The CPU performance is a joke though.
c1 from instantcloud.io:
ubuntu@c1-10-1-33-39:~$ openssl speed rsa
Doing 512 bit private rsa's for 10s: 11119 512 bit private RSA's in 10.00s
Doing 512 bit public rsa's for 10s: 111478 512 bit public RSA's in 10.00s
Doing 1024 bit private rsa's for 10s: 1950 1024 bit private RSA's in 10.00s
Doing 1024 bit public rsa's for 10s: 34638 1024 bit public RSA's in 10.00s
Doing 2048 bit private rsa's for 10s: 291 2048 bit private RSA's in 10.01s
Doing 2048 bit public rsa's for 10s: 9393 2048 bit public RSA's in 10.00s
Doing 4096 bit private rsa's for 10s: 40 4096 bit private RSA's in 10.16s
Doing 4096 bit public rsa's for 10s: 2402 4096 bit public RSA's in 10.01s
OpenSSL 1.0.1f 6 Jan 2014
built on: Thu Oct 16 16:07:24 UTC 2014
options:bn(64,32) rc4(ptr,char) des(idx,cisc,16,long) aes(partial) blowfish(ptr)
compiler: cc -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -DTERMIO -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -Wl,-Bsymbolic-functions -Wl,-z,relro -Wa,--noexecstack -Wall -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DAES_ASM -DGHASH_ASM
sign verify sign/s verify/s
rsa 512 bits 0.000899s 0.000090s 1111.9 11147.8
rsa 1024 bits 0.005128s 0.000289s 195.0 3463.8
rsa 2048 bits 0.034399s 0.001065s 29.1 939.3
rsa 4096 bits 0.254000s 0.004167s 3.9 240.0
thresh@odroid:~$ openssl speed rsa
Doing 512 bit private rsa's for 10s: 19334 512 bit private RSA's in 9.99s
Doing 512 bit public rsa's for 10s: 204957 512 bit public RSA's in 9.97s
Doing 1024 bit private rsa's for 10s: 3490 1024 bit private RSA's in 10.00s
Doing 1024 bit public rsa's for 10s: 62453 1024 bit public RSA's in 10.00s
Doing 2048 bit private rsa's for 10s: 516 2048 bit private RSA's in 10.00s
Doing 2048 bit public rsa's for 10s: 17051 2048 bit public RSA's in 10.00s
Doing 4096 bit private rsa's for 10s: 72 4096 bit private RSA's in 10.09s
Doing 4096 bit public rsa's for 10s: 4434 4096 bit public RSA's in 10.00s
OpenSSL 1.0.1f 6 Jan 2014
built on: Fri Jun 20 19:00:28 UTC 2014
options:bn(64,32) rc4(ptr,char) des(idx,cisc,16,long) aes(partial) blowfish(ptr)
compiler: cc -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -DTERMIO -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -Wl,-Bsymbolic-functions -Wl,-z,relro -Wa,--noexecstack -Wall -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DAES_ASM -DGHASH_ASM
sign verify sign/s verify/s
rsa 512 bits 0.000517s 0.000049s 1935.3 20557.4
rsa 1024 bits 0.002865s 0.000160s 349.0 6245.3
rsa 2048 bits 0.019380s 0.000586s 51.6 1705.1
rsa 4096 bits 0.140139s 0.002255s 7.1 443.4
thresh@thre ~ $ openssl speed rsa
Doing 512 bit private rsa's for 10s: 119305 512 bit private RSA's in 9.81s
Doing 512 bit public rsa's for 10s: 1450435 512 bit public RSA's in 9.85s
Doing 1024 bit private rsa's for 10s: 35347 1024 bit private RSA's in 9.85s
Doing 1024 bit public rsa's for 10s: 541458 1024 bit public RSA's in 9.86s
Doing 2048 bit private rsa's for 10s: 5259 2048 bit private RSA's in 9.84s
Doing 2048 bit public rsa's for 10s: 161094 2048 bit public RSA's in 9.88s
Doing 4096 bit private rsa's for 10s: 627 4096 bit private RSA's in 9.81s
Doing 4096 bit public rsa's for 10s: 41353 4096 bit public RSA's in 9.75s
OpenSSL 1.0.1e 11 Feb 2013
built on: Thu Mar 19 18:31:36 UTC 2015
options:bn(64,64) rc4(16x,int) des(idx,cisc,16,int) aes(partial) blowfish(idx)
compiler: gcc -fPIC -DOPENSSL_PIC -DZLIB -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -m64 -DL_ENDIAN -DTERMIO -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -Wl,-z,relro -Wa,--noexecstack -Wall -DMD32_REG_T=int -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM
sign verify sign/s verify/s
rsa 512 bits 0.000082s 0.000007s 12161.6 147252.3
rsa 1024 bits 0.000279s 0.000018s 3588.5 54914.6
rsa 2048 bits 0.001871s 0.000061s 534.5 16305.1
rsa 4096 bits 0.015646s 0.000236s 63.9 4241.3
[ec2-user@ip-10-71-147-165 ~]$ openssl speed rsa
Doing 512 bit private rsa's for 10s: 85447 512 bit private RSA's in 9.48s
Doing 512 bit public rsa's for 10s: 123882 512 bit public RSA's in 9.96s
Doing 1024 bit private rsa's for 10s: 7720 1024 bit private RSA's in 9.98s
Doing 1024 bit public rsa's for 10s: 187876 1024 bit public RSA's in 10.04s
Doing 2048 bit private rsa's for 10s: 1268 2048 bit private RSA's in 9.99s
Doing 2048 bit public rsa's for 10s: 67337 2048 bit public RSA's in 10.07s
Doing 4096 bit private rsa's for 10s: 36 4096 bit private RSA's in 7.89s
Doing 4096 bit public rsa's for 10s: 25180 4096 bit public RSA's in 9.85s
OpenSSL 1.0.1g-fips 7 Apr 2014
built on: Wed Apr 9 21:51:31 UTC 2014
options:bn(64,64) md2(int) rc4(16x,int) des(idx,cisc,16,int) aes(partial) idea(int) blowfish(idx)
compiler: gcc -fPIC -DOPENSSL_PIC -DZLIB -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DKRB5_MIT -m64 -DL_ENDIAN -DTERMIO -Wall -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -Wa,--noexecstack -DPURIFY -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM
sign verify sign/s verify/s
rsa 512 bits 0.000111s 0.000080s 9013.4 12438.0
rsa 1024 bits 0.001293s 0.000053s 773.5 18712.7
rsa 2048 bits 0.007879s 0.000150s 126.9 6686.9
rsa 4096 bits 0.219167s 0.000391s 4.6 2556.3