The Ravens also announced that defensive end Arthur Jones signed his restricted free agent tender and that linebacker Albert McClellan signed an exclusive-rights free agent tender.
Huff, who was waived by the Oakland Raiders before the start of free agency, fills a position of need for the Ravens with starting safeties Ed Reed and Bernard Pollard gone from last season's Super Bowl-winning team.
Since free agency began, the Ravens have added Huff, Elvis Dumervil, Chris Canty and Marcus Spears to replace the departed Reed, Pollard, Paul Kruger, Ray Lewis, Dannell Ellerbe and Cary Williams.
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Washington Redskins quarterback Robert Griffin III is progressing in his recovery from knee surgery and hopes to return for the opening game of the season.
However, Griffin cautioned in a statement to ESPN that he won't play until he's healthy.
"My knee is getting better every day. The doctors say I'm ahead of schedule. My goal is to return healthy in Week 1, but if I'm not ready then I will wait until I am, however long that is," he wrote.
"My first NFL season and my injury that ended it showed me a lot about the league, my team and myself.
"I know where my responsibility is within the dilemma that led to me having surgery to repair my knee and all parties involved know their responsibilities as well. I'm looking forward to playing the game we all love so much again and not behind at the negative."
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The San Diego Chargers released offensive tackle Jared Gaither, costing the team $6 million against the 2013 salary cap.
The move was not a surprise. Gaither was injured and limited to four games last season. He was placed on injured reserve Nov.
23 with a groin injury and also missed most of training camp the first three regular-season games with a back issue.
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Defensive lineman Tommy Kelly, who signed a seven-year, $50.1 million contract in 2008, will be released by the Raiders.
Kelly, scheduled to earn $6.5 million in 2013, played nine seasons for Oakland.
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The Dallas Cowboys are close to signing former Detroit Lions linebacker Justin Durant and former Pittsburgh Steelers safety Will Allen, NFL.com reported.
To bring in the two players, the Cowboys will have to restructure salaries to clear the necessary cap space. In addition, the team will cut a player to free up money for Durant and Allen, according to the Fort Worth Star-Telegram.
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The Carolina Panthers have re-signed unrestricted free agent defensive tackle Dwan Edwards.
Edwards is coming off a 2012 season in which he posted a career-high six sacks, ranking third among players at his position in the NFL. He started 14 games, missing two because of a wrist injury.
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Free agent linebacker Chase Blackburn has announced on Twitter that he will sign with the Carolina Panthers, filling a vacancy after James Anderson signed a free agent deal with the Chicago Bears.
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New England Patriots tight end Rob Gronkowski underwent surgery in February for an infection in the arm that was broken twice this past season, he has confirmed.
Gronkowski told ESPN Radio that he's well down the road in his rehab.
"Just rehabbing, getting the muscle stronger around it. You want to get everything activated, re-activated, because it shuts down for a little bit when it's healing," he said.