Add DSA_bits and DH_bits. More OpenSSL compatibility functions. Change-Id: I8e9429fcbc3e285f4c4ad9bdf4c1d9d3c73c3064 Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/53925 Commit-Queue: David Benjamin <davidben@google.com> Auto-Submit: David Benjamin <davidben@google.com> Reviewed-by: Adam Langley <agl@google.com> Commit-Queue: Adam Langley <agl@google.com>

diff --git a/crypto/dsa/dsa.c b/crypto/dsa/dsa.c
index 8e77ea3..b8e4653 100644
--- a/crypto/dsa/dsa.c
+++ b/crypto/dsa/dsa.c

@@ -130,6 +130,8 @@
   return 1;
 }
 
+unsigned DSA_bits(const DSA *dsa) { return BN_num_bits(dsa->p); }
+
 const BIGNUM *DSA_get0_pub_key(const DSA *dsa) { return dsa->pub_key; }
 
 const BIGNUM *DSA_get0_priv_key(const DSA *dsa) { return dsa->priv_key; }

diff --git a/crypto/fipsmodule/dh/dh.c b/crypto/fipsmodule/dh/dh.c
index 8b04117..31eaff4 100644
--- a/crypto/fipsmodule/dh/dh.c
+++ b/crypto/fipsmodule/dh/dh.c

@@ -111,6 +111,8 @@
   OPENSSL_free(dh);
 }
 
+unsigned DH_bits(const DH *dh) { return BN_num_bits(dh->p); }
+
 const BIGNUM *DH_get0_pub_key(const DH *dh) { return dh->pub_key; }
 
 const BIGNUM *DH_get0_priv_key(const DH *dh) { return dh->priv_key; }

diff --git a/include/openssl/dh.h b/include/openssl/dh.h
index 21c9623..20f2827 100644
--- a/include/openssl/dh.h
+++ b/include/openssl/dh.h

@@ -89,6 +89,9 @@
 
 // Properties.
 
+// DH_bits returns the size of |dh|'s group modulus, in bits.
+OPENSSL_EXPORT unsigned DH_bits(const DH *dh);
+
 // DH_get0_pub_key returns |dh|'s public key.
 OPENSSL_EXPORT const BIGNUM *DH_get0_pub_key(const DH *dh);
 

diff --git a/include/openssl/dsa.h b/include/openssl/dsa.h
index e6ddce6..7f10e54 100644
--- a/include/openssl/dsa.h
+++ b/include/openssl/dsa.h

@@ -94,6 +94,9 @@
 
 // Properties.
 
+// DSA_bits returns the size of |dsa|'s group modulus, in bits.
+OPENSSL_EXPORT unsigned DSA_bits(const DSA *dsa);
+
 // DSA_get0_pub_key returns |dsa|'s public key.
 OPENSSL_EXPORT const BIGNUM *DSA_get0_pub_key(const DSA *dsa);