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  &lt;div class="code"&gt;&lt;pre class="txt"&gt;...&#13;
&#13;
typedef enum&#13;
  {&#13;
    DIGEST_ALGO_MD5         =  1,&#13;
    DIGEST_ALGO_SHA1        =  2,&#13;
    DIGEST_ALGO_RMD160      =  3,&#13;
    /* 4, 5, 6, and 7 are reserved. */&#13;
    DIGEST_ALGO_SHA256      =  8,&#13;
    DIGEST_ALGO_SHA384      =  9,&#13;
    DIGEST_ALGO_SHA512      = 10,&#13;
    DIGEST_ALGO_SHA224      = 11&#13;
  }&#13;
digest_algo_t;&#13;
&#13;
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  &lt;div class="code"&gt;&lt;pre class="txt"&gt;$ echo foo | gpg --detach-sign --armor | LC_ALL=C gpg --list-packets --verbose&#13;
&#13;
gpg: armor header: Version: GnuPG v1&#13;
:signature packet: algo 17, keyid 14C85A0824EAF823&#13;
	version 4, created 1440053810, md5len 0, sigclass 0x00&#13;
	digest algo 2, begin of digest 59 54&#13;
	hashed subpkt 2 len 4 (sig created 2015-08-20)&#13;
	subpkt 16 len 8 (issuer key ID 14C85A0824EAF823)&#13;
	data: [160 bits]&#13;
	data: [158 bits]&#13;
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