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  • openssl/lib/openssl/hmac.rb
  • openssl/ossl.c

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OpenSSL::HMAC

OpenSSL::HMAC allows computing Hash-based Message Authentication Code (HMAC). It is a type of message authentication code (MAC) involving a hash function in combination with a key. HMAC can be used to verify the integrity of a message as well as the authenticity.

OpenSSL::HMAC has a similar interface to OpenSSL::Digest.

HMAC-SHA256 using one-shot interface ↑

key = "key"
data = "message-to-be-authenticated"
mac = OpenSSL::HMAC.hexdigest("SHA256", key, data)
#=> "cddb0db23f469c8bf072b21fd837149bd6ace9ab771cceef14c9e517cc93282e"

HMAC-SHA256 using incremental interface ↑

data1 = File.binread("file1")
data2 = File.binread("file2")
key = "key"
hmac = OpenSSL::HMAC.new(key, 'SHA256')
hmac << data1
hmac << data2
mac = hmac.digest

Public Class Methods

base64digest(digest, key, data) → aString click to toggle source

Returns the authentication code as a Base64-encoded string. The digest parameter specifies the digest algorithm to use. This may be a String representing the algorithm name or an instance of OpenSSL::Digest.

Example ↑

key = 'key'
data = 'The quick brown fox jumps over the lazy dog'

hmac = OpenSSL::HMAC.base64digest('SHA1', key, data)
#=> "3nybhbi3iqa8ino29wqQcBydtNk="

 
               # File openssl/lib/openssl/hmac.rb, line 72
def base64digest(digest, key, data)
  [digest(digest, key, data)].pack("m0")
end
digest(digest, key, data) → aString click to toggle source

Returns the authentication code as a binary string. The digest parameter specifies the digest algorithm to use. This may be a String representing the algorithm name or an instance of OpenSSL::Digest.

Example ↑

key = 'key'
data = 'The quick brown fox jumps over the lazy dog'

hmac = OpenSSL::HMAC.digest('SHA1', key, data)
#=> "\xDE|\x9B\x85\xB8\xB7\x8A\xA6\xBC\x8Az6\xF7\n\x90p\x1C\x9D\xB4\xD9"

 
               # File openssl/lib/openssl/hmac.rb, line 34
def digest(digest, key, data)
  hmac = new(key, digest)
  hmac << data
  hmac.digest
end
hexdigest(digest, key, data) → aString click to toggle source

Returns the authentication code as a hex-encoded string. The digest parameter specifies the digest algorithm to use. This may be a String representing the algorithm name or an instance of OpenSSL::Digest.

Example ↑

key = 'key'
data = 'The quick brown fox jumps over the lazy dog'

hmac = OpenSSL::HMAC.hexdigest('SHA1', key, data)
#=> "de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9"

 
               # File openssl/lib/openssl/hmac.rb, line 53
def hexdigest(digest, key, data)
  hmac = new(key, digest)
  hmac << data
  hmac.hexdigest
end
new(key, digest) → hmac click to toggle source

Returns an instance of OpenSSL::HMAC set with the key and digest algorithm to be used. The instance represents the initial state of the message authentication code before any data has been processed. To process data with it, use the instance method update with your data as an argument.

Example ↑

key = 'key'
instance = OpenSSL::HMAC.new(key, 'SHA1')
#=> f42bb0eeb018ebbd4597ae7213711ec60760843f
instance.class
#=> OpenSSL::HMAC

A note about comparisons ↑

Two instances can be securely compared with #== in constant time:

    other_instance = OpenSSL::HMAC.new('key', 'SHA1')
#=> f42bb0eeb018ebbd4597ae7213711ec60760843f
instance == other_instance
#=> true

 
               static VALUE
ossl_hmac_initialize(VALUE self, VALUE key, VALUE digest)
{
    EVP_MD_CTX *ctx;
    EVP_PKEY *pkey;

    GetHMAC(self, ctx);
    StringValue(key);
    pkey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
                                (unsigned char *)RSTRING_PTR(key),
                                RSTRING_LENINT(key));
    if (!pkey)
        ossl_raise(eHMACError, "EVP_PKEY_new_mac_key");
    if (EVP_DigestSignInit(ctx, NULL, ossl_evp_get_digestbyname(digest),
                           NULL, pkey) != 1) {
        EVP_PKEY_free(pkey);
        ossl_raise(eHMACError, "EVP_DigestSignInit");
    }
    /* Decrement reference counter; EVP_MD_CTX still keeps it */
    EVP_PKEY_free(pkey);

    return self;
}

Public Instance Methods

<<(p1) click to toggle source
Alias for: update
==(other) click to toggle source

Securely compare with another HMAC instance in constant time.

 
               # File openssl/lib/openssl/hmac.rb, line 5
def ==(other)
  return false unless HMAC === other
  return false unless self.digest.bytesize == other.digest.bytesize

  OpenSSL.fixed_length_secure_compare(self.digest, other.digest)
end
base64digest → string click to toggle source

Returns the authentication code an a Base64-encoded string.

 
               # File openssl/lib/openssl/hmac.rb, line 16
def base64digest
  [digest].pack("m0")
end
digest → string click to toggle source

Returns the authentication code an instance represents as a binary string.

Example ↑

instance = OpenSSL::HMAC.new('key', 'SHA1')
#=> f42bb0eeb018ebbd4597ae7213711ec60760843f
instance.digest
#=> "\xF4+\xB0\xEE\xB0\x18\xEB\xBDE\x97\xAEr\x13q\x1E\xC6\a`\x84?"

 
               static VALUE
ossl_hmac_digest(VALUE self)
{
    EVP_MD_CTX *ctx;
    size_t buf_len = EVP_MAX_MD_SIZE;
    VALUE ret;

    GetHMAC(self, ctx);
    ret = rb_str_new(NULL, EVP_MAX_MD_SIZE);
    if (EVP_DigestSignFinal(ctx, (unsigned char *)RSTRING_PTR(ret),
                            &buf_len) != 1)
        ossl_raise(eHMACError, "EVP_DigestSignFinal");
    rb_str_set_len(ret, (long)buf_len);

    return ret;
}
hexdigest → string click to toggle source

Returns the authentication code an instance represents as a hex-encoded string.

 
               static VALUE
ossl_hmac_hexdigest(VALUE self)
{
    EVP_MD_CTX *ctx;
    unsigned char buf[EVP_MAX_MD_SIZE];
    size_t buf_len = EVP_MAX_MD_SIZE;
    VALUE ret;

    GetHMAC(self, ctx);
    if (EVP_DigestSignFinal(ctx, buf, &buf_len) != 1)
        ossl_raise(eHMACError, "EVP_DigestSignFinal");
    ret = rb_str_new(NULL, buf_len * 2);
    ossl_bin2hex(buf, RSTRING_PTR(ret), buf_len);

    return ret;
}
Also aliased as: inspect, to_s
initialize_copy(p1) click to toggle source 
 
               static VALUE
ossl_hmac_copy(VALUE self, VALUE other)
{
    EVP_MD_CTX *ctx1, *ctx2;

    rb_check_frozen(self);
    if (self == other) return self;

    GetHMAC(self, ctx1);
    GetHMAC(other, ctx2);
    if (EVP_MD_CTX_copy(ctx1, ctx2) != 1)
        ossl_raise(eHMACError, "EVP_MD_CTX_copy");
    return self;
}
inspect() click to toggle source
Alias for: hexdigest
reset → self click to toggle source

Returns hmac as it was when it was first initialized, with all processed data cleared from it.

Example ↑

data = "The quick brown fox jumps over the lazy dog"
instance = OpenSSL::HMAC.new('key', 'SHA1')
#=> f42bb0eeb018ebbd4597ae7213711ec60760843f

instance.update(data)
#=> de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9
instance.reset
#=> f42bb0eeb018ebbd4597ae7213711ec60760843f

 
               static VALUE
ossl_hmac_reset(VALUE self)
{
    EVP_MD_CTX *ctx;
    EVP_PKEY *pkey;

    GetHMAC(self, ctx);
    pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
    if (EVP_DigestSignInit(ctx, NULL, EVP_MD_CTX_get0_md(ctx), NULL, pkey) != 1)
        ossl_raise(eHMACError, "EVP_DigestSignInit");

    return self;
}
to_s() click to toggle source
Alias for: hexdigest
update(string) → self click to toggle source

Returns hmac updated with the message to be authenticated. Can be called repeatedly with chunks of the message.

Example ↑

first_chunk = 'The quick brown fox jumps '
second_chunk = 'over the lazy dog'

instance.update(first_chunk)
#=> 5b9a8038a65d571076d97fe783989e52278a492a
instance.update(second_chunk)
#=> de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9

 
               static VALUE
ossl_hmac_update(VALUE self, VALUE data)
{
    EVP_MD_CTX *ctx;

    StringValue(data);
    GetHMAC(self, ctx);
    if (EVP_DigestSignUpdate(ctx, RSTRING_PTR(data), RSTRING_LEN(data)) != 1)
        ossl_raise(eHMACError, "EVP_DigestSignUpdate");

    return self;
}
Also aliased as: <<
There is an updated format of the API docs for this version here.