e22fb4989450b550589e20f62c2 (diff) | |
| download | openssl-cac19d19e7d6f252ff9aea60d85e0c0fd71a117f.zip openssl-cac19d19e7d6f252ff9aea60d85e0c0fd71a117f.tar.gz openssl-cac19d19e7d6f252ff9aea60d85e0c0fd71a117f.tar.bz2 | |
rsa: Do not allow less than 512 bit RSA keys
As per documentation, the RSA keys should not be smaller than 64bit (the
documentation mentions something about a quirk in the prime generation
algorithm). I am adding check into the code which used to be 16 for some
reason.
My primary motivation is to get rid of the last sentence in the
documentation which suggest that typical keys have 1024 bits (instead
updating it to the now default 2048).
I *assume* that keys less than the 2048 bits (say 512) are used for
education purposes.
The 512 bits as the minimum have been suggested by Bernd Edlinger.
Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4547)
Diffstat (limited to 'crypto/rsa')
| -rw-r--r-- | crypto/rsa/rsa_gen.c | 6 | ||||
| -rw-r--r-- | crypto/rsa/rsa_locl.h | 1 | ||||
| -rw-r--r-- | crypto/rsa/rsa_pmeth.c | 2 |
3 files changed, 3 insertions, 6 deletions
diff --git a/crypto/rsa/rsa_gen.c b/crypto/rsa/rsa_gen.c index eda23b5..4b9296e 100644 --- a/crypto/rsa/rsa_gen.c +++ b/crypto/rsa/rsa_gen.c @@ -72,11 +72,7 @@ static int rsa_builtin_keygen(RSA *rsa, int bits, int primes, BIGNUM *e_value, BN_CTX *ctx = NULL; BN_ULONG bitst = 0; - /* - * When generating ridiculously small keys, we can get stuck - * continually regenerating the same prime values. - */ - if (bits < 16) { + if (bits < RSA_MIN_MODULUS_BITS) { ok = 0; /* we set our own err */ RSAerr(RSA_F_RSA_BUILTIN_KEYGEN, RSA_R_KEY_SIZE_TOO_SMALL); goto err; diff --git a/crypto/rsa/rsa_locl.h b/crypto/rsa/rsa_locl.h index 52d839d..9bd53be 100644 --- a/crypto/rsa/rsa_locl.h +++ b/crypto/rsa/rsa_locl.h @@ -12,6 +12,7 @@ #define RSA_MAX_PRIME_NUM 16 #define RSA_MIN_PRIME_SIZE 64 +#define RSA_MIN_MODULUS_BITS 512 typedef struct rsa_prime_info_st { BIGNUM *r; diff --git a/crypto/rsa/rsa_pmeth.c b/crypto/rsa/rsa_pmeth.c index 8a114cf..e11ed1f 100644 --- a/crypto/rsa/rsa_pmeth.c +++ b/crypto/rsa/rsa_pmeth.c @@ -459,7 +459,7 @@ static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) return 1; case EVP_PKEY_CTRL_RSA_KEYGEN_BITS: - if (p1 < 512) { + if (p1 < RSA_MIN_MODULUS_BITS) { RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL); return -2; } |