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-rw-r--r--src/lib/kdf/hkdf/hkdf.cpp4
-rw-r--r--src/lib/kdf/hkdf/hkdf.h3
-rw-r--r--src/lib/kdf/kdf.h45
-rw-r--r--src/lib/kdf/kdf1/kdf1.cpp4
-rw-r--r--src/lib/kdf/kdf1/kdf1.h3
-rw-r--r--src/lib/kdf/kdf2/kdf2.cpp4
-rw-r--r--src/lib/kdf/kdf2/kdf2.h3
-rw-r--r--src/lib/kdf/prf_tls/prf_tls.cpp23
-rw-r--r--src/lib/kdf/prf_tls/prf_tls.h6
-rw-r--r--src/lib/kdf/prf_x942/prf_x942.cpp10
-rw-r--r--src/lib/kdf/prf_x942/prf_x942.h3
-rw-r--r--src/lib/kdf/sp800_108/sp800_108.cpp43
-rw-r--r--src/lib/kdf/sp800_108/sp800_108.h60
-rw-r--r--src/lib/kdf/sp800_56c/sp800_56c.cpp7
-rw-r--r--src/lib/kdf/sp800_56c/sp800_56c.h20
15 files changed, 198 insertions, 40 deletions
diff --git a/src/lib/kdf/hkdf/hkdf.cpp b/src/lib/kdf/hkdf/hkdf.cpp
index 6f83853f9..56dc72f09 100644
--- a/src/lib/kdf/hkdf/hkdf.cpp
+++ b/src/lib/kdf/hkdf/hkdf.cpp
@@ -22,7 +22,8 @@ HKDF* HKDF::make(const Spec& spec)
size_t HKDF::kdf(byte out[], size_t out_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const
{
m_prf->set_key(secret, secret_len);
@@ -33,6 +34,7 @@ size_t HKDF::kdf(byte out[], size_t out_len,
while(offset != out_len && counter != 0)
{
m_prf->update(h);
+ m_prf->update(label, label_len);
m_prf->update(salt, salt_len);
m_prf->update(counter++);
m_prf->final(h);
diff --git a/src/lib/kdf/hkdf/hkdf.h b/src/lib/kdf/hkdf/hkdf.h
index 3e3e2b73a..1dba82ee2 100644
--- a/src/lib/kdf/hkdf/hkdf.h
+++ b/src/lib/kdf/hkdf/hkdf.h
@@ -31,7 +31,8 @@ class BOTAN_DLL HKDF final : public KDF
size_t kdf(byte out[], size_t out_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const override;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const override;
private:
std::unique_ptr<MessageAuthenticationCode> m_prf;
diff --git a/src/lib/kdf/kdf.h b/src/lib/kdf/kdf.h
index 88b50c8b8..3c8a7a013 100644
--- a/src/lib/kdf/kdf.h
+++ b/src/lib/kdf/kdf.h
@@ -40,7 +40,8 @@ class BOTAN_DLL KDF
virtual size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const = 0;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const = 0;
/**
@@ -50,15 +51,19 @@ class BOTAN_DLL KDF
* @param secret_len size of secret in bytes
* @param salt a diversifier
* @param salt_len size of salt in bytes
+ * @param label purpose for the derived keying material
+ * @param label_len size of label in bytes
*/
secure_vector<byte> derive_key(size_t key_len,
const byte secret[],
size_t secret_len,
const byte salt[],
- size_t salt_len) const
+ size_t salt_len,
+ const byte label[] = nullptr,
+ size_t label_len = 0) const
{
secure_vector<byte> key(key_len);
- key.resize(kdf(key.data(), key.size(), secret, secret_len, salt, salt_len));
+ key.resize(kdf(key.data(), key.size(), secret, secret_len, salt, salt_len, label, label_len));
return key;
}
@@ -67,14 +72,19 @@ class BOTAN_DLL KDF
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param salt a diversifier
+ * @param label purpose for the derived keying material
*/
secure_vector<byte> derive_key(size_t key_len,
const secure_vector<byte>& secret,
- const std::string& salt = "") const
+ const std::string& salt = "",
+ const std::string& label = "") const
{
return derive_key(key_len, secret.data(), secret.size(),
reinterpret_cast<const byte*>(salt.data()),
- salt.length());
+ salt.length(),
+ reinterpret_cast<const byte*>(label.data()),
+ label.length());
+
}
/**
@@ -82,15 +92,18 @@ class BOTAN_DLL KDF
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param salt a diversifier
+ * @param label purpose for the derived keying material
*/
- template<typename Alloc, typename Alloc2>
+ template<typename Alloc, typename Alloc2, typename Alloc3>
secure_vector<byte> derive_key(size_t key_len,
const std::vector<byte, Alloc>& secret,
- const std::vector<byte, Alloc2>& salt) const
+ const std::vector<byte, Alloc2>& salt,
+ const std::vector<byte, Alloc3>& label) const
{
return derive_key(key_len,
secret.data(), secret.size(),
- salt.data(), salt.size());
+ salt.data(), salt.size(),
+ label.data(), label.size());
}
/**
@@ -99,15 +112,19 @@ class BOTAN_DLL KDF
* @param secret the secret input
* @param salt a diversifier
* @param salt_len size of salt in bytes
+ * @param label purpose for the derived keying material
*/
secure_vector<byte> derive_key(size_t key_len,
const secure_vector<byte>& secret,
const byte salt[],
- size_t salt_len) const
+ size_t salt_len,
+ const std::string& label = "") const
{
return derive_key(key_len,
secret.data(), secret.size(),
- salt, salt_len);
+ salt, salt_len,
+ reinterpret_cast<const byte*>(label.data()),
+ label.size());
}
/**
@@ -116,15 +133,19 @@ class BOTAN_DLL KDF
* @param secret the secret input
* @param secret_len size of secret in bytes
* @param salt a diversifier
+ * @param label purpose for the derived keying material
*/
secure_vector<byte> derive_key(size_t key_len,
const byte secret[],
size_t secret_len,
- const std::string& salt = "") const
+ const std::string& salt = "",
+ const std::string& label = "") const
{
return derive_key(key_len, secret, secret_len,
reinterpret_cast<const byte*>(salt.data()),
- salt.length());
+ salt.length(),
+ reinterpret_cast<const byte*>(label.data()),
+ label.length());
}
virtual KDF* clone() const = 0;
diff --git a/src/lib/kdf/kdf1/kdf1.cpp b/src/lib/kdf/kdf1/kdf1.cpp
index c7ea3c37e..14dddc5f4 100644
--- a/src/lib/kdf/kdf1/kdf1.cpp
+++ b/src/lib/kdf/kdf1/kdf1.cpp
@@ -11,9 +11,11 @@ namespace Botan {
size_t KDF1::kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const
{
m_hash->update(secret, secret_len);
+ m_hash->update(label, label_len);
m_hash->update(salt, salt_len);
if(key_len < m_hash->output_length())
diff --git a/src/lib/kdf/kdf1/kdf1.h b/src/lib/kdf/kdf1/kdf1.h
index adaa84894..59bff4d8d 100644
--- a/src/lib/kdf/kdf1/kdf1.h
+++ b/src/lib/kdf/kdf1/kdf1.h
@@ -25,7 +25,8 @@ class BOTAN_DLL KDF1 final : public KDF
size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const override;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const override;
explicit KDF1(HashFunction* h) : m_hash(h) {}
private:
diff --git a/src/lib/kdf/kdf2/kdf2.cpp b/src/lib/kdf/kdf2/kdf2.cpp
index df2b7a91c..760ebfc83 100644
--- a/src/lib/kdf/kdf2/kdf2.cpp
+++ b/src/lib/kdf/kdf2/kdf2.cpp
@@ -11,7 +11,8 @@ namespace Botan {
size_t KDF2::kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const
{
u32bit counter = 1;
secure_vector<byte> h;
@@ -21,6 +22,7 @@ size_t KDF2::kdf(byte key[], size_t key_len,
{
m_hash->update(secret, secret_len);
m_hash->update_be(counter++);
+ m_hash->update(label, label_len);
m_hash->update(salt, salt_len);
m_hash->final(h);
diff --git a/src/lib/kdf/kdf2/kdf2.h b/src/lib/kdf/kdf2/kdf2.h
index 7403df21c..600f7c91c 100644
--- a/src/lib/kdf/kdf2/kdf2.h
+++ b/src/lib/kdf/kdf2/kdf2.h
@@ -25,7 +25,8 @@ class BOTAN_DLL KDF2 final : public KDF
size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const override;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const override;
explicit KDF2(HashFunction* h) : m_hash(h) {}
private:
diff --git a/src/lib/kdf/prf_tls/prf_tls.cpp b/src/lib/kdf/prf_tls/prf_tls.cpp
index 547b0c9c8..14b330901 100644
--- a/src/lib/kdf/prf_tls/prf_tls.cpp
+++ b/src/lib/kdf/prf_tls/prf_tls.cpp
@@ -73,23 +73,36 @@ void P_hash(byte out[], size_t out_len,
size_t TLS_PRF::kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const
{
const size_t S1_len = (secret_len + 1) / 2,
S2_len = (secret_len + 1) / 2;
const byte* S1 = secret;
const byte* S2 = secret + (secret_len - S2_len);
+ secure_vector<byte> msg;
- P_hash(key, key_len, *m_hmac_md5, S1, S1_len, salt, salt_len);
- P_hash(key, key_len, *m_hmac_sha1, S2, S2_len, salt, salt_len);
+ msg.reserve(label_len + salt_len);
+ msg += std::make_pair(label, label_len);
+ msg += std::make_pair(salt, salt_len);
+
+ P_hash(key, key_len, *m_hmac_md5, S1, S1_len, msg.data(), msg.size());
+ P_hash(key, key_len, *m_hmac_sha1, S2, S2_len, msg.data(), msg.size());
return key_len;
}
size_t TLS_12_PRF::kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const
{
- P_hash(key, key_len, *m_mac, secret, secret_len, salt, salt_len);
+ secure_vector<byte> msg;
+
+ msg.reserve(label_len + salt_len);
+ msg += std::make_pair(label, label_len);
+ msg += std::make_pair(salt, salt_len);
+
+ P_hash(key, key_len, *m_mac, secret, secret_len, msg.data(), msg.size());
return key_len;
}
diff --git a/src/lib/kdf/prf_tls/prf_tls.h b/src/lib/kdf/prf_tls/prf_tls.h
index a51006d88..37a517125 100644
--- a/src/lib/kdf/prf_tls/prf_tls.h
+++ b/src/lib/kdf/prf_tls/prf_tls.h
@@ -25,7 +25,8 @@ class BOTAN_DLL TLS_PRF final : public KDF
size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const override;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const override;
TLS_PRF();
private:
@@ -45,7 +46,8 @@ class BOTAN_DLL TLS_12_PRF final : public KDF
size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const override;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const override;
explicit TLS_12_PRF(MessageAuthenticationCode* mac) : m_mac(mac) {}
diff --git a/src/lib/kdf/prf_x942/prf_x942.cpp b/src/lib/kdf/prf_x942/prf_x942.cpp
index fb8de1e85..206cf6ce6 100644
--- a/src/lib/kdf/prf_x942/prf_x942.cpp
+++ b/src/lib/kdf/prf_x942/prf_x942.cpp
@@ -30,15 +30,21 @@ std::vector<byte> encode_x942_int(u32bit n)
size_t X942_PRF::kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const
{
std::unique_ptr<HashFunction> hash(HashFunction::create("SHA-160"));
const OID kek_algo(m_key_wrap_oid);
secure_vector<byte> h;
+ secure_vector<byte> in;
size_t offset = 0;
u32bit counter = 1;
+ in.reserve(salt_len + label_len);
+ in += std::make_pair(label,label_len);
+ in += std::make_pair(salt,salt_len);
+
while(offset != key_len && counter)
{
hash->update(secret, secret_len);
@@ -54,7 +60,7 @@ size_t X942_PRF::kdf(byte key[], size_t key_len,
.encode_if(salt_len != 0,
DER_Encoder()
.start_explicit(0)
- .encode(salt, salt_len, OCTET_STRING)
+ .encode(in, OCTET_STRING)
.end_explicit()
)
diff --git a/src/lib/kdf/prf_x942/prf_x942.h b/src/lib/kdf/prf_x942/prf_x942.h
index c15be9845..afe56de80 100644
--- a/src/lib/kdf/prf_x942/prf_x942.h
+++ b/src/lib/kdf/prf_x942/prf_x942.h
@@ -24,7 +24,8 @@ class BOTAN_DLL X942_PRF final : public KDF
size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const override;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const override;
explicit X942_PRF(const std::string& oid);
private:
diff --git a/src/lib/kdf/sp800_108/sp800_108.cpp b/src/lib/kdf/sp800_108/sp800_108.cpp
index 873db814c..aafb349b2 100644
--- a/src/lib/kdf/sp800_108/sp800_108.cpp
+++ b/src/lib/kdf/sp800_108/sp800_108.cpp
@@ -8,6 +8,8 @@
#include <botan/sp800_108.h>
#include <botan/hmac.h>
+#include <iterator>
+
namespace Botan {
SP800_108_Counter* SP800_108_Counter::make(const Spec& spec)
@@ -23,13 +25,18 @@ SP800_108_Counter* SP800_108_Counter::make(const Spec& spec)
size_t SP800_108_Counter::kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const
{
const std::size_t prf_len = m_prf->output_length();
+ const byte delim = 0;
byte *p = key;
uint32_t counter = 1;
+ uint32_t length = key_len * 8;
+ byte be_len[4] = { 0 };
secure_vector<byte> tmp;
+ store_be(length, be_len);
m_prf->set_key(secret, secret_len);
while(p < key + key_len && counter != 0)
@@ -40,7 +47,10 @@ size_t SP800_108_Counter::kdf(byte key[], size_t key_len,
store_be(counter, be_cnt);
m_prf->update(be_cnt,4);
- m_prf->update(salt, salt_len);
+ m_prf->update(label,label_len);
+ m_prf->update(delim);
+ m_prf->update(salt,salt_len);
+ m_prf->update(be_len,4);
m_prf->final(tmp);
std::move(tmp.begin(), tmp.begin() + to_copy, p);
@@ -68,16 +78,21 @@ SP800_108_Feedback* SP800_108_Feedback::make(const Spec& spec)
size_t SP800_108_Feedback::kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const
{
const std::size_t prf_len = m_prf->output_length();
const std::size_t iv_len = (salt_len >= prf_len ? prf_len : 0);
+ const byte delim = 0;
byte *p = key;
uint32_t counter = 1;
+ uint32_t length = key_len * 8;
+ byte be_len[4] = { 0 };
secure_vector< byte > prev(salt, salt + iv_len);
secure_vector< byte > ctx(salt + iv_len, salt + salt_len);
+ store_be(length, be_len);
m_prf->set_key(secret, secret_len);
while(p < key + key_len && counter != 0)
@@ -89,7 +104,10 @@ size_t SP800_108_Feedback::kdf(byte key[], size_t key_len,
m_prf->update(prev);
m_prf->update(be_cnt,4);
+ m_prf->update(label,label_len);
+ m_prf->update(delim);
m_prf->update(ctx);
+ m_prf->update(be_len,4);
m_prf->final(prev);
std::copy(prev.begin(), prev.begin() + to_copy, p);
@@ -117,15 +135,27 @@ SP800_108_Pipeline* SP800_108_Pipeline::make(const Spec& spec)
size_t SP800_108_Pipeline::kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const
{
const std::size_t prf_len = m_prf->output_length();
+ const byte delim = 0;
+
byte *p = key;
uint32_t counter = 1;
- secure_vector<byte> ai(salt, salt + salt_len), ki;
+ uint32_t length = key_len * 8;
+ byte be_len[4] = { 0 };
+ secure_vector<byte> ai, ki;
+ store_be(length, be_len);
m_prf->set_key(secret,secret_len);
+ // A(0)
+ std::copy(label,label + label_len,std::back_inserter(ai));
+ ai.emplace_back(delim);
+ std::copy(salt,salt + salt_len,std::back_inserter(ai));
+ std::copy(be_len,be_len + 4,std::back_inserter(ai));
+
while(p < key + key_len && counter != 0)
{
// A(i)
@@ -140,7 +170,10 @@ size_t SP800_108_Pipeline::kdf(byte key[], size_t key_len,
m_prf->update(ai);
m_prf->update(be_cnt,4);
+ m_prf->update(label, label_len);
+ m_prf->update(delim);
m_prf->update(salt, salt_len);
+ m_prf->update(be_len,4);
m_prf->final(ki);
std::copy(ki.begin(), ki.begin() + to_copy, p);
diff --git a/src/lib/kdf/sp800_108/sp800_108.h b/src/lib/kdf/sp800_108/sp800_108.h
index 0acdfacf9..71a918c15 100644
--- a/src/lib/kdf/sp800_108/sp800_108.h
+++ b/src/lib/kdf/sp800_108/sp800_108.h
@@ -23,9 +23,27 @@ class BOTAN_DLL SP800_108_Counter : public KDF
KDF* clone() const override { return new SP800_108_Counter(m_prf->clone()); }
+ /**
+ * Derive a key using the SP800-108 KDF in Counter mode.
+ *
+ * The implementation hard codes the length of [L]_2
+ * and [i]_2 (the value r) to 32 bits.
+ *
+ * @param key resulting keying material
+ * @param key_len the desired output length in bytes
+ * @param secret K_I
+ * @param secret_len size of K_I in bytes
+ * @param salt Context
+ * @param salt_len size of Context in bytes
+ * @param label Label
+ * @param label_len size of Label in bytes
+ *
+ * @throws Invalid_Argument key_len > 2^32
+ */
size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const override;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const override;
SP800_108_Counter(MessageAuthenticationCode* mac) : m_prf(mac) {}
@@ -44,9 +62,27 @@ class BOTAN_DLL SP800_108_Feedback : public KDF
KDF* clone() const override { return new SP800_108_Feedback(m_prf->clone()); }
+ /**
+ * Derive a key using the SP800-108 KDF in Feedback mode.
+ *
+ * The implementation uses the optional counter i and hard
+ * codes the length of [L]_2 and [i]_2 (the value r) to 32 bits.
+ *
+ * @param key resulting keying material
+ * @param key_len the desired output length in bytes
+ * @param secret K_I
+ * @param secret_len size of K_I in bytes
+ * @param salt IV || Context
+ * @param salt_len size of Context plus IV in bytes
+ * @param label Label
+ * @param label_len size of Label in bytes
+ *
+ * @throws Invalid_Argument key_len > 2^32
+ */
size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const override;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const override;
SP800_108_Feedback(MessageAuthenticationCode* mac) : m_prf(mac) {}
@@ -65,9 +101,27 @@ class BOTAN_DLL SP800_108_Pipeline : public KDF
KDF* clone() const override { return new SP800_108_Pipeline(m_prf->clone()); }
+ /**
+ * Derive a key using the SP800-108 KDF in Double Pipeline mode.
+ *
+ * The implementation uses the optional counter i and hard
+ * codes the length of [L]_2 and [i]_2 (the value r) to 32 bits.
+ *
+ * @param key resulting keying material
+ * @param key_len the desired output length in bytes
+ * @param secret K_I
+ * @param secret_len size of K_I in bytes
+ * @param salt Context
+ * @param salt_len size of Context in bytes
+ * @param label Label
+ * @param label_len size of Label in bytes
+ *
+ * @throws Invalid_Argument key_len > 2^32
+ */
size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const override;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const override;
SP800_108_Pipeline(MessageAuthenticationCode* mac) : m_prf(mac) {}
diff --git a/src/lib/kdf/sp800_56c/sp800_56c.cpp b/src/lib/kdf/sp800_56c/sp800_56c.cpp
index 664d32b30..338feba2a 100644
--- a/src/lib/kdf/sp800_56c/sp800_56c.cpp
+++ b/src/lib/kdf/sp800_56c/sp800_56c.cpp
@@ -27,17 +27,18 @@ SP800_56C* SP800_56C::make(const Spec& spec)
size_t SP800_56C::kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const
{
// Randomness Extraction
- secure_vector< byte > k_dk, context;
+ secure_vector< byte > k_dk;
m_prf->set_key(salt, salt_len);
m_prf->update(secret, secret_len);
m_prf->final(k_dk);
// Key Expansion
- m_exp->kdf(key, key_len, k_dk.data(), k_dk.size(), context.data(), context.size());
+ m_exp->kdf(key, key_len, k_dk.data(), k_dk.size(), nullptr, 0, label, label_len);
return key_len;
}
diff --git a/src/lib/kdf/sp800_56c/sp800_56c.h b/src/lib/kdf/sp800_56c/sp800_56c.h
index d1b6f39b5..1281ed314 100644
--- a/src/lib/kdf/sp800_56c/sp800_56c.h
+++ b/src/lib/kdf/sp800_56c/sp800_56c.h
@@ -23,9 +23,27 @@ class BOTAN_DLL SP800_56C : public KDF
KDF* clone() const override { return new SP800_56C(m_prf->clone(), m_exp->clone()); }
+ /**
+ * Derive a key using the SP800-56C KDF.
+ *
+ * The implementation hard codes the context value for the
+ * expansion step to the empty string.
+ *
+ * @param key derived keying material K_M
+ * @param key_len the desired output length in bytes
+ * @param secret shared secret Z
+ * @param secret_len size of Z in bytes
+ * @param salt salt s of the extraction step
+ * @param salt_len size of s in bytes
+ * @param label label for the expansion step
+ * @param label_len size of label in bytes
+ *
+ * @throws Invalid_Argument key_len > 2^32
+ */
size_t kdf(byte key[], size_t key_len,
const byte secret[], size_t secret_len,
- const byte salt[], size_t salt_len) const override;
+ const byte salt[], size_t salt_len,
+ const byte label[], size_t label_len) const override;
SP800_56C(MessageAuthenticationCode* mac, KDF* exp) : m_prf(mac), m_exp(exp) {}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 13:29:07 +0000