It would certainly make headlines if such information were made available, and some history books might have to be changed, but here is what I read in "The House on Garibaldi Street":
Dramatis Personae
1. The Start of Operation Eichmann
(...)
Dr. FRITZ BAUER - Public Prosecutor of the Province of Hesse in West Germany, who, by means of Dr. Shinar, passed on the information about Eichmann's presence in Argentina to the Israeli authorities."
and on page 4:
'Eichmann has been traced,' began Bauer without any preliminaries.
'Adolf Eichmann?' exclaimed Shinar excitedly.
'Yes, Adolf Eichmann. He is in Argentina.'
'And what do you intend to do?'
'I'll be perfectly frank with you,' said Bauer. '
I don't know if we can altogether rely on the German judiciary here, let alone on the German embassy staff in Buenos Aires. That is why I was so interested in talking to you. I see no other way but to turn to you. You are known to be efficient people, and nobody could be more interested than you in the capture of Eichmann. Obviously, I wish to maintain contact with you in connection with this matter, but only provided strict secrecy is kept.'
http://www.amazon.com/House-Garibaldi-Street-Classics-Espionage/dp/0714647543#reader_0714647543 In the introduction to the 1997 edition, Shlomo Shapiro writes
"Previous editions described the source of the information as Dr. Fritz Bauer, a Jewish lawyer who held the position of state district attorney in the German state of Hessen. It was assumed that Bauer provided the information on his own personal initiative.
Harel reveals for the first time that the prime minister of Hessen at the time, Georg-August Zinn, a leading figure in Germany's Social-Democratic Party (SPD), had approved of the transfer of the information and was kept informed of Bauer's contacts with the Mossad."
Which is not all that surprising since Zinn got Bauer the job as attorney general in the first place and, while not really a leading figure on the national level - the SPD was maligned up until the seventies by those conservatives who had previously been Nazis as the party of the "Vaterlandsverräter" (traitors to the homeland) and was indeed led by former emigrants - Zinn had a reputation of a good old-fashioned Social Democrat and anti-fascist. Interesting indeed that he would agree to tipping off the Israelis instead of seeking extradition! He had nothing to do with the conservative Federal Government and the BND, both infiltrated by former Nazis as was commonly known.